Hitachi Seiko, Ltd.

Akira Busujima

Toshiyuki Makino

Takahiko Yamashita

Ratios between a distance between an upper wire guide and the upper surface of a workpiece to be machined, a thickness of the workpiece and a distance between a lower wire guide and the lower surface of the workpiece are given to the inlet and outlet positions of a wire electrode at the upper and lower surfaces of the workpiece which have been interpolated so as to directly obtain displacement positions of the upper and lower wire guides, along which the upper and lower wire guides are moved successively, thereby obtaining an articles which is accurately machined with a relatively simple machining procedure.

Wire-cut electric discharge machining method

A servo control system has a motor for a control and a device for commanding target distance and velocity of movement of the control so as to actuate the motor in accordance with commands from the commanding device. The system further includes a distribution device for determining a set of distances of movement for a set of like number of unit times respectively on the basis of the target distance and velocity of movement; a device for adding predetermined numbers of unit times, in each of which the distance of movement is set at zero, before and after the set of the like number of the unit times, respectively; a device for setting a set of weights for the positions of movement for the like number of unit times, respectively; and an averaging device for successively adding the weights to the positions of movement for the like number of unit times, respectively, and averaging the resulting weighted position of movement of a first unit time and those of a desired number of preceding successive unit times to calculate a target position for the first unit time, and then repeating a similar averaging operation successively with respect to each of the remaining unit times in the order of sequence of the remaining unit times until a target position for a last time unit is calculated.

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Hadano, Japan

Akira Busujima