弾塑性理論による中空円筒ダイカスト鋳物の離型力の評価

抄録

In order to evaluate the resistance due to shrinkage of aluminum alloy die castings against ejection, the force required to pull the core slide from the casting and the change in casting's internal temperature were measured of hollow cylindrical die castings produced with different chill time. The core pull-out force measured was compared with the theoretical value in accordance with the plastic-elastic theory of shrinkage fit of a thick-walled cylinder. The calculated values agreed well with the measured ones. At a time of core pulling, a thin walled casting remained in a fully plastic state, whereas a thick walled casting was thought to be in a partly plastic state from the calculated values.