Статті в журналах: "Quality of castings"

1

Gawdzińska, K. "Quality Features of Metal Matrix Composite Castings." Archives of Metallurgy and Materials 58, no. 3 (September 1, 2013): 659–62. http://dx.doi.org/10.2478/amm-2013-0051.

Повний текст джерела

Анотація:

Abstract In this paper it is stated, that a set of quality features of metal matrix composite castings differs from the same set for castings of classic materials, although some features are common for both of these material groups. These features (pertaining to a set of quality characteristics of composite castings) have been named as specific, they have not been determined yet and a description of material quality should be performed (according to the qualitology) on a principle of description of quality characteristics of this product. Therefore, this set of features has been determined. It was proposed to add the following characteristics to the set of specific features of composite castings quality: matrix material, reinforcement material, binding between components and porosity of the composite casting. In this set a sub-set of quality characteristics of composite castings was also determined.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Odilov, Furkat, and Farrukhjon Abdullaev. "Improving The Technology Of Continuous Casting Of Steel Castings." American Journal of Engineering And Techonology 03, no. 04 (April 30, 2021): 108–17. http://dx.doi.org/10.37547/tajet/volume03issue04-17.

Повний текст джерела

Анотація:

This article describes the quality and cost-effectiveness of converting steels by melting them in electric arc furnaces. In addition, the technology of continuous casting of cast products in the furnace with the help of ferroalloys, followed by various equipment.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Gavariev, R. V., and I. A. Savin. "Improvement of Surface Quality of Casting Produced by Casting under Pressure." Solid State Phenomena 265 (September 2017): 988–93. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.988.

Повний текст джерела

Анотація:

The article considers the surface roughness of compression molds castings received by casting under pressure depending on the condition of the form-building surface. The technological process of casting under pressure is presented for the "Strike plate" product, concrete technological parameters values are specified. The pilot studies of the roughness of the castings throughout the entire period of operation of a compression mold are conducted. Based on the received values the recommendations about improvement of quality of a surface of castings by drawing sheetings are submitted by phisical vapour deposition method.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Nadolski, M., Z. Konopka, M. Łągiewka, and A. Zyska. "The Influence of the Mould Filling Conditions on the Quality of Castings Made of EN AC-44000 Alloy." Archives of Foundry Engineering 14, no. 2 (June 1, 2014): 19–22. http://dx.doi.org/10.2478/afe-2014-0029.

Повний текст джерела

Анотація:

Abstract The work deals with the influence of change in the filling conditions of the ceramic moulds with plaster binder on the presence of gaseous porosity and the microstructure of the achieved test castings with graded wall thickness. Castings made of EN AC-44000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting were compared. The results of examinations concerning the density of the produced castings indicate that no significant change in porosity was found. The increased size of silicon crystals was found for the increased wall thicknesses due to the slower cooling and solidification of castings.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Roskosz, Stanisław, Bartłomiej Dybowski, and Robert Jarosz. "Influence of Mould Cooling Rate on the Microstructure of AZ91 Magnesium Alloy Castings." Solid State Phenomena 191 (August 2012): 115–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.191.115.

Повний текст джерела

Анотація:

Magnesium alloys are the lightest, widely used structural material. They are often used in aeronautical and automotive industries, where the weight savings are essential. Due to high responsibility of the elements made from magnesium alloys it is important to achieve high quality castings without any defects. The paper presents results of investigations on impact of sand mould cooling rate on microstructure and quality of the castings. Six identical castings, fed and cooled in different ways were investigated. Studies consisted of: RTG investigations and SEM and LM observations. Microstructure was evaluated qualitatively and quantitatively. RTG investigations showed that casting without feeder and cooler, casting only with feeder and castings cooled with 20mm and 40mm thick cooler contains voids inside. Castings with feeder and coolers 20mm and 400mm thick were flawless. Microstructure evaluation showed that castings with and without defects have different structure. Castings with defects were characterized by higher volume fraction of Mg17Al12 intermetallic phase. Flawless castings were characterized by fully divorced eutectic.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Korchmit, Anton Viktorovich, Nikita V. Martyushev, and Yuriy Yu Drozdov. "Casting Quality Enhancement of Bushings Made of Foundry Aluminium Bronzes." Key Engineering Materials 685 (February 2016): 459–62. http://dx.doi.org/10.4028/www.scientific.net/kem.685.459.

Повний текст джерела

Анотація:

The paper is devoted to the establishment of the technology of castings manufacture out of multicomponent aluminium bronzes for oil and gas producing equipment. Aluminium bronze containing iron has been chosen as a material for casting manufacture. Founding into sand mixtures has been chosen as a manufacturing method. It has been shown that this type of founding allows obtaining the castings with minimal subsequent treatment and high quality surface. The use of the coke furnace at metal melting allows obtaining the castings with high performance characteristics due to gas protection of the melt.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Acimovic-Pavlovic, Zagorka, Milutin Djuricic, Sasa Drmanic, and Rade Djuricic. "The influence of the parameters of lost foam process on the quality of aluminum alloys castings." Chemical Industry 64, no. 2 (2010): 121–27. http://dx.doi.org/10.2298/hemind100301011a.

