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Littérature scientifique sur le sujet « Moulding process »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Moulding process"

Pick, Louise, Paul R. Hanna et Luke Gorman. « Assessment of processibility and properties of raw post-consumer waste polyethylene in the rotational moulding process ». Journal of Polymer Engineering 42, n^o 4 (7 février 2022) : 374–83. http://dx.doi.org/10.1515/polyeng-2021-0212.

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Abstract This paper presents work from an ongoing study into the use of post-consumer waste polymer in the rotational moulding process. Raw plastic recyclate, predominantly consisting of polyethylene, was processed into polymer powders containing an additive package suitable for rotational moulding, with and without the addition of a compatibiliser. Rheological studies on the materials showed very high viscosities at low shear rates in comparison with materials typically used in rotational moulding, which has significant implications for melt flow and bubble removal during the process. It was possible to mould the materials successfully, but poor surface finishes were achieved. Impact strength was drastically lower for recyclate mouldings compared with virgin material. Tensile strength of the recyclate mouldings was reduced compared to virgin polyethylene, but results indicated that optimising the processing conditions could lead to improvements. This work gives some baseline indicators to inform further planned work on optimising processing conditions and identifying viable material compositions.

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Knitter, R., W. Bauer et D. Göhring. « Microfabrication of ceramics by rapid prototyping process chains ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 217, n^o 1 (1 janvier 2003) : 41–51. http://dx.doi.org/10.1243/095440603762554604.

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Most shaping processes for ceramics are based on a powder technological moulding process using a negative mould and subsequent thermal compaction. Especially for prototypes and small-lot series of microcomponents, the outlay for moulds is the major costing factor. Therefore the use of rapid prototyping (RP) processes can decisively reduce the costs and time in product development of ceramic microcomponents. By combining the high resolution of, for example, stereolithography as an inexpensive and fast supply for master models with the high flexibility of low-pressure injection moulding, a rapid prototyping process chain (RPPC) has been established for the fabrication of micropatterned ceramic components as functional models or pre-production lots. This RPPC proved to have a very high moulding precision and accuracy in the submillimetre range, but also enables the fabrication of components with outer dimensions of several centimetres. Different RP techniques were investigated with regard to their suitability to be used as master models in the replication chain. The quality of the master models turned out to be of decisive significance for the quality and reproducibility of the ceramic mouldings.

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Singh, Gurjeet, Mohan Kumar Pradhan et Ajay Verma. « A Review of the Effect of Process Parameters on the Performance of Plastic Injection Molding Process to Control the Warpage in Plastics ». Materials Science Forum 830-831 (septembre 2015) : 116–19. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.116.

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Quality control is important aspect of manufacturing process. The quality of product in injection moulding is influenced by injection moulding process parameter. A study of the influence of process parameters on the injection moulding process is presented. Statistically based model approach were studied. In this the process parameter that affect the injection moulding process are like injection time, injection pressure, packing pressure, packing time, cooling time, coolant temperature mold temperature, melt temperature are studied and compared. This paper deals with design of experiment approach to fine out optimal parameter setting. The comparison shows effect of parameters on injection moulding process.Key words: Plastic injection moulding, Orthogonal array, Cycle time

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Pfleging, W., T. Hanemann, M. Torge et W. Bernauer. « Rapid fabrication and replication of metal, ceramic and plastic mould inserts for application in microsystem technologies ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 217, n^o 1 (1 janvier 2003) : 53–63. http://dx.doi.org/10.1243/095440603762554613.

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The process strategy for the rapid fabrication of microcomponents made of polymers will be presented. Different fabrication routes have been developed at Forschungszentrum Karlsruhe GmbH within the microsystem technology programme focusig on replication techniques. Single prototypes can be generated by the direct patterning of plastics with excimer laser radiation. For the fabrication of very small series laser-assisted micromachining, neodymium-doped yttrium aluminium garnet (Nd:YAG) and krypton fluorine (KrF) excimer laser radiation allows for the rapid manufacturing of microstructured mould inserts made of plastics, steel, cemented carbide or ceramics. The applied mould insert material depends on the achievable low surface roughness values essential for the subsequent moulding process. Plastic replication such as hot embossing, injection moulding or reaction injection moulding of the generated microstructured mould inserts gives access to mouldings carrying structural details in the micrometre range and/or high aspect ratio microstructures.

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Yanev, A. S., Gustavo R. Dias et António M. Cunha. « Visualization of Injection Moulding Process ». Materials Science Forum 587-588 (juin 2008) : 716–20. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.716.

