| 摘要 |
PURPOSE:To prevent deteriorations of working accuracy and stability in accordance with the change of thickness of a work piece by a method wherein servo- feeding is effected so as to coincide an average inter-electrode voltage with a reference voltage and the sensibility of the servo is increased when a difference between the average inter-electrode voltage and the reference voltage has become higher than a predetermined value. CONSTITUTION:In a wire-cut electric spark machining, the servo-feeding of a wire electrode is effected so as to coincide the average value of the inter-electrode voltage with the reference voltage. When the absolute value of a difference voltage ER=Vg-Vs, which is the difference between the average inter-electrode voltage Vg and the reference voltage Vs, is larger than a value V0, the sensibility of the servo is increased to permit to respond in high speed when the thickness of the work piece is changed. |
