Mitsubishi Electric Corporation

Hitachi, Ltd.

Mitsubishi Denki Kabushiki Kaisha

Nec Corporation

Hitachi Ulsi Engineering Corp.

Oki Electric Cable Co., Ltd.

Mitusbishi Denki Kasushiki Kaisha

Takayuki Nakagawa

Yoshihito Imai

Shigeo Nagashima

Koichiro Omoda

Yasuhiro Inagami

Hidetaka Miyake

Yoshiharu Kazama

Shunsuke Miyamoto

Yoshiaki Kinoshita

Takashi Hashimoto

Teruo Tanaka

Takashi Yuzawa

Yuto Sasaki

Yoshio Takamine

Tomoaki Takada

Ieyoung Kim

Yasuo Onodera

Yuhei Domori

Hiroshi Yoshikawa

Shunichi Torii

Yoshiko Yasuda

Tatsushi Sato

Tatsuo Higuchi

Tadaaki Isobe

Yoshiko Tamaki

Shigeo Takeuchi

Naotake Mohri

Hiroshi Tezuka

Yoshikazu Ukai

Hidetaka Katougi

Mamoru Sugie

Junji Nakagoshi

Satoshi Ohkubo

Yoichi Otomo

Hajime Ogawa

Yuji Saeki

Tatsuru Toba

Hideyuki Masui

Hiroshi Sugie

Masayuki Miyoshi

Yuki Hashimoto

Mitsuaki Akune

Koki Nakane

Satoru Izawa

Nobuyuki Ikuta

Yoichiro Kimoto

Junpei Yamasaki

Yuji Miura

Hengbo Su

Nagao Saitoh

Kenichi Oohashi

Daisuke Sekimoto

Yuma Shibuya

Makoto Nii

Hiroyuki Takeda

Jun Maruta

Yuji Nasu

Koichiro Chikahisa

Shigeaki Tokuda

Masato Terashima

Provided is a control device for a wire spark erosion machine, the control device controlling a drive trajectory of an electrode, a machining speed, and an electrical discharge frequency, the control device including a storage device and a computation device. The storage device stores at least one of data selected from an inter-electrode average voltage, the electrical discharge frequency, the machining speed, and the drive trajectory in an (n−1)-th machining, where n is an integer of two or more. The computation device calculates an inter-electrode distance in an n-th machining using a calculation model indicating a relationship between the data in the (n−1)-th machining and a machining shape of the workpiece, and computes, from the inter-electrode distance, at least one command value selected from the machining speed, the electrical discharge frequency, and the drive trajectory in the n-th machining.

Control device for wire spark erosion machine and control method for wire spark erosion machine

A machining condition searching method includes: generating a machining condition to be set in a machining device; collecting a machining state; collecting the machining result performed under the machining condition; calculating an evaluation value of the machining on the basis of the machining result; constructing an evaluation value prediction model predicting, on the basis of the machining condition, the machining state, and the evaluation value, an evaluation value corresponding to the machining condition that has not been tried; and constructing the evaluation value prediction model on the basis of a change degree in the relationship between the machining condition and the evaluation value, and performs weighting based on the machining state on the evaluation value prediction model. The machining condition to be tried next is generated using a predictive value of the evaluation value. Each of the above processes is repeatedly performed until it is determined to end a search.

Machining condition searching device and machining condition searching method

A commodity monitoring device includes a commodity state detection unit configured to, on the basis of image information of a commodity group area set on a commodity shelf, detect removal of a commodity in a quantity satisfying a predetermined condition from the commodity group area; and a change detection information output unit configured to, if the commodity state detection unit has detected the removal, output to an output destination device change detection information including image time-series data of the commodity group area from a point in time at which the commodity state detection unit detected the removal to a predetermined past point in time.

Commodity monitoring device, commodity monitoring system, output destination device, commodity monitoring method, display method and program

A wire electric discharge machine for machining a workpiece by causing a discharge between a wire electrode delivered from a wire bobbin and the workpiece. The wire electric discharge machine includes: a remaining length calculation unit that calculates a remaining length of the wire electrode based on electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin. The electrode winding coefficients depend on a winding density of the wire electrode, an inner width of the wire bobbin, a wire diameter of the electrode wire, and a winding tension of the wire electrode. The bobbin draw-out radius correlation information is correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin.

