Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubishi Denki K.k.

Nippon Steel Chemical Co., Ltd.

Kabushiki Kaisha Toshiba

Hisashi Yamada

Takashi Hashimoto

Akihiro Goto

Kazuo Watabe

Yuji Nagai

Akihito Ogawa

Chosaku Noda

Naomasa Nakamura

Naoki Morishita

Takuji Magara

Tatsushi Sato

Koichiro Hattori

Seiji Sato

Hisakatsu Kawarai

Yoji Nakajima

Takeshi Iwasaki

Syuichiro Ishihara

Yutaka Terada

Masao Akiyoshi

Kazuto Kuroda

Keiki Yamada

Toshihiko Kaneshige

Yasuo Onodera

Yoshikazu Ukai

Yoichi Otomo

Yoshihito Imai

Toshio Suzuki

Seiji Satou

Kunihiko Nakagawa

Jyunichi Aizawa

Hiroshi Nakao

Nobuhisa Yoshida

Hideaki Ohsawa

Masashi Kaji

Hiroharu Sato

Hiroyuki Ooguro

Takaaki Kase

Ryogo Koba

Kiyoshi Koike

Makoto Sakuwa

Ichirou Furuki

Shuichiro Ishihara

Yasushi Endou

Yoshihito Matsuura

Shuuichiro Ishihara

Yooji Nakajima

Nobumasa Naito

In a wire electrical discharge machining apparatus, an upper main-discharge power supply is connected between an upper conducting terminal and a workpiece using an upper main-feeder line capable of configuring outward and homeward paths, and a lower main-discharge power supply is connected between a lower conducting terminal and the workpiece using a lower main-feeder line capable of configuring outward and homeward paths. Moreover, a sub-discharge power supply is connected between the upper conducting terminal and the workpiece and between the lower conducting terminal and the workpiece using an upper and a lower sub-feeder lines that have higher impedances than the impedances of the upper and the lower main-feeder lines and can configure outward and homeward paths.

Wire electrical discharge machining apparatus

A first cutter(cutting unit) is provided between a color recording unit(the first printing unit) and an overcoat recording unit(the second printing unit). A portion whereon color printing is completed by the color recording unitof a recording paper(printing medium) is cut off by the first cutterand detached. An overcoat recording unitperforms an overcoat process on the detached recording paper (printing medium strip). In parallel with this, the color recording unitperforms next color printing on the recording paper. This makes it possible to reduce a printing time in a printing device including a plurality of printing processes without deteriorating printing quality. Further, an useless paper feeding is eliminated by optimally arranging the color recording unit, the first cutter, the overcoat recording unit, and the second cutter, etc. in accordance with a size of a printing area.

Printing method and device having first and second printing units

A wire electrical discharge machining apparatus includes a unit capable of separately opening and closing each of a high impedance path and a low impedance path, a unit that sets an open/close pattern in which a combination of closing one of the feeding paths and opening another one of the feeding paths is designated for switching power feeding between the high impedance path and the low impedance path, a unit that changes pulse energy per feeding pulse in a present feeding path to reduce a difference in discharge pulse energy applied to an inter-electrode gap from a machining power supply between at a time of high-impedance-path feeding and at a time of low-impedance-path feeding, and a unit that controls opening and closing of the path open/close unit in accordance with the changed open/close pattern.

Target fluid is made into electrolyte solution when measured fluid-quality value is lower than a first condition value, by substituting an impurity anion contained in the target fluid with a predetermined anion and substituting an impurity cation contained in the target fluid with a predetermined cation, and purified when the fluid-quality value is higher than a second condition value. The above procedures are repeated, so that the fluid-quality value of the target fluid falls within a predetermined range, to make the target fluid into electrolyte solution with a correlation between pH and conductivity.

Fluid-quality control method, fluid-quality control apparatus, and electric-discharge machining apparatus employing the same

A wire electric discharge machine includes a wire electrode; a machining power supply that supplies a machining current to between the wire electrode and a workpiece. The machine further includes a first power feed contact and a second power feed contact that respectively feed power to the wire electrode; a first machining-current loop in which a first machining current flows from the first power feed contact toward the workpiece; a second machining-current loop in which a second machining current flow from the second power feed contact toward the workpiece; an impedance switching circuit that is provided in at least any one of the first machining-current loop and the second machining-current loop; and a control unit that controls a flow ratio of the first machining current and the second machining current by changing an impedance of the impedance switching circuit.

Wire electric discharge machine with impedance switching

An electrical-discharge machining apparatus for machining a workpiece using an aqueous machining fluid includes an insulator for electrically insulating a machine platen from the workpiece where the workpiece is placed. A machining-fluid-property measuring instrument measures the state of the machining fluid; and a machining-fluid-property controller maintains the pH of the machining fluid so as to be kept within 8.5 through 10.5.

Electrical discharge machining apparatus and electrical discharge machining method

A machining-energy calculating unit accumulates a discharge current value for each discharge position to calculate a machining energy in a certain time period from the present time to the past time. An energy-distribution changing unit determines the presence or absence of imbalance in the energy by obtaining a machining energy distribution in an up-down direction of the machining gap based on the machining energy, and when there is imbalance, the energy-distribution changing unit produces a new open/close pattern in which a machining energy distribution that eliminates the imbalance. Power feeding is then performed based on the new open/close pattern.

A wire-discharge machining apparatus controls a short circuit between a wire electrode and a workpiece and wire-breakage, and makes it easy to improve productivity, by performing power supply control to mix an upper-side power supply state in which a high-frequency pulse voltage is applied from an upper-side power supplying unit, a lower-side power supply state in which the high-frequency pulse voltage is applied from a lower-side power supplying unit, and a both-sides power supply state in which the high-frequency pulse voltage is applied to the wire electrode from both power supplying units in synchronization with each other during a period of electric discharge machining.

Apparatus for machining a workpiece using wire discharge including an upper and lower power supply unit

In an electric discharge machining apparatus that machines a workpiece () by using a water-based dielectric fluid as a dielectric fluid while a voltage is being applied to a machining gap between an electrode () and the workpiece (), the electric discharge machine includes: an anticorrosive power source section () that applies a predetermined voltage by taking the workpiece () as a cathode and taking as an anode an anticorrosive electrode () opposing the workpiece () with an insulator () therebetween; a dielectric fluid quality measuring instrument () that measures a quality of the dielectric fluid; and a dielectric fluid quality control section () that controls a pH level of the dielectric fluid to be within a range from 8.5 to 10.5 on the basis of the measured result of the dielectric fluid quality measuring instrument ().

Electric discharge machine and electric discharge machining method

This invention relates to epoxy resins containing indole as structural unit, indole resins and resin compositions containing said epoxy resins and indole resins useful for applications such as laminating, molding, casting and adhesion on account of their excellent fire retardance, adhesiveness, moisture resistance and heat resistance. The indole resins of this invention and the epoxy resins obtained therefrom are represented by the following general formulas I and II wherein Ris H, alkyl or the like, X is a crosslinking group represented by &#x2014;C(RR)&#x2014; or C(RR)&#x2014;Ar&#x2014;C(RR)&#x2014; (wherein R-Rare H, alkyl or the like and Ar is a benzene or biphenyl ring), G is glycidyl group and n is an integer of 1-20.

Indole resins epoxy resins and resin compositions containing the same

A machining-fluid ejection device for a wire electric discharge machining apparatus includes a nozzle for ejecting machining-fluid into an inter-electrode gap between a workpiece (W) and a wire electrode (E), a casing () fixed to a machining head () disposed above or below the workpiece (W), a coupling member () for coupling the casing () and a nozzle (), having a predetermined elastic coefficient, and deforming according to the machining-fluid pressure; an assemblage of the coupling member () and the nozzle () has hollow portions, formed with an inlet side internal diameter (D) and an outlet side internal diameter (D) on a machining-fluid inlet side and outlet side respectively, whose sectional areas do not change, and a hollow portion, formed with a minimum internal diameter (D) between the machining-fluid inlet side and the outlet side, whose sectional area does not change. Machining productivity may be raised for nozzle contact machining and nozzle separation machining.

Working liquid ejector of wire electric discharge machine

Machining electrical power supply device for wire electrical discharge machining. Includes an electrical discharge state distinguishing circuit () for distinguishing at least two inter-electrode states, including electrical shorting and normal electrical discharge, between a wire electrode (E) and a workpiece (W), and an inter-electrode current waveform control means for supplying, and for switching between supply of, a triangular wave and a trapezoidal wave current to the electrodes. According to the inter-electrode state distinguished by the electrical discharge state distinguishing circuit (), in cases where the inter-electrode state is that of electrical shorting (Y), the inter-electrode current waveform control means supplies a triangular wave current (I) to the electrodes, and in cases where the inter-electrode state is that of normal electrical discharge (Y), it supplies a trapezoidal wave current (I) to the electrodes. Breakage of the wire electrode (E) can be avoided and machining speed can be improved.

Machining power supply for wire electrical discharge machine

Wire electric discharge machine in which traveling direction of wire electrode is changed by lower roller arranged at lower portion of a workpiece, wire electrode is held and pulled by capstan roller and pinch roller, and electric power is supplied between wire electrode and workpiece while wire electrode is traveling so that workpiece is machined by electric discharge energy, capstan roller and pinch roller are arranged so that angle &thgr; by which the traveling direction of wire electrode is changed by capstan roller and pinch roller, can be 0&deg;<&thgr;<90&deg; directed upward with respect to traveling direction of wire electrode, direction of which is changed by lower roller. Breakage of wire electrode can be supressed. Feed of wire electrode can be automated. When wire cutter is used, entry of machining solution into wire cutter can be prevented. When wire cutter is not used, accommodation of used wire electrode can be enhanced.

Wire electric discharge machine

A green-compact electrode ( ) for discharge surface treatment for use in a discharge surface treatment operation for forming a hard coating film ( ) on the surface of an object ( ) which must be machined by performing a discharging operation in working fluid ( ) is structured such that powder ( ) made of metal, such as W or Ti, and fluid ( ) which is the same as working fluid are mixed with each other, and the mixed substance is compression-molded so that the green-compact electrode ( ) for the discharge surface treatment is obtained.

ELECTRODE OF GREEN COMPACT FOR DISCHARGE SURFACE TREATMENT, METHOD OF PRODUCING THE SAME, METHOD OF DISCARGE SURFACE TREATMENT, APPARATUS THEREFOR, AND METHOD OF RECYCLING ELECTRODE OF GREEN COMPACT FOR DISCHARGE SURFACE TREATMENT

An automatic wire feeder of a wire electric discharge machine includes an optical sensor for detecting positional information of a wire electrode in an inserting passage between a feed roller for feeding a wire electrode and an upper wire guide; and a control unit for discriminating a state of vibration or deflection of the wire electrode according to the positional information detected by the optical sensor and also for controlling a feeding and rewinding motion of the feed roller according to a quantity of deflection of the wire electrode. Due to the foregoing, buckling caused by an inserting load in the process of automatic wire connection can be positively detected, and the reliability can be enhanced and further the repetition of connecting the wire again can be reduced.

Automatic wire electrode feeder for wire electric discharge machining devices

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Tokyo, Japan

Hisashi Yamada