Fanuc Corporation

Fujitsu Fanuc Limited

Gotaro Gamo

Mitsuo Kinoshita

Yoshiyuki Nomura

Haruki Obara

Hideo Katsube

Kanemasa Okuda

Norio Karube

Toshiyuki Aso

Tamotsu Ishibashi

Yutaka Koiwai

Sadahiro Watanabe

Hiromichi Shichida

Kiyoshi Hattori

Apparatus for selecting wire electrode type electrical discharge maching

Wire electrode guide apparatus in a wire-cut electric discharge machine

Automatic wire threading method

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

Method of reducing wire-cut electric discharge machining errors

Wire-cut electric discharge machine controller for compensating the

Wire-cut electric discharge machine control system to compensate for

Apparatus for processing a broken wire electrode used during

A system for restoring a numerically controlled machine tool to its former condition after a power interruption, the numerical control system being of the type in which a position sensor senses the current position of a movable member or of a drive motor of the machine tool and generates a current position signal in accordance with said current position, the movable member being positioned on the basis of a commanded position signal and the current position signal. The positional control information which prevails immediately prior to an interruption in the electric power which is applied to the machine tool and to the numerical control device is stored in a non-volatile memory before the power interruption occurs. When the electric power is reintroduced, the positional control information is read out of the non-volatile memory, and the movable member is returned to the position which it occupied immediately prior to the power interruption, this being accomplished on the basis of the positional control information and the current position signal.

System for restoring numerically controlled machine tool to former

Wire-cut electric discharge machining control method

A wire or band electrode type electric discharge machine for machining hard metals by an electric spark generated between the metal workpiece and a wire electrode which is fed longitudinally to provide a fresh supply thereof while a prescribed relative motion is established between the workpiece and the wire electrode. The invention provides a clamping mechanism on the wire supply side of the workpiece for clamping the wire electrode if it breaks during operation, and a wire electrode feed mechanism for automatically guiding the broken end of the wire through the opening that has been machined in the workpiece. A wire electrode pull-up mechanism is provided on the other side of the workpiece for gripping and pulling up the wire electrode. If the electrode wire breaks during a machining operation, the clamping mechanism immediately clamps the wire electrode and prevents it from falling under its own weight. Thereafter the wire electrode feed mechanism draws the broken wire electrode away from the surface of the workpiece and then reinserts the broken end through the opening until the end of the wire emerges from the opposite side. The wire electrode pull-up mechanism the grips the end of the wire and pulls it to a new position to restore operation after it has been released by the clamping mechanism.

Electric discharge machine

A method and apparatus for restoring a broken wire electrode in a wire electrode-type electric discharge machine for machining a workpiece into a desired shape while the workpiece is moved relative to the wire electrode on the basis of machining command data. For effecting the restoration of the wire electrode, memory means are provided for storing the relative machining starting position of the workpiece and the wire electrode at the machining starting point, and the relative wire electrode breakage position of the workpiece and the wire electrode when the wire electrode breaks. After the wire electrode breaks the relative position of the workpiece and the wire electrode is brought into coincidence with the machining starting position on the basis of information indicative of the machining starting position and the wire electrode breakage position. After the wire electrode is returned to a feed system therefor, the workpiece is again moved relative to the wire electrode from the machining starting point on the basis of the machine command data. The relative position of the workpiece and the wire electrode is made to coincide with the wire electrode breakage position, after which the discharge machining operation is resumed.

Method and apparatus for restoring a wire electrode

A numerically controlled wire-cutting electric discharge machine composed of a numerical control apparatus controlling a feeding of a piece of work on at least three axes and a wire-cutting electric discharge apparatus. The wire-cutting discharge apparatus comprises a pair of V type slot guides which stretch a wire therebetween, a first and a second drive means which displace the work in the direction of two axes with respect to the wire electrode and a third drive means which rotates at least one of the V type slot guides around a predetermined axis, so that the relative displacement between the piece of work and the wire electrode is controlled via the first and second drive means by two outputs of the numerical control apparatus, the V type slot guide is rotated via the third drive means by another output of the numerical control apparatus so that the V type slot guide is turned a predetermined angle in the direction of the above-mentioned relative displacement.

Numerically controlled wire-cutting electric discharge machine

Growing community of inventors

Hachioji, Japan

Gotaro Gamo