JPH0545367B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a wire cut electric discharge machining method in which one wire electrode is folded back and machined using two wire electrodes, and an improvement of an apparatus for carrying out the above machining method. Regarding.

[Conventional technology]

A wire-cut electric discharge machining device has a wire electrode that is renewedly fed in the axial direction while a predetermined tension is applied, and a workpiece is opposed to the wire electrode from a direction approximately perpendicular to the wire electrode axis through an appropriate machining gap. Place the
During this machining, a machining voltage pulse is applied between the wire electrode and the workpiece with machining fluid flowing through it, and non-contact machining is performed using the electrical discharge phenomenon that occurs at this time. .

However, conventional wire-cut electric discharge machining equipment cannot supply a sufficient amount of machining fluid to the machining gap formed between the wire electrode and the workpiece depending on the machining shape, etc. Therefore, there were problems in that machining accuracy was significantly reduced and smooth machining could not be performed. Furthermore, the outer circumferential surface of the above-mentioned wire electrode becomes uneven due to the large number of discharge craters due to electric discharge, so there is a problem in that it is difficult to perform good finishing on such a damaged wire electrode. .

In order to solve the above problems, the first arm or processing head on the side that supplies and collects the wire electrode, and the electrode return device that folds back the wire electrode supplied from the first arm or processing head side. a second arm or processing head equipped with a device; an electrode transporting device for transporting and hanging the wire electrode from the side of the first arm or processing head to the electrode return device of the second arm or processing head; , a device for holding a workpiece, a processing feed device that causes the workpiece and a wire electrode reciprocating between the first and second arms or the processing head to face each other adjacently; and the workpiece and the wire. A power supply device and a power supply device that apply a voltage pulse for electric discharge machining between the electrodes, and a device that supplies machining fluid to a machining space where the workpiece and the wire electrode are closely opposed to each other, A wire-cut electric discharge machining apparatus has been developed in which machining is performed by a wire electrode that reciprocates between a second arm or a machining head.

Therefore, in the above-mentioned wire cut electric discharge machining device, one wire electrode is folded back to make two wires,
Since the machining is carried out using one wire electrode or essentially two wire electrodes, the machining gap area formed by the wire electrode and the workpiece becomes wide, and therefore, a sufficient amount of the machining gap of the machining fluid, and furthermore, by controlling the alignment or alignment direction of the two wire electrodes in relation to the machining feed direction, the one of the two folded wire electrodes that has not been damaged by the discharge Since the finishing process can be performed using a wire electrode, a good finished surface can be obtained.

Furthermore, it has been found that by using the above-mentioned apparatus, it is possible to easily process a workpiece into a complex cross-sectional shape.

[Problems to be solved by the present invention]

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to perform wire cut electrical discharge machining in which one wire electrode is folded back to form two reciprocating wire electrodes, and machining is performed using these two wire electrodes. The equipment is configured so that it can not only perform normal machining where the cut is perpendicular to the main plane of the workpiece, but also process other complex cross-sectional shapes easily and in a short time. There is a particular thing.

[Means for solving problems]

The above object is achieved by configuring the wire station to individually position the wire station that reciprocates between the first and second arms or the processing head, or to perform processing while controlling the position change. will be achieved.

[Effect]

According to the wire cut electric discharge machining method and the apparatus for carrying out the method according to the present invention, the first
Since the position of each wire electrode can be individually controlled on each outgoing and returning path of reciprocating between the second arm or processing head, it is possible to perform not only normal processing where the cut is perpendicular to the main plane of the workpiece. In addition, complex cross-sectional shapes can be processed easily and in a short time.

[Example] The details of the present invention will be specifically explained below with reference to the drawings.

FIG. 1 is an explanatory diagram showing a state in which a wire electrode is supplied along a predetermined electrode supply path in a wire cut electrical discharge machining apparatus according to the present invention, and FIG.
An enlarged explanatory view of the wire electrode automatic folding guide roller portion of the above device, FIG. 3 is an explanatory view showing one embodiment during machining in the wire cut electrical discharge machining device according to the present invention, and FIG. 4 is an explanatory diagram showing another embodiment. An explanatory diagram showing an example,
FIG. 5 is an explanatory diagram showing still another embodiment, FIG. 6 is an explanatory diagram showing still another embodiment, and FIG. 7 is an explanatory diagram showing still another embodiment.
It is an explanatory view showing still another different example.

