Effects of the Injection Speed and the Gate Geometry n the Flow Behaviors of the Molten Metal

摘要

A comprehensive methodology to elucidate the effect of the gate speed and the gate geometry on the flow characteristics of the molten Al alloy was presented in this study. A commercial Al alloy (ACD12) used for a general purpose diecasting was chosen as the model fluid to monitor the flow patterns during filling the die cavity. A high speed photography was employed to visualize the real time flow patterns of the molten ally during die filling sequence. The effects of the gate speed of the incoming fluid and the gate geometry on the die filling characteristics were investigated. In general, the flow patterns of the molten Al alloy were observed to be a laminar type when the melt was injected at a gate speed less than 0.3 m/s through a gate having a thickness larger than 10 mm.