Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Other

Toshio Moro

Akihiro Goto

Seiji Satou

Youichi Ootomo

Satoshi Suzuki

Masayuki A Suzuki

Makoto Tanaka

Tsutomu Sasaki

Masao Akiyoshi

Masahiro Iezawa

Takashi Yuzawa

Naotake Mohri

Akihiko Imagi

Manabu Yoshida

Mamoru Kosuge

Shiro Imai

Akihiro Sakai

Takashi Kanaya

Katsushi Furutani

Takahisa Masuzawa

Koutarou Watanabe

Masakatsu Mune

Akifusa Katagiri

Hisao Yasuzumi

In an electrode for electric discharge surface treatment used in electric discharge surface treatment for forming a hard coating on the surface of a treated material through the energy by generating electric discharge between the electrode and the treated material, a TiC powder () which is metal carbide and a TiHpowder () which is metal hydride are mixed and heating treatment is performed after compression molding and hydrogen in the TiHpowder () is desorbed to make a Ti powder () and a practical electrode () for electric discharge surface treatment having moderate strength and crumbliness as well as safety is formed.

Discharge surface treating electrode and production method thereof

A discharge electrode comprising a material having solid lubricant effect, such as molybdenum, is used to generate discharge in a pulse form between the discharge electrode and a workpiece, the surface of which is to be treated, in working liquid containing carbon components, such as water. Material consumed or melted from the discharge electrode, generated because of the electric discharge energy based on the pulse form discharge, gets adhered to and deposited onto a surface of the workpiece thereby forming a coat having lubricant effect on the surface of the workpiece.

Surface treatment method using electric discharge, and an electrode for the surface treatment method

WC powder ( ) and W powder ( ) are mixed and entered in a press mold and compressed and molded, thereby forming a discharge surface treatment electrode ( ). Discharge is caused to occur between the discharge surface treatment electrode ( ) and a workpiece ( ) by a discharge surface treatment power unit ( ), whereby a component of the discharge surface treatment electrode ( ) melted by discharge heat is deposited on the workpiece ( ). W, a component of the discharge surface treatment electrode ( ), reacts with C, a component of work liquid ( ), to produce WC and together with the WC which is a component of the discharge surface treatment electrode ( ) a hard film ( ) made of WC is formed on the workpiece ( ). The hardness and strength of the hard film formed on the workpiece ( ) by the discharge surface treatment can be enhanced.

Discharge surface treatment electrode, manufacturing method thereof and discharge surface treating method

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

A method of wire electric discharge machining by which an electric discharge is generated in a gap between a wire electrode ( ) and a workpiece ( ) so that the workpiece ( ) is machined, includes the steps of: a first step in which electric discharge machining is conducted in a dielectric liquid ( ); a second step in which electric discharge machining is conducted in mist ( ); and a third step in which electric discharge machining is conducted in gas ( ), such that the machining process is changed over when straightness of the workpiece ( ) becomes a predetermined value. It is possible to provide a method of wire electric discharge machining, the productivity of which is high, suitable for highly accurate machining.

Method of electrodischarge wire machining

The wire electric discharge machining apparatus includes apparatus or generating a discharge in a gap between a wire electrode ( ) and a machining subject ( ) to machine the machining subject. A gas supplying unit ( ) supplies a pressurized gas in the gap between the wire electrode and the machining subject. This wire electric discharge machining apparatus has a high productivity, and it is suitable for high-precision machining.

Method of and apparatus for wire electric discharge machining capable of machining the machining subject coarsely in a dielectric fluid and finely in a gaseous environment

The shape of each electrical supply die for contact-supplying electricity to a wire electrode is changed to a cylindrical shape, and grooves are provided in its outer surface in parallel to the traveling direction of the wire, wherein upper electric supply is effected by contact-supplying of electricity at a projecting surface formed between adjacent ones of the grooves, while lower electric supply is effected by pressure contact-supplying of electricity by causing a concave surface to contact the groove.

