Electric heating – Metal heating – Cutting or disintegrating
Patent
1992-11-19
1994-07-19
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 710
Patent
active
053311299
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of the Invention
The present invention relates to an upper guide assembly for a wire cut electric discharge machine including an automatic wire feeding mechanism.
2. Description of the Related Art
An explanation will be given with reference to FIGS. 4 and 5. In a wire cut electric discharge machine, a wire 1 which functions as one electrode is looped as schematically shown in FIG. 4. More particularly, the wire 1 drawn out of a wire reel 2 is fed to a feed roller 11 through a first guide roller 3, brake pinch roller 4, brake shoe 5, second guide roller 6, upper guide assembly 7, workpiece 8, lower guide 9, and third guide roller 10.
The upper guide assembly 7 includes an electrode roller 12 and an electrode pinch roller 13. These rollers 12 and 13 are disposed to face each other, with a wire path a defined therebetween. The lower guide 9 includes a lower die guide 14. Reference numeral 15 denotes a feed pinch roller which is in urged contact with the feed roller 11.
During wire cutting operation, the electrode roller 12 and the electrode pinch roller 13 pinch the wire 1 therebetween and are in contact with the wire 1 to supply machining power to the wire 1. Further, the wire 1 is drawn out of the wire reel 2 by the feed roller 11, and is fed forward, while a predetermined tension is applied to the portion of the wire 1 which is located between the brake shoe 5 and the feed roller 11, or located at an electric discharge machining position (the position of the workpiece 8). The brake shoe 5 rotates at a speed which is lower than a feed speed of the wire 1 by the feed roller 11 to provide resistance against movement in the direction along which the wire is drawn out, thereby applying aforesaid tension to the wire 1.
Incidentally, control of the tension and feeding speed of the wire 1, control of the movement of the workpiece 8 in the X-axis and Y-axis directions for cutting the workpiece 8 into a desired configuration, or other control, are executed by a numerical control device (NC unit) which is included in the wire out electric discharge machine.
In the case of the wire cut electric discharge machine which includes an automatic wire extension mechanism, a wire-break detecting switch 16, hold rollers 17, 17, wire feeding unit 18, and carrying belts 19, 19 are additionally provided along the wire path a.
The wire feeding unit 18 is attached to the upper guide assembly 7, and is provided at its lower portion with a service arm 20. The service arm 20 is not only vertically movable but also rotatable, so that its distal end portion can be located at a position just under the upper guide assembly 7 and at a home position to be reached by moving upward after retreating from the previous position. Further, a wire cutter 21 and a connecting jet nozzle 22 are attached to the distal end portion of the service arm 20.
The upper guide assembly 7 is provided with a body 23 and an upper guide 24 mounted on a lower portion of the assembly body, as shown in FIG. 5 ("PRIOR ART").
The body 23 is formed at its center portion with a blind groove 25 (See FIG. 6 ("PRIOR ART")) in which a ruby guide 26, the electrode roller 12, the electrode pinch roller 13 disposed to face the roller 12, and hold rollers 17, 17 are mounted. These parts are arranged along the preset wire path a, and a guide axis of the ruby guide 26 is aligned with the wire path a. Moreover, the contacting positions between the electrode roller 12 and the electrode roller 13, and between the hold rollers 17 and 17, are so designed as to be situated on the wire path a.
The electrode pinch roller 13 is mounted on the distal end of an arm 28, which is disposed for rotation around a shaft 27, and is always urged towards the electrode roller 12 by means of a spring 28a. When a lever 29 fixed to the arm 28 is upwardly driven by an air actuator 30, the roller 13 is separated from the electrode roller 12. The air actuator 30 has an air supply port 31. Reference numeral 32 denotes a supply port for the machining fluid.
The upper guide 24 includes a h
REFERENCES:
patent: 5055649 (1991-10-01), Iwasaki et al.
Aso Toshiyuki
Kita Yuki
Evans Geoffrey S.
Fanuc Ltd.
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