· IngenierÃa ·
Jun-Ho Hong, Young-Sim Choi, Ho-Young Hwang, Jeong-Kil Choi
KITECH (Korea Institute of Industrial Technology), South Korea
67th World Foundry Congress
The cold chamber high pressure die casting process is one of the most
general processes to make a lightweight material alloy casting. This
process usually guarantees the short cycle times and good surface quality.
However, the gas porosity defect appears easily in this process due to the
air entrapment during the injection stage. The flow pattern of molten metal
in the shot sleeve is closely related to the air entrapment. Generally, the
flow patterns in the shot sleeve are concerned with the various plunger
speeds and fill rate of molten metal. To investigate the mechanism of the
gas porosity generations in the shot sleeve, the numerical simulation is
introduced in this study. The numerical simulation results were shown
good agreement with the experimental results using water model. From
the comparison results, we conclude that the developed mathematical
model for the flow pattern simulation in the shot sleeve of the cold
chamber high pressure die casting process is useful to determine the
proper condition of the plunger speed in some rage of the molten metal fill
rate.
