JPH09262721A - Wire feeding device for wire electric discharge machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and smoothly feed a wire electrode discharged to a lower wire head to a drawing device in a wire feeding device in a wire electric discharge machine. SOLUTION: A hollow hole formed at the center of revolution in the position corresponding to a V-groove 16 in an outer circumferential surface to guide a wire electrode 1, and a suction hole 18 to communicate the hollow hole with the outer circumferential surface are formed on a feed roller 14. An adjustment piece 6 is freely fitted in the hollow hole, and fixed to a forward cover of a housing 13, a notch part 7 to open an area from an inlet position to an outlet position of the feed roller 14 to receive the wire electrode 1 is formed on the adjustment piece 6, and a machining liquid suction and discharge port 19 is formed in the adjustment piece 6 at which the notch part 7 is located. A suction and feed device is provided between the feed roller 14 and a wire pipe guide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire feeding device in a wire electric discharge machine for machining a workpiece by generating an electric discharge phenomenon between a wire electrode and the workpiece.

[0002]

2. Description of the Related Art Generally, a wire electric discharge machine applies an electric charge to a wire electrode and a workpiece, and discharges electric current generated between the two to machine the workpiece into a predetermined machining shape, and its operation is controlled by an NC device. Has been done. As the electric discharge machining progresses, a slit formed by the electric discharge generated between the workpiece and the wire electrode is formed.
The shape programmed in the C device becomes the machining trajectory.
Further, in a wire electric discharge machine equipped with a wire electrode automatic supply device, a wire electrode that penetrates a workpiece and is inserted into a lower wire head is guided by a feed roller incorporated in the lower wire head, Is turned by 90 ° from the vertical direction to the horizontal direction. The wire electrode is fed by the wire electrode automatic feeder, but the tip of the wire electrode reaching the lower wire head is in a free and unstable state.

Wire electrodes of various sizes and wire diameters and materials are used. Usually, in wire electric discharge machines, the wire electrode is brass and the wire diameter is φ0.2. The slit width is the sum of the diameter of the wire electrode used and the discharge gap generated between the workpiece and is, for example, about 0.25 to 0.3 mm.
However, in the wire electric discharge machine, when machining accuracy of 0.25 mm or less is required as the slit width,
Or the minimum corner radius in die processing is 0.12
When a processing accuracy of 5 mm or less is required, a fine wire electrode of φ0.2 or less must be used as the wire electrode.

The fine wire electrode of φ0.2 or less has a weaker stiffness and is in an unstable state as compared with the commonly used wire electrode of φ0.2 size. Therefore,
The feed roller incorporated in the lower wire head often uses pressure fluid in order to stably run the wire electrode in the V groove on the outer peripheral surface thereof.

Conventionally, various types have been developed as a wire supply device in a wire electric discharge machine for supplying a wire electrode to an electric discharge machined portion. For example,
Japanese Unexamined Patent Publication No. 2-19343 discloses a wire electrode winding induction device for a wire cut electric discharge machine. In the wire electrode winding induction device, the wire electrode is pressed against the grooved roller by the pressure flow from the lateral direction, the course of the wire electrode is changed from the longitudinal direction to the lateral direction, and the wire electrode is fed out from the machining area of the wire electric discharge machine. The wire electrode is received and a propulsive force is applied to the wire electrode.

In general, an automatic wire feeding device feeds the wire electrode 1 fed from a source bobbin 60 to an electric discharge machining site A as shown in FIG. It has a wire electrode supply system including 63, a drawing roller 64, a winding roller 65 and the like. Further, in the electric discharge machining part A where the workpiece 80 is electric discharge machined by the wire electrode 1,
The wire electrode 1 has an upper wire head 66 and a lower wire head 6.
7 and are restrained and guided.

By the way, the conventional lower wire head 67 is
For example, the structure shown in FIGS. 11 and 12 is provided. The lower wire head 67 includes a nozzle holder 68 equipped with a nozzle into which the wire electrode 1 is inserted, a die guide holder 69 equipped with a die guide for restraining the wire electrode 1 and preventing displacement of the wire electrode 1, and the wire electrode 1. Power supply holder 70 provided with a power supply for supplying electric power, wire electrode 1
Roller housing 7 having a feed roller 71 for guiding the
2. The bearing case 75 accommodates a ball bearing 74 that rotatably supports the feed roller shaft 73. Further, the lower wire head 67 is provided with water jet nozzles 76 and 77, and the feed roller 71 is rotated by the pressure of the machining fluid jetted from the water jet nozzles 76 and 77 toward the guide groove 79 of the feed roller 71. When receiving the wire electrode 1, the wire electrode 1 is guided by the guide groove 7 of the feed roller 71.
It is pressed against 9. The wire electrode 1 is fed from the lower wire head 67 by the feed of the wire electrode automatic feeder and the rotational force of the feed roller 71. In addition, the feed roller 7
In order to prevent the machining fluid sprayed toward the peripheral surface of the first nozzle 1 from entering the bearing case 75 from the roller housing 72, between the roller housing 72 and the bearing case 75, that is, the bearing case 75 and the feed roller shaft 7.
An oil seal 78 is provided between the oil seals 3 and 3.

