ワイヤ放電加工の加工精度に関する基礎的研究(第5報)休止時間制御を用いた小円弧凹コーナR荒加工の加工時間短縮方法

Abstract

This paper describes a control method to improve the accuracy of a concave corner with small radius R on the rough cut of wire EDM. A well-known off-time (pulse interval time) control method has an advantage in terms of corner precision but it takes a long time to cut the corner. In this paper, methods to reduce the machining time of the off-time control method are discussed. The off-time control method is combined with the overcut method, the servo voltage control method and the simple path modification method. The proposed method is found to be useful for improving the corner accuracy and reducing the machining time. The machining time was decreased from 90 to 28 seconds, and it was shorter than 34 seconds of the dwell over cut method proposed in a previous study. The residual error of the corner shape was decreased to 15μm. The procedure and expressions used to calculate the control values are described.