Повний текст джерела

Анотація:

This paper presents the research results of application of Lost foam process for aluminum alloys castings of a simple geometry. The process characteristic is that patterns and gating of moulds, made of polymers, stay in the mould till the liquid metal inflow. In contact with the liquid metal, pattern intensely and in relatively short time decomposes and evaporates, which is accompanied by casting crystallization. As a consequence of polymer pattern decomposition and evaporation a great quantity of liquid and gaseous products are produced, which is often the cause of different types of casting errors. This paper presents the results of a research with a special consideration given to detecting and analyzing the errors of castings. In most cases the cause of these errors are defects of polymer materials used for evaporable patterns production, as well as defects of materials for refractory coatings production for polymer patterns. The researches have shown that different types of coatings determine properties of the obtained castings. Also, the critical processing parameters (polymer pattern density, casting temperature, permeability of refractory coating and sand, construction of patterns and gating of moulds) significantly affect on castings quality. During the research a special consideration was given to control and optimization of these parameters with the goal of achieving applicable castings properties. The study of surface and internal error of castings was performed systematically in order to carry out preventive measures to avoid errors and minimize production costs. In order to achieve qualitative and profitable castings production by the method of Lost foam it is necessary to reach the balance in the system: evaporable polymer pattern - liquid metal - refractory coating - sandy cast in the phase of metal inflow, decomposition and evaporation of polymer pattern, formation and solidification of castings. By optimizing the processing parameters castings of required structural and mechanical characteristics could be achieved, casting defects characteristic for this process could be avoided with the result of the production costs saving. The presented results can be useful to define parameters of Lost foam process and its application in practice with objective to obtain castings with in advance specified quality.

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Gaspar, Stefan, and Ján Pasko. "Analysis of Fracture Process and Common Defects in Casting Alloys EN43100 Manufactured by Die Casting Technology." Advanced Materials Research 1077 (December 2014): 39–43. http://dx.doi.org/10.4028/www.scientific.net/amr.1077.39.

Повний текст джерела

Анотація:

Recent research in the process of die casting production of aluminium alloys which are nowadays deeply implemented in the rapidly developing automobile, shipping and airline industry aims to increase the manufacture and quality properties of the casting in order to obtain its high mechanical properties at acceptable economic costs. In terms of ensuring the quality indicators in the production of aluminium castings it is necessary to pay close attention to internal structural quality of the castings characterized by type and extent of foundry defects (cavities, Al2O3 particles, internal cold laps). The presenting contribution deals with the analysis of the fracture process, the microorganism disturbance of test samples, the impact of casting speed on the occurrence and extent of the castings porosity and reasons for the internal foundry defects of casting alloys EN 43100 manufactured by die casting technology.

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Dybowski, B., A. Kiełbus, and R. Jarosz. "Mould Components Impact on Structure and Quality of Elektron 21 Alloy." Archives of Foundry Engineering 13, no. 2 (June 1, 2013): 17–23. http://dx.doi.org/10.2478/afe-2013-0029.

Повний текст джерела

Анотація:

Abstract Magnesium alloys due to their low density and high strength-to-weight ratio are promising material for the automotive and aerospace industries. Many elements made from magnesium alloys are produced by means of sand casting. It is essential to investigate impact of the applied mould components on the microstructure and the quality of the castings. For the research, six identical, 100x50x20mm plates has been sand cast from the Elektron 21 magnesium casting alloy. Each casting was fed and cooled in a different way: one, surrounded by mould sand, two with cast iron chills 20mm and 40mm thick applied, another two with the same chills as well as feeders applied and one with only the feeder applied. Solid solution grain size and eutectics volume fraction were evaluated quantitatively in Met-Ilo program, casting defects were observed on the scanning electron microscope Hitachi S3400N. The finest solid solution grain was observed in the castings with only the chills applied. Non metallic inclusions were observed in each plate. The smallest shrinkage porosity was observed in the castings with the feeders applied.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Midson, Stephen. "Industrial Applications for Aluminum Semi-Solid Castings." Solid State Phenomena 217-218 (September 2014): 487–95. http://dx.doi.org/10.4028/www.scientific.net/ssp.217-218.487.

Повний текст джерела

Анотація:

The goal of this paper is to examine industrial applications for semi-solid castings, and to develop strategies necessary for the wider commercialization of the semi-solid casting process. The performance and production techniques of semi-solid castings are reviewed, with the goal of identifying commercial niches where semi-solid castings can provide clear benefits over other casting process. A comparison of mechanical properties between semi-solid castings and other casting processes is presented. In addition, this paper provides an evaluation of the features of the optimal semi-solid casting processes, examines the characteristics of components that would benefit for production by semi-solid casting and describe the types of quality systems that casters need to have in place to make these types of castings. Cost analyses are presented suggesting that rheocasting can complete well with other casting processes.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Chang, Qing Ming, Yin Kai Yang, Jing Yuan, and Xia Chen. "Numerical Simulation of Mold Filling and Solidification Behavior in Permanente Casting Process." Applied Mechanics and Materials 313-314 (March 2013): 179–83. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.179.

Повний текст джерела

Анотація:

Melt flow and casting solidification are essential parts of the permanent mold casting process and affect significantly the quality of castings．For this reason, accurate prediction of mold filling pattern and temperature field in permanent mold castings plays on an important role in producing sound castings. In this paper, the model filling and solidification of a box casting produced from an aluminum alloy is studied. Different casting processes are employed, simulated and optimized to obtain sound castings. Simulation results reveal that with appropriate gating system, pouring rate, cooling line, a smooth mold filling, reduced shrinkages and other defects are available and desired sound castings can be produced.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Gaspar, Stefan, and Jan Pasko. "Increase Pressure and Homogeneity of Die Castings from EN AC 47100 Alloy." Applied Mechanics and Materials 729 (January 2015): 108–13. http://dx.doi.org/10.4028/www.scientific.net/amm.729.108.

Повний текст джерела

Анотація:

In the pressure die casting process, a great attention is paid to a die castings quality improvement. This quality has to be ensured with a great reliability and, at the same time, it is necessary to apply control methods to a technological process which provide a complete picture of a die casting process as well as internal quality of the produced die castings. It requires control of the present technological factors of a pressure die casting process. The contribution deals with the effect of die casting plunger velocity inside a filling chamber on mechanical properties of a die casting product from EN AC 47100 alloy.

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Gavariev, Renat V., and Ksenia N. Gavarieva. "Features of Casting Magnesium Alloys in Chill Mold." Materials Science Forum 1052 (February 3, 2022): 287–91. http://dx.doi.org/10.4028/p-679e24.

