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KING-NYGREN, ELIAS. "Analysis of Complex 3D-Concrete Casting." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299789.
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Concrete is the second most used material in the world and is primarily used within the construction industry. It is however also used for making decorative and functional smaller products within various industries. Manufacturing with concrete can be done with different manufacturing techniques, the most common technique being concrete casting in molds. This project was conducted at Arclight AB in Stockholm, a company on the verge of starting production of molds for casting concrete products. With many different manufacturing techniques at their disposal, it is however difficult for them to know which manufacturing technique should be used for which type of mold. The goal of this project is to compare the available manufacturing techniques at Arclight and see which are most suitable for mold manufacturing. The background research and preparation resulted in three segments of the casting process which needed to be analyzed: choice of concrete, choice post-processing technique, and choice of manufacturing technique. Results from the trails of these three segments gave invaluable information for the project. Concrete trails resulted in a recommendation of a concrete with high compression strength and high water content to make the concrete viscous and flow easily into the mold. Post-processing trials resulted in different optimal post-processing techniques based on the mold material and manufacturing technique. Manufacturing trails gave in-depth information on processing larger molds and the potential problems associated with casting complex large concrete products. The final result of the project is a spreadsheet which recommends an optimal manufacturing technique based on the geometry type and number of products to be cast. Maximum cost per product, maximum machine time for manufacturing and maximum total production time for the concrete products are also stated to find the optimal manufacturing technique for each specific concrete casting project. Before using this spreadsheet as a basis for manufacturing, it should be formatted for easier use. Additional tests with applying epoxy and polyurethane resin for post-processing molds should be conducted, in addition to testing materials for manufacture of master molds for vacuum forming.Betong är det näst mest använda råmaterialet i världen och används primärt inom byggindustrin. Det används även för tillverkning av estetiska och funktionella mindre produkter inom andra industrier. Betongprodukter kan tillverkas med flera olika tillverkningstekniker, där den vanligaste är gjutning av betong i gjutformar. Detta projekt var utfört hos Arclight AB i Stockholm, ett företag som är i början av att starta produktion av gjutformar för gjutning av betongprodukter. Med så många olika tillverkningstekniker hos företaget är det svårt att veta vilken tillverkningsteknik som är bäst lämpad för vilken typ av gjutform. Målet med detta projekt är att jämföra de olika tillverkningstekniker Arclight har och se vilka är mest lämpade för tillverkning av gjutformar. Bakgrundsforskningen och förberedandet resulterade i tre segment av gjutprocessen som behövde analyseras; val av betong, val av ytbehandlingsteknik, och val av tillverkningsteknik. Testerna inom dessa tre segment gav ovärderlig information för projektet. Resultatet av betongtesterna var en rekommendation av betong med hög tryckhållfasthet och en stor mängd vatten i betongen för lättare hällning i gjutformen. Resultatet av ytbehandlingstesterna var olika optimala ytbehandlingar beroende på material för gjutformen, samt tillverkningsteknik. Resultatet av tillverkningstesterna gav information om stora gjutformar bäst hanteras och eventuella problem associerade med att gjuta stora komplexa betongprodukter. Slutgiltiga resultatet av projektet är ett kalkylblad vilket rekommenderar optimala tillverkningsmetoden baserat på geometritypen av produkten som ska gjutas samt antalet produkter att tillverka. Maximal kostnad per produkt, maximal maskintid för tillverkning och maximal total tillverkningstid för produktion av betongprodukterna bestäms även för att finna optimala tillverkningstekniken för varje specifikt betonggjutningsprojekt. Innan detta kalkylark används för tillverkning borde det formateras så det är mer användarvänligt. Ytterligare ytbehandlingstester med epoxyresin och polyuretanresin bör göras på gjutformar, samt även att testa material för tillverkning av formverktyg för vakumforming.
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Howard, Marvin ElRoy. "Sailing up Olympus casting a critical eye on Educational Technology /." [Ames, Iowa : Iowa State University], 2007.
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Cheng, Xu. "Inert refractory systems for casting of titanium alloys." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3838/.
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Research has been undertaken to develop new yttria slurry systems for use in mould face coats for investment casting TiAl alloy, solving the pre-gelation problems of commercial yttria slurry systems to increase slurry life. Meanwhile, the new face coats should also have excellent sintering properties, chemical inertness, surface finish and be easy to prepare. The processes of developing the new slurry started with the filler powder investigation by adding different sintering additives into the yttria powder to achieve good sintering properties. Then the best filler powder candidates were selected to make the slurry. Finally, the new face coat slurries were used to make the shell face coat and the chemical inertness of those shells were investigated through the sessile drop and investment casting. In the research, the filler powder and face coat sintering properties were quantified through density, dilatometer testing, X-ray diffraction (XRD) and microstructural change at different testing temperatures. The interaction of different face coat systems and the metal were identified using hardness tests, sessile drop contact angle and the microstructural change at the metal/shell interface. In this research, three water-based binder face coat systems containing YF\(_3\), Y\(_2\)O\(_3\)+0.5wt% Al\(_2\)O\(_3\)+ 0.5 wt% ZrO\(_2\) (YAZ), and B\(_2\)O\(_3\) additives were found to have similar or even better sintering properties compared to a commercial face coat. Meanwhile, they had long life.
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Weller, Martin L. "An analysis of the applicability of rule based technology to a representative domain." Thesis, Teesside University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387023.
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Du, Preez W., A. Paine, and R. Bean. "Product development within the framework of a National Casting Technology Centre." Journal for New Generation Sciences, Vol 4, Issue 1: Central University of Technology, Free State, Bloemfontein, 2006. http://hdl.handle.net/11462/488.
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Published ArticleThe need for a state of the art advanced National Casting Technology Centre (NCTC) has been widely supported throughout industry and recognised as an important facilitator in the growth of the foundry industry. This initiative also aligns itself with the government's Advanced Manufacturing Technology Strategy (AMTS), which is an implementation strategy in support of the South African government's Integrated Manufacturing Strategy (IMS) and National R&D Strategy (NRDS). The AMTS aims at supporting and developing the downstream high technology manufacturing industry, inter alia through the aerospace, automotive and metals sectors.
In light of the above and in an effort to retain and expand the current national skills, expertise and facilities in advanced casting technologies, the National Product Development Centre at the CSIR has initiated a process of establishing a National Casting Technology Centre (NCTC). The establishment of the NCTC provides a supportive technology platform for the Advanced Metals Initiative (AMI), which was launched in 2003.
The primary objective of the NCTC is to preserve and expand the national expertise and capabilities in cast metals manufacturing by supporting the local casting industry with process development, technology transfer and skills enhancement in order to increase their global competitiveness.
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Taylor, Benjamin Luke. "Reaction systems and phase development for investment casting ceramics." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5932/.
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Aero engine turbine blades are commonly produced via investment casting methods utilising sacrificial ceramic cores during casting to provide internal features such as cooling channels. During the firing process the conversion of the main ingredient (amorphous silica) to β-cristobalite plays a significant role, as it directly affects the dimensional stability, shrinkage, and leachability of the core after casting. Dilatometry, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilised to evaluate common additives such as zirconium silicate and aluminosilicate. Zircon was found to act as a nucleation site with high temperature stability while aluminosilicate acts as a flux enhancing cristobalite formation rates. This understanding was utilised to mimic the performance of the formulation using both a novel engineered material and alternative naturally sourced silica. An innovative method was also developed utilising confocal Raman spectroscopy (CRM) and polarised light microscopy (PLM) for analysis of ceramic systems studied with a hot stage up to 1500 °C. Polarised light microscopy was shown to be favourable for analysis of crystal growth mechanisms and low temperature (≈250 °C) α-β cristobalite phase transitions. Developments in Raman spectroscopic technique enabled the location and crystallinity of devitrified amorphous silica (cristobalite) to be observed via a quasi-real time method, providing insight to the source, direction and corresponding crystal growth rates. The combination of analytical techniques has provided sufficient understanding to explain the role of key components in ceramic core formulations, which can be used to improve control and the predictability of the system during development and manufacture.
