WIRE ELECTRIC DISCHARGIE MACHINING METHOD AND WIRE ELECTRIC DISCHARGE MACHINE

摘要

The present invention provides a wire electric discharge machining apparatus for machining a workpiece (1) by electric discharge in which driving means (9) relatively moves a wire electrode (5) and the workpiece (1) while machining power supplying means (10) supplies a working energy between the wire electrode (5) and the workpiece (1). The wire electric discharge machining apparatus comprises working energy adjusting means (13) for decreasing the working energy per unit movement distance of the wire electrode (5) when the distance between an approach point (O) connecting a runway portion (4) and a machining configuration portion (2) on the relative movement passage of the wire electrode (5) and the workpiece (1) and a center of the wire electrode (5) in the machining configuration portion (2) is within a range where the machining volume of the workpiece (1) per unit movement distance of the wire electrode (5) is decreased. Therefore, it is possible to suppress an intrusion (6) from being formed on a machined face of the workpiece (1) near the approach point (O). <IMAGE>