Wire electric discharge machine

To provide an electrode wire for electrical discharge machining including &#x3b2;-brass and &#x3b3;-brass arranged on an outer peripheral surface of a core and a method of manufacturing the electrode wire, capable of enhancing wire connection performance and cutting down manufacturing cost while trying to increase a processing speed. The electrode wire for electrical discharge machining according to this invention comprises: an external layer including &#x3b2;-brass and &#x3b3;-brass; and a core having an undulating shape formed at a boundary surface with the external layer. The &#x3b2;-brass and the &#x3b3;-brass are arranged densely and sparsely at the boundary surface of the undulating shape. The method of manufacturing an electrode wire for electrical discharge machining according to this invention comprises: a thermal processing step of executing thermal process on a base material under a predetermined thermal processing condition, the base material having a core with a zinc-coated surface; and a wire drawing step of drawing a base wire under a predetermined wire drawing condition provided with &#x3b2;-brass and &#x3b3;-brass formed at the surface of the core by the thermal process to make the &#x3b3;-brass reach the core, thereby forming a boundary surface of the core with an external layer into an undulating shape.

Electrode wire for electrical discharge machining and method of manufacturing electrode wire for electrical discharge machining

A wire electrical discharge apparatus includes a wire bobbin on which a wire electrode is wound, a straightening treatment unit to perform straightening treatment on the wire electrode fed from the wire bobbin, a machining power supply to apply a voltage between the wire electrode and a workpiece via a feed terminal set above the workpiece and contacting the wire electrode, and a control unit to control the straightening treatment unit and the machining power supply so as to apply a voltage between the workpiece and the wire electrode that has been subjected to the straightening treatment, to perform electrical discharge machining to form an initial hole in the workpiece.

Wire electrical discharge apparatus and initial hole machining method

A control device includes an interpolar average machining voltage detection unit that detects an interpolar average machining voltage between an electrode and a workpiece, an interpolar average machining voltage correction unit that corrects the detected interpolar average machining voltage, a machining speed control unit that calculates a machining speed of the electrode based on the difference between the set voltage, which is set in advance as a target value of the interpolar average machining voltage, and the corrected interpolar average machining voltage, and a drive control device that controls a machining speed of the electrode based on the calculated machining speed. The interpolar average machining voltage correction unit corrects the detected interpolar average machining voltage based on a difference between the calculated machining speed and the set speed, which is set in advance as a target value of the machining speed.

Control device for wire electric discharge machine and control method for wire electric discharge machine

An electric discharge machining apparatus includes a power supply, an electrode gap formed from an electrode and a workpiece, a current limiting resistor connected between the power supply and the electrode gap, switching elements that turns on and off application of a voltage from the power supply to the electrode gap, an inductance element connected in series between the switching elements and the electrode gap, and a control unit that controls the switching elements. The control unit causes the switching elements to perform ON/OFF operations according to a switching pattern having an on-pulse time width (&#x394;Ton) in which a voltage of the electrode gap can reach a voltage value of the power supply in an on-pulse time and a pause time width (&#x394;Toff) equal to or longer than a time width (&#x394;tic) of a discharge current flowing during the capacitor discharge and shorter than a cycle (&#x394;Tso) of the self-excited oscillation.

Electric discharge machining apparatus

The present invention includes drive unitsandthat change a relative position between a wire electrodeand a workpieceby moving a position of wire guideand, drive control unitsandthat drive the drive unitsandbased on a machining shape on the workpiece, respectively, a correction-amount storage unitthat previously stores therein a position correction amount for the wire electrodecorresponding to a machining condition, a correction-amount reading unitthat reads the position correction amount corresponding to the machining condition from the correction-amount storage unit, and a wire-position correction unitthat causes the drive control unitsandto correct a relative distance between the wire electrodeand the workpiecebased on the read position correction amount.

