In this study an analytical model has been developed to describe air pressure and residual air mass variations in pressure die casting for atmospheric venting. During injection of molten metal into a die cavity, air is evacuated from the cavity through vents. In this study, the influences of air velocity and friction factor due to temperature dependent viscosity and vent roughness change have been investigated. The results of the model show that there is a critical area ratio over which a quasi steady state is reached, therefore, the air pressure in the cavity remains constant. In addition, for each area ratio there is a critical/minimum time ratio below which outlet Mach number is not large enough to create choked flow. In this case, the rate of outflow air mass is not maximum. Finally, the results of the model addresses that the friction factor depends on hydraulic diameter of the vent and assuming a constant value for it is not valid.
Modeling of Air Venting in Pressure Die Casting Process
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received October 2002; Revised January 2004. Associate Editor: R. E. Smelser.
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Nouri-Borujerdi, A., and Goldak, J. A. (September 7, 2004). "Modeling of Air Venting in Pressure Die Casting Process ." ASME. J. Manuf. Sci. Eng. August 2004; 126(3): 577–581. https://doi.org/10.1115/1.1767187
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