Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Ihi Corporation

Nec Corporation

Kazushi Nakamura

Akihiro Goto

Hiroyuki Teramoto

Satoshi Suzuki

Masahiro Okane

Kiyohito Oda

Yukio Sato

Mitsutoshi Watanabe

Hiroyuki Ochiai

Akihiro Suzuki

Hideto Iwamoto

Yoshihiro Domon

Kohtaroh Watanabe

Kouichiro Hattori

A method of manufacturing an electrode for electrical-discharge surface treatment includes increasing oxygen content in the powder; mixing the powder, in which the oxygen content is increased, with an organic binder and a solvent to prepare a liquid mixture; granulating the powder in the liquid mixture to form granulated powder; and forming the granulated powder to prepare a compact in which an oxygen concentration ranges from 4 weight % to 16 weight %.

Method of manufacturing electrode for electrical-discharge surface treatment, and electrode for electrical-discharge surface treatment

An electrical discharge surface treatment method for forming a coating film by generating a pulsed electrical discharge between an electrode and a workpiece in working fluid or gas using a green compact obtained by molding metal powder or metal alloy powder or a molded body obtained by heating the green compact as the electrode, and by melting an electrode material by an energy of the pulsed electrical discharge, forming a coating of the electrode material or a coating of a material obtained by a reaction of the electrode material by the energy of the pulsed electrical discharge on a surface of the workpiece, the electrical discharge surface treatment method includes generating the pulsed electrical discharge by mixing together two or more types of pulsed electrical discharges having different energies.

Electrical discharge surface treatment method

A microhole electric discharge machining apparatus that forms a conical inverse-tapered hole on a workpiece by a thin wire electrode, includes, an electrode holder that holds an upper part of the thin wire electrode and feeds a lower part of the thin wire electrode downward to stretch the lower part to the workpiece by rotating the thin wire electrode; a first guide member that is arranged near the workpiece upper surface and is provided with a first guide hole through which the thin wire electrode is penetrated on a hole-machining axis; a second guide member that is arranged between the first guide member and the electrode holder and is provided with a second guide hole through which the thin wire electrode is penetrated at a position eccentric from the hole-machining axis; and a swivel driving unit that circularly swivels the second guide member around the hole-machining axis.

Microhole electric discharge machining apparatus and electric discharge machining method

The tension measuring unit that measures a physical amount corresponding to tension of a wire in a wire transport system, the fluctuation recording unit that records the physical amount measured by the tension measuring unit, the fluctuation analysis unit that obtains an average value, variation, and frequency analysis data of the recorded physical amount as an analysis result of the physical amount, the maintenance necessity determining unit that compares the analysis result with a reference value and determines whether maintenance is needed based on a comparison result and the display unit that displays a determination result are included, and it is made possible to accurately determine the time for maintenance for various components used in the wire transport system without using a measuring instrument.

Maintenance system for wire transport system of wire discharge processing machine

To form a coating film having an excellent wear-resistant property in a temperature range from low temperature to high temperature a coating-film forming method includes a metal-powder producing step of producing a metal powder containing an element exhibiting a lubricating property when oxidized; an oxidizing step of oxidizing the metal powder so that an amount of oxygen contained in the metal powder is within 6 weight % to 14 weight %; and a coating-film forming step of forming a coating film on a material subject to a treatment, the coating film having such a composition that an area where an oxygen content is 3 weight % or less and an area where an oxygen content is 8 weight % or more are distributed in a unit area of the coating film when the metal powder is in a melted state or a semi-melted state, and an oxygen content of the entire coating film after the metal powder is melted or semi-melted being within 5 weight % to 9 weight %.

Coating film and coating-film forming method

In an electric discharge machining, in order to reduce damage of an object to be machined and an electrode and to achieve machining velocity enhancement and reduction of electrode wear amount by appropriately controlling a short-circuit current that flows when the electrode and the object to be machined are short-circuited, an electric-discharge-machining power supply apparatus for machining an object to be machined by interrupting every predetermined time period pulse trains that are turned on and off at predetermined timing, to supply electric power to a machining gap between a machining electrode () and the object () to be machined includes: a short circuit detecting means () for detecting a short circuit at the machining gap between the machining electrode () and the object () to be machined; and a pulse halting means () for, when the short circuit detecting means () detects a short circuit occurrence at the machining gap, halting generation of particular pulses in the pulse train so as to halt the power supply to the machining gap.

Electric-discharge-machining power supply apparatus and electric discharge machining method

In order to obtain an electric-discharge-machining power supply apparatus that can flow discharge current pulses through the machining gap uniformly and efficiently, and can realize reduction of the amount of electrode wear in machining in the alternate current pulse system, in an electric-discharge-machining power supply apparatus () for applying electric-discharge-machining pulse voltage to a machining gap between a machining electrode () and an object () to be machined, wherein a circuit () composed of a parallel connection of a rectifying element () and a resistive element () is inserted in series along a wiring path extending from an electric-discharge pulse generating unit () to the machining gap, and the rectifying element () is so connected as to cause machining pulse currents to flow in an intended direction during the electric discharge generation.

Electric-discharge-machining power supply apparatus and small-hole electric-discharge machining apparatus

Electric discharge machine

A wire cutting electric discharge machine has a high frequency voltage applying unit that applies a high frequency voltage and a direct current voltage applying unit applies a direct current voltage to the gap between the wire electrode and the workpiece. A detecting unit detects a low frequency component of a voltage occurring in the gap as a result of the electric discharge. The apparatus controls a feed rate based upon the state of the gap determined by the detecting unit.

Wire electrical discharge machining apparatus

A system is provided which has proved to be advantageous in avoiding electromigration-induced failure problem. Electric current density along a path along which a condutor line lies is determined by calculation. When the determined electric current density is not less than a predetermined value, a buffer is automatically inserted into the path.

Growing community of inventors

Tokyo, Japan

Kazushi Nakamura