JPS61293727A - Wire cutting device - Google Patents

Abstract

PURPOSE:To enable the long time use of a wire cutting device by making an electrode get in contact with a used wire for the fusing thereof on currents supplied at a predetermined interval between electrodes. CONSTITUTION:One side of a lifting roll 17 made of an insulation material is provided with electrodes 21 at equal intervals along the periphery thereof, and as soon as the electrodes 21 have contacted a used wire 5 in a winding process by said roll 17, the wire 5 is made live between both electrodes 21 and 23, thereby fusing the live portion of the wire 5. After the finish of a fusing process, the lifting roll 17 continues to wind up the wire 5, thereby fusing the live portion and finally cutting the used wire 5 to a predetermined size, whenever the electrode 21 of the lifting roll 17 gets in contact with the wire 5. Therefore, as different from a conventional cutting method using a cutter, a device is free from a problem such as a cutter wear and can be used for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a wire cutting device for a wire-cut electrical discharge machine.

[Technical Background and Problems of the Invention] In general, used wires from wire-cut electric discharge machines are disposed of by winding them up on a reel, disposing of them in a box, or cutting them into pieces. ing.

Each of these methods has advantages and disadvantages. For example, when winding it up again with a reel or discarding it in a box, the processing voltage is applied to the used Y-V, so it is necessary to insulate the reel and box, which complicates the structure. There is a problem. Furthermore, when processing wire by cutting it into pieces, the wire is conventionally cut into a fixed size using a cutter such as scissors, which poses a problem in the durability of the cutter.

[Purpose of the Invention] The present invention was made in view of the above-mentioned conventional problems, and involves a method of fusing the wire by passing an electric current through it when cutting the used wire from electrical discharge machining into a certain size and processing it. However, it is an object of the present invention to provide a wire cutting device that eliminates the need for durability of the blade, unlike cutting with a cutter.

[Structure 1 of the Invention The present invention comprises a winding device for used electric discharge machined wire, an electrode that comes into contact with the wire sent by the winding device, and a power source that passes a cutting current to the electrode at regular intervals. This wire cutting device is equipped with a wire cutting device that continuously winds up a used wire and cuts the wire by melting it by passing a current through the wire at regular intervals.

[Embodiments of the Invention] FIG. 1 is an overall view of a wire-cut electric discharge machine 1,
The wire 5 fed out from the wire feeding reel 3 is adjusted to a strictly constant feeding speed by the pinch roller 7 and then fed to the electric discharge machining section 9.

In the electrical discharge machining section 9, an X-axis motor 11. A workpiece W is placed on a worktable 15 that is moved two-dimensionally in the XY plane by a Y-axis motor 13.
The wire 5 is inserted through the wire 5, and a voltage is applied between the workpiece W and the wire 5 to perform electric discharge machining on the workpiece W. The wire V5 used for electrical discharge machining is rolled up from the electrical discharge machining section 9 by a winding roller 17, and transferred to the wire cutting device 1.
Sent to 9th.

FIG. 2 shows this wire cutting device 19,
An electrode 2 is provided on one side of the winding roller 17 formed of an insulating material.
1 are provided at equal intervals on the circumference. Further, an electrode 23 is provided at a predetermined distance from the winding roller 17, and a power supply device 25 is connected between the electrodes 21 and 23.

Therefore, when the winding roller 17 winds up the used wire 5, the moment the electrode 21 of the winding roller 17 comes into contact with the wire 5, current is passed through the wire 5 between the two electrodes 21 and 23, and the wire The current-carrying portion of No. 5 will be fused. After this fusing is completed, the winding roller 17 continues to wind up the wire 5. Therefore, each time the electrode 21 of the winding roller 17 comes into contact with the wire 5, the contact energized portion is fused, and the used wire 5 is eventually cut to a certain size. Cut it into pieces.

The cutting dimension of this wire 5 is adjusted by changing the number of electrodes 21 on the winding roller 17. Further, the power supply device 25 may be either an AC power supply or a DC power supply.

FIG. 3 shows another embodiment of the wire cutting device @19, in which a winding roller 17 is made of a conductive material and also serves as an electrode 21. A switching device 27 is connected between the electrodes 21.23 together with a power supply device in order to supply current between the electrodes 21.23 at regular intervals.

In this embodiment, each time the switching element 27 closes, the contact portion of the winding roller 17 with the wire 5 and the electrode 2
A current is passed between the two and the two are blown out. Therefore, the wire V5 is cut off every time the switching element 27 switches. The cutting dimension of the wire 5 is adjusted by changing the switching element of the switching device 27.

FIG. 4 shows still another embodiment of the wire cutting device 19, in which two electrodes 21 are installed separately from the winding roller 17.
．． 23 is provided, and a power supply device 25 is connected between both electrodes 21 and 23. A wire guide 29 is provided to smoothly feed the wire 5 to both electrodes 21,23.

In this embodiment, the winding roller 17 continuously feeds the used wire 5 between the two electrodes 21.23, and the wire 5 is in contact with both the electrodes 21.23 at the same time. A current is passed through it and it is fused.

Therefore, the cutting size of the wire 5 can be adjusted by using both electrodes 21 and 23.
This can be done by changing the distance of 1m.

FIG. 5 shows still another embodiment, in which a power supply ff121.23 is provided adjacent to the downstream side of the winding row 517, and a switching device 27 is connected between it and the power supply device 25. Even in this embodiment, the wire 5 is connected between both electrodes 21 and 23 every time the switching device 27 is switched.
When the current is applied, it will melt. Therefore, each time the switching device 27 switches, the wire 5 is cut by a fixed size.

[Effect of the invention] This invention brings an electrode into contact with a wire that is not used properly,
Electricity is applied between the electrodes at regular intervals and the wire is fused with the current, so it is possible to cut the used wire into pieces of a certain size, unlike the conventional method of cutting the wire with a cutter. It has the advantage of being able to be used for a long time without problems such as wear of the cutting edge.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a wire-cut electrical discharge machine, Fig. 2 is a front view of one embodiment of this invention, Fig. M3 is a front view of another embodiment of this invention, and Fig. 4 is a further embodiment of this invention. FIG. 5 is a front view of still another embodiment of the present invention. 1... Wire cut electrical discharge machine 3... Delivery reel 5... Wire 7...
Pinch roller 9...Electro discharge machining section 11...X
Axis motor 13... Y-axis motor 15... Work table 17... Winding roller 21.23...
・Electrode 25...Power supply device 127
...Switching device Figure 1

Claims (1)

[Claims] A wire cutting device comprising: a winding device for used electric discharge machined wire; an electrode that contacts the wire fed by the winding device; and a power supply device that passes a cutting current to the electrode at regular intervals. .