JP2002307240A - Wire electric discharge machine capable of simultaneously machining a plurality of machined parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve machining efficiency and simply constitute a device itself by allowing a wire electric discharge machine to simultaneously machine a plurality of machined parts of workpieces. SOLUTION: In this wire electric discharge machine, a plurality of machined parts of the workpieces 2A, 2B are positioned and set between a pair of upper head parts 5A, 5B mounted to a Z-axis movable body 34, and a pair of lower head parts 6A, 6B mounted to a lower arm 31, and one wire electrode 1 delivered from a wire electrode supply system 9 is inserted through start holes 3 or machining slits 4 of a plurality of machined parts of the workpieces 2A, 2B respectively to simultaneously machine a plurality of machined parts. A plurality of machined parts are machined parts in a region predetermined at a plurality of parts of one workpiece 2A or 2B, or machined parts in the respective regions predetermined at one part of each of a plurality of workpieces 2A, 2B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine capable of simultaneous machining of a plurality of machining portions for performing a wire electric discharge machining of a workpiece fixed to a table by a wire electrode fed through a wire electrode supply system by discharge energy. About.

[0002]

2. Description of the Related Art A conventional wire electric discharge machine basically performs machining on one machining portion of a workpiece with one wire electrode, and machining a plurality of workpieces or a plurality of locations on the workpiece. To do so, it is generally necessary to use not only a plurality of wire electrodes corresponding thereto but also a plurality of processing circuits (for example, Japanese Patent Application Laid-Open No. H6-226538,
See JP-A-49-93092).

As shown in FIGS. 4, 5 and 6, a wire electric discharge machine generates an electric discharge phenomenon between a wire electrode 1 and a workpiece 2 to machine a hard metal or hardened steel. This is a machine tool for cutting out the object 2, and a work tank 26 is provided on a work table 29 provided on a base 28. In the processing tank 26, the lower head portion 6 attached to the lower arm 31 and the workpiece 2 attached to the work table 29 by a clamp or the like are installed. Also, a Z-axis driving device, a UV sliding vertically with respect to the Z-axis base 7.
The upper arm 33 attached to the Z-axis movable body (that is, Z quill) 34 provided with the axis driving device and the like is provided with the upper head section 5 facing the lower head section 6. When starting the electric discharge machining on the workpiece 2, the wire electrode 1 is inserted in advance into a start hole 3 or a machining slit 4 drilled in the workpiece 2. The wire electrode 1 is always supplied,
When a gap voltage is applied between the wire electrode 1 and the workpiece 2 to cause discharge, the workpiece 2 is subjected to electrical discharge machining into a predetermined machining shape by discharge energy. The wire electric discharge machining of the workpiece 2 is controlled by a controller provided in a power supply device 30 of the NC device, and a continuous machining slit 4 is formed in the workpiece 2 according to a shape programmed in the controller of the NC device. You.

In recent years, an automatic wire electrode supply device has been developed for a wire electric discharge machine, and when an operator detaches and attaches a workpiece 2, work from insertion of the wire electrode 1 to completion of machining of the workpiece 2 is performed by a controller. It is automated to be accomplished according to programming. When the processing of the workpiece 2 is completed and the processing of another workpiece 2 is started, and when the wire electrode 1 is disconnected during the electric discharge machining of the workpiece 2, the tip of the wire electrode 1 is cut and removed. The wire electrode 1 is set by inserting the newly formed tip into the start hole 3 or the processing slit 4 of the workpiece 2. As part of the automation of the electric discharge machining operation, the mounting operation of the wire electrode 1 from sending out the wire electrode 1 to cutting the wire electrode 1 and reinserting the wire electrode 1 into the machining slit 4 is automated.