In FIGS. 1 to 7, 1 is a part of the wire-cut electrical discharge machining apparatus according to the present invention, in which one wire electrode is folded back and made into two reciprocating wire electrodes, and machining is performed using these two wire electrodes. a first arm or processing head; 3 is a second arm or processing head;
These are attached to a column or the like erected on the top or side of the processing machine body (head). 4 is a wire electrode;
5 is a wire electrode supply roller 6, 7, 8 and 9 housed in the first arm or processing head 2;
10 is a guide roller, 10 is a power supply roller, 11 is a pinch roller, 12 is a winding capstan with tension, 23 is a brake roller with tension, 24 is a pinch roller, 13 is a wire electrode automatic folding guide roller, 14 is a guide roller, 14a is a wire electrode guide groove formed along a common line between the outer circumferential surface of the guide roller 14 and one plane perpendicular to the axis;
4b is a spiral wire electrode introduction groove connected to the wire electrode guide groove 14a, 14c is a cylindrical portion of the guide roller 14, 14d is a tip end of the guide roller 14, 15 is a motor for rotating the guide roller 14, 15a is a shaft of the motor 15; 16 is a slide table for moving the motor 15 in a direction perpendicular to the wire electrode 4; 17 is a base on which the slide table 16 is mounted; and 18 is a slide table mounted on the slide table 16. a turntable mounted thereon and imparting rotational motion to the motor 15;
9 is an extrusion bar, 20 is a workpiece, 21 is a motor for moving the slide table 16, 21a is a shaft of the motor 21, and 22 is a feed screw.

Note that the guide rollers 7, 8, 9 and the power supply roller 10 can be set at appropriate positions by adjusting the movement in the horizontal direction in the figure, so that the wire electrodes 4, which are folded back and made into two wires, are kept at a constant interval. It is also configured so that the two wire electrodes 4 can be sandwiched and brought into close contact with each other.

In the first arm or machining head 2 of the wire cut electric discharge machining apparatus 1, there are provided a wire electrode supply roller 5, a pinch roller 24, and a brake roller 2.
3. Built-in power supply roller 10, guide roller 9, pitch roller 11, capstan 12, and other wire electrode collection rollers (not shown).
Also, built in the second arm or processing head 3 are guide rollers 7, 8, a wire electrode automatic folding guide roller 13, and the like.

The extrusion bar 19 is supported so as to be movable in the vertical direction, and the portion of the extrusion bar 19 that contacts the wire electrode 4 is formed in a semicircular shape.

Initially, the extrusion bar 19 is pulled upward, and the guide roller 9 and the power supply roller 1
0 and between guide rollers 7 and 8, a constant interval is maintained so that the extrusion bar 19 can pass therethrough.

When the wire electrode 4 pulled out from the wire electrode supply roller 5 is wound around the brake roller 23, the guide roller 6, the pinch roller 11 and the capstan 12, and the wire electrode collection roller (not shown), the extrusion bar 19 is directed downward. The wire electrode 4 starts moving and is pushed down to the position of the guide roller 14 with the wire electrode 4 being engaged with the engagement groove at the tip.

That is, the extrusion bar 19 passes through the processing hole 20a of the workpiece 20 from between the guide roller 9 and the power supply roller 10, passes between the guide rollers 7 and 8, and transfers the wire electrode 4 from the wire electrode supply roller 5. It is forcibly pulled out via the stopped brake roller 23 and pinch roller 24, and pushed down to form an elongated U-shape.

When the semicircular portion of the extrusion bar 19 reaches a position opposite to the outer peripheral surface of the cylindrical portion 14c of the guide roller 14, the downward movement of the extrusion bar 19 is stopped. After that, press the extrusion bar 1
9 is slightly pulled upward, and the extrusion bar 1
The capstan 12 is left at the distal end portion of the cap 9 from where it is substantially stopped. A ring of wire electrodes 4 is formed.

