Electric heating – Metal heating – Cutting or disintegrating
Patent
1989-11-03
1991-09-03
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6914, B23H 710
Patent
active
050456610
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wire electrode guide apparatus for use in a wire-cut electric discharge machine having an automatic wire extension function, and more particularly to a three-point support type wire electrode guide apparatus which is capable of accurately supporting a wire electrode on a predetermined wire traveling path to improve machining accuracy.
BACKGROUND ART
In a wire-cut electric discharge machine arranged to effect electric discharge machining by producing electric discharge between a workpiece and a wire electrode (hereinafter referred to as wire), generally, the wire is supported and guided on a predetermined wire traveling path by the use of upper and lower guides which are respectively disposed above and below the workpiece, and at the same time, a working fluid is supplied between the workpiece and the wire from a nozzle hole formed in a nozzle which is attached to a housing of each guide integrally therewith so as to cool the wire and eliminate chips resulting from machining. Conventionally, in order to support the wire on the predetermined wire traveling path in a stable manner, a guide of a type having a V-shaped stationary piece (or a V-shaped groove) and a movable piece arranged to be pressed by an operating member of an actuator toward the stationary piece is employed for three-point supporting the wire by the movable and stationary pieces.
However, in the three-point support guide of the above-mentioned kind, a highly pressurized working fluid filled between the housing and the nozzle can penetrate into the interior of the actuator and act upon the operating member of the actuator so as to cause the operating member to be displaced from its predetermined wire support position in the direction away from the stationary piece. In this case, the actuator cannot apply a predetermined urging force on the wire via the movable piece of the three-point support guide, so that the wire cannot be accurately supported on the predetermined wire traveling path.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a wire electrode guide apparatus in a wire-cut electric discharge machine, which is capable of accurately supporting the wire on a predetermined wire traveling path to improve machining accuracy.
In order to achieve the above object, according to the present invention, a wire electrode guide apparatus in a wire-cut electric discharge machining comprises a guide body; a movable guide member disposed to be movable toward and away from the guide body for cooperating with the guide body to support a wire electrode; a fluid supply source for supplying a pressurized fluid; a fluid-operated actuator having a fluid-supplied section for receiving the pressurized fluid and an operating member arranged to apply an urging force to the movable guide member and release the urging force in response to prevention of and permission of supply of the pressurized fluid to the fluid-supplied section; switch means for causing the fluid-supplied section of the fluid-operated actuator to be selectively communicated to either one of the fluid supply source and outside the wire electrode guide apparatus; and a nozzle disposed opposite the guide body and formed with a nozzle hole for injecting a working fluid.
As mentioned above, according to the present invention, the fluid-supplied portion of the fluid-operated actuator for driving the movable guide member for supporting the wire electrode between itself and the guide body is arranged to be selectively communicated to either one of the fluid supply source and outside the wire electrode guide apparatus. Therefore, during electric discharge machining, even when a highly-pressurized working fluid filled in the interior of the wire electrode guide apparatus penetrates into the fluid-supplied section of the fluid-operated actuator, the thus penetrating working fluid can be discharged to the outside of the apparatus so as to prevent the fluid-operated actuator from operating in a direction releasing the ur
REFERENCES:
patent: 4564431 (1986-01-01), Miyano
patent: 4740667 (1988-04-01), Obara
Aso Toshiyuki
Gamo Gotaro
Watanabe Sadahiro
Evans Geoffrey S.
Fanuc Ltd
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