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Bednárik, Marko. "Návrh změny výroby tvářené součásti na technologii lití do keramických skořepin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445164.
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This diploma thesis describes the process of production of the cast by the lost-wax casting method. It includes the manufacturing of prototype models by additive technology, creation of ceramic shell molds. The work also includes an experimental part focused on the production of the selected parts by the method of the lost-wax casting and the comparison of this method with other types of production.
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Tarrant, Luke. "Formulation and development of ceramic mould materials for investment casting." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3399/.
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The relationship between the formulation of ceramic mould materials for investment casting and their mechanical properties was investigated. A number of different ceramic materials were employed throughout the investigation including alumina, zirconia, mullite and colloidal silica. Ceramic shell specimens were investigated by measuring mechanical strength using flexural and compressive testing with the former being conducted at both room and elevated temperatures. Samples were further investigated by thermal expansion measurement and Archimedes porosity measurement. It was determined that the incorporation of unstabilised zirconia as both a stucco and filler material was effective in terms of reducing the fired strength of investment casting ceramics. Structural observations of samples under SEM revealed that the weakened samples featured significant cracking in the fired condition due to the occurrence of the zirconia phase transition. Thermal expansion measurements confirmed both the presence of the phase transition and the extent of the disruption caused. It was observed for slurries containing silica and alumina, that variation of the proportions of either had a significant effect on the properties of the final shell material. It was also shown that the size of the ceramic particles within the slurry had a significant effect on the final properties of the ceramic body.
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Demirel, Onur. "Development Of Automobile Chassis Parts Via Aluminum Extrusion And Sand Casting Technology." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614965/index.pdf.
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Due to the environmental issues related with fuel consumption and additionally passenger safety, aluminum space frame chassis is promising a big opportunity to design a lightweight structure with a high stiffness. Despite the lower stiffness and strength of aluminum in comparison to the conventional steel chassis, it can be compensated with changing thickness and design of structure by space frame geometry In this study, instead of using steel for automobile chassis, main goal is producing a space frame structure with using aluminum in an extrusion and sand casting processes and improve the stiffness. Chassis is designed according to calculations for moment of inertia, torsional and bending stiffness and in sufficient structural stiffness which can compete with steel chassis. Static finite element analysis was carried out to understand the chassis bending, torsional stiffness and fatigue behaviors. For frontal collisions, dynamic finite element analysis was also done to determine increases in the energy absorbance, specific energy absorbance and peak force for passenger safety. Aluminum profiles were produced by hot extrusion and joined with sand casting parts by TIG welding to manufacture a space frame structure. For main chassis profile, 6063 series of aluminum alloy was selected due to availability for extrusion process, weldability and having sufficient tensile strength and percent elongation and treatment response. Three point bending test was carried out to determine flexural strength. Moment of inertia calculations were done. Some parts such as side frame and shock absorber tower were produced by sand casting method. A similar composition to Silafont &ndash36 aluminum alloy was selected because of its high fluidity and good mechanical properties
despite it is a die cast alloy. Tensile, hardness and Charpy impact test were conducted to determine the mechanical characteristics of Silafont - 36 sand cast alloy. In addition to microstructure features and thermal analysis were also carried out to achieve sufficient alloy properties. Heat affected z one was investigated by hardness and tensile test to determine the mechanical properties change after welding process. In this space frame development study, A, B and C pillar parts were produced by Al &ndash
Si sand casting and T6 heat treatment then welded together by TIG welding and finally assembled on the bottom chassis frame produced by using 6063 extrudes welded by 4000 series electrodes. The space frame chassis was studied by also computer simulation to test and see critical points which must be modified during manufacturing. Besides the experimental and theoretical studies, space frame was also produced at the same time. According to the experimental results, the feasibility of the production of lightweight and solid chassis structure was achieved.
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Elalem, Kaled. "Application of heat pipe technology in permanent mold casting of nonferrous alloys." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85067.
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The issue of mold cooling is one, which presents a foundry with a dilemma. On the one hand; the use of air for cooling is safe and practical, however, it is not very effective and high cost. On the other hand, water-cooling can be very effective but it raises serious concerns about safety, especially with a metal such as magnesium. An alternative option that is being developed at McGill University uses heat pipe technology to carry out the cooling.The experimental program consisted of designing a permanent mold to produce AZ91E magnesium alloy and A356 aluminum alloy castings with shrinkage defects. Heat pipes were then used to reduce these defects. The heat pipes used in this work are novel and are patent pending. They are referred to as McGill Heat Pipes.
Computer modeling was used extensively in designing the mold and the heat pipes. Final designs for the mold and the heat pipes were chosen based on the modeling results.
Laboratory tests of the heat pipe were performed before conducting the actual experimental plan. The laboratory testing results verified the excellent performance of the heat pipes as anticipated by the model.
An industrial mold made of H13 tool steel was constructed to cast nonferrous alloys. The heat pipes were installed and initial testing and actual industrial trials were conducted. This is the first time where a McGill heat pipe was used in an industrial permanent mold casting process for nonferrous alloys.
The effects of cooling using heat pipes on AZ91E and A356 were evaluated using computer modeling and experimental trials. Microstructural analyses were conducted to measure the secondary dendrite arm spacing, SDAS, and the grain size to evaluate the cooling effects on the castings. The modeling and the experimental results agreed quite well. The metallurgical differences between AZ91E and A356 were investigated using modeling and experimental results. Selected results from modeling, laboratory and industrial trials are presented. The results show a promising future for heat pipe technology in cooling permanent molds for the casting of nonferrous alloys.
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Sacharuk, Jasmine. "Late Shang (1200 BCE - 1046 BCE) bronze casting technology and technological behaviour." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50036.
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This project examines the bronze casting technology of the late Shang Dynasty (1200-1046 BCE). Despite extensive scholarship on the bronzes themselves, the details of the casting process have remained unclear. Considering the relevance of the bronzes in terms of ritual and burial practices, class hierarchy, and royal affiliation, understanding the production behind the bronzes can reveal a great deal about the lives of everyday Shang craftspeople and Shang society as a whole.
This project examines bronze foundry remains from Yinxu, the ruins of the last capital of the Shang Dynasty, in an attempt to uncover more information about the late Shang bronze casting process. Emphasizing the behavioural nature of technology, and the information embedded within technological action, this project undertakes replication experiments to explore how the physical properties of the materials directly influenced the behavioural nature of the bronze casting process.
Scanning electron microscopy (SEM) suggests that the loess used to create bronze molds was processed differently than in other ceramics, with a notably reduced amount of clay. This information is integrated with an experimental program, which concludes that the removal of clay fundamentally facilitates the bronze casting process by minimizing shrinkage, providing structural stability and enabling long-term decoration. This has implications on the labour of the bronze-casting industry, emphasizing an initial process (the removal of clay) in order to facilitate mold construction, decoration and casting at later stages. Examining the ways in which technologies are developed and used, and for what purposes, is a way in which archaeologists can examine past behaviour on both a personal and societal scale. The integration of petrographic analyses with an experimental program highlights how specific behaviours in the late Shang, such as materials processing and labour organization, are reflected in the technological remains of bronze casting. This project concludes that further examination into late Shang bronze casting technology is necessary in order to understand such a politically, socially and spiritually significant industry of the time, offering insight into the daily perspectives of the Shang people due to the inherently behavioural nature of technology.Arts, Faculty of
Anthropology, Department of
Graduate
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Lee, Kevin. "Understanding shell cracking during de-wax process in investment casting." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6783/.