Повний текст джерела

Анотація:

The article describes the features of the casting process in the chill mold of magnesium alloys. The main factors affecting the quality of the castings obtained are indicated. The main defects of magnesium castings obtained by chill mold casting, as well as possible ways to eliminate them, are revealed. Options for improving the efficiency of the casting process by optimizing the process parameters are proposed, as well as options for heat treatment that increase the physical and mechanical properties of ready-made castings are presented.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Chen, Yi, Gang Yang, Yi Yang, Kang Sheng Wang, and Chen Guang Lu. "Casting Process and Simulation of K19 Cylinder Block." Applied Mechanics and Materials 602-605 (August 2014): 311–15. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.311.

Повний текст джерела

Анотація:

Cylinder blocks are the most important parts of engine, and their qualities will fundamentally determine the efficiency of engine. In this work, the casting process of K19 engine cylinder block was studied. A casting process was designed and assessed by the numerical software MAGMA to produce cylinder block castings. An actual experiment of casting was carried out and the mechanical properties of the casting were examined. The simulation results show the liquid metal smoothly fills the casting mold and no shrinkage cavity and porosity are formed in the castings. The cylinder block produced by the actual experiment exhibits superior mechanical properties to common ones, which proves the casting process designed is suitable for producing high quality cylinder block castings. The research shows that numerical simulation can provide very useful guidance for the production of castings

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Łągiewka, M., Z. Konopka, M. Nadolski, and A. Zyska. "The Effect of Vacuum Assistance on the Quality of Castings Produced by High Pressure Die Casting Method." Archives of Foundry Engineering 14, no. 2 (June 1, 2014): 23–26. http://dx.doi.org/10.2478/afe-2014-0030.

Повний текст джерела

Анотація:

Abstract The presented work is aimed to deal with the influence of changes in the value of negative (relative) pressure maintained in the die cavity of pressure die casting machine on the surface quality of pressure castings. The examinations were held by means of the modified Vertacast pressure die casting machine equipped with a vacuum system. Castings were produced for the parameters selected on the basis of previous experiments, i.e. for the plunger velocity in the second stage of injection at the level of 4 m/s, the pouring temperature of the alloy equal to 640°C, and the die temperature of 150°C. The examinations were carried on for three selected values of negative gauge pressure: - 0.03, - 0.05, and - 0.07 MPa. The quality of casting was evaluated by comparing the results of the surface roughness measurements performed for randomly selected castings. The surface roughness was measured by means of Hommel Tester T1000. After a series of measurements it was found that the smoothest surface is exhibited by castings produced at negative gauge pressure value of - 0.07 MPa.

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Sadokha, M. A. "Technological features of piston casting." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 4 (December 16, 2020): 64–67. http://dx.doi.org/10.21122/1683-6065-2020-4-64-67.

Повний текст джерела

Анотація:

The results of studies of obtaining complex castings from aluminum alloys using the self-filling method are presented. The influence of a number of technological parameters (pouring time, chill cooling mode, the use of self-filling, etc.) on the quality of the resulting piston castings has been studied. The optimal time for filling the chill mold was determined when casting pistons. It is shown that the chill mold cooling mode has a significant impact on the quality of castings.

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Ruan, Xiao Fang. "Quality Control System for Die Castings Based on Statistic Analysis." Applied Mechanics and Materials 246-247 (December 2012): 918–23. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.918.

Повний текст джерела

Анотація:

Die casting technology is applied widely for mass production of non-ferrous metal parts. How to guarantee the quality of die castings is always a concerned topic. A quality control system for die casting machine was developed based on statistical analysis of technology parameters. Firstly the original data is acquired from die casting machine and the technology curves are displayed. Secondly, the technology parameters are identified automatically and a database of technology parameters is established. Thirdly, a statistical analysis based on the database is performed. The statistics parameters of expecta -tion and deviation are figured out and the probability distribution diagrams for technology parameters are displayed. Finally, Tolerances for technology parameters are figured out and then the system will monitor the die casting process according to the tolerances. A practical system realization in a die casting machine is demonstrated by its monitoring interfaces. Statistical information and on-line monitoring provided by this system are helpful to guarantee the quality of die castings.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Visik, E. M., L. I. Rassokhina, A. B. Echin, and M. V. Gamazina. "Some aspects of improving the quality of GTE cast turbine blades of nickel superalloys." Voprosy Materialovedeniya, no. 4(108) (January 31, 2022): 82–98. http://dx.doi.org/10.22349/1994-6716-2021-108-4-82-98.

Повний текст джерела

Анотація:

The results of the development of casting technology for single-crystal high-pressure turbine blades from nickel superalloys with a crystallographic orientation (CGO) [001] were obtained on an automated casting unit for directional crystallization UVNK-9A, at machine-building enterprise. The construction of the casting blades blocks, technologies for the manufacture of molds, rods and casting of GTE working blades of heatresistant nickel alloys with a single-crystal structure and set-up CGO have been developed under real production conditions on UVNK-9A units substituting through-type furnaces. It is shown that preproduction series of single-crystal castings of working blades with shroud shelf were obtained, with a yield of suitable structure ≥ 75%. The structural-phase characteristics of the alloy of single-crystal blades castings were investigated by scanning electron microscopy in as cast state and after subsequent heat treatment. A comparative quantitative analysis of the microstructure and strength characteristics of supernickel alloy castings with CGO [001], obtained on a high-gradient directional crystallization unit and in a through-type furnace.

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Majernik, Jan, Stefan Gaspar, Jan Kmec, Monika Karkova, and Jozef Mascenik. "Possibility of Utilization of Gate Geometry to Modify the Mechanical and Structural Properties of Castings on the Al-Si Basis." Materials 13, no. 16 (August 11, 2020): 3539. http://dx.doi.org/10.3390/ma13163539.

