Simultaneous Control of Cutting Force and Position Using Two Degree-of- Freedom Controller in CNC Ball-end Milling Process

2자유도 제어기를 이용한 CNC볼엔드밀링 공정에서 절삭력과 위치의 동시제어

There are two important variables in machining process control, which are feed and cutting speed. In this work, a two degree-of-freedom controller is designed and implemented to achieve on-line cutting force control and position control based on the modelling of cutting process dynamics which are established through step response test. Two schemes are proposed and implemented. The first is feed control under the constant spindle speed and spindle speed control under the constant feed speed. The second is a simultaneous control of feed and spindle speed. The last performs a position control under the constant cutting force. Those are confirmed to work properly. Especially the latter shows a faster response.