JPH09267221A - Wire cutter of wire electric discharge machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably remove an uncut-left wire electrode by providing an auxiliary wire sending means in a guide body arranged between a wire sending means and a wire cutting means in a device to cut and recover the wire electrode after machining, which is used for wire electric discharge machining. SOLUTION: An electric current is carried to a wire electrode 8 and a workpiece by a pulse electrode, and electric discharge machining is performed in a microscopic clearance between the wire electrode 8 and the workpiece. After this electric discharge machining, the wire electrode 8 discharged from wire recovering rollers 15 and 16 is finely cut by a rotary cutting edge 22 and a fixed cutting edge 27 in a wire cutter 17, and is dropped in a wire recovering box 23. After the wire electrode 8 is cut, the wire electrode 8 is completely discharged by rotating the wire recovering rollers 15 and 16 for a constant time, and an uncut-left electrode 8a is forcedly sent into the wire cutter 17 by compressed air discharged from a compressed air discharge port 24 while being guided by a guide body 28, and is completely discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire cutting device for a wire electric discharge machine.

[0002]

2. Description of the Related Art FIGS.
It is a figure which shows the wire cutting apparatus of the conventional wire electric discharge machine described in. In FIG. 10, a machining tank 2 is placed on a base 1 of the wire electric discharge machine,
In the working tank 2, an insulating working liquid (distilled water or a mixed liquid of distilled water and oil) is fed from the working liquid supply device 4 so that the workpiece W fixed on the work table 3 is immersed in the working liquid. ) 5, the contaminated working fluid 5 is collected in the working fluid supply device, filtered through a filter or the like, and then circulated again to be fed.

A wire bobbin 9 around which a wire electrode 8 is wound is provided on the upper portion of the column 7, and an upper guide portion 11 is formed on an upper arm 10 supported on the upper portion of the column 7. Further, a lower guide portion 13 is arranged on the lower arm 12 supported on the lower portion of the column 7. The wire electrode 8 pulled out from the wire bobbin 9 is stretched from the upper guide portion 11 to the lower guide portion 13 via the workpiece W in a substantially vertical shape, and is connected to the wire electrode 8 and the workpiece W from a power source (not shown). Electric discharge machining is performed in a minute gap (electric discharge machining section) between the workpiece W and the wire electrode 8 passing vertically downward by passing a pulse current. It should be noted that the machining liquid 5 is jetted toward the electric discharge machining portion from a nozzle portion (not shown) in both or one of the upper guide portion 11 and the lower guide portion 13 to remove metal scraps in the electric discharge machining and perform electric discharge machining. Cool down the section and execute. The transport speed (moving speed) of the wire electrode 8 varies depending on the electric discharge machining conditions, the plate thickness of the workpiece W, etc., but is generally about 50 to 300 mm / sec. For example, when the plate thickness is 50 mm, 100 mm / sec. It is a degree.

FIG. 11 shows a detailed view of the wire cutting device of the present invention. In FIG. 11, 15 and 16 are wire collecting rollers. A wire cutting device 17 is connected to the wire electrode exit sides of the wire collecting rollers 15 and 16, and 18 is a slide mechanism thereof. In addition, 19 is a wire guide, 20 is a control device of a wire electric discharge machine, 21, 22, and 23 are a wire cutting motor, a wire cutting blade, and a wire collection box, respectively.

Next, the operation will be described. The wire electrode 8 discharged from the wire collecting rollers 15 and 16 after passing through the wire guide 19 is finely cut by a wire cutting blade 22 mounted in front of the wire cutting device 17, and dropped into a wire collecting box 23. . In order to pass the wire electrode 8 through the processing start hole (not shown) of the workpiece, the wire electrode 8
When the wire electrode 8 is cut during processing, or when the wire electrode 8 is broken during processing, the wire collecting rollers 15 and 16 and the wire cutting device 17
The wire electrode 8a is always left between the wire cutting blades 22a and 22b. If there is the uncut wire electrode 8a, the wire cutting device 17 is once moved by the slide mechanism 18 in the direction away from the wire collecting rollers 15 and 16 (leftward in FIG. 11). Like A, it falls into the wire collection box 23. After that, the wire cutting device 17 is moved rightward in the figure and returned to the original position. The slide mechanism 18 functions to move the wire cutting device 17 away from the wire collecting rollers 15 and 16, and the moving direction may be horizontal or vertical.

