| 摘要 |
<p>PURPOSE:To automatically switch over a machining condition in such a way that a discharge condition agrees with that of a target value. CONSTITUTION:An initial machining condition (for instance, off-time) P1, a target discharge condition (for instance, normal discharge rate) P2, and a constant P3 to be used for operations for obtaining a new machining condition, are set. First, the initial machining condition P1 is stored in a register D storing execution machining condition, under which condition, machining is started (S3). Detected data P4 on an electric discharge condition is stored in a register E (S6), deviation (E) from the target discharge condition is determined so as to be stored in the register E (S7). A new processing condition (A) is determined by adding a value which is determined in such a way that the deviation (E) is multiplied by the constant P3 (=C), to the present machining condition (A) (S8). From now on, the aforesaid processing is repeated in order, so that the machining condition is changed in such a way that the discharge condition agrees with the target discharge condition. Since the discharge condition is thereby kept at a definite discharge condition, electric discharge machining is thereby stable. In this case, the target discharge condition is determined by test machining.</p> |