Повний текст джерела

Анотація:

The mechanical properties of die castings correlate with the inner structure of a casting, distribution of the eutectic phases, and with the content and distribution of porous cavities in the casting volume. This submitted paper deals with the issue of the possibility to influence the basic parameters affecting the quality of castings through structural modifications of the gating system. The structural parameter under assessment is the gate height. In the case of the diverse height of the gate, five sets of castings were produced. The individual sets of castings were subjected to examination of selected mechanical properties, i.e., of permanent deformation and surface hardness. At the same time, the individual sets of castings were subjected to metallographic examination of the eutectic structure of the casting. It was proved that the gate height influences the aforementioned properties of the castings and significantly affects the ratio of the eutectic phases in the volume of the casting. The conclusion describes the mutual correlation between the gate structure, the mechanical properties of the casting, and its structural composition.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Dong, Yi, Xiao Ming Fan, and Bin Liu. "Numerical Simulation and Technology Optimization of Rear Oil Seal Bearing Die Castings Based on ProCAST." Advanced Materials Research 189-193 (February 2011): 4008–13. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.4008.

Повний текст джерела

Анотація:

In production,the Φ105 mm hole of rear oil seal bearing die castings often appear porosity, shrinkage and other defects , resulting in the parts to scrap. The existing gating system design of rear oil seal bearing die castings was improved , and the flow and temperature field of the two programs that before and after improvement were analyzed by ProCAST software. The simulation results predicted the casting defects, and the conclusion was consistent with the production. By using the improved process optimization, the rejection rate of die castings can be reduced effectively. Die casting is a chipless forming of casting with high casting dimensional accuracy, high surface quality and high production efficiency [1,2]. Therefore, it has developed rapidly in the automotive, communications and other industries. However, due to shrinkage, porosity and other reasons, leading to high rejection rate of castings. With the emergence of commercial casting simulation software, the casting production has been developed from semi empirical and semi theoretical onto theorization, quantification and controllable track[3-5]. In this paper, the casting defects of rear oil seal bearing is analyzed by using numerical simulation technology[6]. By optimizing the casting process, the casting quality is improved, and the rejection rate is reduced effectively.

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Gaspar, Stefan, Jan Pasko, and Slavko Pavlenko. "Research on the Impact of Increase Pressure on the Homogeneity of the Cast in Die Casting Technology." Advanced Materials Research 1091 (February 2015): 77–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1091.77.

Повний текст джерела

Анотація:

The production of die castings cast into a metal mold has in recent years achieved an expansive growth in the volume as well as the range of production and that is particularly in aviation and automobile industry. In the process of die casting the final quality of a cast is influenced by a great number of factors. The main factors of die casting are: pressing velocity, increase pressure, the melt temperature and the mold temperature. A primary criterion for achieving reliability, efficiency and quality of production is to ensure minimization of the castings defects occurrence in castings correct setting technological factors of die casting. The presented paper deals with the experimental assessment of the impact of increase pressure on the mechanical properties and homogeneity of a die cast.

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Gaspar, Stefan, and Jan Pasko. "Homogeneity of Aluminum Castings and Dependency on Increasing Pressure." Key Engineering Materials 669 (October 2015): 134–41. http://dx.doi.org/10.4028/www.scientific.net/kem.669.134.

Повний текст джерела

Анотація:

The production of die castings cast into a metal mold has in recent years achieved an expansive growth in the volume as well as the range of production and that is particularly in aviation and automobile industry. In the process of die casting the final quality of a cast is influenced by a great number of factors. The main factors of die casting are: pressing velocity, increase pressure, the melt temperature and the mold temperature. A primary criterion for achieving reliability, efficiency and quality of production is to ensure minimization of the castings defects occurrence in castings correct setting technological factors of die casting. The presented paper deals with the experimental assessment of the impact of increase pressure on the mechanical properties and homogeneity of a die cast.

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Pacana, Andrzej, and Karolina Czerwińska. "Analysis of the causes of control panel inconsistencies in the gravitational casting process by means of quality management instruments." Production Engineering Archives 25, no. 25 (December 1, 2019): 12–16. http://dx.doi.org/10.30657/pea.2019.25.03.

Повний текст джерела

Анотація:

Abstract All castings can have defects caused by, for example, deviations in material characteristics, structure or properties, but the skillful use of available technologies and quality management tools allows for the detection and elimination of casting incompatibilities as well as the prevention of their recurrence in the future. The aim of the article was to analyse the types of defects in castings, locate the areas with the most frequent occurrence of defects and identify the reasons for the presence of defects in castings of the control panel and its cover. The paper presents the usefulness of a combination of quality management instruments for diagnosing material discontinuities in the analyzed castings.

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Eperješi, Š., M. Matvija, ľ. Eperješi, and M. Vojtko. "Evaluation of Cracking Causes of AlSi5Cu3 Alloy Castings." Archives of Metallurgy and Materials 59, no. 3 (October 28, 2014): 1089–92. http://dx.doi.org/10.2478/amm-2014-0187.

Повний текст джерела

Анотація:

Abstract Recently, the castings made from aluminum-silicon alloys by pressure die casting are increasingly used in the automotive industry. In practice, on these castings are high demands, mainly demands on quality of their structure, operating life and safety ensuring of their utilization. The AlSi5Cu3 alloy castings are widely used for production of car components. After the prescribed tests, the cracks and low mechanical properties have been identified for several castings of this alloy, which were produced by low pressure casting into a metal mould and subsequent they were heat treated. Therefore, analyses of the castings were realized to determine the causes of these defects. Evaluation of structure of the AlSi5Cu3 alloy and causes of failure were the subjects of investigation presented in this article.

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Yang, Xiang Jie, Yi He, Yong Bo Zhu, Chuan Lin Hu, Hong Min Guo, Yun Hai Jing, and Guang Bin Yi. "The Study of A356 Alloy Rheo-Squeeze Casting Process." Solid State Phenomena 256 (September 2016): 270–75. http://dx.doi.org/10.4028/www.scientific.net/ssp.256.270.