Wire electrical discharge apparatus

A discharge surface treatment method with which discharge is caused to occur between an electrode and a workpiece to generate energy to form a coating on a surface of the workpiece, and method therefore. An electrode is made by combining a hard material, such as WC, and a soft material, such as Co. The hard and soft materials are mixed and compressed into a green compact. The green compact is baked in a vacuum furnace at a temperature which is below the sintering temperature but high enough to melt the soft material. The melted soft material fills the gaps between the particles of the hard material, resulting in an electrode having a texture similar to chalk called incomplete-sintering. The electrode is then used in discharge surface treatment.

Electrode for discharge surface treatment and manufacturing method therefor and discharge surface treatment method and device

In a wire electric discharge machine in which the processing liquid exists between a wire electrode and a work piece , and the work piece is processed while the discharge is being generated, the wire electric discharge machine has a jetting nozzle to jet the processing liquid to the work piece , and a wire guide portion to flow the processing liquid to the jetting nozzle and to guide the wire electrode into a bored hole, and the wire guide portion has the first passage to flow the processing liquid into the jetting nozzle, and the second passage to convert the direction of the processing liquid to be flowed into the first passage

Wire electric discharge machine

In the first pulse width T of an electric discharge current, the group of switching elements ( ) are controlled by the control means ( ) and the first peak value Ip is set at a predetermined value and the electrode material is emitted so that a predetermined quantity of electrode material can be supplied, and the thus emitted electrode material is made to adhere to the workpiece ( ) so as to compose the electrode component ( ). In the second pulse width T of an electric discharge current, the second peak value Ip is set so that the emission of electrode material can be suppressed and the electrode component ( ) adhering to the workpiece ( ) can be melted, and the electrode component ( ) is melted and a hard coat composed of the electrode component ( ) melted on the workpiece ( ) is formed. In this way, an excellent hard coat, the crystal grains of which are fine, can be formed on the workpiece ( ).

Electric power unit for electric discharge surface treatment and method of electric discharge surface treatment

In the discharge surface treatment method, an electrode having a cylindrical shape and a work are aligned face to face with a predetermined gap therebetween in a machining fluid. The electrode is a green compact electrode formed by compressing metal powder or powder of a metal compound or ceramics powder, or a metal electrode. A hard coat film of the material with which the electrode is made or a reactant of this material is formed on a surface of the work because of the energy generated during the electric discharge.

Method of surface treatment using electric discharge and an electrode

A green compact electrode for discharge surface treatment used for discharge surface treatment for generating discharge between a work and a green compact electrode obtained by pressuring and compacting a metal powder or a powder of a compound metal, and using the discharge energy forming a coating of an electrode material or a substance obtained through a reaction of the electrode material with the discharge energy on the work surface; the electrode is obtained by mixing a soft metal powder as a bonding agent with the metal powder or the compound metal powder, and pressuring and compacting the mixed powder.

Green compact electrode for discharge surface treatment and method of manufacturing green compact electrode for discharge surface treatment

An upper guide and a lower guide are respectively disposed above and below a workpiece. The upper guide and the lower guide respectively has wire guides for guiding the wire electrode. A pair of electric supply dies are respectively provided in the upper guide and the lower guide and are adapted to come into contact with and energize the wire electrode. An internal nozzle and an external nozzle are provided in at least one of the upper guide and the lower guide. A first piping system supplies the working fluid to the internal nozzle and a second piping system supplies the working fluid to the external nozzle, where the second piping system is independent of the first piping system. The working fluid having lower temperature and higher pressure than the working fluid jetted out and supplied from the external nozzle is jetted out and supplied to the workpiece from the internal nozzle.

Wire electrical discharge machining apparatus

The electrode used in processing a surface of a mold is manufactured as follows. Material powder such as metal powder or metal compound powder is filled in a female mold of the mold. Then the material powder in the female mold is press-molded using a male mold. The surface of the mold is then treated using this electrode.

Method of processing a surface of a mold using electric discharge, an electrode used in such processing and a method of manufacturing such an electrode

An electric discharge is generated between an electric discharge surface treatment electrode and a wire electrode, and an electric discharge surface treatment material is stuck on the surface of the wire electrode by the energy of the electric discharge. An electric discharge is then generated between a work piece and the wire electrode on which the electric discharge surface treatment material is stuck, and a surface modified layer is formed on the surface of the work piece by the energy of the electric discharge.

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Tokyo, Japan

Toshio Moro