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A special tool-transparent mould designed to visualize the melt flow inside the cavity is used in this research. The aim of the work is to assess the polymer melt behavior under different processing conditions-close to industrial, in conventional and two materials non-conventional injection moulding techniques. The mould is designed with two injection locations and has possibility to change the geometry of the cavity in order to investigate the melt behavior in differently shaped cavities. Visual access in the mould is allowed by the sapphire windows, surrounding the cavity. For image acquisition a high speed video camera NAC 1000 is used. Materials used in the research are three polypropylenes with different flow index. Results are obtained for conventional injection moulding, two material monosandwich and two material biinjection moulding. Apart from visualization, instrumentation of the mould allows to be obtained PT data for each processing condition. Results from conventional injection moulding are compared with MPI5.0 simulations.

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Chuankrerkkul, Nutthita, Yuttanant Boonyongmaneerat, Kanokwan Saengkiettiyut, Pranee Rattanawaleedirojn et Sawalee Saenapitak. « Injection Moulding of Tungsten Carbide-Nickel Powders Prepared by Electroless Deposition ». Key Engineering Materials 545 (mars 2013) : 148–52. http://dx.doi.org/10.4028/www.scientific.net/kem.545.148.

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Tungsten carbide with nickel (WC-Ni) is generally used in applications in which high wear and corrosion resistance are required. In most cases, WC is mixed with Ni powder through a powder-processing route. In the present study, an electroless deposition technique was employed in order to prepare Ni coated WC particles prior to forming specimens by powder injection moulding method. The starting WC powders were subjected to surface activation followed by electroless Ni coating. The effects of a variety of processing parameters, including coating time and powder to electrolyte content ratio, were examined. The characteristics of the prepared powders were assessed by scanning electron microscopy and laser particle size analysis. It has been found that the fabrication of WC powder coated with Ni can be achieved through the electroless deposition technique. The amount of Ni introduced to the WC particles can be controlled by the powder to electrolyte content ratio and the deposition duration. The use of small particle loadings can ensure relatively large deposition and uniformity of the coatings. It is widely known that powder injection moulding (PIM) is an effective process for fabrication of small and complex shaped components of high performance materials. The PIM process includes 4 main steps: feedstock preparation, injection moulding, debinding and sintering. In this work, the WC-Ni powders were mixed with polyethylene glycol (PEG) and polymethyl methacrylate (PMMA) binder to form feedstock for injection moulding. The injection moulding process was carried out by a laboratory scaled, plunger-type machine. The mouldings were subjected to debinding and sintering. It was found that the PEG could be removed by water leaching. Specimens retained their shapes during and after leaching of the PEG. The remaining binder could be removed through pyrolysis. The mouldings were sintered under vacuum at 1400 °C for 1 hour. The sintered density achieved was at 88% of the theoretical value due to the low powder loading employed in the study.

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HIRAI, Mitomo, Tsuneo HIRAI, Tsutao KATAYAMA et Takeshi ISHIKAWA. « Deformation Analysis of Box Shape Injection Mouldings in Consideration of Moulding Process. » Journal of the Society of Materials Science, Japan 42, n^o 475 (1993) : 359–63. http://dx.doi.org/10.2472/jsms.42.359.

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Chuankrerkkul, Nutthita, Pat Sooksaen, Piyawan Pakunthod, Tutiyachan Kosalwit et Wanwara Pinthong. « Powder Injection Moulding of Alumina Using PEG/PVB Binder Systems ». Key Engineering Materials 545 (mars 2013) : 173–76. http://dx.doi.org/10.4028/www.scientific.net/kem.545.173.

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Powder injection moulding (PIM) is a process that is suitable for a fabrication of small and complex shape components. It consists of 4 main steps: feedstock preparation by mixing powder and binder, injection moulding of the prepared feedstock into the desired mould, removal of the binder and finally sintering to obtain materials with specific properties. In this study, powder injection moulding of alumina (Al2O3), using polyethylene glycol (PEG) based binder systems, was investigated. PEG is soluble in water; therefore, the use of organic solvents required for debinding of wax-based binder system can be avoided. PEG with a molecular weight of either 1500 or 4000 was used as a major constituent together with polyvinyl butyral (PVB) as a minor component. Stearic acid was also added during feedstock preparation to act as a lubricant. After mixing the powder with the binder, a variety of Al2O3 feedstocks were injected into the moulds. The mouldings were prepared by a laboratory-scaled plunger-typed machine. Debinding was carried out using a combination of solvent extraction and thermal debinding. Water leaching tests were performed at 30 and 50 °C to study PEGs removal rate. The pyrolysis of PVB was completed during ramping up of the mouldings to the sintering temperature. The mouldings were subjected to sintering at 1500 °C in air. It was found from the study that PEG/PVB binder systems can be used for the preparation of alumina powder injection moulding feedstocks. Specimens retained their shapes during and after leaching of the PEGs.