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In investment casting, the removal of wax from the shell is a critical step which may cause shell failure. It would be advantageous to predict the stress development during de-waxing process with computer simulation. The process was simulated with the consideration of two aspects: (i) The thermo-physical data required to model the shell and wax behaviour in the autoclave environment and (ii) A simulation capable of capturing the interaction between shell, wax and the autoclave environment. Data on mechanical properties, thermal properties, permeability, rheology, thermal expansion and density was gathered for wax and shell as appropriate. Flow-3D was used to simulate the de-wax process such that the shell and wax can be simultaneously modelled. It was shown that the Von misses stress exceeded the expected critical failure stress at certain nodes after steam was introduced to the system. Waxes with higher viscosity were predicted to reach the critical stress sooner. The simulation showed that for the selected drainage orifice sizes that was no or little difference in the time taken to reach the critical stress. Wax compressibility which was considered to represent shell permeability was predicted to have a large effect on shell cracking prediction. In general, the statistics of failure in validation test limited the conclusions that could be drawn. Waxes predicted to show differences in cracking and drainage with increasing orifice size did so in the experiment. The simulated drainage times were greater than determined experimentally by around 380s and this requires further investigation.
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Wang, Quanyu. "Metalworking technology and deterioration of Jin bronzes from the Tianma-Qucun site, Shanxi, China." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368891.
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Lu, Hao [Verfasser]. "Development of the thin shell casting technology for downwards directional solidification / Hao Lu." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1037015207/34.
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Liu, Gang. "Fabrication of porous ceramics and composites by a novel freeze casting process." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1532/.
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Porous ceramics have been widely used in many fields. Among the fabrication techniques for porous ceramic, freeze casting has recently attracted much attention as being a versatile, low cost and environmental friendly process. In this study, alumina and Al\(_2\)O\(_3\)-ZrO\(_2\) were utilized as model materials to investigate the preparation technique of freeze casting. Basic factors such as initial solids loading, cooling rate, and sintering temperature that would affect the final morphologies and the effect of additives have been studied. Porous alumina ceramics with lamellar microstructure exhibited compressive strengths up to 123 MPa for 33% porosity and 55 MPa for 42% porosity, making them suitable to be considered for potential load-bearing applications. In a two-phase system (Al\(_2\)O\(_3\)-ZrO\(_2\)), the choice of particle size of the ceramic powder was of great significance, which can lead to engulfment and phase segregation. BaTiO\(_3\) and Lead zirconate titanate (PZT) were employed to demonstrate the application of the freeze casting technique. BaTiO\(_3\)-epoxy composites exhibited modest piezoelectric constant but the dielectric constant was 1 order of magnitude higher than conventional composites with randomly distributed ceramic particles. For the 2-2 PZT-epoxy composites, with an increase of initial solids loading from 11 vol.% to 25 vol.%, the volume of ceramic phase in the composite gradually increased from about 30 vol.% to 50 vol.%, the piezoelectric constant \(d_{33}\) increased from about 103 pC/N to 203 pC/N, demonstrating the potential applications of this technique for the fabrication of 2-2 piezocomposites.
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Reddy, Mahender Palvai. "Finite element simulation of three-dimensional casting, extrusion and forming processes." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135311/.
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liu, feng. "Optimized Design of Gating/Riser System in Casting Based on CAD and Simulation Technology." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-theses/130.
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Casting as a manufacturing process to make complex shapes of metal materials in mass production may experience many different defects such as porosity and incomplete filling. How to improve the casting quality becomes important. Gating/riser system design is critical to improving casting quality. The objective of the research presented in this thesis is to optimize gating/riser systems based on CAD and simulation technology with the goal of improving casting quality such as reducing incomplete filling area, decreasing large porosity and increasing yield. Therefore in the thesis, an optimization framework is presented based on CAD and simulation technology. Given a CAD model of part design and after converted to a casting model, it is the first step to evaluate castability of the casting design. Then the runner and risers are represented parametrically, and CAD models generated by varying parameters can be used in the simulation. After analyzing simulation results, the gating/riser system design is optimized to improve casting quality. In the thesis, one engine block is used to verify the effectiveness of the optimization method. Compared with the initial design, it is found that the optimized casting design can decrease porosity around 18% while the yield increases 16%.
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Cao, Bin. "On-line ultrasonic monitoring of injection molding and die casting processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ44084.pdf.
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Solanki, Riten. "Formulation of zircon-free slurries and the development of ceramic shell moulds for investment casting." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8078/.
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Ceramic slurries for investment casting with the potential to replace the use of zirconium silicate have been investigated. Alumina, aluminoslicates, mullite, zirconia-mullite and zircon refractory materials were characterised and paired with colloidal silica to evaluate their slurry properties. It was found that the particle size distribution of the filler affected the viscosity of the slurries under a shear rate of drainage. A larger proportion of fines in the filler were shown to form slurries with a longer draining time. This was found to impact the shell thermo-mechanical properties by influencing the type of siloxane network formed and the rate of sintering. A combination of synthetic fused mullite and alumina fillers with different ratios was evaluated. It was shown that the shell mechanical properties at cast temperatures could be altered by adjusting the proportion of alumina present, which influenced the extent of reaction sintering occurring. The compatibility of colloidal silica types with mullite and alumina fillers were assessed to determine the stability of slurries. An optimised slurry formulation that substitutes zirconium silicate with synthetic refractories was developed; with long slurry stability and the ability to tailor the shell strength at cast temperatures, through changing the filler ratio. Casting of turbine blades was performed with the optimised shell system and found to give satisfactory casting performance for the number of trials undertaken.
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Miklin, Anton. "Entwicklung einer Fertigungstechnologie für dünnwandigen Stahlguss." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-38945.
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Im Rahmen der Dissertation wurde eine Fertigungstechnologie entwickelt, die die Überleitung des Stahlniederdruckgießverfahrens (3CAST) in die Produktion und somit die Erzeugung des dünnwandigen Stahlgusses ermöglicht.
Die konventionellen Stahlgusswerkstoffe sowie ihre Gießbarkeit und Wärmebehandlung wurden untersucht und an die Besonderheiten des neuen Verfahrens und dünnwandigen Stahlgusses angepasst. Auf der Basis von schon existierenden Gießtechnologien wurde eine Formträgertechnologie (FTTech) entwickelt, die unter Berücksichtigung ökologischer Aspekte eine hohe Gussteilqualität und Wirtschaftlichkeit des Gießverfahrens sichert.
Die gewonnen Ergebnisse wurden anhand eines Formträgerprototyps unter produktionsnahen Bedingungen erfolgreich erprobt. Somit ist eine Grundlage für den bei der Fa. Evosteel GmbH geplanten Aufbau der Fertigungstechnologie zur Serienproduktion von komplexen dünnwandigen Stahlgussteilen geschaffen.
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Nyembwe, Kasongo Didier. "Tool manufacturing by metal casting in sand moulds produced by additive manufacturing processes." Thesis, Bloemfontein : Central University of Technology, Free State, 2012. http://hdl.handle.net/11462/162.
