Fanuc Corporation

Fujitsu Fanuc Limited

Mitsuo Kinoshita

Gotaro Gamo

Haruki Obara

Yoshiyuki Nomura

Hideo Katsube

Etsuo Yamazaki

Teruyuki Matsumura

Ryoichiro Nozawa

Nobuaki Iehisa

Tsuyoshi Nagamine

Keiichiro Miyajima

Kanemasa Okuda

Hiroshi Araki

A wire electric discharge machine and a wire electric discharge machining method in which a workpiece set posture is compensated for an error. After a workpiece is set and fixed on a workpiece table, an upper guide measures three or more three-dimensional positions that are not situated on one straight line on an upper surface of the workpiece, utilizing detection of contact with the upper surface. A unit normal vector is obtained, and a shift amount for shift from an originally set vertical position to a corrected position is calculated. In machining, the shift amount is added to the position to compensate for an angle error of a machined surface, and a deviation of a machined point position caused by inclination of the workpiece is collaterally compensated for. Thus, the machined shape cannot be distorted, and the workpiece set posture error can be compensated for.

Wire electric discharge machine and wire electric discharge machining method

Method of correcting laser output power

To permit machining of a workpiece into a highly accurate tapered configuration, a wire-cutting EDM including a numerical controller that reads programmed shape data is utilized. To precisely taper the workpiece, it is necessary to move the upper and lower guides of the wire so that they start and stop moving simultaneously. From the programmed shape data, the respective speeds of the upper and lower guides are computed. The upper guid is interpolated by the upper guide speed, and the lower guide is interpolated by the lower guide speed so that the guides can start and stop moving simultaneously.

Taper cutting control method and control system in wire-cut electric

Cut contour display method in wire electric discharge machine

Wire EDM taper cutting method using path data of two planes of a

Taper cutting method

Electric discharge machining condition setting system

A method of automatically measuring the flexure value of a wire electrode 1 in a wire-cut electric discharge machine is disclosed. At a measurement point in the course of electric discharge machining, the electric discharge is temporarily stopped, and whether or not the wire electrode 1 and a workpiece 2 come into contact is sensed by a contact sensing device 107a. The wire electrode 1 and the workpiece 2 are moved relatively to advance or retreat in accordance with the sensed touch signal TS, and the distance .epsilon..sub.1 of movement until the contact state changes, is measured. The flexure value .epsilon. is obtained calculatively from the measured movement distance .epsilon..sub.1.

Method of measuring flexure value of wire electrode

A system for reversing the direction of an electric discharge machine in response to a short-circuit signal. A controller responds to the short circuit signal by generating a command signal with a magnitude greater than a stored error between a commanded value and a number of feedback pulses produced by rotation of a motor which drives the electrode. The sign of the generated command signal is opposite to that of the stored error so that the stored error is converted into a value capable of reversing the direction of the electrode without delay.

Method and apparatus for controlling direction reversal in electric

A method of electric discharge machining using a wire electrode for cutting a workpiece into a commanded shape by producing an electric discharge between the workpiece and the wire electrode and moving the wire electrode relative to the workpiece along a commanded path. The method includes steps of previously storing, in a computer memory, sets of machining conditions which differ depending upon workpiece material and thickness, reading, at the time the workpiece is to be machined, a predetermined set of the machining conditions from the memory in response to a machining condition selection instruction in a machining program and performing electric discharge machining in accordance with the set of machining conditions read from the memory.

Wire-cut electric discharge machining method using stored machining

Method of reducing wire-cut electric discharge machining errors

Wire-cut electric discharge machine controller for compensating the

Disclosed is a numerical control method for positionally controlling a movable element of a machine tool in such a manner that numerically controlled machining is performed along a projected path obtained by projecting a programmed path, lying on a predetermined plane, onto a plane of projection inclined at a predetermined angle with respect to the first-mentioned plane. The method includes the steps of entering data specifying a programmed path on the predetermined plane, subjecting the entered data to a projective transformation in accordance with entered projection angle data to generate projective transformation data specifying the projected path, and performing an interpolation on the basis of the projective transformation data to produce an output signal indicative of the results of the interpolation, and positionally controlling the movable element on the basis of the projective transformation output signal.

Numerical control method

Wire-cut electric discharge machine control system to compensate for

Growing community of inventors

Hachioji, Japan

Mitsuo Kinoshita