Wire tension control method

Abstract

Abstract PURPOSE:To prevent the occurrence of such a situation as the break of a wire, slackening thereof, or the like by constituting so that the target variation of power to be supplied to an electromagnetic powder brake is stored, and this is divided, and is output one by one so as to delay the variation. CONSTITUTION:In a NC control unit 2, with regard to the control of an electromagnetic powder brake 12, a means for storing the target variation by which the voltage of power to be supplied thereto is changed from the present value to the target value, and a means for dividing the target variation, and for one-by-one outputting it to the electromagnetic brake 12 are prepared. As a result, at the initial stage of start of an electric discharge machining device, or at the rising stage such as at the time of the operation restart after automatic connection, the voltage change of power to be supplied to the electromagnetic powder brake 12 becomes gradual, and the change in tension of a wire 4 also becomes gradual, so that the lock of the electromagnetic powder brake 12 and the break of the wire 4 is not caused. Similarly, at the time when the tension of the wire is decreased, the change of voltage is gradual, and the reduction in the tension of the wire is also gradual, so that such a situation as the slackening of the wire 4 or the like is not caused.

Inventors

• 👤 Toshiyuki Asao
• 👤 利之 浅生
• 👤 Yasuo Arakawa
• 👤 靖雄 荒川
• 👤 Junichi Kato
• 👤 淳一 加藤

Bibliographic Details