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Thesis (D. Tech. ( Mechanical Engineering )) - Central University of technology, Free State, 2012In this study an alternative indirect Rapid Tooling process is proposed. It essentially consists of producing sand moulds by Additive Manufacturing (AM) processes followed by casting of tools in the moulds. Various features of this tool making method have been investigated. A process chain for the proposed tool manufacturing method was conceptually developed. This process chain referred to as Rapid Casting for Tooling (RCT) is made up of five steps including Computer Aided Design (CAD) modeling, casting simulation, AM of moulds, metal casting and finishing operations. A validation stage is also provided to determine the suitability of the tool geometry and material for RCT. The theoretical assessment of the RCT process chain indicated that it has potential benefits such as short manufacturing time, low manufacturing cost and good quality of tools in terms of surface finish and dimensional accuracy. Focusing on the step of AM of the sand moulds, the selection of available AM processes between the Laser Sintering (LS) using an EOSINT S 700 machine and Three Dimensional Printing using a Z-Corporation Spectrum 550 printer was addressed by means of the Analytic Hierarchy Process (AHP). The criteria considered at this stage were manufacturing time, manufacturing cost, surface finish and dimensional accuracy. LS was found to be the most suitable for RCT compared to Three Dimensional Printing. The overall preferences for these two alternatives were respectively calculated at 73% and 27%. LS was then used as the default AM process of sand moulds in the present research work. A practical implementation of RCT to the manufacturing of foundry tooling used a case study provided by a local foundry. It consisted of the production of a sand casting pattern in cast iron for a high pressure moulding machine. The investigation confirmed the feasibility of RCT for producing foundry tools. In addition it demonstrated the crucial role of casting simulation in the prevention of casting defects and the prediction of tool properties. The challenges of RCT were found to be exogenous mainly related to workmanship. An assessment of RCT manufacturing time and cost was conducted using the case study above mentioned as well as an additional one dealing with the manufacturing of an aluminium die for the production of lost wax patterns. Durations and prices of RCT steps were carefully recorded and aggregated. The results indicated that the AM of moulds was the rate determining and cost driving step of RCT if procurement of technology was considered to be a sunk cost. Overall RCT was found to be faster but more expensive than machining and investment casting. Modern surface analyses and scanning techniques were used to assess the quality of RCT tools in terms of surface finish and dimensional accuracy. The best surface finish obtained for the cast dies had Ra and Rz respectively equal to 3.23 μm and 11.38 μm. In terms of dimensional accuracy, 82% of cast die points coincided with die Computer Aided Design (CAD) data which is within the typical tolerances of sand cast products. The investigation also showed that mould coating contributed slightly to the improvement of the cast tool surface finish. Finally this study also found that the additive manufacturing of the sand mould was the chief factor responsible for the loss of dimensional accuracy. Because of the above, it was concluded that light machining will always be required to improve the surface finish and the dimensional accuracy of cast tools. Durability was the last characteristic of RCT tools to be assessed. This property was empirically inferred from the mechanical properties and metallographic analysis of castings. Merit of durability figures of 0.048 to 0.152 were obtained for the cast tools. It was found that tools obtained from Direct Croning (DC) moulds have merit of durability figures three times higher than the tools produced from Z-Cast moulds thus a better resistance to abrasion wear of the former tools compared to the latter.
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Tang, Caixian. "Soldering in magnesium high pressure die casting and its preservation by surface engineering." Swinburne Research Bank, 2007. http://hdl.handle.net/1959.3/22747.
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Thesis (PhD) - Swinburne University of Technology, Industrial Research Institute Swinburne - 2007.[A thesis submitted] for the degree of Doctor of Philosophy, Industrial Research Institute, Swinburne University of Technology - 2007. Typescript. Includes bibliographical references (p. 154-167).
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Kurilova, Jelena. "Developing Standardized Work in Casting Department : Case Study of Luvata Sweden AB Finspång." Thesis, Linköpings universitet, Kvalitetsteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58517.
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This thesis is one part of a lean project initiated by Luvata Sweden AB in Finspang casting department. The primary goal of that project is to increase the production efficiency, reduce costs and improve the quality of the copper coil. The aim of this thesis is to develop standardized work in casting department at Luvata Sweden AB Finspang. The research is based on lean thinking and organized in three steps. FIRST STEP: This step implies value stream mapping (VSM) of the current manufacturing process. VSM technique is applied in order to create an overview of the entirety production flow in a casting department, to visualize non-value added activities and to identify process wastes. SECOND STEP: By using lean tools as: Waste Management, SMED and Visual Management, thesis work intends to clean the production process. 7 Wastes or seven forms of Muda were studied at Luvata Finspang. The source of 5 wastes were identified and reduced/eliminated. SMED (single minute exchange of dies) analysis was carried out for a changeover during a casting montage in order to reduce the changeover time and streamline the montage process. Spaghetti diagram was applied particularly to inspect the best location for all montage materials, equipments and tools in a casting floor. Ensuring the efficient implementation of Waste Management and SMED practices Visual Management technique was used. This mean expresses the information about production process, its real-time status and results in a way that could be understood by operators in a shop floor. It is important to clean a production process before the standardized work can be developed, since the purpose of standardized work is to represent the best practice: method and sequence for each process. THIRD STEP: The last thesis step focuses on developing standardized work sheets as a steering tool for operators to follow the best practice while executing their tasks in each work center (melting, casting, rolling) and during the casting montage. The standardized work sheets are designed to show the approved way to perform the specific procedures and are expected to motivate operators to perform theirs job in the common way. That would consequently reduce high variation in operators performance. It would probably take several years before any reasonable improvements could be observed. However the developed standardized work sheets are already placed in the shop floor and successfully used by operators this is my small contribution to a big improvement project!
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EBERHARD, PARKER BROWNE. "TRACES OF MATERIAL AND PROCESS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1053445721.
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Matoušek, Roman. "Optimalizace lití a tuhnutí axiálních turbínových kol pro dosažení jemnozrnné struktury v odlitku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241942.
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The aim of this thesis is to investigate the influence of the structure of castings from the nickel superalloy Inconel 713 LC using rotation and cycling by casting table. The aim is to achieve a fine-grained structure and the best mechanical properties through varying the oscillation parameters during casting crystallization. Six castings of axial turbine wheel were initially casted for the purpose of this thesis. After evaluating their macrostructure, microstructure and mechanical properties, four additional axial turbine wheels were casted in order to validate the results.
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Bakir, Berna. "Defect Cause Modeling With Decision Tree And Regression Analysis: A Case Study In Casting Industry." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608427/index.pdf.
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In this thesis, we study improvement of product quality in manufacturing industry by identifying and optimizing influential process variables that cause defects on the items produced. Real data provided by a manufacturing company from the metal casting industry were studied. Two well-known approaches, logistic regression and decision trees, were used to model the relationship between process variables and defect types. The approaches used were compared.
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Söderström, Gustav. "Virtual networks in the cellular domain." Thesis, KTH, Mikroelektronik och Informationsteknik, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93117.