Повний текст джерела

Анотація:

In this paper, the castings of A356 alloy were made by the rheo-squeeze casting with slurry-making from the process of LSPSF. Experiments were designed to study the influence of three parameters in rheo-squeeze casting process, such as injection speed, mould preheating temperature and injection pressure, on castings performance. The results show that high-quality castings were produced with the injection speed of 0.5m/s ,the mould preheating temperature of 240°C, the injection pressure of 50MPa. The mechanical properties, such as the yield strength, tensile strength and elongation of the castings with T6 heat treatment are 241 MPa, 328MPa and 11.6%, respectively.

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Nadolski, M., Z. Konopka, M. Łągiewka, and A. Zyska. "The Influence of the Method of Mould Filling on the Quality of Castings Made of EN AC-44000 or EN AC-46200 Alloy." Archives of Foundry Engineering 14, no. 4 (December 1, 2014): 73–76. http://dx.doi.org/10.2478/afe-2014-0089.

Повний текст джерела

Анотація:

Abstract The performed examinations concerning the process of filling the plaster ceramic moulds with aluminium alloys allowed to assess the influence of various methods of introducing the metal into the mould cavity on the macro- and microstructure of the obtained experimental castings. The comparison was performed for castings with graded wall thickness made either of EN AC-44000 alloy or of EN AC-46000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting. It was found that the silicon crystals grow in size with an increase in wall thickness due to the slower cooling and solidification of castings

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Pasko, Ján, Stefan Gaspar, and Juraj Ružbarský. "Die Casting Defects of Castings from Silumin." Applied Mechanics and Materials 510 (February 2014): 91–96. http://dx.doi.org/10.4028/www.scientific.net/amm.510.91.

Повний текст джерела

Анотація:

The production of die castings cast into a metal mold has in recent years achieved an expansive growth in the volume as well as the range of production and that is particularly in aviation and automobile industry. A primary criterion for achieving reliability, efficiency and quality of production is to ensure minimization of the castings defects occurrence. For this reason it is necessary to describe the type, scope and frequency of die castings defects and to define the cause of their occurrence.

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Czaplewski, Sarah, Joe Doman, and Joe Kuczynski. "A New Method for Non-Destructive Characterization of Through Holes in Printed Circuit Boards." International Symposium on Microelectronics 2018, no. 1 (October 1, 2018): 000589–95. http://dx.doi.org/10.4071/2380-4505-2018.1.000589.

Повний текст джерела

Анотація:

Abstract Plated through hole (PTH) quality, including plating roughness, is a critical factor in the manufacture of reliable printed circuit boards (PCBs). Currently, cross-sectioning is most commonly used to assess PTH roughness but sectioning is a destructive process and offers a limited view of the PTH. Therefore, a non-destructive casting method using a silicone elastomer was developed to evaluate PTH roughness. Castings were successfully created from PTHs with aspect ratios as high as 22:1 and the castings accurately replicated the microtopography of the plating. Laser scanning microscopy was used to quantitatively measure the surface roughness of the castings which was shown to correlate to current induced thermal cycling (CITC) coupon cycles to failure, a measurement of PTH reliability. Thus, the casting technique can be used to quickly assess PTH quality and its effect on reliability. In addition to plating roughness, it was demonstrated that the casting technique can be used to evaluate back drill quality, PTH diameter along the length of the barrel, as well as drill and desmear processes by casting non-plated through holes.

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Jaworski, J., R. Kluz, and T. Trzepieciński. "Research on Accuracy of Automatic System for Casting Measuring." Archives of Foundry Engineering 16, no. 3 (September 1, 2016): 49–54. http://dx.doi.org/10.1515/afe-2016-0048.

Повний текст джерела

Анотація:

Abstract Ensuring the required quality of castings is an important part of the production process. The quality control should be carried out in a fast and accurate way. These requirements can be met by the use of an optical measuring system installed on the arm of an industrial robot. In the article a methodology for assessing the quality of robotic measurement system to control certain feature of the casting, based on the analysis of repeatability and reproducibility is presented. It was shown that industrial robots equipped with optical measuring systems have the accuracy allowing their use in the process of dimensional control of castings manufactured by lost-wax process, permanent-mould casting, and pressure die-casting.

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Kalyuzhnyy, P. B., S. O. Krotyuk, and M. T. Levchuk. "THE PRODUCTION TECHNOLOGICAL PROCESSES OF STEEL CAST PRODUCTS FOR SHUT-OFF VALVES BY CASTING ON LOST FOAM CASTING." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 1 (April 6, 2018): 22–27. http://dx.doi.org/10.21122/1683-6065-2018-1-22-27.

Повний текст джерела

Анотація:

The peculiarities of technological processes of obtaining steel castings of shut-off valves by lost foam casting are described. It is shown that the dimensional accuracy of the casting «Valve Body DN80» exceeds 7-th accuracy class; the surface quality, mechanical properties and chemical composition of the steel completely meet the customer requirements. The test procedure for leakproofness of shut-off valves castings is given.

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Jelínek, P., and E. Adámková. "Lost Cores for High-Pressure Die Casting." Archives of Foundry Engineering 14, no. 2 (June 1, 2014): 101–4. http://dx.doi.org/10.2478/afe-2014-0045.

Повний текст джерела

Анотація:

Abstract Development of salt cores prepared by high-pressure squeezing and shooting with inorganic binders has shown a high potential of the given technology even for high-pressure casting of castings. Strength, surface quality of achieved castings, and solubility in water become a decisive criterion. The shape and quality of grain surface particularly of NaCl - cooking salts that can be well applied without anticaking additives has shown to be an important criterion. Thus the salt cores technology can cover increasingly growing demands for casting complexity especially for the automobile industry.

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Shopina, E., and M. Markova. "KASLI ART CASTING TECHNOLOGY." Technical Aesthetics and Design Research 2, no. 2 (December 16, 2020): 29–36. http://dx.doi.org/10.34031/2687-0878-2020-2-2-29-36.