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Palutkiewicz, Pawel. « Computer simulations of cellular injection moulding process ». Polimery 60, n^o 02 (février 2015) : 132–43. http://dx.doi.org/10.14314/polimery.2015.132.

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Dobosz, S. M., K. Major-Gabryś et M. Hosadyna. « New Look at the Process of Reclamation of Moulding Sands ». Archives of Foundry Engineering 12, n^o 3 (1 septembre 2012) : 19–24. http://dx.doi.org/10.2478/v10266-012-0075-0.

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Abstract This paper presents a new perspective on the issue of reclamation of moulding and core sands. Taking as a premise that the reclamation process must remain on the surface of grains some not separated binding materials rests, it should be chosen the proper moulding sand’s composition that will be least harmful for the reclaim quality. There are two different moulding and core sands taken into examinations. The researches prove that a small correction of their compositions (hardener type) improves the quality of the received reclaims. Carried out in this article studies have shown that such an approach to the problem of reclamation of the moulding and core sands is needed and reasonable.

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Thèses sur le sujet "Moulding process"

Scholz, Steffen Gerhard. « Micro injection moulding : process monitoring and optimisation ». Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/14054/.

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The advances in micro engineering and especially micro products and micro components with functional micro and nano structures / features are directly dependent on the advances in manufacturing technologies for their scale up production. Micro injection moulding is one of the key technologies for cost affective serial production of micro components. In this thesis, the process capabilities and constraints of this technology were studied systematically. More specifically, new tool making process chains and various process factors affecting the micro injection moulding process were investigated. The manufacturing capabilities of this technology were further analysed by investigating the filling behaviour of micro cavities, the influence of air in micro cavities and the forces occurring during the demoulding stage. Chapter 2 of this thesis reviews the slate of the art in micro tooling and micro injection moulding. In Chapter 3 an advanced condition monitoring system was developed to better understand the behaviour of the injection moulding process. In particular, cavity pressure sensors were utilised to analyse interdependences between process conditions and key characteristics of cavity pressure curves. Chapter 4 investigates the influence and effects of air inside micro cavities. A design of experiments’ study was carried out to identify process settings for achieving an optimum filling of micro cavities In particular the flow length inside the cavity was investigated to judge about the process performance. Next, the demoulding stage of the injection moulding cycle was studied in Chapter 5. In particular, ejection forces were analysed to investigate the influence of different process settings on demoulding behaviour of polymer parts. This is especially important in order to avoid any part damage during demoulding. In Chapter 6 micro stereolithography was used to fabricate mould inserts for micro injection moulding. Experiments were carried out with such mould inserts, and the tool life in relation to process settings for both the manufacture of the inserts and their replication performance, was studied systematically. Finally, Chapter 7 summarises the main conclusions and contributions to knowledge of this research. Also, future research directions in the area of micro injection moulding are proposed and briefly discussed The main findings of this research can be summarised as follows: • Indirect measurement methods can be utilised to monitor cavity pressure conditions in micro injection moulding and it was shown that Pmax, Pwork and Prate were dependent on the materials and processing conditions. • The performance of the u-IM process can be improved by understanding the effects of V1 and air evacuation on Qmax, Q, and the part flow length. High u-IM process settings and a limited venting through the primary split line have a significant impact on the filling performance. The u-IM process performance can be improved by incorporating secondary vents and by applying vacuum methods for air evacuation. • Pmax, Pwork and Fe max were dependent on the processing conditions and there is a direct correlation between cavity pressure and demoulding force. The position of the pressure sensors is important, but the readings of both sensors correlate. The holding pressure has the highest impact on the maximum demoulding forces. Rapid tooling can be applied successfully in u-IM and offers a faster, cheaper and highly flexible manufacturing route for producing prototypes in the final material. Only the uSL inserts produced with a layer thickness of 20 um (less undercuts) survived during the demoulding stage. The best results were achieved with PP, followed by PC. ABS polymer parts couldn’t be replicated successfully.

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Corrigan, N. E. « Development of the reactive rotational moulding process ». Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273426.

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Griffiths, Christian Andrew. « Micro injection moulding : tooling and process factors ». Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54854/.