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Data connectivity between cellular devices can be achieved in different ways. It is possible to enable full IPconnectivity in the cellular networks. However this connectivity is combined with a lot of issues such as security problems and the IPv4 address space being depleted. As a result of this many operators use Network Address Translation in their packet data networks, preventing users in different networks from being able to contact each other. Even if a transition to IPv6 takes place and the potential problem of address space is solved, it is not likely that operators will leave their packet data networks open to the Internet. An alternative to solving the problem on the IP level is to use overlay networks. In an overlay network applications on the cellular devices identify themselves at the application level rather than on the IP level. While full IP connectivity always gives the most efficient routing, an overlay network can offer services that are difficult to implement on the IP level. This can enable an application to span Network Address Translating entities without having to share the entire device. They can also provide private dynamic virtual networks and groups for users that trust each other. These private networks can use permissions and group casting functions, without the problems associated with traditional IP multicast. The relatively limited bandwidths of the GSM and UMTS networks allow for application level routing of continuous data streams if the overlay network is distributed enough and mapped to the physical network in an efficient way. One of the advantages of using overlay networks is that although standard IP networks may be able to offer similar services in the future, overlay networks can be implemented in the existing IPv4 networks today at comparatively low costs. This may create the incentive needed in order for future larger investments to be justified. A distributed overlay network not only allows for real-time services such as instant messaging, which is already possible with a centralized server solution, but it also allows for higher bandwidth services such as video conferencing, Voice over IP, etc. that are not possible on a large scale with a centralized relaying server. An overlay network could be implemented by any third party without the support of an operator. This suggests that free networks may be created for what could be called reversed file sharing, i.e. networks where users upload files to each other rather than download as in most existing file sharing networks. These could become direct competitors to SMS, MMS and other operator-owned services. The thesis investigates the mentioned possibilities and potential threats. Along with this an implementation of an overlay network for cellular devices is created that is totally independent of the operator’s network.Datakonnektivitet mellan cellulära terminaler kan uppnås på olika sätt. Ett sätt är att utrusta de cellulära näten med full IP konnektivitet. Detta medför dock en del problem såsom säkerhetsfrågor och problem med att antalet IPv4 addresser kanske inte kan täcka framtidens behov. På grund av detta använder många operatörer såkallad nätverksadressöversättning i sina paketdatanät vilket hindrar användare i olika paketdatanät från att kunna kontakta varandra. Även om en framtida övergång till IPv6 löser problemen med för liten adressrymd så är det inte troligt att operatörerna kommer att lämna sina paketdatanät öppna mot resten av Internet. Ett alternativ till att lösa problemet på IP-nivån är att istället använda overlaynätverk. I ett sådant nätverk identifierar applikationer sig själva på applikationsnivån istället för på IP-nivån. Medans ren IP-konnektivitet innebär effektivast möjliga routing av data så erbjuder ett overlaynätverk möjlighet till tjänster som är svåra att implementera på IP-nivå. Bland annat kan applikationsnät som traverserar nätverksadressöversatta nätverk skapas utan att en mobil terminal behöver exponeras helt och hållet mot Internet. Dessa overlaynätverk kan också skapas dynamiskt och tillfälligt vilket ger användare möjlighet att skapa privata nätverk och grupper med med enheter de litar på, endast dessa får då tillgång till terminalen. Overlaynätverken kan också erbjuda multicast funktionalitet inom grupperna utan de problem som hör ihop med traditionell IP-multicast. De relativt begränsade bandbredderna i GSM och UMTS nätverken tillåter routing av data på applikationsnivån om overlaynätverket är tillräckligt väl distribuerat och effektivt mappat mot det underliggande nätverket. En av fördelarna med att använda overlaynätverk är att även om den eftersökta funktionaliteten kanske kan implementeras på IP-nivå i framtiden med hjälp av ny teknik så kan overlaynätverk implementeras i nuvarande IPv4-nätverk till relativt låga kostnader då de endast består av mjukvara som körs på existerande hårdvara. Ett distribuerat overlaynätverk erbjuder inte bara realtidstjänster såsom instant messaging vilket redan är möjligt och fungerar bra med en central serverlösning. Det distribuerade nätverket kan dessutom hantera routing av högre bandbredder mellan terminaler, såsom videokonferenser, Voice over IP etc. som inte är möjligt i stor skala med en centraliserad lösning. Overlaynätverk kan implementeras av en tredjepart utan operatörers samarbete. Detta kan innebära att gratisnätverk skapas för vad som skulle kunna kallas omvänd fildelning, dvs. nätverk där användare laddar upp information till varandra snarare än laddar ner vilket är fallet i de flesta existerande fildelningsnätverk. Dessa nätverk skulle kunna bli direkta konkurrenter till SMS, MMS och andra operatörsägda tjänster. Examensarbetet undersöker de nämnda möjligheterna och potentiella hoten i dessa nätverk. Utöver detta skapas även en implementation av ett overlaynätverk som är helt oberoende av operatörens nätverk.
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XU, TIJIE. "Detection of Final Solidification Due to Variation of Ferrostatic Pressure during Continuous Casting." Thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215960.
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This paper presents an investigation on using the variation of ferrostatic pressure exerted by the molten steel in the strand to the support rolls during continuous casting to detect the location of the final solidification. The final solidification point is of high importance for applying soft reduction during continuous casting in order to ensure inner quality and achieve high productivity. The measurement was conducted at one of the casters at SSAB Oxelösund, of which all the support rolls are separately mounted. The project finds that this method shows promising results and can help to narrow down the range of the location due to certain interferences and noises. The ferrostatic pressure decrease during tail-out and the variation of whether a pressure drop exists is the dividing line of full and partial solidification. With the promising results achieved, more effort should be put to further improve the method.
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Eneborg, Alexander, and Pontus Cronqvist. "A Study in Viking Age Brooches using Modern Technology : Simulating the Casting of a Baroque Bronze Brooch in Magma5 5.3.0.4." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189283.
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There is much that is unknown concerning the creation of Viking age brooches. Recreating these brooches in the same way they would have been created in the Viking age to try to understand how they were created is a time consuming project for experimental archaeologists. This study has been done in order to find out if the time spent can be reduced and at the same time gain a better understanding of the creation of a Viking age brooch using 3D scanning and computer simulations. Casting simulations of a real Viking age brooch have been done using Magma5, a state of the art simulation software. Simulations were run with several different casting systems, initial metal and mould temperatures, and both with as well as without the brooches distal figurines attached. It was found that the initial metal and mould temperatures has got impact on the final result of the brooch, but the alloy and casting system has a much greater effect on the final result. The casting system that yielded the best result has the pouring basin directly above the medial part of the brooch and two sprues leading to gates on the north and south medial sides.Det är mycket som inte är känt om tillverkningen av vikingatida broscher. Att försöka återskapa dem på samma sätt som vikingarna antagligen skapat dem för att öka kunskapen kring broscherna är ett tidsödande jobb. Denna studie har gjorts för att ta reda på om den tiden kan reduceras och samtidigt öka kunskapen kring broscherna med hjälp av modern teknik som 3D skanning och datorsimuleringar. Gjutsimuleringar av ett äkta vikingatida spänne har skett i Magma5, ett kraftfullt simuleringsprogram. Simuleringar utfördes med hjälp av flera olika gjutsystem, stor variation i smältans och formens initiala temperaturer, och både med och utan broschens distal figuriner. Studien har funnit att smältans och formens temperaturer har påverkan på broschens slutresultat, men legeringen som används och gjutsystemet har betydligt större påverkan på slutresultatet. Gjutsystemet som gav bäst slutresultat har ett inlopp som är placerat direkt över mitten på den mediala delen, och sedan förgrenar sig i två delar och ansluter till den norra och södra delen av formkaviteten.
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Chastain, Matthew Lincoln. "The ceramic technology of bronze-casting molds in ancient China : production practices at three western Zhou foundry sites in the Zhouyuan area." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122073.
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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 681-718).
During the second and first millennia BCE, peoples living near China's Yellow and Yangzi Rivers produced bronze ritual and military paraphernalia that represent arguably the most sophisticated use of metal casting by any ancient society. These objects were cast by pouring bronze into mold assemblies composed of interlocking sections. To survive the mechanical and thermal rigors of this casting process, the mold sections were constructed from highly specialized ceramic materials. This study investigates these ceramic materials. The primary focus is three foundry sites (Zhougongmiao, Kongtougou, Lijia) in the Zhouyuan area, Shaanxi province, a major bronze production center during the Western Zhou period (1045-771 BCE). Casting molds (72 total), other ceramic artifacts, and soils, all from the Zhouyuan area, were analyzed using electron microscopy, optical microscopy, and infrared spectroscopy.
