旋削機能付きマシニングセンタの主軸回転固定機能の安定化

抄録

The stabilization of spindle locking in a machining center with turning function was studied. To lock rotation, a friction brake structure is used: a brake ring is mechanically pressed against the spindle to generate solid friction. The weakness of this structure lies in the conditions of contact between the brake ring and the spindle. When there is water or oil in the contact interface, the friction coefficient drops drastically, resulting in loss of locking performance. The braking structure had been designed using friction coefficients obtained from past experience. In parameter designs of the contact interface carried out in the present study under various design strategies and combinations thereof, the friction coefficient was found to vary greatly, and a stable spindle resistant to external factor effects was successfully developed.