Mitsubishi Denki Kabushiki Kaisha

Takashi Kanaya

Satoshi Suzuki

Toshio Moro

Hajime Ogawa

Toshihiro Enya

Mitsuaki Akune

Akifusa Katagiri

Hisao Yasuzumi

Tsuneo Kawaguchi

An electrical discharge machine for forming a small hole including an intermediate guide having an upper guide and lower guide to support an electrode for forming a small hole at two points between an electrode holder and a small hole guide and also having a chuck, which can be opened and closed, provided in each guide; a first drive unit to drive the intermediate guide in the longitudinal direction of the electrode, a second drive unit to open and close the guide chucks of the intermediate guide; and a third drive unit to variably change distance L between the upper guide and lower guide of the intermediate guide in the longitudinal direction of the electrode.

Electric discharge machine for making thin hole

In an electric discharge machining apparatus using linear motor drive in which a machining power supply unit supplies an inter-electrode space between an electrode ( ) and a workpiece ( ) with a machining power and the workpiece ( ) is machined while the electrode ( ) and the workpiece ( ) are moved in relation to each other by means of a driving device ( ) implemented by a linear motor, a magnet supporting plate ( ) for supporting a magnet ( ) which is on the secondary side of the linear motor; a base plate ( ) formed with at least one hole portion ( ); a spacer ( ) for holding the magnet supporting plate ( ) and the base plate ( ) while leaving a predetermined space therebetween; and a compressor, ( ), a dryer ( ), a lubricator ( ) and a regulator ( ) for injecting compressed gas ( ) from the hole portion ( ) toward the magnet supporting plate ( ) are provided. By making the compressed gas ( ) into collision with the magnet supporting plate ( ) as a collision jet, the heat conductivity increases, so that it is possible to cool the magnet ( ) and the magnet supporting plate ( ) efficiently with a simple configuration.

Electric discharge machining apparatus linear motor drive

Separately from an electrode jumping operation (an amount of rise of a first electrode jump (,)) aimed at discharging machining debris produced during electrical discharge machining, an electrode jumping operation (an amount of rise of a second electrode jump (,)) is inserted for which is set an amount of rise of jump with which balls or rollers used on a sliding portion of a mechanically driving part undergo one revolution or more. Further, in a case where an abnormality of a lubricant supplying unit (,) is detected, as for a program being continued, machining is stopped after the termination of the program, or machining is stopped after continuing the program within a fixed time duration, or a program other than for machining operation is made executable.

Electrical discharge apparatus

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Tokyo, Japan

Takashi Kanaya