[0008]

By the way, in the wire electric discharge machine, an automatic wire electrode supply device has been developed, and an operator can program everything from insertion of the wire electrode to completion of machining as long as the work piece is attached and detached. It's automated to do exactly what you want. However, a diameter smaller than φ0.2 where wire electrodes are normally used, for example φ
When a wire electrode having a diameter of about 0.15 to φ0.1 is used, the wire electrode is easily bent, and the wire electrode easily bends as the feeding amount increases in the wire electrode insertion step, and the operating rate of the wire electrode automatic feeder decreases. In particular, in the vicinity of the feed roller disposed downstream of the lower wire head, the position of the tip of the wire electrode becomes unstable, and the phenomenon that the V groove formed on the outer peripheral surface of the feed roller is not stably fed occurs. . Further, the wire electrode guided in the V groove of the feed roller travels while being wound around the outer peripheral surface of the feed roller in a predetermined angle region, but at the release position where the predetermined angle region ends, the wire electrode is tangential to the outer peripheral surface of the feed roller. When the wire electrode advances in the direction and is released, the wire electrode easily bends, so that a phenomenon occurs in which the wire electrode is not smoothly fed to the wire guide pipe provided in the downstream.

Therefore, in the wire electric discharge machine as described above, since the wire electrode is stably run in the V groove on the outer peripheral surface of the feed roller, the wire electrode is always stabilized in the V groove even if the fluid pressure is increased. If the fluid pressure cannot be increased and the fluid pressure is unnecessarily increased, the fluid will flow into a bearing or the like that holds the feed roller rotatably. Furthermore, the wire electrode fed by the feed roller must be released tangentially from the feed roller at the exit and be delivered smoothly. If the wire electrode is in the release position of the feed roller and there is a problem such as the tip of the wire electrode wobbling, the wire electrode cannot be smoothly drawn out and is deposited at that position, resulting in an unmanned operation of the wire electric discharge machine,
Especially, when a fine wire electrode is used, it becomes a big problem.

Regarding the lower wire head 67, when the wire electrode 1 is fed out, the working liquid is jetted in the advancing direction of the wire electrode 1 toward the guide groove 79 of the feed roller 71, and the feed roller is driven by the pressure of the working liquid. Although the wire electrode 1 was sent out by the working liquid while rotating 71, the wire electrode 1 is sent out through the pipe extending in the horizontal direction, so that it is sufficient to pay out the wire electrode 1, but for example, In the wire feeder of the type using a wire guide pipe extending upward in an inclined state, such as the wire feeder in the wire electric discharge machine disclosed in Japanese Patent Application No. 8-22967 of the applicant, the wire electrode is There is a problem that the guide pipe cannot be reliably supplied.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to reliably feed the wire electrode fed from the lower wire head to a drawing device such as a drawing roller provided outside the processing tank. Even if a wire electrode having a wire electrode size smaller than a general size is used, the wire electrode is surely and stably run in the V groove on the outer peripheral surface of the feed roller to change the direction of the wire electrode to a desired angle. After that, the wire is released in the tangential direction from the V groove to run, and a suction / feed device is provided in the vicinity of the advancing direction of the wire electrode advancing in the tangential direction from the released position on the outer peripheral surface of the feed roller, thereby obstructing the advance of the wire electrode It is possible to discharge the wire electrode outside the processing tank by catching it and sending it to the wire guide pipe on the downstream side. A wire feeder for a wire electric discharge machine, which is suitable for a wire feeder of a machining fluid immersion type in which a wire guide pipe extends a waste wire upward to an upper edge of a machining tank without providing a through hole. That is.