[0005] FIG. 4 shows an automatic wire feeder for passing a wire electrode 1 that has been annealed and straightened straight through a start hole 3 or a machining slit 4 formed in advance in a workpiece 2. As shown in FIGS. 5 and 6, the automatic wire feeder supplies various kinds of direction change to supply the wire electrode 1 fed from the source bobbin 11 attached to the source bobbin shaft 25 to the machining slit 4 or the start hole 3. A wire electrode supply system 9 including a guide roller 12, a brake pulley 13, a tension roller 10, a guide roller 15 for changing the direction, a pull-out roller 22, and the like. In the wire electrode supply system 9, a felt pad 16 is disposed upstream of the brake pulley 13, and a felt brake 17 and a pulley opening / closing lever 18 are provided for the brake pulley 13. Further, a tension roller 10 around which the wire electrode 1 is wound is disposed downstream of the brake pulley 13. Further, in the wire electrode supply system 9, a disconnection detection sensor 14 for detecting either a supply state or a disconnection state of the wire electrode 1 is provided downstream of the tension roller 10.

[0006] From the source bobbin 11 to the wire electrode supply system 9
Is passed through the annealing roller 19 and the common roller 20, and a current is applied to the wire electrode 1 between the annealing roller 19 and the common roller 20 to anneal the wire electrode 1 and the habit of the wire electrode 1. To make it straight. The wire electrode 1 that hangs straight
The deformed portion at the tip is cut using a cutter, and the waste wire clamp is activated to be discarded to the waste wire hopper 24. The wire electrode 1 having a straightened tip is a common roller 2
From 0, it passes through a power supply or the like and is sent to the upper head portion 5 attached to the Z-axis movable body 34. Then, the start hole 3 or the processing slit formed in the workpiece 2 disposed in the processing tank 26 is formed. 4 is drawn out from the lower head part 6 disposed in the processing tank 26 attached to the column 8 through the wire guiding part 21, the discharge roller for discharging the used wire electrode 1, the discharge pipe, and the like. 22 and is discharged from a discharge wire guide 23 to a discharge wire hopper 27.
Is discharged to

The wire electrode 1 is guided by an upper head section 5 and a lower head section 6, and is supplied to the workpiece so that the lateral deflection between the upper head section 5 and the lower head section 6 is restricted. 2 can be run accurately. The lower head portion 6 is supported by the tip of a lower arm 31 attached to the column 8 so as to hang down from above the processing tank 26, and includes a direction change roller and the like inside. A drawer such as a pair of draw-out rollers, that is, draw-out rollers 22 that draws out the wire electrode 1 through the guide pipe 32 and tensions the wire electrode 1 is attached to the outside of the processing tank 26 downstream of the lower head portion 6. I have. Wire electrode 1 straightened by annealing
Is inserted into the start hole 3 or the machining slit 4 of the workpiece 2 from its tip (for example, see Japanese Patent Laid-Open No. 2-145).
No. 215).

The workpiece 2 is fixed to the processing tank 26 by a suitable clamping means or supporting means while being set between the upper head section 5 and the lower head section 6 opposed to each other. The electric discharge machining of the workpiece 2 is performed in a state of being immersed in the machining fluid filled in the machining tank 26, or by preventing the occurrence of aerial discharge by supplying the machining fluid as a water flow to the electric discharge machining portion. Have been. The processing tank 26 is driven in accordance with the processing shape of the workpiece 2 in a plane defined by the X-axis and the Y-axis, for example, by a cross slide composed of an X-axis table and a Y-axis table.
The Y-axis table is driven in the Y-axis direction by a Y-axis servomotor on a bed base, and is provided with a processing tank.
The axis table is driven in the X-axis direction by an X-axis servomotor on the Y-axis table.

[0009]

However, in the conventional wire electric discharge machine, a single wire electrode is used to perform machining on one machining portion of a workpiece, and the machining efficiency of the workpiece is improved. It is difficult. Therefore, as described above, in the wire electric discharge machine, 1
Use multiple wire electrodes instead of one wire electrode,
A plurality of workpieces are machined using a number of machining circuits corresponding to a plurality of wire electrodes. However, if a plurality of wire electrodes and machining circuits are used, the apparatus itself becomes large, and the manufacturing cost increases. Will cause it to go up.
Therefore, it is conceivable to improve machining efficiency by simultaneously machining a plurality of machining portions on a workpiece with one wire electrode and one machining circuit. However, if the technical idea is achieved, There was an issue of how we could do it.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is possible to connect one processed part of a plurality of workpieces or a plurality of processed parts of a workpiece to one wire electrode. By devising the traveling path of the, it is possible to process simultaneously with one wire electrode and the corresponding processing circuit, making the device itself compact and simple, reducing the manufacturing cost and improving the processing efficiency. An object of the present invention is to provide a wire electric discharge machine capable of simultaneously processing a plurality of processing portions that can be raised.

According to the present invention, a discharge is generated by applying a voltage between the wire electrode and the workpiece to a workpiece fixed to a work table by a wire electrode fed through a wire electrode supply system. In a wire electric discharge machine for machining by energy, a plurality of machining portions of the workpiece are respectively positioned between a pair of upper head portions attached to a Z-axis movable body and a pair of lower head portions attached to a lower arm. Setting, and inserting the one wire electrode fed from the wire electrode supply system into a start hole or a processing slit of each of the plurality of processing portions of the workpiece to simultaneously process the plurality of processing portions. And a wire electric discharge machine capable of simultaneously processing a plurality of processing portions.

In this wire electric discharge machine, the plurality of machining portions of the workpiece may be provided at predetermined locations at a plurality of locations of one workpiece or at one location of the plurality of workpieces. It is a processing part of each determined area.

In this wire electric discharge machine, the pair of upper heads are mounted on an upper head face plate fixed to a lower portion of the Z-axis movable body provided on the Z-axis base so as to be vertically movable, Further, the pair of lower heads are separately mounted on a lower head face plate fixed to the distal end of the lower arm corresponding to the pair of upper heads, respectively.

[0014] The plurality of processing portions of the workpiece are respectively provided between one upper head portion and one lower head portion, and between the other upper head portion and the other lower head portion. is set up.

The one wire electrode fed from the wire electrode supply system includes one of the upper head portions,
The workpiece is sequentially inserted into one of the processing portions, the one lower head portion, the other lower head portion, the other processing portion of the workpiece, and the other upper head portion.

The wire electrode supply system includes a source bobbin wound around the wire electrode, a brake pulley for applying a brake to the wire electrode, a tension roller for applying tension to the wire electrode, and the wire electrode to one of the lower heads. A first guide roller attached to the Z-axis base for guiding, a pair of direction change rollers provided on the lower head for guiding the wire electrode sent from the one lower head to the other lower head; A second guide roller provided on the Z-axis base for guiding the wire electrode sent from the other upper head portion in the direction of the Z-axis base, and a wire electrode passing through the second guide roller. It has a drawer roller that draws in and discharges it to the waste wire hopper.

[0017] The plurality of workpieces are respectively fixed to a plurality of clamps fixed to the work table.

This wire electric discharge machine, as described above,
One wire electrode is sequentially inserted into the start hole or the processing slit of each processing part of a plurality of workpieces or a plurality of processing parts of one workpiece, and a gap is formed between the wire electrode and the plurality of processing parts. It is configured so that a voltage can be applied and a plurality of machining parts can be subjected to electric discharge machining at the same time. Also,
In the conventional wire electric discharge machine, the waste wire electrode was discharged through the lower arm attached to the machining tank, but in the wire electric discharge machine of the present invention, the waste wire electrode is guided to the upper portion of the Z-axis base, and from there to the waste wire hopper. Since the discharge is performed, there is no need to consider the leakage of the processing liquid from the processing tank, and the discharge structure of the waste wire electrode can be extremely simplified.
In addition, since a single wire electrode can simultaneously process a plurality of processing portions of a workpiece, similar to conventional multi-machining, the processing efficiency per unit time can be increased and productivity can be increased. The wire electrode supply system can also be simplified, and the apparatus itself can be configured more compactly than conventional multi-machining.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wire electric discharge machine according to the present invention capable of simultaneously machining a plurality of machining portions will be described below with reference to the drawings. One embodiment of a wire electric discharge machine according to the present invention will be described with reference to FIGS. 1, 2 and 3. FIG.

