| 摘要 |
A used wire cutting device for wire cut electric discharge machine which appropriately determines the time to replace a movable blade and a fixed blade of a cutting mechanism on the basis of not only time but also the degree of wear of each blade. The device includes a wear rate storage means for storing the wear rate per cut (1/P) of a blade of the wire cutting device depending on the diameter and material of the wire. The number of cuts performed during machining is obtained from the length of time from the start to the end of machining, and the number of actions of cutting per unit time. The number of cuts obtained is multiplied by the wear rate (1/P) for the wire used, and the resultant value is added to the last value of total wear rate R. With the value thus obtained, the last value of the total wear rate R is replaced. When the current value of the total wear rate R exceeds a predetermined wear rate, a message recommending blade (chip) replacement is sent out, and when the chip is replaced, the total wear rate R is reset to 0. Also when an alarm indicating wire cut failure is sent out, the chip is replaced and the total wear rate R is reset to 0. Further, the device is so arranged to be able to replace the wear rate (1/P) stored on the basis of data obtained by actual cutting.
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