| 摘要 |
PCT No. PCT/JP92/00844 Sec. 371 Date Apr. 15, 1993 Sec. 102(e) Date Apr. 15, 1993 PCT Filed Jul. 3, 1991 PCT Pub. No. WO93/01017 PCT Pub. Date Jan. 21, 1993.An apparatus for a wire cut electrical discharge machine for preventing breakage of the wire electrode during machining, and thereby increasing machining performance. Since wire electrode breakage accidents during machining are often the result of a concentration of spark discharges in the machining area, the present invention controls machining conditions to prevent wire electrode breakage by detecting any continuous generation of spark discharges in a specific zone of the machining zone and discriminating normal concentration phenomenon from a truly bias sparking condition based on the position of the detected sparks. Appropriate control over the machine or machining conditions to relieve the problem may be exerted in response to a detected biased spark discharge condition. A biased spark discharge condition is detected and discriminated when spark discharges continue to occur within a set bias area, defined as a predetermined area which is set around the position of a spark discharge. If subsequent spark discharges are detected outside the bias area, then a non-biased state is determined and a new bias area is set. Thereafter, this procedure is repeated.
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