| 摘要 |
PURPOSE:To enable stabilized machining and improve machining accuracy by loading the data of a machining gap voltage wave form that appears in a machining gap into a memory and comparing this data to a machining gap voltage wave form at the time of machining and judging the machining condition. CONSTITUTION:A machining voltage wave form generated between a discharge machining electrode 4 and a workpiece 5 during electric discharge machining is inputted from an input section 33 and, after first subjected to processing such as the amplification of signals, enhancement of a specific area, etc. in a preparation circuit 34, it is sent through an A-D converter 35 to a Fourier transformation processing circuit 40. Here, the Fourier transformation is performed and a frequency vector is extracted, and the power is calculated from the sum total of absolute-value converted values, which are also regulated with this power. Then, the calculated result is loaded as a registration pattern 39 into a memory 36, and is compared, on judging a machining condition, to an input machining pattern 38 in a pattern matching circuit 41 and an electric discharge lasting time control device 22 and a suspension width control device 23 are controlled in accordance with the compared result. |