According to the present invention, a wire electrode for electric discharge machining of a workpiece supported between an upper wire head and a lower wire head housed in a machining tank is rotatably supported by a housing supporting the lower wire head. Feed roller, a fluid ejection nozzle for feeding the wire electrode to a downstream flow, and a wire for guiding the drawing device outside the machining tank through a wire guide pipe that is disposed downstream of the feed roller and extends to the outside of the machining tank. A wire feeding device in an electric discharge machine; a hollow hole formed in the feed roller at a position corresponding to a V groove on an outer peripheral surface which guides the wire electrode and at a rotation center, and penetrating from the outer peripheral surface to the hollow hole. A plurality of suction holes are formed; an adjustment piece that is loosely fitted in the hollow hole and fixed to the housing is provided, and the adjustment piece has a front portion. A notch is formed to open the suction hole of a part of the feed roller that receives the wire electrode over a predetermined area, and a machining fluid suction / exhaust port is formed in the adjustment piece where the notch is located. thing;
And a suction-feeding device having a wire electrode passage communicating between the feed roller and the wire guide pipe and arranged between the feed roller and the wire guide pipe. Wire feeder in a machine.

Further, the suction-feeding device is directed toward a suction-feeding main body fixed to the housing, a suction cylinder rotatably arranged in the suction-feeding main body, and an outlet provided in the downstream of the suction cylinder. It is composed of an air nozzle that ejects air.

A spiral groove is formed on the inner peripheral surface of the suction cylinder. Further, the suction cylinder is formed with a passage extending from the inlet to the outlet of the suction delivery device.

Further, a large number of blades are provided in the radial direction on the outer peripheral surface of the suction cylinder in order to rotate the suction cylinder with air.

Further, an air supply path for supplying the air, which rotates the blade of the suction cylinder, to the air nozzle is formed in the suction delivery main body.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a wire feeding device in a wire electric discharge machine according to the present invention will be described below with reference to the drawings. 1 is a schematic explanatory view showing an embodiment of a wire feeding device in a wire electric discharge machine according to the present invention, FIG. 2 is a side view showing the wire feeding device in the wire electric discharge machine of FIG. 1, and FIG. 3 is a feed roller and adjustment. 4 is an explanatory view showing the relationship with the top, FIG. 4 is an explanatory view showing the feed roller, FIG. 5 is a perspective view showing the adjustment top, and FIG. 6 is a suction feed arranged downstream of the feed roller in the wire feeding device of FIG. FIG. 7 is a schematic explanatory view showing the apparatus, FIG. 7 is a reduced sectional view taken along line AA of the suction feeding device of FIG. 6, FIG. 8 is a reduced sectional view taken along line BB of the suction feeding device of FIG. 6, and FIG. It is a contracted sectional view in line CC of the suction delivery device of No. 6.

This wire electric discharge machine is for performing a wire electric discharge machining on a workpiece by a wire electrode 1 into a predetermined machining shape, and an automatic wire feeding device is provided in the main body of the machine constituting the wire electric discharge machine. ing. In this wire electric discharge machine, for example, an upper wire head is attached to a main body of the machine, and a lower arm that hangs down into the machining tank is attached to a holder, a supply pipe, a wire for supplying the wire electrode 1. A device such as a roller for guiding the electrode 1 is provided. The processing tank 2 is installed on a cross slide composed of, for example, an X-axis table and a Y-axis table, and a workpiece is fixed by a clamp in the processing tank 2. The X-axis table slides on the Y-axis table in the X-axis direction by the X-axis motor by the servo function.
The Y-axis table slides on the bed base in the Y-axis direction by a Y-axis motor by a servo function. The machining tank can perform planar movement in the X-axis and Y-axis directions in accordance with the machining shape of the workpiece to be electric discharge machined by the cross slide.

The upper wire head is similar to the conventional one,
A wire outlet, a die guide, a jet nozzle, a power supply, a power supply presser foot, etc. are incorporated. A lower wire head 9 is provided so as to face the upper wire head. A drawing device such as a pair of drawing rollers for drawing the wire electrode to bring the wire electrode 1 into a tensioned state is provided downstream of the lower wire head 9. The drawer device is attached to a support member provided outside the processing tank 2. Further, the lower wire head 9 is provided with a sensor or the like for detecting that the wire electrode 1 is inserted into the lower wire head 9, and the tip of the wire electrode 1 is provided at the start hole of the workpiece, the processing slit, or the lower wire. When it is not inserted in the head 9, a supply failure detection signal is transmitted to the controller. In the wire electric discharge machine, for example, a waste wire hopper is provided adjacent to the machining tank 2, and a machining fluid filtering device is provided adjacent to the bed base. The wire electrode 1 drawn from the drawing device is discharged to the waste wire hopper.

In the wire feeder of the wire electric discharge machine, an upper wire head for guiding the wire electrode 1 to the electric discharge machining site of the workpiece is provided in the head body. The machining tank 2 that contains the machining fluid is attached to an X-axis table that supports a workpiece in the machining fluid. A supporting member such as a lower arm is attached so as to hang from the head body from above the processing tank 2, and a lower arm case, that is, a housing 13 is provided at the tip of the lower arm. A lower wire head 9 that receives the wire electrode 1 on which the workpiece has been subjected to electric discharge machining is supported by the housing 13. The feed roller 14 rotatably supported by the housing 13 redirects and guides the wire electrode 1 fed from the lower wire head 9.

