| 摘要 |
PURPOSE:To make an erosion rate go up as well as to secure a good finishing surface by performing rough machining, medium machining or finishing work with two types of discharge pulses dirrefent in pulse discharge current value. CONSTITUTION:A working power source 3 is provided with a high current crest value pulse generating circuit 3a and a low current crest value pulse generating circuit 3b whereby two types of pulses are generated, and they are impressed on a gap between a wire electrode 1 and a workpiece 2 via both current-energizing pins 8a and 8b. When a pulse output number of the high current crest value pulse generating circuit 3a is set to N, and that of the low current crest value pulse generating circuit 3b to (n), respectively, the (n) and the N value are set so as to become rough machining n<=N, medium machining n>=N and finishing work n>>N as a working condition with each output number of n and N according to those of rough machining, medium machining and finishing work, thus machining takes place.
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