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The development of new micro devices is highly dependent on manufacturing systems that can reliably and economically produce micro components in large quantities. Micro injection moulding is one of the key technologies for micro-manufacture and is considered as a cost effective replication method for mass production. The capabilities of this replication technology have to be studied systematically in order to determine the process constraints. The present work concerns the tooling and process factors that influence micro injection moulding. The requirements of this manufacturing process are identified, and a review of the current state of the art in the field, Chapter 2, is used to assess the potential of this technology. To analyse further the manufacturing capabilities of this technology against the requirements, an investigation of the pre-filling, filling and part removal stages of the process cycle is conducted. In particular, in Chapter 3 the pre-filling capabilities of multi cavity micro tools with the use of a runner system is explored. The filling performance of spiral-like micro cavities was studied as a function of runner size in combination with selected process factors. Then, in Chapter 4 the filling of micro mould cavities with controlled tool surface finishes is investigated. Factors affecting the flow behaviour are discussed and a special attention is paid to the interaction between the melt flow and the tool surface roughness. Using the same part design as that of the tool surface finish investigation, in Chapter 5 a Finite Element Analysis (FEA) is used to verify the effects of process parameters, particularly the factors affecting shear rate, pressure and temperature. The results of this investigation were then compared with those reported in the experimental study. Finally, in Chapter 6 the application of micro mould surface treatments is analysed. The effects of different surface treatments on the de-moulding of parts with micro features are investigated to identify the best processing conditions in regards to de-moulding behaviour. To validate the process effects for these three process stages micro injection moulding experimental set-ups were specially designed and implemented. These experiments apply various part designs, tool-making techniques, process factors, part inspection and condition monitoring techniques, and FEA. To further understand the importance of process characteristics at the micro scale, an in depth analysis of the experimental results for each of the selected investigations was carried out. Finally, in Chapter 7 the results from each of the investigations are summarised, and the main research findings identified, in particular the influence of runner size on the process performance, tool surface finish effects on the filling process, the accuracy and sensitivity of the proposed FEA model, and the effects of tool surface treatment on part de-moulding.

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Correia, Nuno André Curado Mateus. « Analysis of the vacuum infusion moulding process ». Thesis, University of Nottingham, 2004. http://eprints.nottingham.ac.uk/12762/.

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This thesis focuses on flow through compliant porous media with applications to the manufacturing of composites by vacuum infusion (VI). The context of this work is the need for reliability in environmentally friendly composite processing methods for composite materials. Commercial reality and the prospective application to low cost structures for the transportation industry dictate that appropriate emphasis should be put on obtaining robust simulations, ensuring reliability and progressing toward efficient means of process control. In this context, the open mould manufacturing processes which have been used to produce large composite structures, and are not conducive to quality nor environmental responsibility, must be replaced. Hence, establishing composites as a viable alternative requires closed moulding techniques, of which VI is the most practical for large structures, but where reliability is required for economic survival. This work addresses many aspects of this problem, by making innovative use of fluid mechanics and developing, implementing and proposing new analysis and modelling tools for VI. Main results include a validated analytical model for flow through compliant media, a study of the compliance of textile reinforcements, a finite element model for VI and novel stochastic techniques for the analysis of reliability in liquid composite moulding processes. The work discussed herein stems from a thorough evaluation of published models and leads to novel flow modelling tools for VI including a unique and general formalism for textile compliance. Using these tools it was possible to study, for the first time, the effect of different parameters on VI manufacturing. The reliability issue was addressed by integrating stochastic models for compliance and permeability, and the ability to model complex geometries was demonstrated by adapting a commercial finite element flow code (LIMS).

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Bon, Abdul Talib. « Process quality improvement on beltline moulding manufacturing ». La Rochelle, 2008. http://www.theses.fr/2008LAROS239.

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Le monde industriel de fabrication d'aujourd'hui doit satisfaire la demande des utilisateurs finaux et l'un des facteurs déterminants est la demande des produits de haute précision. Plusieurs stratégies ont été employées par les fabricants pour réduire le nombre des défauts et prédire la précision des processus de fabrication. L'approche de l'amélioration de contrôle de qualité, implémentée dans cette étude, comprend la mise en place des paramètres et l'optimisation pour le processus de la moulure des ceintures de caisse afin de réduire la durée de la prise et le nombre des défauts. Nous avons développé de nouvelles techniques dans la sélection des paramètres et l'optimisation, dans lesquelles nous utilisons deux techniques statistiques qui sont notamment l'optimisation d'essaim de particules et l'algorithme génétique. Les techniques de prévisions ARIMA développées au cours de cette étude pourraient devenir un outil d'interprétation des données plus supérieur que la méthodologie traditionnelle existante. Les résultats de cette étude serviront d'évidences utiles dans l'applicabilité de l'implémentation de la méthodologie de la moulure des ceintures de caisses proposée aux fabricants
The world of manufacturing industries is forced to meet the demand of the end users and one of the factors is highly quality demand from customer and highly precise products have determined by manufacturing systems. Many strategues from manufacturer already did how to reduce the number of defected and forecast the manufacturing process to more accurate. Process Quality Improvement approach was introduced and implemented in this study. Which is a parameter setting and optimization for beltline moulding process have developed and optimized to both shorten setting time and reduce number of detect procedures. We developed new techniques in parameter selection and optimization which is we apply a statistical techniques, Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) approach in this study. The ARIMA forecasting techniques developed for this study can forecast, and can become superior to traditional methodology where interpretation is needed. The findings from the study will serve as a useful evidence and applicability of the proposed methodology to beltline moulding manufacturer for implementation