The wire feeding device in this wire electric discharge machine is a wire electrode 1 for electric discharge machining a workpiece positioned between an upper wire head and a lower wire head 9 in a machining fluid contained in a machining tank 2. Is inserted into the feed roller 14 rotatably supported by the housing 13 supporting the lower wire head 9 and the inlet 33 of the wire guide pipe 15, so that the wire electrode 1 is opened inside the housing 13 A wire provided outside the processing tank 2 through an air ejection nozzle 30 as a fluid ejection nozzle for injecting a fluid into the processing tank 2 and a wire guide pipe 15 that extends upward in a slanting state inside the processing tank 2 arranged in the downstream of the feed roller 14. It guides the drawer.

In the wire feeding device of this wire electric discharge machine, a suction feeding device 5 (FIG. 6) is provided between the feeding roller 14 and the wire guide pipe 15. The wire guide pipe 15 has its inlet 33 opened at the outlet 11 of the suction-feeding device 5, and the outlet of the wire guide pipe 15 is opened at the upper edge of the processing tank 2. The wire guide pipe 15 penetrates the inside of the support member from the housing 13, extends obliquely above the upper edge of the machining tank 2 through the machining fluid, and is approximately 30 ° with respect to the horizontal plane of the machining fluid, for example. Is inclined to. The jet nozzle 30 has a housing 13
Since the wire electrode 1 is inserted into the inlet 12 of the suction / feed device 5 that opens inside, the wire electrode 1 is guided by the feed roller 14 and jetted with a fluid such as a powerful working fluid to the wire electrode 1 to change the direction of the wire electrode 1. Then, it is guided and inserted into the suction and delivery device 5. Further, the outlet of the wire guide pipe 15 is provided with a drawing device such as a wire drawing roller for drawing the wire electrode 1 provided in the vicinity thereof.

In the wire feeder of this wire electric discharge machine, the auxiliary air jet nozzle 31 is provided in the suction feeder 5 between the feed roller 14 and the wire guide pipe 15 in the housing 13. This wire feeder is
The end of the wire guide pipe 15 extending to the outside of the processing tank 2 extends to the waste wire hopper in order to dehydrate the working fluid that has risen along with the air in the wire guide pipe 15 and collect it in the working fluid filtering device. . The waste wire hopper is made of a non-conductive material, and is configured so that there is no gap at a position where the end faces are in contact with each other. The waste wire hopper is, for example,
The waste wire hopper is disposed above the working fluid filtering device, and a through hole is formed in the bottom of the waste wire hopper. The working liquid that has risen along with the air in the wire guide pipe 15 drops into the waste wire hopper together with the wire electrode 1 of the waste wire and is accommodated in the waste wire hopper, but the working liquid is formed on the bottom of the waste wire hopper. It is recovered to the processing liquid filtering device through the through hole.

In the wire feeding device of this wire electric discharge machine, in particular, the feed roller 14 has a hollow hole 17 formed at a position corresponding to the V groove 16 on the outer peripheral surface for guiding the wire electrode 1 and at the center of rotation. A large number of suction holes 18 that connect the hollow hole 17 and the outer peripheral surface are formed. Suction hole 18
Are formed at substantially equal intervals in the circumferential direction of the feed roller 14 and extend in the radial direction. Housing 1
A hollow hole 45 that forms a feed roller rotating region is formed in the roller housing 4 that forms part 3. The feed roller 14 is arranged in the hollow hole 45 of the roller housing 4. The feed roller 14 has a support portion 29. The support portion 29 is rotatably supported by the bearing 32 in the hole portion 36 of the bearing case 3 of the housing 13.
A roller housing 4 is fixed to the bearing case 3, and a front cover 39 is attached to the roller housing 4.

Further, in the hollow hole 17 of the feed roller 14,
A portion of the adjustment piece 6 having the cutout portion 7 is arranged and loosely fitted so that the gap formed between the wall surface of the hollow hole 17 and the outer peripheral surface of the adjustment piece 6 is as small as possible. The adjustment piece 6 includes a mounting portion 8, and the mounting portion 8 presses the adjustment piece 6 against a front cover 39 that constitutes the housing 13.
It is fixed so that it can be replaced. Further, a labyrinth seal portion 41 is formed on the opposing surface of the adjustment piece 6 and the front cover 39 so as to have a sealing effect by reducing the gap. Between the hole 36 of the bearing case 3 and the feed roller 14, the feed roller rotating region and the support region are sealed, so that the hole 36 of the bearing case 3 has the seal member 3 therein.
4 are arranged. In order to prevent the working fluid from leaking from the feed roller rotating area to the supporting portion 29 side,
It is supplied to the space 37 between the bearings 32 through the air passage 35. A rear cover 38 is attached to the bearing case 3 to seal the support area.