Повний текст джерела

Анотація:

The Kasli art casting technology is characterized by its uniqueness; the products are distinguished by precision of execution and uniqueness of style. The Kasli Casting Plant occupies a well-deserved first place in Russia in terms of quality and quantity of products. The object of the research is the features of each of the stages when creating of Kasli castings, as well as the distinctive features of the art casting technology. As a result of the study, the conclusion was formulated that the historical role of Kasli art casting is its influence on the decorative and applied art of Russia. According to the authors, the Kasli plant influenced the further production of castings, producing high-quality products with careful study of details, ensuring a high level of quality for the foundry workers

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Tkachenko, S. S., V. O. Emelyanov, and K. V. Martynov. "Modern technology of investment casting for the production of artistic castings." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 1 (March 26, 2021): 49–52. http://dx.doi.org/10.21122/1683-6065-2021-1-49-52.

Повний текст джерела

Анотація:

The publication describes modern methods of production of fine plastic art castings. The stage of production of the smelted model and development of casting technology is considered. The theoretical basis for obtaining smelted models of a given quality is given. The review of technologies of production of standard castings is presented.

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Zhang, Xiu Mei, Hui Jun Jia, Di Cui, and He Liang. "Numerical Optimization Design on Coating of EPC Steel Casting." Advanced Materials Research 148-149 (October 2010): 707–10. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.707.

Повний текст джерела

Анотація:

Expandable Pattern Casting (EPC) technology has been more and more extensively applied to the production of steel castings in many countries, which brings outstanding economic and social benefits. Applying the best quality coating is one of the key measures to guarantee casting surface quality. Based upon experiments made for many times, the orthogonal experiments of five factors and four levels are adopted to optimize coating working properties and processing properties. Tested by practice, the coating performance indicators of intensity, permeability, coating property, dropping amount and flowing flat property reach a perfect state, which provided a reliability assurance to product sound castings.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Dybowski, B., A. Kiełbus, and R. Jarosz. "Effect of Mould Components on the Cooling Rate, Microstructure, and Quality of We43 Magnesium Casting Alloy/ Wpływ Zastosowanych Elementów Formy Na Szybkość Chłodzenia, Mikrostrukturę I Jakość Stopu Magnezu We43." Archives of Metallurgy and Materials 59, no. 4 (December 1, 2014): 1527–32. http://dx.doi.org/10.2478/amm-2014-0258.

Повний текст джерела

Анотація:

Abstract We investigated the impact of the applied cooling and feeding method on the microstructure and metallurgical quality of castings made from WE43 magnesium alloy. Six identical plates with dimensions of 100x50x20 mm were sand cast for use as samples. Each casting was fed and cooled in a different way. The solid solution grain size was evaluated quantitatively using the Met-Ilo software program, and casting defects were observed using a scanning electron microscope Hitachi S3400N. The finest solid solution grain was observed in the castings with only the coolers applied. Non-metallic inclusions were observed in each plate. The smallest shrinkage porosity was observed in the castings with feeders applied.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Soundharya, T., and N. V. Dhandapani. "Reduction of cost in castings by the method of radiographic test." International Journal of Engineering & Technology 7, no. 2.8 (March 19, 2018): 320. http://dx.doi.org/10.14419/ijet.v7i2.8.10433.

Повний текст джерела

Анотація:

Foundry in developing nations endures from low quality and low output due to the incidence of defects that may occupy single or multiple causes. Hence casting is a process of uncertainty. It is not an easy task, since casting is a complex process and has connections among various process and operations. Casting defects can negatively impact the bottom line of a foundry. Here an attempt is made cost cutback of castings in radiographic test. There are many defects which can be identified through radiographic test and these defects are reduced or remedied by means of welding. This study focuses about the cost reduction of castings by means of “Total quality management tools”.

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Sigworth, G. "Understanding Quality in Aluminum Castings." International Journal of Metalcasting 5, no. 1 (January 2011): 7–22. http://dx.doi.org/10.1007/bf03355504.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Vasková, I., M. Conev, and M. Hrubovčáková. "The Influence of Using Different Types of Risers or Chills on Shrinkage Production for Different Wall Thickness for Material EN-GJS-400-18LT." Archives of Foundry Engineering 17, no. 2 (June 27, 2017): 131–36. http://dx.doi.org/10.1515/afe-2017-0064.

Повний текст джерела

Анотація:

Abstract In modern times, there are increasing requirements for products quality in every part of manufacturing industry and in foundry industry it is not different. That is why a lot of foundries are researching, how to effectively produce castings with high quality. This article is dealing with search of the influence of using different types of risers or chills on shrinkage cavity production in ductile iron castings. Differently shaped risers were designed using the Wlodawer’s modulus method and test castings were poured with and without combination of chills. Efficiency of used risers and chills was established by the area of created shrinkage cavity using the ultrasound nondestructive method. There are introduced the production process of test castings and results of ultrasound nondestructive reflective method. The object of this work is to determine an optimal type of riser or chill for given test casting in order to not use overrated risers and thus increase the cost effectiveness of the ductile iron castings production.

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Aliyev, Elman. "NATIONAL ECONOMIC SIGNIFICANCE UNDER THE CONDITIONS OF THE ECONOMY OF KNOWLEDGE OF CASTING PRODUCTION AND THE KEY DIRECTIONS OF ITS DEVELOPMENT." ETM - Equipment, Technologies, Materials 05, no. 01 (January 20, 2021): 16–20. http://dx.doi.org/10.36962/etm0501202016.

Повний текст джерела

Анотація:

The modern economy is increasingly based on knowledge and, more broadly, on intangible assets that ensure sustainable innovation growth. The formation of an innovative type of knowledge economy can be considered one of the fundamental development trends at the global level. The modernization of the economy in the lifetime period means the introduction of modern technologies, increasing energy efficiency and labor productivity, producing high-quality products according to the most advanced standards. Ultimately, this is the creation of a competitive economy. Keywords: Casting, billet, castings, method of making castings, injection molding, centrifugal casting, investment casting, shell casting, chill casting.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Gašpár, Štefan, Tomáš Coranič, Ján Majerník, Jozef Husár, Lucia Knapčíková, Dominik Gojdan, and Ján Paško. "Influence of Gating System Parameters of Die-Cast Molds on Properties of Al-Si Castings." Materials 14, no. 13 (July 5, 2021): 3755. http://dx.doi.org/10.3390/ma14133755.