This wire electric discharge machine capable of simultaneous machining of a plurality of machining portions is provided with an upper head portion 5 and a lower head portion 6 in FIG. 4 as compared with the wire electric discharge machine shown in FIGS. On the other hand, the upper head portions 5A and 5B and the lower head portions 6A and 6B are provided in a pair, and the waste wire electrode 1 is pulled out to discharge the waste wire electrode 1 which has been consumed. The difference is that the discharge path does not need to be through the lower arm, whereas the discharge path is through the lower arm 31 penetrating through the processing tank 26. In this embodiment, the same components as those of the wire electric discharge machine shown in FIGS. 4 to 6 and those having the same functions are designated by the same reference numerals. With weight The description thereof will be omitted.

In this wire electric discharge machine, since the wire electrode 1 is not consumed for the machining portion to be machined first, a predetermined machining locus with a predetermined accuracy can be expected. Processing for the processing part is performed by wire electrode 1
However, high precision machining trajectory cannot be expected because of the progress of wear. However, if the required accuracy of the workpieces 2A and 2B is not high and rough work is required, the machining efficiency can be greatly increased. is there. Further, when processing one workpiece 2A or 2B, it is a matter of course that the processing can be advanced by setting only one workpiece.

In this wire electric discharge machine, the Z-axis base 7
Has a Z-axis movable body (Z quill) 3 slidable in the Z-axis direction.
4 is attached. An upper head face plate 35 is fixed below the Z-axis movable body 34. Upper head portions 5A and 5B are attached to both sides of the upper head face plate 35.
Further, a lower head face plate 36, which is located in the processing tank 26 and is opposed to the upper head face plate 35, is attached to the tip of the lower arm 31. On the lower head face plate 36, lower head portions 6A and 6B positioned so as to face the upper head portions 5A and 5B, respectively, are attached.

The upper head portions 5A and 5B are formed with insertion holes through which the wire electrodes 1 penetrate the center in the vertical direction, and a die guide is attached to the tip. A wire guide for guiding the wire electrode 1 is provided at the tip of the die guide. The distal end opening of the wire guide may be formed in a tapered shape, or may be formed straight, as in the conventional case. The workpieces 2A and 2B are set and fixed by at least a pair of clamps 44 provided on the table 29. The workpieces 2A and 2B are formed with a start hole 3 or a processing slit 4 which is a processing path through which the wire electrode 1 is to be inserted. The distal end of the wire electrode 1 is inserted while the head nozzles and the workpieces 2A and 2B are as close as possible.

In this wire electric discharge machine, upper heads 5A and 5B are attached to both sides of an upper head face plate 35 fixed to a lower end of a Z-axis movable body 34, respectively.
Lower heads 6A and 6B are attached to both sides of a lower head face plate 36 fixed to the distal end of the lower arm 31 so as to correspond to the upper heads 5A and 5B, respectively. The workpiece 2A is positioned between the upper electrode 5B and the lower head 6B, and the workpiece 2B is positioned between the upper head 5B and the lower head 6B.
One wire electrode 1 fed from the workpiece 2A, 2A
B are inserted into the start holes 3 or the processing slits 4 of the plurality of processing parts, respectively, and through the processing circuit which is energized by a command of the controller, the inter-electrode voltage is applied between the workpiece 2A and the workpiece 2B and the wire electrode 1 respectively. Is applied to generate a discharge, and a plurality of machining parts are simultaneously subjected to the electric discharge machining by their discharge energy.