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Vietri, Umberto. « Intelligent monitoring of the injection moulding process ». Doctoral thesis, Universita degli studi di Salerno, 2011. http://hdl.handle.net/10556/1602.

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2009-2010
The quality requirements of injection-moulded components have become more stringent because of the growing s applications of plastics and increasing customer demands. The quality of the moulded parts depend on the processing conditions and this creates a continuous demand for developing advanced techniques for monitoring and controlling the process The current practice in industry is to adjust the parameters based on the product defects through trial and error, starting from information from the material supplier, mould designer, and, largely, on the basis of the moulding engineer’s (or setup person’s) own experience. Nevertheless, defects can occur in moulded parts due to, for instance, the variation in material properties (particularly when reground or biodegradable resins are used), the change in environmental conditions (e.g., humidity or temperature in the surroundings), and the machine characteristics (particularly those using hydraulic power). In this case, the process conditions have to be readjusted in order to re-establish the part quality targets. To overcome these difficulties, injection moulding quality control has been the subject of many off-line and on -line quality control studies. The purpose is to achieve automatic and adaptive quality control able to guarantee a stable and repeatable process, from the part quality point of view.[edited by author]
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Somnuk, Peerawat. « Experimental study of simultaneous co-injection moulding process ». Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308577.

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De, Kock Willem Johan. « Numerical simulation of the plastics injection moulding process ». Doctoral thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/18307.

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The Hele-Shaw formulation is widely used for the simulation of the injection moulding process. The influence of the Hele-Shaw approximations is, however, unknown. A two-dimensional numerical model based on the Hele-Shaw formulation, and a model based on the Navier-Stokes equations without the Hele-Shaw approximations were developed. The solutions obtained with these two approaches were compared to investigate the influence of the Hele-Shaw approximations on the simulation of the injection moulding process. Weakly compressible, non-Newtonian flow of an amorphous polymer melt under non-isothermal conditions were simulated using constitutive equations generalized to non-Newtonian materials. The finite volume method, which is a very powerful method yet easy to use, was used to discretize the governing equations as compared to finite element methods used in most other reported models. The influence of the Hele-Shaw approximations on the solutions of specific flow cases was determined by comparing the solutions obtained with the model based on the Hele-Shaw formulation and the model based on the Navier-Stokes equations. Parametric studies were done to compare the solutions of the two numerical models for a wider range of flow cases. The following conclusions were made as a consequence of this study: Numerical models to simulate the injection moulding process can be simplified and the computer time required to solve these models can be reduced by using the Hele-Shaw formulation instead of solving the full Navier-Stokes equations. Numerical models based on the Hele-Shaw formulation are well suited to simulate the injection moulding process when the geometries and flow conditions fall within certain limits. These limits are determined by the combined effect of the geometry and the flow conditions represented by the Reynolds number. The simplicity of the finite volume method used in the generalized Hele-Shaw model makes it an attractive model to use for injection moulding simulations.

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Zhiltsova, Tatiana Vladimirovna. « Injection moulding process optimization for microstructured parts production ». Doctoral thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12059.