At the same time, the slide table 16 equipped with the motor 15 starts moving toward the extrusion bar 19, and at the same time, the motor 15 rotates and the guide roller 14 starts rotating.

The guide roller 14 is integrally provided adjacent to the cylindrical portion 14c and the cylindrical portion 14c in which the wire electrode guide groove 14a is provided along the line of intersection between the outer circumferential surface and one plane perpendicular to the axis. It is formed of a conical part and a tip part 14d, which are provided with a spiral wire electrode introduction groove 14b that extends from the top to the wire electrode guide groove 14a.

Therefore, the tip portion 14d of the guide roller 14 is
The wire electrode 4 enters the loop formed at the tip of the extrusion bar 19, and when this entry process is completed, the wire electrode 4 starts rotating the capstan 12 or brings the capstan 12 which was decelerating to a predetermined running speed. At this time, the wire electrode 4 moves in the direction of the push-out bar 19 of the guide roller 14. The tension of the wire electrode 4 between the brake roller 23 and the capstan 12 and the rotation of the guide roller 14 cause the guide roller 14 to move in the direction of the push-out bar 19.
The wire electrode is guided from the spiral wire electrode introduction groove 14b formed in the wire electrode introduction groove 14b further passing through the wire electrode introduction groove 14b to the wire electrode guide groove 14a.

When the tip portion 14d of the guide roller 14 enters the loop of the wire electrode, or when the wire electrode 4 is further wound around the wire electrode guide groove 14a of the guide roller 14, the extrusion bar 19 is pulled upward, and the extrusion bar 19 The lifting operation is completed.

In the case of normal processing, the guide roller 9, the power supply roller 10, and the guide rollers 7 and 8 each move toward the wire electrode 4, and the wire folded into two by the guide roller 14 is removed. Electrode 4
are sufficiently close to, and even in close contact with, a predetermined state.

That is, the wire electrode 4 is connected to the wire electrode supply roller 5.
From there, through the guide roller 6 and the power supply roller 10,
From the workpiece 20 to the second arm or processing head 3
After passing through the guide roller 7 housed in the guide roller 7 and being folded back by the guide roller 14 and wrapped around the guide groove 14a, the workpiece 2 is removed from the guide roller 8.
0, passing through the guide roller 9, pinch roller 11 and capstan 12, and being accommodated in the first arm or processing head 2, or provided in the main body etc. to which the first arm or processing head 2 is attached and held. In addition, the wire electrodes are collected by a wire electrode collection roller (not shown).

According to the technique previously disclosed by the present inventors, one wire electrode 4 is folded back and made into two reciprocating wires by the wire electrode automatic folding guide roller 13, as shown in FIG. The folded wire electrode 4 is brought close enough to or in close contact with each other between the power supply roller 10 and the guide roller 9, and between the guide rollers 7 and 8, and is connected to the workpiece 20 and the power supply roller 10 from a power supply device (not shown). A machining voltage pulse was applied to the wire electrode 4 via the wire cut electric discharge machining.

Therefore, in the present invention, the wire electrodes 4 folded back into two by the guide roller 14 are not brought into close contact with each other, but a predetermined interval is maintained between the wire electrodes 4, or they are crossed. In this state, processing is performed while appropriately controlling the method of maintaining the interval, the crossing direction, and the direction of relative processing feed between the wire electrode 4 and the workpiece 20 in relation to each other.

For example, as shown in FIG. 4, even after the extrusion bar 19 is pulled upward, the guide roller 9, the power supply roller 10, and the guide rollers 7 and 8 do not move toward the wire electrode 4 and maintain their state. Or a wire electrode in which one or both of the guide roller 9, the power supply roller 10, and the guide rollers 7 and 8 move a certain distance outward or inward around the wire electrode 4, and are folded back into two. Processing is carried out with a predetermined interval maintained between the two.