Results were compared to similar analyses of molds from other sites in China (Houma, Xinzheng, Tangjiadun, Shigudun). Replication experiments were undertaken to reconstruct the production process of casting molds and to identify the performance advantages of ancient casting-mold material. Casting molds were made from a material unlike the clay-rich pastes used for pottery. This material, here called "silt paste", consists of a porous network of silt-sized (3.9-62.5[mu]m) quartz particles held together by a small proportion of clay. Across north-central China, similar material was used to make molds for all types of bronze objects. Silt paste was produced from commonplace loessic soils. Its composition and properties were manipulated by processing the soil to remove much of its clay. The resulting low-clay paste offers little workability, requiring specialized forming techniques. "Piping" was used to decorate some molds. Molds were fired at 400-700°C.
The low clay content and low firing temperature of casting-mold material ensured minimal drying shrinkage and high thermal shock resistance, minimizing the risk of failure during the casting process. Producers at the three Zhouyuan-area sites practiced different engineering strategies, apparently because casting technology descended from the earlier Shang tradition was introduced into the area midway through the Western Zhou period. Differences in soil resources between northern and southern China may have influenced how bronze casting developed in each region.
by Matthew Lincoln Chastain.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Materials Science and Engineering
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Ren, Qizheng. "The Application of Gage R&R Analysis in s Six Sigma Case of Improving and Optimizing an Automotive Die Casting Product’s Measurement System." TopSCHOLAR®, 2015. http://digitalcommons.wku.edu/theses/1536.
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With the rapid development of automation technology in automotive manufacturing processes, massive and efficient production is a current trend. Therefore, measurement systems with accurate and automated measuring instruments are sought by automotive companies and suppliers. However, the problematic measuring instruments with unreliable accuracy and stability lead to erroneous measurements and wrong quality decisions that cause manufacturers huge profit losses. An effective method called “measurement system analysis” can be applied to define and eliminate erroneous measurements to ensure adequate reliability. An automotive transmission die casting parts supplier called company T was suffering a serious profit loss due to the erroneous measurements from one type of their product’s measurement system. These erroneous measurements caused the company to deliver nonconforming products to their customers. The researcher conducted a study applying Six Sigma methodology to find out the root cause of the erroneous measurements and eliminate the erroneous measurements to retain adequate reliability. The researcher used DMAIC (Define, Measure, Analysis, Improve, and Control) process as framework to conduct the study and the measurement system analysis, Gage R&R method, to process several experiments for data collection and analysis. Through processing the experiments and analyzing the results, the researcher was able to detect the source of variation and find the root cause that caused the erroneous measurements. Based on the findings, the researcher then corrected the erroneous measurements and improved the problematic measurement system’s performance.
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Pereira, Manuel Filipe Viana Teotonio. "ADDITIVE MANUFACTURING OF COMPONENTS FOR IN-DIE CAVITY USE, SUITABLE TO WITHSTAND ALUMINIUM HIGH PRESSURE DIE CASTING (HPDC) PROCESS CONDITIONS." Thesis, Bloemfontein: Central University of Technology, Free State, 2013. http://hdl.handle.net/11462/243.
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Thesis (M. Tech. (Engineering: Mechanical)) -- Central University of Technology, Free State, 2013This research examines the suitability of Additive Manufacturing (AM) for manufacturing dies used in aluminium high pressure die casting. The study was guided by the following objectives: • The reviews of applicable literature sources that outline technical and application aspects of AM in plastic injection moulds and the possibilities of applying it to high pressure casting die. • To introduce AM grown die components in die manufacture. Further, to develop a methodology that will allow industry to apply AM technology to die manufacture. • Revolutionise the way die manufacture is done. The potential for AM technologies is to deliver faster die manufacture turnaround time by requiring a drastically reduced amount of high level machining accuracy. It also reduces the number of complex mechanical material removal operations. Fewer critical steps required by suitable AM technology platforms able to grow fully dense metal components on die casting tools able to produce production runs. • Furthermore, promising competitive advantages are anticipated on savings to be attained on the casting processing side. AM technology allows incorporation of features in a die cavity not possible to machine with current machining approaches and technology. One such example is conformal cooling or heating of die cavities. This approach was successfully used in plastic injection mould cavities resulting in savings on both the part quality as well as the reduction on cycle time required to produce it (LaserCUSING®, 2007). AM technology has evolved to a point where as a medium for fast creation of an object, it has surpassed traditional manufacturing processes allowing for rapidly bridging the gap between ideas to part in hand. The suitability of the AM approach in accelerating the die manufacturing process sometime in the near future cannot be dismissed or ignored. The research showed that there is promise for application of the technology in the not too distant future. In the South African context, the current number and affordability of suitable AM platforms is one of the main stumbling blocks in effecting more widespread applied research aimed at introduction of the technology to die manufacture.
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Mäkinen, Katri. "Optimisation of local material parameters : Optimising local material parameters in ductile cast iron cylinder head casting." Thesis, Jönköping University, JTH, Material och tillverkning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54500.
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The constantly tightening emission regulations demand the engines to be moreefficient, to get more power out of smaller engines. Higher engine loads andcomponent temperatures are causing more stresses to engine components. Therefore,a company that produces engines wanted to study if it would be possible to increasethe capabilities of the components by optimising the used material. In this final project work, a cylinder head will be studied. The cylinder heads for theengines are made of ductile cast iron. The limits of that material are near safety limits,and therefore a better material is needed. In this work are some previous studiesanalysed and tried to find how to optimise the used material. The optimised materialshould have better thermal conductivity properties combined with sufficient strengthproperties. Previous studies were analysed to gather knowledge of the elements that affect thematerial parameters. Those studies showed that copper, silicon, pearlite fraction, andthe use of chills are the elements to be optimised. Silicon and pearlite fraction waschosen as optimisation parameters because of their effect on the thermal conductivityand strength properties. Copper was chosen as an optimisation variable due to its effecton the pearlite formation. Chills were used to affect the cooling rate and thereby thepearlite formation. The work was made using MAGMASOFT™ simulation software to simulate cylinderhead casting. The simulated cylinder head was divided into 4 parts for the simulations.For those sections were then set targets for pearlite fraction according to previousstudies. The silicon content was kept constant in the simulation, based on the studiespresented in this work. Copper content was simulated with variations from 0 to 0.7weight-%, and chill heights were simulated from 20 to 60 mm and without chills. After simulating the different variables, the results were analysed. Then the selectedcasting simulation result was mapped to finite element simulation mesh to include thelocal material parameters to finite element simulation. With the finite elementsimulation, the estimated lifetime of the component was simulated. By analysing the casting simulation results, an optimal combination was found. Theoptimal material parameters for a cylinder head casting would be copper 0.5weight-%, silicon 1.9 weight-% and chills thicker than 40 mm on the flame plate. Theoptimised material gives more possibilities to develop engines even further when thecomponent demands are growing.
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Ullal, Pratheek. "Development of Fluidity Measurement Technique and Automation of Measurement Station : Developing the existing Fluidity Measurement Station by automating the operation and measuring the fluidity digitally with MATLAB Image Processing Tools." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Konstruktion och produktutveckling, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45288.
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Bryne AB has invented a device called Loop for measuring the fluidity of molten metal. Loop is made up of refractory fiber material and has a dimension of 196 sq.mm within which there is an engraved spiral shaped runway for the molten metal to flow. The distance traveled by the molten metal in the spiral determines its fluidity and is measured visually by the operator with the help of the spiral scale printed on the Loop. A workstation is used to support the Loop for an easier and better working environment. At present, the entire operation of fluidity measurement is done manually. The aim of the thesis is to develop an automatic workstation for the fluidity measurement and find a technique to measure the fluidity without human visual aid. Further, an attempt has been made to find a way to store and retrieve the measured values for future use. The automation of the workstation is done with the help of Arduino Uno circuit board for electrical connections and Arduino IDE for programming the circuit. MATLAB image processing tool is used for measuring the fluidity digitally. The prototype of the automated workstation is built and showcases the ability to reduce the time and operational errors. The automation of the unplugging operation saves up to 7 seconds. The digital measuring of the fluidity with FLIR thermal camera and MATLAB image processing tool does not show significant improvement in accuracy in measurement, but it reduces the dependency on the expertise of the operator. There is an error of 12.7% from the actual fluidity value.