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Doutoramento em Engenharia Mecâncica
Ao longo das últimas décadas, a micromoldação (u-moldação) por injeção de termoplásticos ganhou um lugar de destaque no mercado de equipamentos eletrónicos e de uma ampla gama de componentes mecânicos. No entanto, quando o tamanho do componente diminui, os pressupostos geralmente aceites na moldação por injeção convencional deixam de ser válidos para descrever o comportamento reológico e termomecânico do polímero na microimpressão. Por isso, a compreensão do comportamento dinâmico do polímero à escala micro bem como da sua caraterização, análise e previsão das propriedades mecânicas exige uma investigação mais alargada. O objetivo principal deste programa doutoral passa por uma melhor compreensão do fenómeno físico intrínseco ao processo da μ-moldação por injeção. Para cumprir com o objetivo estabelecido, foi efetuado um estudo paramétrico do processo de μ-moldação por injeção, cujos resultados foram comparados com os resultados obtidos por simulação numérica. A caracterização dinâmica mecânica das μ-peças foi efetuada com o objetivo de recolher os dados necessários para a previsão do desempenho mecânico das mesmas, a longo prazo. Finalmente, depois da calibração do modelo matemático do polímero, foram realizadas análises estruturais com o intuito de prever o desempenho mecânico das μ-peças no longo prazo. Verificou-se que o desempenho mecânico das μ-peças pode ser significativamente afetado pelas tensões residuais de origem mecânica e térmica. Estas últimas, resultantes do processo de fabrico e das condições de processamento, por isso, devem ser consideradas na previsão do desempenho mecânico e do tempo de serviço das u-moldações.
Over the last decades, microinjection moulding (uIM) of thermoplastics has gained a pertinent place on the market of electronic equipment and a broad range of the mechanical aids. However, when size of components drop to the micro level, the assumptions of the conventional injection moulding cease to describe the complex rheological and thermo-mechanical behavior of the polymer in the microimpression. Therefore, understanding of the polymer flow dynamics at the micro scale as well as characterization, assessment and prediction of the final mechanical properties require a great deal of additional research. The prime objective of this doctoral thesis is to get an insight into the physical phenomena inherent to μIM process. In order to comply with the established objective, a number of parametrical studies of the μIM process were carried on an instrumented micromould and then their results were compared with the obtained numerical simulation results gathered from process modeling phenomena. Dynamical mechanical characterization of μ-moulded parts was performed in order to collect the data required for prediction of their long-term mechanical performance. Finally, after calibration of polymer material model, a long-term transient structural analysis was carried out. It was found out that the structural performance of microparts was significantly affected by the thermo-mechanical (residual) stresses. The latter is an inherent feature of the injection moulding processing, and therefore has to be accounted for the prediction of the u-moulded parts’ service life.

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Schiffers, Reinhard, Georg P. Holzinger et Gernot Huster. « Adaptive process control for stabilizing the production process in injection moulding machines ». Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200201.

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Plastic injection moulding machines are a positive example of the possibilities in terms of performance and energy efficiency of modern hydraulic drives technology. In addition to the performance and energy efficiency of the machines, the quality of the plastic mouldings and an easy to use machines control is the focus. To ensure a constant plastics part quality the set process parameters of the injection moulding machines are kept constant by appropriate closed loop control strategies today. Assuming a constant quality of the processed plastic raw material, this strategy is effective. If it comes to a qualitative variation in the processed plastics, which often leads to a change in viscosity of the plastics melt, keeping processing parameters constant will not lead to a constant quality of the moulded parts. The deviations in the plastics viscosity have such a great influence on the moulding process that the relevant process parameters have to be adjusted manually in many cases. Often the stroke of the reciprocating screw system has to be adapted to reach a constant filling volume of the cavity and therefore avoid burr formation or short shots. In this paper an approach for adaptive process control is introduced. This control loop is able to correct the set points of specific machines parameters online within the production cycle and therefore is able to avoid changes in the produced parts quality.

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Livres sur le sujet "Moulding process"

Somnuk, Peerawat. Experimental study of simultaneous co-injection moulding process. [s.l.] : typescript, 1995.

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Large, K. R. Design of a novel cavity wall blow moulding process. Manchester : UMIST, 1990.

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Sombatsompop, Narongrit. The characteristics of flowing polymer melts in the injection moulding process. Manchester : UMIST, 1997.

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Ozolins, Christopher. Development of an injection and moulding subsystem for a microcellular plastic manufacturing process. Ottawa : National Library of Canada, 2001.

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Cutri, Francesco Angelo. Production enhancement in the planing and spindle moulding process utilising a mechatronic approach. Leicester : Leicester Polytechnic, 1991.

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Barnett-Ritcey, Dwayne. Powder injection moulding (PIM) : A special report by the Industrial Research and Development Institute to assist companies in the evaluation of this state of the art manufacturing process. [Midland, Ont.] : The Institute, 1997.

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Vannessa, Goodship, Arburg (Firm) et Rapra Technology Limited, dir. Practical guide to injection moulding. Shawbury : Rapra Technology, 2004.

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Ozden, Sedat. Influence of process-induced stresses on the mechanical behaviour and dimensional stability of thermoplastic injection mouldings. [s.l : The Author], 1994.

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Garcia-Jejon, Andreas. Advances in Blow Moulding Process Optimization (Rapra Review Reports). Rapra Technology Ltd, 1995.

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Salser, Hai. Plastic Injection Moulding Raw Materials : What Are the Types of Injection Moulding ? : Plastic Injection Molding Process Steps. Independently Published, 2021.