In this case, the width of the machining groove and the manner of machining change depending on the direction of the machining feed on the paper of FIG. As described above, it is necessary to controllably rotate the wire electrode 4 with respect to the workpiece 20, for example, with the center between the reciprocating wire electrodes 4 as the central axis as the reciprocating wire electrodes 4 change.

Furthermore, depending on the shape of the work, it is also possible to perform the work with the wire electrodes 4 folded back into two intersecting each other at the center of the workpiece 20. In this case, as shown in FIG.
After the wire electrode 4 is wound around the guide groove 14a of the guide roller 14 by the guide roller 1
The turntable 18 equipped with the motor 15 that rotates the motor 4 is rotated 180 degrees, and the guide roller 9, the power supply roller 10, and the guide rollers 7 and 8 are moved to the right or left in the figure, so that the intersection position is the one being processed. After adjustment is made so that it is located at the processing center of the body 20, processing is performed.

The control for machining feed in this case is also the same as the fourth one described above.
This is almost the same as the case shown in the figure, and this also applies to the following embodiments.

Furthermore, as shown in FIGS. 6 and 7, by moving the guide roller 9, power supply roller 10, and guide rollers 7 and 8 to the right or left in the drawings, with the wire electrodes 4 crossed, The intersection point of the wire electrodes 4 can be formed above or below the processed portion of the workpiece 20, or at a desired position other than the processed portion.

Although not shown, it is also possible to process the wire electrode 4 with one of the forward and backward paths being perpendicular to the main plane of the workpiece 20 and the other being inclined.

Therefore, by adjusting the position of the guide roller 14, the positions of the guide roller 9, the power supply roller 10, and the guide rollers 7 and 8, the wire electrode 4, which has been folded back into two, can be placed at the processing part of the workpiece 20. Since it can be formed into a desired shape, even complex shapes can be processed easily and in a short time.

〔Effect of the invention〕

Since the present invention is constructed as described above, when the present invention is used, it is possible to freely control the position of the wire electrode that reciprocates between the first and second arms or the processing head. This means that even complex contours or special shapes can be processed easily and in a short time.

Note that the present invention is not limited to the embodiments described above. That is, for example, in this embodiment, the wire electrode 4 is guided by the guide roller 9, the power supply roller 10, and the guide rollers 7 and 8. Guide dies or boat-shaped guides that can be opened and closed depending on the situation can be used. In addition, the guide roller 14
The motor 15 connected to the sliding table 16
and the turntable 18, and the guide roller 9, the power supply roller 10, and the guide roller 7.
and 8 are moved outward or inward a predetermined distance with the wire electrode 4 as the center, and the wire electrode 4 folded back into two is formed into a desired shape on the processed part of the workpiece 20. I configured it to do this, but
The structure is such that the two folded wire electrodes 4 are formed into a desired shape in the processing portion of the workpiece 20 only by the movement of the guide roller 9, the power supply roller 10, and the guide rollers 7 and 8. It's okay. Furthermore, the present invention is not limited to slide tables and turntables, and other known moving functions can be used. Furthermore, the rotation angle of the motor 15 is
The angle is not limited to 180 degrees, and can be changed to a desired angle depending on the processing shape or processing conditions. Furthermore, although the guide roller is attached directly to the shaft of the motor, it is also recommended that the guide roller and the motor be attached via a gear so that the rotating speed of the guide roller can be controlled. In addition, the shape of the guide roller, the method of moving the extrusion bar, and its configuration can be changed in various ways. Examples of changes in which the wire electrode can be automatically or fully automatically stretched without manual operation include, for example, the tip of the extrusion bar. A predetermined length on the side is used as a pipe, and a wire electrode is introduced into the interior from the side, pulled out from the tip, and run back and forth along the outer surface of the pipe, and a ring of the wire electrode is created at the tip of the pipe. When the pipe is retreated, fluid such as air is temporarily injected from inside the pipe, and the ring of the wire electrode is held in the guiding shape at that time, and the guide roller 14 is fitted into the ring. It is possible to adopt a configuration such as providing a jig for inserting and holding the roller 14 into the ring, and furthermore, the method of controlling each part can be freely changed within the scope of the purpose of the present invention. encompasses all of them.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a state in which a wire electrode is supplied along a predetermined electrode supply path in a wire cut electrical discharge machining apparatus according to the present invention, and FIG.
An enlarged explanatory view of the wire electrode automatic folding guide roller portion of the above device, FIG. 3 is an explanatory view showing one embodiment during machining in the wire cut electrical discharge machining device according to the present invention, and FIG. 4 is an explanatory diagram showing another embodiment. An explanatory diagram showing an example,
FIG. 5 is an explanatory diagram showing still another embodiment, FIG. 6 is an explanatory diagram showing still another embodiment, and FIG. 7 is an explanatory diagram showing still another embodiment.
It is an explanatory view showing still another different example. DESCRIPTION OF SYMBOLS 1... Wire cut electrical discharge machining device, 2... First arm or processing head, 3... Second arm or processing head, 4... Wire electrode, 5... Wire electrode supply roller, 6, 7, 8, 9... Guide roller, 10... Power supply roller, 11... Pinch roller, 12... Capstan, 13... Wire electrode automatic folding guide roller, 14... Guide roller, 14
a...Wire electrode guide groove, 14b...Wire electrode introduction groove, 14c...Cylindrical part, 14d...Tip part,
15, 21... Motor, 15a, 21a... Shaft, 16... Slide table, 17... Base, 18... Turntable, 19... Extrusion bar, 20... Workpiece, 22... Feed screw , 23
...Brake roller, 24...Pinch roller.

