Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Hiroatsu Kobayashi

Takuji Magara

Seiji Satou

Yasuo Onodera

Yoshikazu Ukai

Takahiro Shiozawa

Ken Inukai

Masayuki Hara

Kyoichi Ebashi

A control apparatus of the present invention includes a weight calculating unit that calculates weight of a core on the basis of an NC program and a first input from a user designating a material and a thickness of work, a fixing-necessary-distance calculating unit that calculates a fixing distance on the basis of the weight of the core, a fixing-position calculating unit that sets fixing positions such that a total length of the fixing positions is equal to the fixing length, a fixation-condition setting unit that calculates a machining condition setting value for fixation on the basis of the first input, and a machine driving unit that drives the wire electric discharge machine on the basis of the NC program and causes the wire electric discharge machine to machine places set in the fixing positions by applying machining conditions for fixation.

Control apparatus and machining method for wire electric discharge machine

A wire electrical discharge machining apparatus includes a target-control-section calculating unit calculating a target control section, which is indicated by a start point and an end point of the corner control in a current electrical discharge machining during the finish machining, based on a machining parameter; an actual-control-section calculating unit correcting the start point and the end point of the corner control, which are indicated in the target control section calculated by the target-control-section calculating unit, and calculating an actual control section, based on a magnitude of a shape error of the corner portion in a previous electrical discharge machining during the finish machining; and a speed controlling unit controlling the feed speed of the wire such that an amount of machining per unit time in the actual control section becomes equal to that when a portion other than the corner portion is machined.

Wire electrical discharge machining apparatus

A numerical control device for a wire electric discharge machining apparatus generates a wire-breakage sign signal, outputs a machining-condition re-setting instruction and wire-breakage threshold re-setting instruction from the wire-breakage sign signal and wire-breakage threshold, sets the wire-breakage threshold according to the wire-breakage threshold re-setting instruction and a wire-breakage signal, calculates a machining energy from a discharge pulse count, measures a machining speed from position information, calculates a board thickness of the workpiece from the machining energy and machining speed, outputs, according to a predetermined algorithm, a machining-condition switching instruction from the board thickness, the machining-condition re-setting instruction, and the wire-breakage signal, sends an oscillation instruction to a oscillator and sends a shaft feed instruction to a servo amplifier so that the machining condition is set to one determined by the machining-condition switching instruction, and stores the machining condition and wire-breakage threshold that correspond to each board thickness.

Numerical control device, wire electric discharge machining apparatus using the same, and wire electric discharge machining method using the same

The electric power unit for machining of a wire electric discharge machine includes an electric discharge state discriminate or () for discriminating a state of electric discharge generated between the electrodes and an impression voltage selecting means () for inverting the polarity of the electric discharge inductive pulse voltage from the previous electric discharge inductive pulse voltage when an electric discharge state between the electrodes is discriminated to be abnormal (Y) or open (Y) and for making the polarity of the electric discharge inductive pulse voltage to be the same as the polarity of the previous electric discharge inductive pulse voltage when the electric discharge state between the electrodes is discriminated to be normal (Y).

Electric power unit for machining of wire electric discharge machine

A wire discharge machining method that involves decreasing gradually a discharge energy from a position (point A) a first predetermined distance (Lpre) prior to a corner portion entry (point B) on machining path of a wire electrode ( ), stopping a relative movement between the wire electrode ( ) and the workpiece ( ) at a corner portion entry (point B), releasing the stopped movement in accordance with a predetermined decision criterion, working the workpiece from the point B to a position (point D) a second distance (L) away from a position (point C) after passing the corner portion with a lower discharge energy that is reduced at a certain reduction to the discharge energy at point A, and working the workpiece by increasing gradually the discharge energy from point D to a position (point E) passing a third distance (Lpost).

Wire electric discharge machining of corners

A wire electrical discharge machining apparatus provided with: a nozzle for spraying and supplying machining liquid, the nozzle being supported so that a state of the nozzle is switched over from a contact state with a work piece to a non-contact state with the work piece, and vice versa; a spring acting on the nozzle in a direction to make the nozzle move away from the work piece; a pump for changing and controlling a hydraulic pressure of the machining liquid; and electrical conduction switch-over apparatus by which power supply to the work piece is switched over from the nozzle of a conductor to apparatus other than the nozzle, and vice versa, such that the hydraulic pressure of the machining liquid during electric discharge machining is changed and controlled by the pump so that the state of the nozzle is switched over from the contact state to the non-contact state.

Growing community of inventors

Tokyo, Japan

Hiroatsu Kobayashi