| 摘要 |
PURPOSE:To prevent the occurrence of unnecessary infeed to a work at a shifting point between a curve and a straight line, by controlling a machining table and an upper wire guide for the duration from the start point to the end point of an arc in time of taper machining for a circular part of the work by means of numerical control. CONSTITUTION:When a work 2 is machined, projection length to the horizontal surface of a segment connecting a shifting point of two points in a curve and a straight line at the moving locus of a wire electrode on a surface inclusive of an upper wire guide 3 and a surface of a machining table 1 is found upon its similitude development. And, there is provided with a control device 9 having a program which inputs a moving start point radius, a moving end point radius and a radius of curvature in the moving start point on the surface of the machining table 1 on the surface inclusive of the upper wire guide 3, controlling an X-axis control part 4, a Y-axis control part 5, a U-axis control part 6 and a V-axis control part 7. Thus, unnecessary infeed to the work can be prevented.
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