Повний текст джерела

Анотація:

The resulting quality of castings indicates the correlation of the design of the mold inlet system and the setting of technological parameters of casting. In this study, the influence of design solutions of the inlet system in a pressure mold on the properties of Al-Si castings was analyzed by computer modelling and subsequently verified experimentally. In the process of computer simulation, the design solutions of the inlet system, the mode of filling the mold depending on the formation of the casting and the homogeneity of the casting represented by the formation of shrinkages were assessed. In the experimental part, homogeneity was monitored by X-ray analysis by evaluating the integrity of the casting and the presence of pores. Mechanical properties such as permanent deformation and surface hardness of castings were determined experimentally, depending on the height of the inlet notch. The height of the inlet notch has been shown to be a key factor, significantly influencing the properties of the die-cast parts and influencing the speed and filling mode of the mold cavity. At the same time, a significant correlation between porosity and mechanical properties of castings is demonstrated. With the increasing share of porosity, the values of permanent deformation of castings increased. It is shown that the surface hardness of castings does not depend on the integrity of the castings but on the degree of subcooling of the melt in contact with the mold and the formation of a fine-grained structure in the peripheral zones of the casting.

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Shinsky, O. I., E. I. Marukovich, I. A. Shalevskaja, V. O. Shinsky, and S. I. Klimenko. "ECONOMY, ECOLOGY, ORGANIZATION OF FOUNDRY PRODUCTION BY LOST FOAM CASTING." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 4 (January 4, 2018): 53–59. http://dx.doi.org/10.21122/1683-6065-2017-4-53-59.

Повний текст джерела

Анотація:

The process of receipt of castings by Lost Foam Casting Process (LFCP) from the point of view of economic efficiency and possibilities of receipt of the high-fidelity and high quality castings with the forecast properties. Indexes of hazardous substances emissions at LFCP are defined, measures to purify are worked out and ecological safety of process is shown.

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Skorulski, G. "3DP Technology for the Manufacture of Molds for Pressure Casting." Archives of Foundry Engineering 16, no. 3 (September 1, 2016): 99–102. http://dx.doi.org/10.1515/afe-2016-0058.

Повний текст джерела

Анотація:

Abstract The paper presents the use of rapid prototyping technology of three dimensional printing (3DP) to make a prototype shell casting mold. In the first step, for identification purposes, a mold was prepared to enable different alloys to be cast. All molds being cast were designed in a universal CAD environment and printed with the zp151 composite material (Calcium sulfate hemihydrate) with a zb63 binder (2-pyrrolidone). It is designated to be used to prepare colourful models presenting prototypes or casting models and molds. The usefulness of 3DP technology for use with copper alloys, aluminum and zinc was analyzed. The strength of the mold during casting was assumed as a characteristic comparative feature in the material resistance to high temperature, the quality of the resulting casting and its surface roughness. Casting tests were carried out in vacuum – pressure casting. The casting programs applied, significantly increased the quality of castings and enabled precise mold submergence. Significant improvement was noted in the quality compared to the same castings obtained by gravity casting.

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Karwiński, A., M. Małysza, P. Wieliczko, A. Gil, and B. Lipowska. "The Use of Innovative Ceramic-Carbon Bonded Filters Used for Filtration of Liquid Alloys and Evaluation of the Filtration Efficiency." Archives of Foundry Engineering 14, no. 3 (August 8, 2014): 29–32. http://dx.doi.org/10.2478/afe-2014-0056.

Повний текст джерела

Анотація:

Abstract Extremely intense development of civilization requires from foundry casting technologies very high quality and not expensive castings. In the foundries, there are many treatments that allow increasing of the final properties of produced castings such as refining, modification, heat treatment, etc. One of the methods of increasing the quality of the casting by removing inclusions from the liquid alloy is filtration. The use of ceramic-carbon foam filters in filtration process is still analysed phenomenon that allows improving the final properties of castings. A modern method of research, testing and synthesis of innovative chemical compositions allows improving the properties of such filters. In the paper the evaluation of application properties of developed ceramic-carbon bonded foam filters is presented. The quality of the foam filters is evaluated by Computer Tomography and foundry trials in pouring of liquid metal in test molds. Additionally computer simulations were made to visualize the flow characteristics in the foam filter. The analysed filters are the result of the research work of Foundry Research Institute and the Institute of Ceramics and Building Materials, Refractory Materials Department in Gliwice.

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Stradomski, G., M. Nadolski, and Z. Stradomski. "Technological Assessment of the Possibility of Making Light-section Castings of GX2CrNiMoN25-6-3 Cast Steel by the Centrifugal Casting Method." Archives of Foundry Engineering 15, no. 3 (September 1, 2015): 57–60. http://dx.doi.org/10.1515/afe-2015-0060.

Повний текст джерела

Анотація:

Abstract The paper presents the results of investigation into the technological possibility of making light-section castings of GX2CrNiMoN25-6-3 cast steel. For making castings with a wall thickness in the thinnest place as small as below 1 mm, the centrifugal casting technology was employed. The technology under consideration enables items with high surface quality to be obtained, while providing a reduced consumption of the charge materials and, as a result, a reduction in the costs of unit casting production.

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Semanco, Pavol, Marcel Fedák, Miroslav Rimár, Peter Skok, and Emil Ragan. "Equation Model of the Cooling Process in High Pressure Die-Casting Technology." Advanced Materials Research 505 (April 2012): 165–69. http://dx.doi.org/10.4028/www.scientific.net/amr.505.165.

Повний текст джерела

Анотація:

In the die-casting technology there is very necessary to determine cooling process of castings in metallic mold especially in the case of castings with great weight to achieve quality surface and properties of the casting without any defects. To regulate cooling in the time course, it is desirable to develop equation of regulation system that determining mold temperature dependence on casting temperature. In the paper we proposed model of regulatory system in the cooling process of casting in a mold that is based on an analysis of amplitude, phase and transition characteristics. The result is presented as proposal for regulatory circuit to control cooling process of casting in the mold.