Wire electric discharge machining apparatus and control device

An electric discharge machining apparatus of the present invention includes a power supply, an electrode gap configured so as to be formed by an electrode and a workpiece, and an earth floating-capacitance current-suppressing coil configured to be inserted between the power supply and the electrode gap. Accordingly, the impedance in the charging path from the power supply to an interelectrode capacitance (an interelectrode parallel capacitor and an interelectrode parallel floating capacitance) can be decreased, and the impedance in the charging path to an earth floating capacitance can be increased, thereby enabling the electric current from the earth floating capacitance during discharge machining to be suppressed.

The present invention includes a post-cooling temperature sensor that measures a temperature of the machining fluid immediately after being cooled by a cooling device as a post-cooling fluid temperature, and an intra-tank temperature sensor that measures a temperature of the machining fluid in a work tank as an intra-tank fluid temperature, for a cooling control device that controls a fluid temperature of the machining fluid in a wire electric discharge machining apparatus, and the cooling control device has a first temperature-feedback control unit that feeds back the post-cooling fluid temperature into a cooling instruction value as an instruction value for the cooling device, and a second temperature-feedback control unit adjusts the cooling instruction value by feeding back the intra-tank fluid temperature to cause the intra-tank fluid temperature to follow a target temperature.

Wire electric discharge machining apparatus and cooling control device

A control device of the wire electric-discharge machining apparatus includes a speed-ratio computing unit that calculates machining speed information related to a corner machining speed in a corner machining portion corresponding to an amount of machining in the corner machining portion, on the basis of NC data, a feedback machining-speed computing unit that calculates, as a feedback machining speed to be used for feedback control of wire electric-discharge machining, a machining speed corresponding to an inter-electrode state between a wire electrode and a workpiece measured during wire electric-discharge machining, and a multiplier that calculates a machining speed to be used for control of a machining device at a time of machining the corner machining portion, on the basis of the machining speed information and the feedback machining speed.

Wire electric-discharge machining apparatus, wire electric-discharge machining method, and control device

The automatic wire-threading device includes a wire feed motor that drives a wire feed roller in a feeding direction, a wire-feed-motor control unit that outputs a feeding-direction rotation-speed reference to the wire feed motor at a time of a threading operation of a wire electrode and that reduces torque in a feeding direction when a detected rotation speed of the wire feed roller is larger than the feeding-direction rotation-speed reference, a wire collecting motor that drives a wire collecting roller in a collecting direction, and a wire-collecting-motor control unit that outputs a predetermined wire-collecting-roller speed reference to the wire collecting motor to collect a wire. The wire-feed-motor control unit limits torque so that an absolute value of motor torque in a winding-back direction of a wire feed roller is smaller than an absolute value of motor torque in a feeding direction.

Automatic wire-threading device

In order to detect a wire breakage as soon as possible, the wire electrical discharge machining apparatus includes a speed fluctuation compensator that generates a speed fluctuation suppression command that is a speed compensation value that suppresses fluctuation of the rotational speed of the tension motor on the basis of the rotational speed of the tension motor and a breakage detecting device that detects a breakage of the wire electrode on the basis of a comparison of a preset breakage detection threshold and a speed fluctuation suppression command output from the speed fluctuation compensator.

Wire electrical discharge machining apparatus

A wire travelling device including a wire-feed-roller circumferential-speed calculation unit and a wire-collection roller circumferential-speed calculation unit that calculate each circumferential speed of the wire feed roller and the wire collection roller, a circumferential-speed-difference holding unit that calculates a difference between the circumferential speed of the wire feed roller and the circumferential speed of the wire collection roller as a circumferential speed difference and holds therein the calculated circumferential speed difference, and a wire-feed-roller speed control unit and a wire-collection roller speed control unit that control the wire feed roller and the wire collection roller, in changing a traveling speed of the wire, by a wire-feed-roller speed instruction value and a wire-collection roller speed instruction value generated so that the circumferential speed difference before changing the traveling speed of the wire is maintained after the changing.

Wire traveling device

Growing community of inventors

Tokyo, Japan

Takayuki Nakagawa