ダイカストの金型キャビティ内の溶湯圧力変化の解析

抄録

  Variation of molten metal pressure within a die cavity has been analyzed for AD 10.1 alloy and pure metals (aluminum, zinc, bismuth, tin and lead) using 90 metric tone locking force cold chamber type diecasting machine. The wave form of pressure is divided into two regions. In the first region, the molten metal pressure is keeping at constant immediately after injection of molten metal into die cavity. In the second region, the pressure is changing after the first region. The transition from the first region to second is caused by solidifying of gate. The wave form of second region depends on shrinkage rate of solidification. In the case of metal that shrink on solidifying, the pressure decreases with time at the second region. Degree of decreasing pressure becomes large with increasing shrinkage rate of solidification. On the other hand, the pressure of molten metal such as bismuth that expands on solidifying increase with time.