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Holtzer, M., A. Bobrowski, D. Drożyński, and J. Mocek. "Investigations of Protective Coatings for Castings of High-Manganese Cast Steels." Archives of Foundry Engineering 13, no. 1 (March 1, 2013): 39–44. http://dx.doi.org/10.2478/afe-2013-0008.

Повний текст джерела

Анотація:

Abstract When cast steel castings are made in moulding sands on matrices of high-silica sand, which has a low fire resistance the problem of the so-called chemical penetration is distinctly visible. Whereas this effect appears to a small degree only when moulding sand matrices are of chromite, zircon or olivine sands. Therefore in case of making castings of high-manganese cast steel (e.g. Hadfield steel) sands not containing free silica should be applied (e.g. olivine sand) or in case of a high-silica matrix protective coatings for moulds and cores should be used. Two protective coatings, magnesite alcoholic (marked as coating 1 and coating 2) originated from different producers and intended for moulds for castings of the Hadfield steel, were selected for investigations. Examinations of the basic properties were performed for these coatings: viscosity, thermal analysis, sedimentation properties, wear resistance. In order to estimate the effectiveness of protective coatings the experimental castings were prepared. When applying coating 1, the surface quality of the casting was worse and traces of interaction between the casting material (cast steel) and the coating were seen. When protective coating 2 was used none interactions were seen and the surface quality was better.

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Prikhod’ko, O. G., V. B. Deev, E. S. Prusov, and A. I. Kutsenko. "Influence of thermophysical characteristics of alloy and mold material on castings solidification rate." Izvestiya. Ferrous Metallurgy 63, no. 5 (July 1, 2020): 327–34. http://dx.doi.org/10.17073/0368-0797-2020-5-327-334.

Повний текст джерела

Анотація:

Obtaining castings of given quality is the main task of foundry production. One of the stages of casting technology is solidification of melt in the mold. When studying the process of castings solidification, it is necessary to fully take into account all the features of heat transfer between casting and mold. Influence of various thermophysical parameters of alloy and mold material on casting formation is considered. In the analysis, original mathematical models were used to calculate the coefficient and time of complete solidification of castings in sand-clay and metal forms. These models take into account geometric parameters of casting, main thermophysical parameters of casting metal and mold material, heat transfer conditions at crystallization front, on casting-mold boundary and on the mold surface. Analysis of dependence of time and rate of castings solidification on thermophysical parameters (heat capacity, density, heat conductivity of casting material and mold, specific heat of metal crystallization) was carried out. Storage capacity and process of heat storage are quite fully characterized by the value of heat storage coefficient. This coefficient practically determines the rate of heat loss by the casting which plays a decisive role in its properties forming. Therefore, this parameter is selected for a comprehensive analysis of thermal processes occurring in casting and mold. The influence of thickness and thermal conductivity of chill paint layer on solidification of castings in metal molds is considered. The basic calculation formulas and initial data are presented. Calculations were carried out for castings of the following types: endless plate, endless cylinder, ball. The results of simulation of solidification process parameters are presented in graphic form. Using various alloys as an example, it has been shown by calculation that when changing composition and properties of mold material, it is possible to change time and speed of alloys solidification in a wide range. In this case, processes of forming the structure and properties of castings are controlled.

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Huang, Pei Hsing, Wei Jen Wu, and Chung Han Shieh. "Numerical Simulations of Low Pressure Die-Casting for A356 Aluminum Rims." Materials Science Forum 893 (March 2017): 276–80. http://dx.doi.org/10.4028/www.scientific.net/msf.893.276.

Повний текст джерела

Анотація:

This study conducted mold flow analyses on low pressure die-casting A356 aluminum rims to improve the shrinkage and porosity defects which usually occurs in die-castings so as to enhance the quality of die-casting wheels. We adopted different lift tube designs with cylindrical, taper opening and back taper opening structures while discussing the filling, exhaust, and solidification of molten flows and predicting the shrinkage and porosity formed based on the retained melt modulus. The study found that the configuration of lift tube as well as the optimization of process parameters such as the processing pressure and progressive time could effectively reduce the formations of shrinkage and porosity defects and improve the quality of die-castings.

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Manjunath Patel, G. C., B. S. Ajith, R. Jonathan, D. S. Allan, M. Aniruddh, and M. Ashwith. "Teaching learning based optimization of squeeze casting process for quality castings." IOP Conference Series: Materials Science and Engineering 376 (June 2018): 012112. http://dx.doi.org/10.1088/1757-899x/376/1/012112.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Ignaszak, Z., and J. Hajkowski. "Contribution to the Identification of Porosity Type in AlSiCu High-Pressure-Die-Castings by Experimental and Virtual Way." Archives of Foundry Engineering 15, no. 1 (March 1, 2015): 143–51. http://dx.doi.org/10.1515/afe-2015-0026.

Повний текст джерела

Анотація:

Abstract The paper concerns the problem of discontinuity in high pressure die castings (HPDC). The compactness of their structure is not perfect, as it is sometimes believed. The discontinuities present in these castings are the porosity as follow: shrinkage and gas (hydrogen and gas-air occlusions) origin. The mixed gas and shrinkage nature of porosity makes it difficult to identify and indicate the dominant source. The selected parameters of metallurgical quality of AlSi9Cu3 alloy before and after refining and the gravity castings samples (as DI - density index method), were tested and evaluated. This alloy was served to cast the test casting by HPDC method. The penetrating testing (PT) and metallographic study of both kinds of castings were realized. The application of the NF&S simulation system allowed virtually to indicate the porosity zones at risk of a particular type in gravity and high-pressure-die-castings. The comparing of these results with the experiment allowed to conclude about NF&S models validation. The validity of hypotheses concerning the mechanisms of formation and development of porosity in HPDC casting were also analyzed.

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Quality of castings"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями