Electrical discharge machine and machining method therefor

摘要

The present invention relates to an electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece. According to the present invention discharge pulse judging means are provided for determining whether each discharge pulse is normal or faulty. First count means count the number of successive faulty discharge pulses while second count means count the number of successive normal discharge pulses. Means are provided for causing said first count means to count and resetting said second count means when said faulty discharge pulse has occurred, and for causing the second count means to count and resetting said first count means when said normal discharge pulse has a occurred. In this way electrical discharge machining conditions may be controlled to be milder or harder depending on whether said first count means has counted a set value or said second count means has counted a set value. <MATH>