The discharge operation of the wire electrode 8 is completed as described above. When machining is performed again, the wire electrode 8 is stretched from the wire guide 19 to the wire cutting device 17 by using an automatic wire feeder (not shown) mounted on the wire electric discharge machine. In order to determine whether there is any uncut wire electrode 8a, an optical sensor or the like is installed between the wire collecting rollers 15 and 16 and the wire cutting device, or the contact of the wire electrode is judged by the electric resistance. can do. Alternatively, the wire collection roller 1
Since the electrodes 5 and 16 are displaced depending on whether or not the wire electrode 8 is sandwiched between them, it is possible to determine the displacement amount. Further, when the wire electrode is cut using the automatic wire feeder, the wire electrode is always left uncut. Therefore, after the wire electrode is cut, the wire collecting rollers 15 and 16 are kept for a certain time
After the wire electrode 8 is discharged by rotating the wire electrode 8, the wire cutting device may be forcibly moved.

[0007]

Since the conventional wire cutting device is constructed as described above, the wire cutting device is used to remove the wire electrode remaining between the wire feeding device and the wire cutting device. It has a large-scale structure of dropping the wire feeding device away from the wire feeding device, which is expensive.

In terms of function, there is a possibility that the residual wire electrode may be caught or adhere to the slide mechanism of the wire cutting device due to the action of compressed air even after the wire cutting device is moved away from the wire feeding device. There is a risk that the movement operation of the wire cutting device may be stopped on the way by sandwiching the wire. In particular, the wire electrode after processing tends to have moisture attached to the uneven shape of the surface, so that wire cutting debris is likely to adhere to the inner wall of the wire cutting device. There was a risk that it would get caught in the middle and rotation would stop.

Regarding the service life, it is necessary to replace the rotary blade or the fixed blade of the wire cutting device every time when the blade cannot be cut due to its service life, which not only increases the running cost but also the service life of the cutting blade. At that time, there was a fatal defect that the processing could not be restarted when there was no substitute for the wire cutting device.

The present invention has been made in order to solve the above problems, and provides a wire cutting device for a wire electric discharge machine capable of reliably removing the uncut wire electrode with a simple structure. Another object of the present invention is to provide a wire cutting device for a wire electric discharge machine that further improves the life of the wire cutting device. Another object of the present invention is not only to provide a wire cutting device for a wire electric discharge machine that is compatible with a drooping method, but also to provide a wire cutting device for a wire electric discharge machine in which a cutting function is reliably maintained during machining. . It is another object of the present invention to provide a wire cutting device for a wire electric discharge machine that can easily cope with changes in the diameter of the wire electrode.

[0011]

A wire cutting device for a wire electric discharge machine according to a first aspect of the present invention is a wire cutting device for a wire electric discharge machine which cuts and collects a processed wire electrode used for wire electric discharge machining. In, wire feeding means for feeding the wire electrode, wire cutting means for cutting the wire electrode fed by the wire feeding means, and a guide body arranged between the wire feeding means and the wire cutting means, The guide body is provided with auxiliary wire feeding means for feeding compressed air to remove residual wire electrodes.

A wire cutting device for a wire electric discharge machine according to a second invention is the wire cutting device for a wire electric discharge machine according to the first invention, which detects wire insertion through which a wire electrode has been inserted into the wire cutting device. And a wire traveling route detecting means for detecting the wire traveling route.

A wire cutting device for a wire electric discharge machine according to a third invention is the wire cutting device for a wire electric discharge machine according to the second invention, wherein the wire insertion detecting means and the wire traveling path detecting means are separable into guide bodies. It is supposed to be supported.

A wire cutting device for a wire electric discharge machine according to a fourth aspect of the present invention is the wire cutting device for a wire electric discharge machine according to any one of the first to fourth aspects, wherein the wire cutting means has a rotary cutting blade and a plurality of fixed parts. In addition to being configured by a unit having a cutting blade, there are a plurality of cutting portions formed by the rotary cutting blade and the plurality of fixed cutting blades.

A wire cutting device for a wire electric discharge machine according to a fifth aspect of the present invention is the wire cutting device for a wire electric discharge machine according to the first aspect, wherein the wire cutting means is removable and a protective cover can be attached. It is designed to be configured.

A wire cutting device for a wire electric discharge machine according to a sixth invention is the wire cutting device for a wire electric discharge machine according to any one of the first through fourth inventions, wherein the wire cutting means is synchronized with the running of the wire electrode. The compressed air is jetted to the cutting part of the.

A wire cutting device for a wire electric discharge machine according to a seventh aspect of the present invention is the wire cutting device for a wire electric discharge machine according to the first aspect of the present invention, wherein the pressing force of the pair of rollers constituting the wire feeding means against the wire electrode is spring. It is generated by and is changed by adjusting the deformation amount of the spring.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Embodiments embodying the present invention will be described. In FIG. 1, a machining tank 2 is placed on a base 1 of a wire electric discharge machine, and a workpiece W fixed on a work table 3 is immersed in the machining liquid in the machining tank 2. As described above, the insulating working liquid (distilled water or a mixed liquid of distilled water and oil) 5 is supplied from the working liquid supply device 4, and the contaminated working liquid 5 is collected by the working liquid supply device and passed through a filter or the like. And then recirculate and supply.