The adjusting piece 6 is formed with a notch portion 7 which opens over a predetermined angle in the region from the inlet position to the outlet position of the feed roller 14 which receives the wire electrode 1.
The machining fluid suction passage 19 is provided in the adjustment piece 6 in which the notch 7 is located.
Are formed. A machining fluid discharge pipe 40 is connected to the machining fluid suction path 19 of the adjustment piece 6. The suction hole 18 formed in the feed roller 14 has a hollow hole 45 and a hollow hole 17 in the roller housing 4 in a region corresponding to the cutout portion 7.
Can communicate with. Therefore, when the machining liquid existing in the notch 7 is sucked through the machining liquid discharge pipe 40 from the suction device (not shown), the machining liquid existing in the V groove 16 on the outer peripheral surface of the feed roller 14 is sucked through the suction hole 18. It is discharged to the processing liquid discharge pipe 40, whereby the wire electrode 1 running on the outer peripheral surface of the feed roller 14 is V-shaped groove 16.
The wire electrode 1 is deflected along the outer peripheral surface of the feed roller 14, and the wire electrode 1 is released from the feed roller 14 at the position where the cutout portion 7 ends, and the outlet 28
Is guided to the suction delivery device 5.

In the wire feeder of this wire electric discharge machine, the cutout angle of the cutout portion 7 of the adjustment piece 6 and the mounting position of the adjustment piece 6 are the size and type of the wire electrode 1 to be used, and the amount of the working fluid. It is properly set in consideration of the above. In addition, the action starting point of the suction force due to the space formed by the cutout portion 7 of the adjustment piece 6 is located slightly before the position where the wire electrode 1 starts to be attracted to the feed roller 14. Can be reliably and satisfactorily adsorbed to the V groove 16. Further, the end point where the space portion formed by the cutout portion 7 is formed is a position slightly before the position of the outlet 28 where the wire electrode 1 is released from the feed roller 14, and the wire electrode 1 is formed into the V groove. 16 can be released reliably and satisfactorily.

In the wire feeder of this wire electric discharge machine, the feed roller 14 and the wire guide pipe 1
5 is provided with a suction-feeding device 5 that communicates with the suction-feeding device 5. The suction-feeding device 5 has an inlet 12 facing the outlet 28 formed in the roller housing 4 and the wire guide pipe 1.
5, the outlet 11 facing the inlet 33 is formed, and the inlet 1
2 and the outlet 11 to connect the wire electrode passages 46, 20,
50 and 51 are formed. Suction delivery device 5
Is mainly an intermediate member 43 (FIG. 2) in the housing 13.
To the suction feed-out main body 10 fixed via the above, the suction cylinder 23 rotatably supported by the bearing 27 in the suction feed-out main body 10, the intermediate member 21 and the intermediate member 21 fixed adjacent to the suction feed-out main body 10. An end cover 22 fixed to the suction delivery main body 10 arranged adjacently, and an annular air nozzle 31 formed in the end cover 22 at the boundary region between the intermediate member 21 and the end cover 22 and ejecting air toward the outlet 11. It consists of Further, a reinforcing ring 49 is provided on the outer periphery of the suction cylinder 23,
The bearing 27 is positioned between the outer peripheral surface of the reinforcing ring 49 and the cylinder 48 of the suction delivery main body 10.

The suction and delivery device 5 is attached to the end surface of the housing 13 via an intermediate member 43. The intermediate member 43 is attached to the housing 13 by the housing 1
Outlet 28 formed in the roller housing 4 at 3
The wire electrode passages 44 formed in the intermediate member 43 are set to communicate with each other. A wire electrode passage 46 that communicates with the wire electrode passage 44 of the intermediate member 43 is formed in the suction delivery main body 10. Suction delivery body 1
0 is a cylinder 4 that rotatably supports the suction cylinder 23.
8 and an air supply path 47 for injecting air into the cylinder 48
Are formed.

