Mitsubishi Denki Kabushiki Kaisha

Toshiro Oizumi

Shigeo Yamada

Tetsuro Ito

Nagao Saito

Kazuhiko Kobayashi

Testuro Itoh

Herein disclosed is an electric discharge machine, by which, after the machining operation of a workpiece by an electrode has reached a predetermined position, the machining operation is further accomplished while rocking the electrode in a plane generally normal to the feeding direction of the workpiece for the machining operation. The workpiece has its respective portion uniformly machined by effecting the machining operation accompanied by the rocking motions for a preset period, e.g., either for a predetermined time period or a predetermined number of the rocking motions so that the precision of the finishing operation can be improved.

EDM controller for providing a rocking motion to the electrode for

Electric discharge machine including rocking motion fine machining and

A discharge machining method for machining a workpiece by causing electric discharge between the workpiece and the machining electrode and an apparatus for practicing the method wherein, with the electrode confronting the workpiece in a primary machining direction and in the direction of a plane substantially perpendicular to the primary machining direction, the relative displacement of the electrode and workpiece is controlled in such a manner that a space is maintained between the electrode and the workpiece so that electric discharge occurs therein. The electrode is moved towards the intersections of straight lines which are parallel to and equally spaced from the contour of the electrode whereby the electrode is uniformly consumed. Very little abnormal arcing can occur. The machined workpiece has an excellent final configuration.

Method and apparatus for discharge machining polygonal contours

Electric discharge machine

An electrical discharge machine control device which controls the displacement of the relative positions of a machining electrode and a workpiece so that the relative positions of the electrode and workpiece are changed not only in the main direction in which the workpiece is machined with the electrode but also in a plane perpendicular to the Z-axis without rotating the electrode while a predetermined machining discharge gap is maintained between the electrode and the workpiece. The relative displacement in the perpendicular plane is displayed at an enlarged scale on an X-Y display device which may be a cathode-ray tube with the center of the displacement maintained at a predetermined origin point. An optical encoder detects the movement in the X-Y plane to provide a detection signal. The detection signal is applied through reversible counters to the horizontal and vertical deflection amplifiers of the display device.

Electrical discharge machine

A process and apparatus for the electrical discharge shaping of a workpiece to a shape corresponding to an electrode shape by sequentially applying an intermittent pulse voltage across the working gap between the workpiece and the electrode and wherein a pulse current having a special slant line waveform, e.g. a triangular waveform, which is different from a rectangular waveform is passed across the working gap from the initiation of discharge so as to minimize the electrode consumption ratio.

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Nagoya, Japan

Toshiro Oizumi