A wire bobbin 9 around which a wire electrode 8 is wound is provided on the upper part of the column 7, and an upper guide part 11 is formed on an upper arm 10 supported on the upper part of the column 7. Further, a lower guide portion 13 is arranged on the lower arm 12 supported on the lower portion of the column 7. The wire electrode 8 pulled out from the wire bobbin 9 is stretched from the upper guide portion 11 to the lower guide portion 13 via the workpiece W in a substantially vertical shape, and is connected to the wire electrode 8 and the workpiece W from a power source (not shown). Electric discharge machining is performed in a minute gap (electric discharge machining section) between the workpiece W and the wire electrode 8 passing vertically downward by passing a pulse current. It should be noted that the machining liquid 5 is jetted toward the electric discharge machining portion from a nozzle portion (not shown) in both or one of the upper guide portion 11 and the lower guide portion 13 to remove metal scraps in the electric discharge machining and perform electric discharge machining. Cool down the section and execute. The transport speed (moving speed) of the wire electrode 8 varies depending on the electric discharge machining conditions, the plate thickness of the workpiece W, etc., but is generally about 50 to 300 mm / sec. For example, when the plate thickness is 50 mm, 100 mm / sec. It is a degree.

Next, FIG. 2 shows a detailed view of the wire cutting device of the present embodiment. In FIG. 2, 15 and 16 are wire collecting rollers. A wire cutting device 17 is arranged on the wire electrode exit side of the wire collecting rollers 15 and 16. In addition, 19 is a wire guide, 20 is a controller of the wire electric discharge machine, and 21 and 26 are a wire cutting motor and a wire feed motor, respectively. Further, a guide body 29 is arranged between the wire collecting rollers 15 and 16 and the wire cutting device 17, and the compressed air discharge port 24 is provided in the guide body 29. 23 is a wire collection box.

Next, the operation will be described. The wire electrode 8 discharged from the wire collecting rollers 15 and 16 is finely cut by the rotary cutting blade 22 and the fixed cutting blade 27 in the wire cutting device 17, and dropped into the wire collecting box 23. When the wire electrode 8 is cut in order to pass the wire electrode 8 through a processing start hole (not shown) of the workpiece or when the wire electrode 8 is disconnected during processing, the wire electrode is once completely discharged, The wire electrode 8a always remains between the wire collecting rollers 15 and 16 and the rotary cutting blade 22 in the wire cutting device 17. The uncut wire electrode 8a is forcibly sent to the wire cutting device 17 and completely removed by the compressed air discharged from the compressed air discharge port 24 while being guided by the guide body.

Further, when the wire electrode is cut by using the automatic wire feeder, the wire electrode is always left uncut. Therefore, after the wire electrode is cut, the wire collecting rollers 15 and 16 are rotated for a certain time to completely discharge the wire electrode, and then the compressed air is discharged to collect the collecting rollers 15 and 16.
The wire electrode left uncut between the fixed cutting blade 22 inside the wire cutting device 17 is removed.

Embodiment 2 FIG. FIG. 3 shows another embodiment. In FIG. 3, reference numeral 30 is a wire insertion detecting ring embedded in the guide body 29. As shown in FIG. 4A, a pin 30a is fixed in contact with the detection ring 30. As shown in the figure, the compressed air discharge port 24 is electrically connected to the guide port 29a passing through the center of the guide body 29 from two places on the left and right sides in the traveling direction of the wire electrode.
The air reservoirs 24c to 24a provided in
4b is a guide port 29a from the opposite side, bypassing the guide port 29a.
Leads to.

In the present embodiment, there are two compressed air discharge ports, but if the function is satisfied, it may be one, and if the conveying force is to be further increased, as shown in FIG. There is also a method in which a spiral flow is generated by providing the outlet displaced from the center of the guide port. This may be one place or two places. The wire travel route detection plate 31 is fixed to the machine body. Other configurations are the same as those in FIG.

Next, the operation will be described. The wire electrode 8 and the detection ring indicate that the wire electrode 8 has reached the collecting rollers 15 and 16 when the wire electrode is stretched, such as when the wire electrode is passed through the processing start hole of the workpiece or when the wire electrode is broken during processing. It is detected by the continuity of 30. The detection of the wire electrode path is detected by the wire electrode 8 coming into contact with both the travel path detection plates 31a and 31b, which are arranged above and below the travel path. Compressed air for removing the wire electrode 8a is supplied from the machine body side and flows into the discharge ports 24a and 24b from the air reservoir 24c of the guide body 29.

