ダイカスト金型の穴加工条件の最適化

抄録

As longer life is required for the molds used in die-cast molding, these molds are being made of tougher and more rigid materials which are hard to machine. In particular, drilling holes in mold materials has become less efficient, which is one of the factors that have increased the cost of the molds. Based on past case studies, the present study evaluated drilling performance in terms of electrical energy required, evaluated cutting efficiency in terms of electrical energy versus machining time, and also evaluated breakage and abrasion of drills. Optimal drilling conditions were derived from these evaluations, the drill feed rate was increased by a factor of five in view of the trends in factorial effect diagrams,and a new evaluation was carried out. The results were of highly practical value: die-cast mold drilling time was reduced to one fifth and surface roughness was reduced to one third of the previous values.