A wire electrode passage 20 extending in the axial direction of the center of rotation is formed in the suction cylinder 23, and the spiral groove 2 extending along the streamline through which the working liquid flows is formed on the wall surface of the wire electrode passage 20.
4 are formed. Further, the suction cylinder 23 has
So that the suction cylinder 23 rotates by blowing air,
A large number of blades 25 are provided in the radial direction. The formation direction of the air supply passage 47 formed in the suction delivery main body 10 is set so that the air is jetted at a right angle to the surface of the blade 25. In addition, the suction delivery body 10
An air supply passage 26 that opens to the cylinder 48 is formed in the cylinder 48 so as to supply the air obtained by rotating the blade 25 of the suction cylinder 23 to the annular air nozzle 31. Further, in the suction cylinder 23, the wire electrode passage 2 whose passage cross section is expanded from the suction port 12 side of the suction delivery device 5 toward the outlet 11 side.
0 is formed. Therefore, when the suction cylinder 23 rotates, a suction force is generated in the wire electrode passage 20 of the suction cylinder 23 toward the outlet.

In the intermediate member 21, a wire electrode passage 50 communicating with the wire electrode passage 20 formed in the suction cylinder 23 is formed. On the outer peripheral surface of the intermediate member 21, there is formed a convex tapered surface 52 whose diameter is reduced toward the exit direction. The intermediate member 21 is provided with an air supply passage 54 that communicates with the air supply passage 26 formed in the suction delivery main body 10. On the opposing surface of the suction-feeding main body 10 and the intermediate member 21, a seal portion 5 is provided in an annular groove formed in the intermediate member 21.
7 are arranged.

The intermediate member 2 is attached to the end cover 22.
A wire electrode passage 51 communicating with the wire electrode passage 50 formed in No. 1 is formed. In the end cover 22,
A concave tapered surface 53 into which the convex tapered surface 52 of the intermediate member 21 can enter is formed at the center of the shaft on the side of the intermediate member 21. An annular groove 55 that communicates with the air supply passage 54 of the intermediate member 21 is formed in the end cover 22. Slits 56 are formed in the end cover 22 at a plurality of positions of the annular groove 55. An annular air nozzle 31 communicating with the slit 56 of the end cover 22 is formed between the convex tapered surface 52 of the intermediate member 21 and the concave tapered surface 53 of the end cover 22. Intermediate member 21 and end cover 22
A seal portion 58 is arranged in the annular groove formed in the end cover 22 on the surface facing the. Further, the wire guide pipe 15 is attached to the end cover 22 so as to communicate with the wire electrode passage 51 of the end cover 22 and the inlet 33 of the wire guide pipe 15.

In the wire feeder of this wire electric discharge machine, the bearing case 3 and the roller housing 4 are
Can be made of, for example, a metal having anticorrosive properties. The feed roller 14 can be made of, for example, ceramics. The adjustment piece 6 and the front cover 39 can be made of, for example, a synthetic resin. Further, the suction-feeding main body 10, the intermediate member 21, and the end cover 22 which constitute the suction-feeding device 5
Can be made of, for example, a synthetic resin. The suction cylinder 23 is
For example, it can be manufactured by processing with an aluminum material or molded with a synthetic resin.

Next, the operation of the wire feeding device in this wire electric discharge machine will be described. The wire electric discharge machine is driven, the supply of the machining liquid is started, the wire electrode 1 is inserted from above the lower wire head 9, and the feed roller 14 starts rotating. The machining liquid is sucked through the machining liquid suction passage 19 and the machining liquid discharge pipe 40 from the space formed by the cutout portion 7 of the adjusting piece 6 and the hollow hole 17 of the feed roller 14. When the working fluid is sucked, the feed roller 1
The machining liquid is sucked from the outer peripheral surface of the feed roller 14 through the suction holes 18 of No. 4, and the wire electrode 1 is attracted to the V groove 16 of the feed roller 14 and is changed in direction according to the rotation of the feed roller 14. The feed roller 14 continues to rotate, but unless the position of the cutout portion 7 formed on the adjustment piece 6 is moved and adjusted, the suction start position and the release position of the wire electrode 1 are not changed, and the feed roller 14 is always at a predetermined angle. The wire electrode 1 is adsorbed in the area.

The adjusting piece 6 is constructed so that it can be easily exchanged from the feed roller 14 and the position of the notch 7 of the adjusting piece 6 can be changed appropriately, and the working fluid is sucked from the outside of the feed roller 14. The suction force is sucked into the notch 7 through the hole 18, and the suction force is adjusted in consideration of the wire electrode 1 and the working fluid by the suction force sucked through the machining fluid suction passage 19 and the machining fluid discharge pipe 40. That is, if the suction force of the working liquid is properly adjusted, the wire electrode 1 attracted to the V groove 16 on the outer peripheral surface of the feed roller 14 is favorably attracted to the V groove 16 in the area in contact with the feed roller 14, At a position slightly before reaching the outlet 28 formed in the roller housing 4, the notch 7 of the adjusting piece 6 reaches the end, and the wire electrode 1 releases the attraction force to the V groove 16 of the feed roller 14. .