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Macko, Martin. "Vliv použitých surovin na konečnou kvalitu Al odlitků zhotovených technologií vytavitelného modelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382187.
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The purpose of this thesis is to assess the current state of production of ceramic shells in MESIT Foundry, a.s. and optimize it. The shells are evaluated in terms of their bending strength, gas permeability and microstructure. Subsequently, castings produced using the shells are evaluated with regard to number of non-conforming products and presence of defects. The final part seeks to compare different shells and outlines a possible new approach to the development of ceramic shells.
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Metelková, Jitka. "Řezání litých superlitin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-256567.
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This work deals with the issue of defects generation during the separation of the castings from a nickel-based superalloy, Inconel 738LC. The technology of investment casting is presented, followed by a description of metallurgy of superalloys, their physical and mechanical properties, as well as their technical applications. The machinability of superalloys and method of castings separation were also described as well as some of the casting defects that were reported to have impact on the generation of the defects after cutting. In the experimental part, the material microstructure and casting defects were analyzed. The experimental machining part consisted first of a comparative study of the friction sawing and plasma arc cutting technology at the standard operating conditions actually used in production. Second, an optimization study for the friction sawing was carried out, with a special focus on the suitability of an alternative cutoff wheel for the chosen application. Application of this wheel allows reducing the security distance between the cut and the part, thus reducing the production cost of the part.
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Richetti, Andresa. "Design e tecnologia : diretrizes para a estruturação de sistema informacional sobre ferros fundidos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/114451.
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Esta pesquisa tem por objetivo apresentar uma proposta de um sistema informacional constituído por ficha técnica sobre materiais, como estudo de caso os ferros fundidos (FoFos). Para auxiliar na formulação dessa proposta, foi desenvolvido um glossário através do embasamento nos pressupostos da Teoria Comunicativa da Terminologia (TCT). As etapas que delinearam o estudo terminográfico iniciaram na definição do corpus para a coleta de termos específicos sobre a área, para isso, realizou-se uma análise de plataformas informacionais sobre materiais similares, e as demais informações relevantes foram elencadas em material bibliográfico, seguido da coleta e distribuição (mapas conceituais) dos dados para a elaboração da ficha síntese, concluindo com a definição dos termos selecionados. Para compor o banco de dados, foram realizados procedimentos experimentais de metalografia com o viés de obter micrografias dos diferentes tipos de ferros fundidos além da obtenção de imagens de produtos acabados e o desenvolvimento de pictogramas para o design da informação. Com uma linguagem adaptada para atender o binômio Design e Engenharia, o sistema informacional apresenta informações técnicas relevantes para o desenvolvimento de um projeto, conteúdo de fácil acesso para ser utilizado em ambientes distintos, como salas de aula, escritórios, indústrias e outros.This research aims to present a formal proposal of a informational system consisting of technical sheet and glossary, being Casting Iron (FoFos) the case study. For the formulation of this proposal, it was developed a glossary through the basement on the presuppositions of the Communicative Theory of Terminology (CTT). The steps that outlined the terminographic study began on the corpus definition for the collection of specific terms about the field, therefore, it was accomplished an informational standards analysis on similar materials, and further relevant information were listed as bibliographic material, followed by gathering and distribution (conceptual maps) of the data for the elaboration of the synthesis record, concluding with the definition of the selected terms. In order to compose the database, metallographic experimental procedures were made, keeping in mind the bias of obtaining micrographies from the different types of casting iron, plus the attainment of finished products images, and the pictograms process to design of the information. Along an adapted language for the binomial Design and Engineering support, the informational system presents relevant technical information for the upgrowth of a project, easy access content to be used over distinguished environments, such as classrooms, offices, factories and others.
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Hřebíček, Lukáš. "Ověřování původních technologií pro výrobu uměleckých odlitků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228151.
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This diploma thesis is describing making of the same art casting by using different foundry technologies/ moulds (ceramic shell mould, several types of plaster moulds including anhydride gypsum and also natural sand mould). In this thesis there is also description of casting the famous piece of bull from “Byci skala” (Bull Rock). The bull was cast into traditional clay mould which is believed to be the original technology. Also the original shape of the bull casting was reconstructed, i.e. a copy of the original bull casting made. As the main achievement of this work is an overview and comparison of several technologies suitable for making art castings.
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Bílek, Josef. "Sestavení technologie součásti "skříň bezpřevodového výtahového stroje" pro TPV sériové výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229219.
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This diploma work deals with a production technology of a casing for a gear-less elevator in a batch production. A technological analysis of the product is done, including two grades of materials for castings or weldments. The technology of machining includes a NC program. Both production variants have been assessed and the optimal production according to selected criteria is recommended.
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Gokce, Neslihan. "Effect Of Fiber And Resin Type On The Axial And Circumferencial Tensile Strength Of Fiber Reinforced Polyester Pipe." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609930/index.pdf.
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In this study, the aim is to investigate the stiffness, longitudinal tensile strength and circumferential tensile strength of short fiber reinforced polyester composite pipes produced by centrifugal casting production method. To achieve this aim, theoretical calculation of modulus of elasticity of pipes was done and then test program was carried out on pipe samples produced with three different resin types which were orthophthalic, isophthalic and vinyl ester resin and three different fiber types which were E glass fiber, ECR glass fiber and basalt fiber. The tests were performed according to ISO (International Organization for Standardization) standards.
When resin type and fiber type effect on the fiber reinforced polyester pipe samples were evaluated, calculated elastic modulus values were in accordance with the test results.
According to the experimental test data, which were used to evaluate the effect of resin type on fiber reinforced polyester pipe properties, there is not a significant difference was observed in the stiffness, longitudinal and circumferential tensile strength test results of pipes having different resin types. In other words, there was not a significant effect of resin type on the stiffness, longitudinal tensile strength and circumferential tensile strength of short fiber reinforced pipes produced by centrifugal casting method.
According to the experimental test data, which were used to evaluate the effect of fiber type on the properties of fiber reinforced polyester pipe, basalt fiber reinforced pipe samples showed higher mechanical performance over E glass fiber and ECR glass fiber reinforced pipes. However, the test results of basalt reinforced polyester pipe were not as good as the individual properties of basalt fiber.
Finally, by comparing the basalt fiber reinforced pipe samples having almost the same stiffness and tensile test results as E glass fiber reinforced pipe samples, the gain in fiber and resin amount were investigated. Basalt fiber reinforced pipes were slightly lighter and thinner than E glass fiber reinforced pipes. However, the decrease in the amount of the fiber and resin in basalt reinforced pipe did not result in an overall cost reduction.
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Soukupová, Lucie. "Optimalizace technologie výroby odlitků ze slitin Al metodou vytavitelného modelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230978.
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Diploma thesis is focused to the optimization of the ceramic shell for pouring thin walled aluminium castings by investment casting technology. The main objective is firstly to find the optimal binding system (ceramic slurry) and stucco materials for the shell and secondly its optimal structure and heat treatment (drying of each coat and final shell firing) before metal pouring.
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Greß, Thomas Manfred [Verfasser], Wolfram [Akademischer Betreuer] Volk, Wolfram [Gutachter] Volk, and Babette [Gutachter] Tonn. "Vertical Continuous Compound Casting of Copper Aluminium Semi-Finished Products : Design of a Resource-Efficient Production Technology for the Formation of Metallurgically Bonded Bilayer Parts / Thomas Manfred Greß ; Gutachter: Wolfram Volk, Babette Tonn ; Betreuer: Wolfram Volk." München : Universitätsbibliothek der TU München, 2021. http://d-nb.info/1240384084/34.
