| 摘要 |
PURPOSE:To improve accuracy of machining in a corner part, by providing the first discriminator discriminating a machining speed for whether or not it reaches a predetermined value, setter automatically setting the machining speed predetermined value, second discriminator discriminating the present machining position for whether or not it is an out-corner part and a control unit. CONSTITUTION:In finish machining, the first discriminator 12 generates a signal when a machining speed reaches a predetermined value by decreasing a cutting amount. The second discriminator 14 generates a signal when the present machining position reaches in the vicinity of an out-corner from information of a control unit 11. Here a setter 17 automatically deduces the predetermined value of the machining speed to be set from information of a machining condition from the control unit 11. During the finish machining, a control unit 13, by the signals of both the discriminators 12, 14, controls the machining speed to be locked so that it is prevented from increasing to the predetermined value or more when the machining speed reaches the predetermined value. Accordingly, the machining speed promptly decreases even in the linear machining immediately after change of direction because the machining speed is locked to the proper value in an edged part.
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