Mitsubishi Denki K.k.

Mitsubishi Denki Kabushiki Kaisha

Takeshi Iwasaki

Toshio Suzuki

Takuji Magara

Masahiro Yamamoto

Takeshi Yatomi

Hisashi Yamada

Hiroshi Takeuchi

Masahiro Noda

Shigeaki Naka

Akihiro Sakai

Kenzo Yokoyama

A broken wire electrode 3 of a wire electrode electric discharge machining device is automatically repaired at the wire breaking position. After the used portion is cut away, the wire electrode 3 is fed toward the work 1. Upon detection of contact of the wire electrode 3 with the work 1, the feeding of the wire electrode 3 is stopped. A predetermined amount of deflection is obtained when the feeding of the wire electrode 3 is stopped. The wire electrode 3 is then moved horizontally relative to the work 1 within a predetermined range, until the end of the wire electrode 3 eventually falls into the machined groove 14 and the wire electrode 3 comes out of contact with the work 1. Thereafter the feeding of the wire electrode 3 is resumed to span the wire electrode 3 across the feeding-side wire guide unit 4 and the receiving-side wire guide unit 5. The attitude of the wire electrode 3 within the machined groove 14 is constrained downward by the water jet 7 sucked into the machining liquid nozzle 27 via the suction pump 30.

Automatic broken wire repairing method for wire electric discharge

In a wire cut electric discharge machining method, feeding units having wire electrode feeding mechanisms are provided for wire electrodes different in diameter, respectively. The feeding units are moved, one at a time, to a wire electrode feeding path by cylinders coupled detachably to thereto, respectively, whereby the wire electrodes different in diameter are automatically replaced with each other, and machining conditions are automatically selected according to the diameter of a wire electrode and a machining process which are to be used. Therefore, the workpiece can be machined with the wire electrode most suitable for the given machining configuration. Thus, the method is high in machining accuracy and in machining efficiency.

Wire cut electric discharge machining method

A wire threading apparatus of the jet fluid stream transfer type is improved by providing the ability to reconfigure the structure of the apparatus during threading so that the entire apparatus is clear of the splash pattern of the fluid as it rebounds from the receiving guide.

Wire electrode threading apparatus for a wirecut electric discharge

A wire guide of the type used in wire-type EDM machines is improved by separately manufacturing a ceramic collar or collars and the support which houses the die guide, and subsequently combining these elements within a casing. The use of ceramic ensures corrosion resistance, while separate manufacture assures that the die guide is not subjected to the potentially damaging heat required in firing the ceramic.

Wire guides for traveling wire type apparatus

Rust inhibitors for electrical discharge machining solutions. Each preventive is composed of a fatty acid amide which has been obtained by dehydrating and condensing at least one fatty acid and at least one alkanolamine.

Electric discharge machining fluid with a fatty acid amide additive for

Wire electrode feeding device in wire cut electric discharge machine

In a wire electrode supplying device, a contact detector detects when a wire electrode supplied through a wire guide is brought into contact with the upper surface of a workpice, to output a detection signal, and in response to the detection signal, a control unit operates to suspend the supplying of the wire electrode and to insert it into a machining start hole formed in the workpiece while binding it with a jet stream, whereby the wire electrode is positively inserted into the machining start hole even when the wire guide is remote from the workpiece.

Wire electrode supplying device in wire cut electric discharge machine

A wire electrode supplying apparatus for a wire electric discharge machine to effect the machining of a workpiece by inserting a wire electrode through the workpiece and allowing electric discharge to take place between the workpiece and the wire electrode. In this apparatus, a wire electrode feeding section is provided for inserting the wire electrode through the workpiece, as well as a feeding-side guide section and a receiving-side guide section are provided with the workpiece placed therebetween for the positioning of the wire electrode. The wire electrode is formed of a small-diameter wire, and the feeding-side guide section and the receiving side guide section are respectively provided with small openings for constraining the direction of its movement. The passage of the wire electrode through the small openings is aided by reducing the speed of feeding the wire electrode when the wire electrode passes through the small openings. A vertically movable jet nozzle is provided for allowing a working fluid to be jetted from the vicinity of the feeding-side guide section toward the receiving-side guide section so that the wire electrode after passing through the feeding-side guide section heads toward the receiving-side guide section. By starting the jetting of the working fluid after passing through the jet nozzle, the wire electrode is guided positively.

Wire electrode supplying apparatus for wire electric discharge machine

A wire electrode supplying device in a wire cut electric discharge machining apparatus, which is capable of automatically supplying a wire electrode with accuracy during an automatic machining operation. In the wire electrode supplying device according to the present invention, an outside diameter of a pipe guide into which the wire electrode is inserted is changed stepwise, and its one end portion is made minimum in outside diameter so that the one end portion is allowed to be inserted into a machining start hole formed in a workpiece to be machined. Therefore, in machining a workpiece having a machining start hole small in diameter, the feeding of the wire electrode can be automatically, stably and accurately achieved.

Wire electrode supplying device for use in a wire cut electric discharge

A detecting unit for detecting when the wire electrode is released from a jet stream of a machining solution during the feeding of the wire electrode. Upon detection of the release of the wire electrode, the feeding of the wire electrode is suspended automatically to remove the deformed wire electrode.

In a machining device such as a wire cut electric discharge machine, an electrically conductive rubber member is attached to the machining solution jetting nozzle of its machining head in such a manner that, when the machining head abuts against the workpiece, the resistance of the rubber member is changed being compressed by the nozzle and the workpiece, and the change in resistance of the rubber member is detected to determine whether the change in resistance is normal or abnormal, thereby to detect the collision of the nozzle with the workpiece, whereby the machining head is protected from damage.

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Aichi, Japan

Takeshi Iwasaki