Next, the wire electrode 1 is fed to the feed roller 14
And is sucked into the suction port 12 by the function of the suction / feeding device 5, and the working liquid is flowed together with the wire electrode 1 in the same direction. In the suction-feeding device 5, the suction cylinder 23 is rotated by the air sprayed on the blade 25, and a spiral groove 24 is formed on the inner peripheral surface of the suction cylinder 23. Therefore, the spiral groove 24 rotates the working liquid in accordance with the rotation of the suction cylinder 23, and the suction cylinder 23 has a small passage cross-sectional area on the inlet side.
Since the passage cross-sectional area is formed large on the outlet side, the rotation speed of the suction cylinder 23 is constant, but the peripheral speeds on the inlet side and the outlet side gradually increase from the inlet side to the outlet side.
As a result, the swirling peripheral velocity of the machining fluid also gradually increases from the inlet side toward the outlet side, a pumping action of the machining fluid occurs, and the wire electrode 1 is sucked from the inlet side to the outlet side.

The air that has rotated the suction cylinder 23 is supplied from the cylinder 48 to the slit 56 through the air supply passage 26 and the air supply passage 54, and then the air nozzle 31.
From the wire electrode passage 51 and the outlet 11. As described above, the wire electrode 1 smoothly moves to the suction tube 2
3 is sucked and proceeds to the outlet 11. However, since air is ejected from the annular air nozzle 31 in the vicinity of the outlet 11, the wire electrode 1 causes the wire electrode 1 to pass through the wire electrode passage 5 by the air ejection force.
It is surely and smoothly injected into the wire guide pipe 15 from 0, 51 and the outlet 11.

As described above, the wire electrode 1 is delivered by the suction delivery device 5, and the wire guide pipe 1
It will be sent to 5. Then, although not shown, the wire electrode 1 is removed from the wire guide pipe 15 by
It is drawn out by a drawing device provided outside the processing tank 2 and discharged to a waste wire hopper provided adjacent to the processing tank 2. After that, during operation of the wire electric discharge machine, the wire electrode is continuously withdrawn by the withdrawing device, so that the suction action of the machining liquid in the adjustment piece and the air action of the suction delivery device may be disabled, but in some cases, Needless to say, the suction action of the adjustment piece and the air action of the suction feed device may be slightly functioned.

[0039]

Since the wire feeding device in the wire electric discharge machine according to the present invention is constructed as described above, the wire electrode discharged by electric discharge machining of the workpiece is inserted substantially vertically into the lower wire head. , Reaches the feed roller, where the wire electrode is driven by the hydraulic pressure of the working liquid acting from the outside of the feed roller and the suction force generated through the suction hole from the notch of the adjusting piece arranged in the hollow hole of the feed roller. The wire electrode is attracted to the V groove of the feed roller and travels with the rotation of the feed roller, is guided by the feed roller to change direction, and the wire electrode is released from the hydraulic pressure and suction force of the working fluid and sent to the exit position. Therefore, since the suction feed device is provided at the release position of the wire electrode of the feed roller, the wire electrode is sucked by the suction cylinder of the suction feed device, and then sent to the wire guide pipe to the air jet output. Since a drawing device such as a drawing roller is provided downstream of the wire guide pipe, the wire electrode coming out of the wire guide pipe is drawn by the drawing device and discharged to the waste wire hopper. After that, since the wire electrode is continuously pulled out by the pulling device, the suction action of the machining liquid in the adjustment piece and the air action of the suction sending device may be disabled, but in some cases, the suction action and the suction sending in the adjustment piece may be canceled. Of course, the air action of the device may be slightly functioning.

Therefore, in the wire feeding device of this wire electric discharge machine, the wire electrode fed from the lower wire head can be reliably and smoothly fed to the pulling device such as the pulling roller provided outside the machining tank. Even if a wire electrode whose size is smaller than the general size is used, the wire electrode is surely and stably run in the V groove on the outer peripheral surface of the feed roller, and after changing the direction of the wire electrode to a desired angle, the wire electrode is removed from the V groove. It is possible to release the vehicle in the tangential direction for traveling, and to advance in the tangential direction from the released position on the outer peripheral surface of the feed roller. Next, the wire electrode is provided with a suction-feeding device in the vicinity of the feed roller in the moving direction thereof, so that the wire guide pipe on the downstream side can be reliably and smoothly provided by the function of the suction cylinder without disturbing the movement of the wire electrode. The wire electrode can be discharged to the outside of the processing tank. Further, in the wire electric discharge machine, the wire guide pipe extends the waste wire to the upper edge of the machining tank in a slanting state so as to be inclined upward without providing a through hole for feeding the wire electrode in the machining tank. It is preferable to be applied to a wire feeding device of a type.

