抄録
The nipple used to cool the mold-die has broken frequently when moving the mold-die. It is not easy to remove the nipple of the conventional type which has broken, so that the demand of the nipples with hexagonal bore is high. Furthermore, stainless steel nipples were desired in the durability and the health side. However, stainless steel nipple, it cannot broach, hexagon indentation is processed by the dice. By semi-dry process is more ecological than the usual wet processing, was able to extend tool life.