Claims (1)

[Scope of Claims] 1. A first arm or processing head on the side that supplies and collects wire electrodes, and an electrode return device that folds back the wire electrodes supplied from the first arm or processing head side. a second arm or processing head, an electrode conveyance device that transports and hangs the wire electrode from the side of the first arm or processing head to the electrode return device of the second arm or processing head; a device for holding the workpiece; a processing feed device that causes the workpiece and a wire electrode that reciprocates between the first and second arms or the processing head to face each other adjacent to each other; and a space between the workpiece and the wire electrode. a power supply device and a power feeding device for applying voltage pulses for electric discharge machining to the first and second Using a wire cut electrical discharge machining device that performs machining with a wire electrode that reciprocates between arms or machining heads, machining is performed while individually controlling the position of the wire electrode that reciprocates between first and second arms or machining heads. A wire cut electric discharge machining method characterized by: 2. The wire cut electric discharge machining method according to claim 1, wherein the reciprocating path of the wire electrode intersects at a machining portion. 3. A first arm or processing head on the side that supplies and collects the wire electrode, and a second arm or processing head that is equipped with an electrode return device that folds back the wire electrode supplied from the first arm or processing head side. a processing head; an electrode transport device for transporting and hanging the wire electrode from the first arm or the processing head side to the electrode return device of the second arm or processing head; and a device for holding the workpiece; , a machining feed device that causes the workpiece and a wire electrode reciprocating between the first and second arms or the machining head to face each other adjacently; and a voltage pulse for electric discharge machining between the workpiece and the wire electrode. and a device for supplying machining liquid to a machining space where the workpiece and the wire electrode are closely opposed to each other. In a wire cut electric discharge machining device that performs machining using a reciprocating wire electrode, an electrode guide that defines the position of the forward path of the wire electrode and an electrode guide that defines the position of the return path of the wire electrode are provided so as to be individually settable or displaceable. . The wire-cut electrical discharge machining apparatus as described above, further comprising a device capable of individually controlling the positions of the respective guides according to a predetermined program. 4. The wire-cut electric discharge machining apparatus according to claim 3, wherein the reciprocating path of the wire electrode is parallel. 5. The wire cut electric discharge machining apparatus according to claim 3, wherein the reciprocating path of the wire electrode is V-shaped. 6. The wire-cut electrical discharge machining apparatus according to claim 3, wherein either the forward path or the backward path of the wire electrode is provided perpendicularly to the main plane of the workpiece, and the other path is provided at an angle.