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Plus de sources

Chapitres de livres sur le sujet "Moulding process"

Räckers, Bernd, Chris Howe et Teresa Kruckenberg. « Quality and process control ». Dans Resin Transfer Moulding for Aerospace Structures, 434–55. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4437-7_13.

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Morton-Jones, David H., et John W. Ellis. « PST 6 : The Blow-Moulding Process ». Dans Polymer Products, 252–54. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4101-4_22.

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Wortberg, Jonannes, et Mahmud Al-Haj Mustafa. « Model Based Approaches for Closed-Loop Quality Control in Injection Moulding ». Dans Process Modelling, 421–37. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60120-0_28.

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Latt, Jonas, Guy Courbebaisse, Bastien Chopard et Jean Luc Falcone. « Lattice Boltzmann Modeling of Injection Moulding Process ». Dans Lecture Notes in Computer Science, 345–54. Berlin, Heidelberg : Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30479-1_36.

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Ribeiro, Inês, Paulo Peças et Elsa Henriques. « Assessment of Energy Consumption in Injection Moulding Process ». Dans Leveraging Technology for a Sustainable World, 263–68. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29069-5_45.

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Nabiałek, Jacek, et Tomasz Jaruga. « Numerical Modeling of MuCell® Injection Moulding Process ». Dans Lecture Notes in Mechanical Engineering, 434–47. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16943-5_37.

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Veeresh Nayak, C., G. C. Manjunath Patel, M. R. Ramesh, Vijay Desai et Sudip Kumar Samanta. « Analysis and Optimization of Metal Injection Moulding Process ». Dans Materials Forming, Machining and Tribology, 41–74. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18854-2_2.

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Stanko, Michael, et Markus Stommel. « Digital Twin of the Polyurethane Rotational Moulding Process ». Dans Advances in Polymer Processing 2020, 324–35. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60809-8_27.

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Ali, Noorfa Idayu Mohd, Mohd Amran Md Ali, Shajahan Maidin, Mohd Amri Sulaiman, Mohd Shukor Salleh et Mohd Hadzley Abu Bakar. « Review on Experimental Design, Process Parameters and Responses of Compression Moulding Process ». Dans Lecture Notes in Mechanical Engineering, 407–14. Singapore : Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8954-3_38.

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Sitters, C. W. M., et J. F. Dijksman. « On the Mathematical Modelling of the Injection Moulding Process ». Dans Integration of Fundamental Polymer Science and Technology, 361–66. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4185-4_53.

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Actes de conférences sur le sujet "Moulding process"

Skipper, Richard S., et David W. Shepherd. « Moulding process for contact lens ». Dans San Diego, '91, San Diego, CA, sous la direction de Colin M. Perrott. SPIE, 1991. http://dx.doi.org/10.1117/12.50477.

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Hidayah, M. H. N., Z. Shayfull, S. M. Nasir, M. Fathullah et M. H. M. Hazwan. « Warpage analysis in injection moulding process ». Dans 3RD ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2017 (EGM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5002244.

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Seo, Jaho, Amir Khajepour, Jan P. Huissoon et Young-Jun Park. « On-Line Thermal Control for Injection Moulding Process ». Dans ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12570.

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Thermal control is a key issue for injection moulding process due to its effects on production quality and rate. In this study, an on-line thermal control strategy is provided for effective thermal management in plastic injection moulding process. The strategy covers for methods in determining sensor locations as a prerequisite step for modeling and control, identifying a thermal dynamic model of a mould with uncertainties and designing a cavity wall temperature controller. A verification of the designed controller’s performance is carried out from the viewpoints of accuracy in on-line temperature tacking and response time under different injection moulding process with various cycle-times.

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Surace, Rossella, Gianluca Trotta, Alessandro Bongiorno, Vincenzo Bellantone, Claudia Pagano et Irene Fassi. « Micro Injection Moulding Process and Product Characterization ». Dans ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48301.

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Due to its high efficiency for the large scale production of polymeric parts, micro injection moulding is one of the key technologies of the new millennium. Although a lot of researches have been conducted to identify the most effective processing conditions for micro injection moulding, the comprehension of the influence of all parameters on the quality, the properties and the reliability of the moulded parts is still an issue. In this context, this study aims to evaluate the effects of the micro injection moulding process conditions on the tensile properties of micro parts, investigating the influence of three main process parameters: the injection speed, the mould temperature and the melt temperature. A full factorial plan has been applied to study the contributions of these parameters and a second study has been performed to understand the synergic interaction between the two temperatures on the tensile strength. Due to its high level of potential crystallinity, a typical semi-crystalline thermoplastic resin was used in the experiments. The results of the analysis showed a great influence of the mould temperature (Tmould) on the ultimate tensile strength and of the melt temperature (Tmelt) on the deformation at the point of breaking; whereas the injection speed was significant on the overall mechanical performance. A new studied factor (Tmelt-Tmould) could affect the resulting molecular structure and consequently the mechanical behaviour, but itself is not sufficient to thoroughly explain the observed behaviour. Moreover, the visual inspection of the deformation mechanism at break shows three distinctive trends demonstrating the great variability of the mechanical properties of micro-injected specimens due to process conditions.