By using the wire feeding device in this wire electric discharge machine, it is not necessary to form an elongated hole for penetrating the lower arm supporting the lower wire head in the rear side wall of the machining tank, which is different from the conventional one. It is no longer necessary to take the wire electrode out of the long hole formed on the rear side wall of the processing tank, and the structure of the processing tank can be simply configured. Processing in the processing tank by providing a waste wire discharge passage in the conventional processing tank No need for a liquid seal structure,
The sliding resistance can be reduced with respect to the movement of the processing tank, and the processing accuracy can be improved. In addition, if the suction and delivery device is provided with the air ejection nozzle, the tip of the wire electrode can be reliably guided into the wire guide pipe by the ejected air.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of a wire feeding device in a wire electric discharge machine according to the present invention.

FIG. 2 is a side view showing a wire feeding device in the wire electric discharge machine of FIG.

FIG. 3 is an explanatory diagram showing a relationship between a feed roller and an adjustment piece.

FIG. 4 is an explanatory diagram showing a feed roller.

FIG. 5 is a perspective view showing an adjustment piece.

6 is a schematic explanatory view showing a suction and delivery device arranged downstream of the feed roller of FIG. 1. FIG.

7 is a reduced cross-sectional view showing a suction delivery main body and a suction tube taken along line AA of the suction delivery apparatus of FIG.

FIG. 8 is a reduced plan view showing an intermediate member taken along line BB of the suction and delivery device of FIG.

9 is a reduced plan view showing an end cover taken along line C-C of the suction and delivery device of FIG.

FIG. 10 is a schematic front view showing a wire electrode supply system in the wire electric discharge machine.

FIG. 11 is a front view showing a conventional lower wire head.

12 is a partial cross-sectional view of the lower wire head of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire electrode 2 Processing tank 3 Bearing case 4 Roller housing 5 Suction delivery device 6 Adjustment piece 7 Notch 9 Lower wire head 10 Suction delivery main body 11 Outlet 12 Inlet 13 Housing 14 Feed roller 15 Wire guide pipe 16 V groove 17 Hollow hole 18 suction holes 20, 46, 50, 51 wire electrode passages 23 suction cylinders 24 spiral grooves 25 blades 26 air supply passages 31 air nozzles

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Koporu 3-3-1 East, Kogacho Station, Kasuya-gun, Fukuoka Seibu Electric Co., Ltd.

Claims (6)

[Claims] 1. A wire electrode for electric discharge machining of a workpiece positioned between an upper wire head and a lower wire head housed in a machining tank is rotatably supported by a housing supporting the lower wire head. Wire discharge for guiding the wire electrode to the drawing device outside the processing tank through a feed roller, a fluid jet nozzle for sending the wire electrode to the downstream side, and a wire guide pipe arranged outside the processing tank arranged in the downstream side of the feed roller. A wire feeding device in a processing machine; a hollow hole formed in the feed roller at a position corresponding to a V groove on an outer peripheral surface that guides the wire electrode and at a rotation center, and a plurality of holes penetrating from the outer peripheral surface to the hollow hole. A suction hole is formed in the hollow hole; the adjustment piece is loosely fitted in the hollow hole and fixed to the housing, and the adjustment piece has the wire. A cutout portion that opens the suction hole of a part of the feed roller that receives the electrode over a predetermined region is formed, and a machining fluid suction / exhaust port is formed in the adjustment piece in which the cutout portion is located. And a suction-discharging device having a wire electrode passage communicating between the feed roller and the wire guide pipe and arranged between the feed roller and the wire guide pipe. Wire feeder for processing machines. 2. The suction and delivery device faces a suction and delivery body fixed to the housing, a suction barrel rotatably disposed in the suction and delivery body, and an outlet provided in the downstream of the suction barrel. The wire feeding device in the wire electric discharge machine according to claim 1, wherein the wire feeding device is configured by an air nozzle that ejects air. 3. The wire feeding device for a wire electric discharge machine according to claim 2, wherein a spiral groove is formed on the inner peripheral surface of the suction cylinder. 4. The wire feeding device in the wire electric discharge machine according to claim 2, wherein the suction cylinder is formed with a passage extending from an inlet of the suction feeding device toward an outlet thereof. 5. The wire electric discharge machine according to claim 2, wherein a plurality of blades are provided on an outer peripheral surface of the suction cylinder in a radial direction in order to rotate the suction cylinder with air. Wire feeder in machine. 6. The air supply passage according to claim 2, wherein an air supply path is formed in the suction delivery main body to supply the air that rotates the blade of the suction cylinder to the air nozzle. Wire feeder for wire electric discharge machine.