相対変位フィードバックによる形彫放電加工機の高速・高精度化

概要

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The full-closed-loop is popularly used to improve the positioning accuracy of machine tools and electrical discharge machines. However, it consists of a non collocated motor and position sensor, and thus the elastic deformation between the motor and the sensor induces the mechanical vibration which restricts the bandwidth of positioning control. To suppress this instability, we proposed a new controller which feeds back the relative displacement and the relative velocity from the motor to the positioning table. A stability condition is investigated in the 2-DOF model that is the basis of the full closed-loop system, and the precise effect of the controller is examined in a 4 DOF model of an actual electrical discharge machine. Operation of an actual machining test clarified that machining speed was enhanced twofold in the finishing machining in the lateral servo mode, and the positioning accuracy was maintained to be equivalent to that of a usual full-closed-loop.
一般社団法人日本機械学会の論文
1997-05-25