Katachiho electric discharge machining apparatus and discharge machining method sinking

摘要

PROBLEM TO BE SOLVED: To shorten machining time and improve machining efficiency while safely machining by reliably avoiding an abnormal machining state such as continuous arc discharge or concentrated discharge.;SOLUTION: A detector 10 detects whether normal discharge or abnormal discharge takes place based on voltage between electrodes per discharge. A determining device 20 determines whether a normal discharge state or an abnormal discharge state takes place based on the normal discharge and the abnormal discharge. A pulse controller 30 expands OFF-time by a first factor when the abnormal state comes after the normal discharge state, and further expands the OFF-time by a second factor smaller than the first factor if the abnormal discharge state successively takes place. It shortens the OFF-time by the first factor when the normal discharge state comes after the abnormal discharge state, and further shortens the OFF-time by the second factor if the normal discharge state successively takes place.;COPYRIGHT: (C)2009,JPO&INPIT