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Postawa, Przemyslaw, et Tomasz Stachowiak. « Mould temperature control during injection moulding process ». Dans PROCEEDINGS OF PPS-30 : The 30th International Conference of the Polymer Processing Society – Conference Papers. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918487.

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G, Tosello, Hansen H. N. et Guerrier P. « Process Condition Monitoring of Micro Moulding using a Two-plunger Micro Injection Moulding Machine ». Dans 7th International Conference on Multi-Material Micro Manufacture. Singapore : Research Publishing Services, 2010. http://dx.doi.org/10.3850/978-981-08-6555-9_136.

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Bellantone, Vincenzo, Rossella Surace, Francesco Modica et Irene Fassi. « Effect of Surface Roughness in Micro Injection Moulding Process of Thin Cavities ». Dans ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59968.

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Due to its ability to produce low-cost and high repeatable micro polymeric parts, injection moulding of micro components is emerging as one of the most promising enabling technologies for the manufacturing of polymeric micro-parts in in many different fields, from IT to Healthcare, to Medicine. However, when approaching the micro-scale, different issues related to the process should be addressed, especially as the depth of the mould cavity becomes very thin. In particular, the mould roughness could affect the surface quality of the produced micro components, like in macro moulding, as well as the complete filling of the parts. Although micro-injection moulding process has been extensively studied, further research on the effect of mould roughness conditions and on non-Newtonian fluid flow in micro-cavities are required. This will shed a light and open up new paths for a deeper understanding of the moulding scenario. The main objective of the present paper is the evaluation of the influence of the mould roughness on the polymer flow during micro injection moulding process. The test parts have been realized in POM material and have thickness lower than 250 μm. The test part design has been properly conceived in order to neglect the effect of dimensions and geometry and to highlight the roughness contribution during the filling phase of micro injection moulding process. The experimentation has been performed considering cavities with different roughness values (3 levels) and decreasing depths (3 levels), for a total of nine test parts manufactured by micro-electrical discharge machining process (μ-EDM). The results of the experiments are discussed in the paper and show that cavity surface roughness affects the injection process as the moulding scale level is decreased. In particular, when the cavity depths are reduced, higher surface roughness promotes the filling of components and this finding could be ascribed to the increase of wall slip effect.

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Groot, J. A. W. M., C. G. Giannopapa et R. M. M. Mattheij. « A Computer Simulation Model for the Stretch Blow Moulding Process of Polymer Containers ». Dans ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25710.

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Stretch blow moulding is a widely used technique e.g. for the production of PET bottles. In a stretch blow moulding process a hot preform of polymer is simultaneously stretched and blown into a mould shape. The process takes place at a fast rate and is characterised by large deformations and temperature gradients. In this paper the computer simulation model presented in is applied to the stretch blow process for the production of PET bottles. The model was previously developed by the authors for the simulation of 2D axial-symmetrical blow processes for the production of glass containers. The model is based on finite element methods and uses a level set method to track the interfaces between air and the material. The simulation model is modified in order to correctly describe the material behaviour of PET, take into account the stretch process and substitute the process parameters for stretch blow moulding. Furthermore, it is verified that the PET behaviour can be modelled as a non-newtonian, isothermal fluid flow, based on a viscoplastic material model. An application presented is the stretch blow moulding of a realistic PET water bottle.

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Qing, Yan, Yi-qiang Wu, Chun-hua Yao et Zhi-yong Qing. « Study on Moulding Process of Woodceramics Without Formaldehyde Emission ». Dans 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2009). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5163488.

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G. Scholz, Steffen, Tobias Mueller, Leonardo Santos Machado, Matteo Calaon, Guido Tosello, Stephane Dessors, Manfred Prantl et Nathan Miller. « Process Optimization for Injection Moulding of Passive Microwave Components ». Dans 4M/IWMF2016 The Global Conference on Micro Manufacture : Incorporating the 11th International Conference on Multi-Material Micro Manufacture (4M) and the 10th International Workshop on Microfactories (IWMF). Singapore : Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-11-0749-8_743.

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