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>Venting Design and Process Optimization of Die Casting Process for Structural Components Part I - Venting Efficiency Analysis of Die Casting Process
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Venting Design and Process Optimization of Die Casting Process for Structural Components Part I - Venting Efficiency Analysis of Die Casting Process
Part I of this paper presents a comprehensive and easy-to-use method to determine the venting efficiency of a die casting process, which includes the tooling parameters, venting system parameters and die casting process parameters. Venting efficiency is clearly defined as the percentage ratio of air mass being vented out of the die divided by the initial air mass of the initial air volume in the system at room temperature, instead of the conventional and vague cavity pressure definition, because cavity air pressure could be still high at the end of fill due to a high metal injection rate even with a vacuum system. All the expressions are written in the form that can be easily plugged-in to a spreadsheet, providing a convenient tool for tooling and process engineers to design the venting process to achieve the venting efficiency target to meet the quality requirement of a structural or conventional component. To show how this analysis method can be used some typical venting analysis results are discussed. The mass flow rates, cavity air pressure and venting efficiency results clearly illustrate how the venting system performs during the whole filling process including both the slow phase and the fast phase.
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