Znダイカストドリル加工のドライ化

抄録

Increasing public awareness of environmental issues has led to reconsideration of the use of large amounts of cutting lubricant for machining, and focused attention on dry or semi-dry machining. The authors' firm has been using a semi-dry drilling process to machine zinc die-cast parts for automobiles. Replacement of semi-dry drilling by dry drilling, which requires no cutting lubricant, would eliminate a cleaning step and improve the plant environment. In a previous optimization experiment the dry drilling process was evaluated through its use of electric power, but this proved problematic because of the long time needed for data analysis and the weak effect of noise factors. In a new experiment, the authors succeeded in obtaining stronger noise factor effects by modifying the drilling fixtures. As a result, it became possible to simplify the electric power evaluation and to complete optimization in only four days.