The Experts below are selected from a list of 81 Experts worldwide ranked by ideXlab platform
J Hernandez - One of the best experts on this subject based on the ideXlab platform.
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on the optimum plunger acceleration law in the slow shot phase of pressure Die Casting Machines
International Journal of Machine Tools & Manufacture, 2001Co-Authors: F Faura, J Lopez, J HernandezAbstract:The objective of this paper is to analyse a plunger acceleration law that is expected to minimize air entrapment in the slow shot phase of pressure Die Casting in horizontal cold chambers, and thus to reduce porosity in manufactured parts. The study is carried out using results from an analytical model of the flow of molten metal in the shot sleeve, which is based on the shallow-water approximation, and whose predicted optimum acceleration parameters are in good agreement with available experimental results. The results for the surface profiles of the wave formed during plunger movement using plunger acceleration laws which are typically used in pressure Die Casting are compared with those corresponding to the proposed law. Some analytical predictions for the wave profiles and for the mass of trapped air are compared with numerical results obtained from a finite-element code, which solves momentum and mass conservation equations. The limiting values of the initial filling fraction required for appropriate operating conditions are determined for wide ranges of acceleration parameters and pouring hole locations.
F Faura - One of the best experts on this subject based on the ideXlab platform.
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on the optimum plunger acceleration law in the slow shot phase of pressure Die Casting Machines
International Journal of Machine Tools & Manufacture, 2001Co-Authors: F Faura, J Lopez, J HernandezAbstract:The objective of this paper is to analyse a plunger acceleration law that is expected to minimize air entrapment in the slow shot phase of pressure Die Casting in horizontal cold chambers, and thus to reduce porosity in manufactured parts. The study is carried out using results from an analytical model of the flow of molten metal in the shot sleeve, which is based on the shallow-water approximation, and whose predicted optimum acceleration parameters are in good agreement with available experimental results. The results for the surface profiles of the wave formed during plunger movement using plunger acceleration laws which are typically used in pressure Die Casting are compared with those corresponding to the proposed law. Some analytical predictions for the wave profiles and for the mass of trapped air are compared with numerical results obtained from a finite-element code, which solves momentum and mass conservation equations. The limiting values of the initial filling fraction required for appropriate operating conditions are determined for wide ranges of acceleration parameters and pouring hole locations.
Nancy Gerth - One of the best experts on this subject based on the ideXlab platform.
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Metal Additive Manufacturing for tooling applications - Laser Beam Melting technology increases efficiency of Dies and molds
Metal Additive Manufacturing Conference (MAM), 2014Co-Authors: Bernhard Müller, Mathias Gebauer, Ralf Hund, Roland Malek, Nancy GerthAbstract:Applying additive manufacturing technologies in the tooling sector is reaching a new level with Laser Beam Melting, since this technology allows layer-by-layer manufacturing of completely dense tool and Die inserts in standard high-alloyed tool steel. The technology is now ready to go beyond applications in low impact processes like plastic injection moulding and enters metal working process applications like metal forming and Die Casting. The potential of additive manufacturing for added value in tooling applications has now been investigated for various metal working processes. The paper presents results of research and pilot application projects to apply laser beam melting to manufacture tooling for metal forming and aluminium Die Casting. The paper describes the shortcomings of conventional cooling channels in metal working tools and the resulting inadequate cooling effect in critical areas. The paper shows how innovative cooling systems can be implemented in metal working Dies through laser beam melted Die inserts. Cooling of specific Die areas has been realized by placing specially designed cooling channels very close to the Die cavity, targeting shorter cycle times, structural and dimensional quality improvements of manufactured metal parts and a reduction of energy consumption for cooling and idle times of forming presses and Die Casting Machines. The paper will present the achieved results for both metal working applications and point out the general potential of additive manufacturing in tooling.
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Laser Beam Melting for Tooling Applications – New Perspectives for Resource-Efficient Metal Forming and Die Casting Processes
2013Co-Authors: Bernhard Müller, Ralf Hund, Roland Malek, Nancy GerthAbstract:Applying additive manufacturing technologies in the tooling sector is reaching a new level with Laser Beam Melting, since this technology allows layer-by-layer manufacturing of completely dense tool and Die inserts in standard high-alloyed tool steel. The technology is now ready to go beyond applications in low impact processes like plastic injection moulding and enters metal working process applications like metal forming and Die Casting. The potential of additive manufacturing for added value in tooling applications has now been investigated for various metal working processes.The paper presents results of research and pilot application projects to apply laser beam melting to manufacture tooling for metal forming and aluminium Die Casting. The paper describes the shortcomings of conventional cooling channels in metal working tools and the resulting inadequate cooling effect in critical areas. The paper shows how innovative cooling systems can be implemented in metal working Dies through laser beam melted Die inserts. Cooling of specific Die areas has been realized by placing specially designed cooling channels very close to the Die cavity, targeting shorter cycle times, structural and dimensional quality improvements of manufactured metal parts and a reduction of energy consumption for cooling and idle times of forming presses and Die Casting Machines. The paper will present the achieved results for both metal working applications and point out the general potential of additive manufacturing in tooling.
K Venkatesan - One of the best experts on this subject based on the ideXlab platform.
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a study of erosion in Die Casting Dies by a multiple pin accelerated erosion test
Journal of Materials Engineering and Performance, 1995Co-Authors: Rajiv Shivpuri, M Yu, K VenkatesanAbstract:An accelerated erosion test was developed to evaluate the erosion resistance of Die materials and coatings for Die Casting application. An acceleration in wear was achieved by selecting pyramid-shaped core pins, hypereutectic aluminum silicon Casting alloy, high melt temperatures and high gate velocities. Multiple pin design was selected to enable multiple test sites for comparative evaluation. Apilot run was conducted on a 300 ton commercial Die Casting machine at various sites (pins) to verify the thermal and flow similarities. Subsequently, campaigns were run on two different 300 ton commercial Die Casting Machines to evaluate H13 Die material and different coatings for erosive resistance. Coatings and surface treatments evaluated included surface micropeening, titanium nitride, boron carbide, vanadium carbide, and metallic coatings—tungsten, molybdenum, and platinum. Recent campaigns with different melt temperatures have indicated a possible link between soldering phenomena and erosive wear. This paper presents the details of the test set up and the results of the pilot and evaluation tests.
J Lopez - One of the best experts on this subject based on the ideXlab platform.
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on the optimum plunger acceleration law in the slow shot phase of pressure Die Casting Machines
International Journal of Machine Tools & Manufacture, 2001Co-Authors: F Faura, J Lopez, J HernandezAbstract:The objective of this paper is to analyse a plunger acceleration law that is expected to minimize air entrapment in the slow shot phase of pressure Die Casting in horizontal cold chambers, and thus to reduce porosity in manufactured parts. The study is carried out using results from an analytical model of the flow of molten metal in the shot sleeve, which is based on the shallow-water approximation, and whose predicted optimum acceleration parameters are in good agreement with available experimental results. The results for the surface profiles of the wave formed during plunger movement using plunger acceleration laws which are typically used in pressure Die Casting are compared with those corresponding to the proposed law. Some analytical predictions for the wave profiles and for the mass of trapped air are compared with numerical results obtained from a finite-element code, which solves momentum and mass conservation equations. The limiting values of the initial filling fraction required for appropriate operating conditions are determined for wide ranges of acceleration parameters and pouring hole locations.