In this embodiment, although FIG. 1 shows machining of a plurality of workpieces 2A and 2B for predetermined machining portions, a plurality of locations are determined in advance for one workpiece. It is needless to say that the present invention can be applied to processing of a processed portion in a region where the image has been cut. For example, even when machining a plurality of machining portions of one workpiece, the machining circuit can be configured as a circuit that performs electric discharge dispersion, and does not cause a problem in electric discharge. Although only two locations are shown in the figure, if the wear is not so large due to the characteristics of the wire electrode 1 used, such as the wire diameter, the number of processed parts can be further increased.

In this wire electric discharge machine, a pair of upper head portions 5A and 5B are fixed to a lower portion of a Z-axis movable body 34 provided on a Z-axis base 7 so as to be vertically movable.
5 is attached at a predetermined interval, and a pair of lower heads 6A and 6B are attached to the distal end of the lower arm 31 corresponding to the pair of upper heads 5A and 5B, respectively. Similarly, the lower head face plate 36 is attached to the fixed lower head face plate 36 at a predetermined interval.

A plurality of (a pair in FIG. 1) workpieces 2A, 2
B is between one upper head portion 5A and one lower head portion 6A, and between the other upper head portion 5B and the other lower head portion 6A.
B. Workpiece 2A, 2B
Is a pair of clamps 4 fixed to the work table 29.
4 respectively. Therefore, one wire electrode 1 fed from the wire electrode supply system 9 has one upper head portion 5A, the start hole 3 or the processing slit 4 of the workpiece 2A, one lower head portion 6A, and the other lower head portion. The part 6B, the start hole 3 of the workpiece 2B or the processing slit 4, and then the other upper head part 5B are sequentially inserted.

The wire electrode supply system 9 mainly includes a source bobbin 11 on which the wire electrode 1 is wound up, a brake pulley 13 for applying a brake to the wire electrode 1, and a stopper for preventing the wire electrode 1 from coming off the brake pulley 13. A spring 45, a tension roller 10 for applying tension to the wire electrode 1, a guide roller 38 (first guide roller) provided on an upper head face plate 35 for guiding the wire electrode 1 to one lower head portion 6A, and one lower head portion 6B
The wire electrode 1 sent from the other upper head portion 5B
A pair of direction change rollers 39 and 40 provided on the lower head face plate 36 for guiding the wire electrode 1 and a guide roller 41 (second guide roller) for guiding the wire electrode 1 sent from the other upper head portion 5B toward the support column 37. And a drawer roller 22 for drawing the wire electrode 1 passing through the guide roller 41 and discharging the wire electrode 1 to the waste wire hopper 27.

The wire electric discharge machine is provided with a machining fluid filtering device 43 for filtering the machining fluid. The upper head portions 5A and 5B and the lower head portions 6A and 6B are provided with machining liquid jet nozzles, respectively, for preventing occurrence of aerial discharge during electric discharge machining of the workpieces 2A and 2B by the wire electrode 1. In addition, machining chips generated during machining of the workpieces 2A and 2B are eliminated by the jet flow jetted from the machining liquid jet nozzle, so that the wire electrode 1 is not disconnected.

[0030]

Since the wire electric discharge machine is configured as described above, each machining part of a plurality of workpieces or a plurality of machining parts of one workpiece is connected to one wire electrode. The machining circuit makes it possible to perform electrical discharge machining at the same time, improving machining efficiency per unit time and increasing productivity, and reducing the consumption of wire electrodes compared to multi-machining using multiple wire electrodes. As a result, the manufacturing cost can be reduced, and the wire electrode supply system for a single wire electrode can be simplified, so that the apparatus itself can be made compact and simple. In addition, this wire electric discharge machine does not always have to machine two machining parts, and in some cases, it can also machine only one machining part. The workpiece may be processed as usual by inserting the wire electrode into one start hole or a processing slit formed in the processed part of the workpiece.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a wire electric discharge machine capable of simultaneously processing a plurality of processing portions according to the present invention.

FIG. 2 is a side view of the wire electric discharge machine shown in FIG.

FIG. 3 is an enlarged front view showing a wire electrode supply system in the wire electric discharge machine of FIG.