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Kachyňa, Stanislav. "Návrh výrobní technologie součásti obráběcího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229221.
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This thesis deals with design for manufacturing technology single part on machine FS, which is the connecting part. Work deals with the material of this component, therefore, cast iron with lamellar graphite, the properties of this material, primarily focusing on the machinability. Due to the shape and dimensions of the workpiece is also described problems cutting of box parts, the most common operations used in their manufacture, including cutting tools and materials. These findings are then applied in terms of the company TOS Kuřim - OS a.s. An analysis of current manufacturing technology and design is made for its amendment. In conclusion with the technical-economic evaluation.
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Findeisen, Sebastian. "Zykluszeitreduzierung beim Druckgießen durch mehrteiligen Werkzeugaufbau." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2015. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-161111.
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In der Dissertation wurde der Stand der Technik zum Fertigungsverfahren Druckgießen mit dem Fokus auf die Druckgießwerkzeuge recherchiert und strukturiert aufbereitet. Der Stand der Technik mündet in der Systematik zur Optimierung des Druckgießens. Darin wurde die Problematik ganzheitlich aufgearbeitet, konkretisiert und wesentliche Handlungsfelder, wie das Temperierkonzept, der Werkstoff sowie die Auslegung, herausgearbeitet. Das Handlungsfeld Temperierkonzept wurde fokussiert und daraus das Konzept des mehrteiligenWerkzeuges erarbeitet. DiesesWerkzeugkonzept ermöglicht durch seinen Aufbau eine Maximierung der Wärmeübertragungsfläche, eine Reduzierung des Abstandes der Temperierung zum Gussteil und eine Erhöhung des Wärmeübergangskoeffizienten. Der mehrteilige Aufbau wurde in einem Versuchswerkzeug für das Druckgießen umgesetzt, sukzessive ausgelegt und virtuell abgesichert. Abschließend zeigte die thermische Simulation des Prozess Druckgießen ein Potential zur Reduzierung der Zykluszeit von 12,9s (14%) mit dem mehrteiligen Werkzeug auf. Im Dauerbetrieb konnte prozesssicher, reproduzierbar und dauerhaft eine Zykluszeitreduzierung um 20,5s (23%) nachgewiesen werden.
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Rothwell, Brigitte. "The effect of casting motion to mobilize stiffness on proximal interphalangeal joint motion and stiffness dissertation [thesis] submitted in partial fulfilment of the requirements for the degree of Master of Health Science, Auckland University of Technology, June 2004." Full thesis. Abstract, 2004. http://puka2.aut.ac.nz/ait/theses/RothwellB.pdf.
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Kosour, Vojtěch. "Využití numerické simulace k optimalizaci výroby voskových modelů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234157.
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Production of wax pattern model by injection machine is a one of the key phases of Investment casting process. The thesis deals with the development of numerical simulation wax blend injection in to metal die. The possibilities of selection simulation software – ProCast and Cadmould are described in the relation to numerical predictions of wax injection. Creating of material database of selected wax blends is described. The prototype simulations of die filling are made. The special testing die are designed a used for created simulations. The measurements of initial conditions are mentioned.
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Žuja, Jaroslav. "Optimalizace technologie výroby voskových modelů ve firmě Fimes." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232109.
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This thesis is to evaluate currently used wax and compare its properties with of newly purchased one. Further, it is to evaluate whether the quality is reflected by using "boiled wax'', which is being used as a runner wax. All tests were carried out at the Fimes a. s. In the first part of this thesis, there is a brief description of the lost wax method. This is followed by a decription of wax blends from technology point of view. The experimental part describes the operations from the production of wax patterns, through their dimensional inspection, up until dewaxing process. All the results are noted and compared.
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Šmíd, Dušan. "Optimalizace technologie vybraných náročných odlitků ze slitin Al." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228725.
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The main target of this thesis is to choose the suitable hard filled wax for the invest-ment casting foundry Fimes a.s. There are several suppliers of these waxes in the World and in this work waxes of the most reputable suppliers from Europe have been investigated. During these tests there were mainly technological properties of the waxes and also dimensions of both wax patterns and also the final castings measu-red. Suitability of the tested waxes, their technological characteristics, analysis of di-mensions and finally basic economical calculations have been then used in this the-sis as a tool for the recommendation for the most suitable wax for the Fimes foundry.
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Olson, Petter. "Vad krävs för en halverad energianvändning i Sveriges bebyggelse till år 2050? : En backcasting studie med sex scenarion för en hållbar energianvändning i den svenska bostads- och servicesektorn." Thesis, KTH, Industriell ekologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210732.
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I Sverige står bostads- och servicesektorn för ca 40 procent av den totala energianvändningen. Riksdagen hade fram till år 2012 ett specifikt mål om att halvera energianvändningen i sektorn till år 2050. I väntan på att ett nytt mål antas skrivs att innebörden för målet kvarstår. Till 2050 ska energianvändningen ha halverats. Denna rapport är en backcastingstudie som har som mål att analysera vad som krävs för att uppnå halveringsmålet genom satsning på fyra huvudåtgärder; nyproduktion, ombyggnad, stegvis förbättring och effektivare användning av bostadsbeståndet. Sex scenarion har satts upp, ett för varje huvudåtgärd och två scenarion som kombinerar de övriga fyra. Resultatet visar vilken väg som kan tänkas vara bäst att gå och at tstora insatser för att nå målet kommer att krävas. Dessa berör bostads- och servicesektorns alla aktörer samt beslutsfattare på samhällets alla nivåer. En beräkning för den potentiella besparingen i koldioxidutsläpp till följd av energiminskningen har också gjorts. Utsläppsminskningarna kan som följd komma att bli av betydande storlek och kan bidra till att Sverige blir ett föregångsland i omställningen till ett hållbart samhälle.In Sweden, the dwelling and service sector accounts for approximately 40 percent of the total energy use. Up until 2012, the parliament had a specific goal to reduce the energy use by half in the sector to 2050. While waiting for a new goal to be set however, the parliament states that the implication of the goal remains. The energy use shall be reduced by half before the year 2050. This report is a back-casting study that has the aim to analyze what it takes to reach the goal by focusing on four main measures; new construction, reconstruction, gradual improvement and more efficient use of the heated areas in residential buildings. Six scenarios have been set up, one for every main measure and two scenarios that combine the other four. The result shows what path might be best to choose and that extensive and rapid transformationis necessary to reach the goal. These contributions affect all the involved actors as well as stakeholders on all the different levels of society. Resulting reductions in carbon dioxide emissionsdue to the decrease in energy use have also been calculated. The potential reduction can become significant in size and contribute to making Sweden a pioneer in the transformation to asustainable society.
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Štipl, Pavel. "Technologie lití vysokotlakých odlitků a vlivy působící na jejich kvalitu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231432.
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This diploma thesis deals with the technology of high pressure die casting and especially influences having effect on their final quality. The aim of this thesis is to design the measures to convert casting of the cylinder for chainsaw into the serial production. The thesis contains a description of the production of castings by technology of high pressure die casting, theoretical analysis of the factors with effects on their final quality and practical description of the conversion casting of cylinder for chainsaw into the serial production. The problem of converting to serial production has been solved by several samplings and final test series. Part of each sampling is analysis of defects and design of measures leading to elimination or at least minimization of such defects. On the basis of the production process has been successfully optimized and casting of the cylinder for chainsaw was successfully converted into the serial production. The results of this work also allowed for a smooth conversion into the serial production of another type of cylinder, manufactured by company MOTOR JIKOV.