FIG. 4 is a perspective view showing a conventional wire electric discharge machine.

FIG. 5 is a front view of the wire electric discharge machine shown in FIG.

FIG. 6 is an enlarged front view showing a wire electrode supply system in the wire electric discharge machine of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire electrode 2A, 2B Workpiece 3 Start hole 4 Processing slit 5A, 5B Upper head part 6A, 6B Lower head part 7 Z-axis base 8 Column 9 Wire electrode supply system 10 Tension roller 11 Source bobbin 12 Guide roller 13 Brake pulley 16 Felt pad 17 Felt brake 18 Pulley opening / closing lever 22 Pull-out roller 23 Discharge wire guide 25 Source bobbin shaft 26 Processing tank 27 Discharge wire hopper 28 Base 29 Work table 30 NC power supply 31 Lower arm 34 Z-axis movable body 35 Upper head face plate 36 Lower head Face plate 37 Support column 38, 41 Guide roller 39, 40, 42 Direction changing roller 43 Working fluid filtration device 44 Clamp 45 Locking spring

 ──────────────────────────────────────────────────続 き The continuation of the front page F term (reference) 3C059 AA01 AB05 FB01 JA03 JA10

Claims (7)

[Claims] 1. A work fixed to a work table by a wire electrode fed through a wire electrode supply system is generated by applying a gap voltage between the wire electrode and the work and generating discharge energy. In a wire electric discharge machine for machining, a plurality of machining portions of the workpiece are respectively set between a pair of upper head portions attached to a Z-axis movable body and a pair of lower head portions attached to a lower arm. Wherein one wire electrode fed from the wire electrode supply system is inserted into a start hole or a processing slit of each of the plurality of processing portions of the workpiece to simultaneously process the plurality of processing portions. Wire electric discharge machine capable of simultaneous machining of multiple machining sections. 2. The plurality of processing parts of the workpiece may be processing parts in a predetermined area at a plurality of locations of one workpiece, or each of the plurality of processing parts may be predetermined at one location of the plurality of workpieces. 2. A processing part for an area.
A wire electric discharge machine capable of simultaneous machining of a plurality of machining sections according to item 1. 3. The pair of upper head portions are mounted separately from each other on an upper head face plate fixed to a lower portion of the Z-axis movable body provided on a Z-axis base so as to be movable up and down. 2. The lower head part is spaced apart from a lower head face plate fixed to a tip part of the lower arm corresponding to the pair of upper head parts, respectively.
A wire electric discharge machine capable of simultaneous machining of a plurality of machining sections according to item 1. 4. The plurality of processing portions of the workpiece are provided between one upper head portion and one lower head portion, and between the other upper head portion and the other lower head portion. The wire electric discharge machine according to claim 1, wherein the wire electric discharge machine is capable of simultaneously machining a plurality of machining portions. 5. One of the wire electrodes fed from the wire electrode supply system includes the one upper head portion, the one processing portion of the workpiece, the one lower head portion, and the other lower head. Part, the other processing part of the workpiece,
5. The wire electric discharge machine according to claim 4, wherein the wire electric discharge machine is capable of simultaneously machining a plurality of machining sections. 6. The wire electrode supply system includes: a source bobbin that winds up the wire electrode; a brake pulley that applies a brake to the wire electrode; a tension roller that applies tension to the wire electrode; A first guide roller attached to the Z-axis base for guiding an electrode; a pair of directions provided on the lower head for guiding the wire electrode sent from the one lower head to the other lower head; A conversion roller, a second guide roller provided on the Z-axis base for guiding the wire electrode sent from the other upper head portion toward the Z-axis base, and the wire passing through the second guide roller. 5. The multi-function device according to claim 4, further comprising a pull-out roller for pulling in the electrode and discharging it to a waste wire hopper. Wire electric discharge machine which can process several parts simultaneously. 7. The wire electric discharge machine according to claim 1, wherein the plurality of workpieces are fixed to a plurality of clamps fixed to the work table, respectively. Machine.