When the wire electrode is blocked due to the life of the wire cutting device 17 or the like and it is impossible to recover by going out of the traveling route as in 8 ', it is necessary to remove the guide body 29 for repair. . Also in this case, the insertion detection ring 30 is brought into conduction by contacting a spring plate (not shown) on the machine body side via the bolt 30a, and the path detection plate 31 is also fixed to the machine body side. The guide body 29 is connected to the machine body by being closely attached and fixed thereto, and there is no wiring or piping attached to the guide body 29, so that the attachment and detachment is very easy.

Embodiment 3 FIG. 5 shows another embodiment. 5A and 5B are sectional views showing the relative relationship between the cutting unit 18 and the guide body 29. The cutting unit 18 includes a rotary cutting blade 22, a fixed cutting blade 27, and a housing 25 that supports them. Two fixed cutting blades 27 are arranged so as to be axially displaced from the rotary cutting blade 22 so as to face each other.

Next, the operation will be described. In the initial state, the first fixed cutting blade 27a is positioned at the outlet of the guide body 29 as shown in FIG. Next, when the rotary cutting blade 22 has reached the end of its life, the cutting unit 18 is rotated 180 ° in the axial direction of the rotary cutting blade, and is moved in parallel in the axial direction of the paper, as shown in FIG. Since the cutting position of the rotary cutting blade 22 can be changed as described above, the rotary cutting blade 22 can be used twice.

At this time, the fixed cutting blades 27a to 27
However, when the fixed cutting blade 27a has not reached the end of its life, it can be used without waste by replacing it with 27b. Since the fixed cutting blade 27 has a cylindrical shape, when it reaches the end of its life, it can be used twice by rotating itself about the axis by 180 °.

Further, in the present embodiment, the rotation angle of the cutting unit is set to 180 °, but this is set to 120 ° and the housing 25 is provided with three faces at every 120 °, and three fixed cutting blades 27 are provided. If provided, the rotary cutting blade 22 can be used three times. Further, the cutting unit 18 and the cutter motor 2
If the coupling with 1 is formed as shown in FIG. 6, the flattened portion provided on the shaft of the cutting unit 18 comes into contact with the side wall of the groove provided in the coupling during rotation to transmit torque. Since it is not necessary to fix the ring to the shaft of the cutting unit 18 by fastening a screw or the like, replacement and rotation of the cutting unit 18 become very easy.

Embodiment 4 FIG. FIG. 7 shows another embodiment. In FIG. 7, the wire cutting device 17 is configured to be detachable together with the case 28, and the protective cover 33 can be attached after the removal. Other configurations are the same as those in FIG. Next, the operation will be described. With the configuration according to the present embodiment, for example, when the wire cutting device 17 has reached the end of its life, the wire electrode can be removed by the conventional (non-cutting) drooping method even if a substitute for the cutting unit is not prepared. It is possible to collect it temporarily.

Embodiment 5 FIG. 8 shows another embodiment. In FIG. 8, the case 28 has compressed air intake 34a.
The compressed air feed port 34b is disposed on the main body side.
Other configurations are the same. Next, the operation will be described. The controller 20 gives a rotation command to the roller 15 and at the same time ejects compressed air from 34b. The compressed air causes the cutting fragments to be forcedly dropped and at the same time acts to dry the inner surface of the housing.Therefore, there is no accumulation of wire cutting fragments and there is a risk of biting between the rotating cutting blade and the fixed cutting blade and stopping rotation. Is completely eliminated.

Embodiment 6 FIG. FIG. 9 shows another embodiment. In FIG. 9, the coil spring 35 is suspended and the pulling force is used as a means for pressing the roller 15 against the roller 15. At this time, one end of the coil spring is hooked on the rotary bearing of the roller 16, and the other end is hooked on the lever 36, and the lever 36 is rotatably supported on the body side and fixedly supported by the gear 37. Next, the operation will be described. By replacing the lever 36 with the respective grooves for the gear 37, the tension of the coil spring 35 changes. Therefore, the pressing force corresponding to the change in the diameter of the wire electrode can be easily obtained. Although the coil spring is shown in FIG. 9, other types of springs may be used as long as the amount of deformation of the spring can be adjusted to adjust the pressing force.

[0034]

As described above, in the wire cutting device of the wire electric discharge machine according to the first invention, the guide body is arranged between the wire feeding means and the wire cutting means, and the guide body is compressed in the middle portion thereof. Since the air is sent in and the remaining wire electrode is forcibly sent to the wire cutting means, the remaining wire electrode can be reliably removed with a simple structure.

Further, in the wire cutting device of the wire electric discharge machine of the second invention, since the wire insertion detecting means, the wire traveling path detecting means, and the auxiliary wire feeding means are provided in the guide body, the wire electrode is routed for some reason. It is possible to immediately stop the traveling of the wire electrode when it comes off.

Further, since the wire cutting device of the wire electric discharge machine according to the third aspect of the invention is configured so that the guide body can be easily separated in the second aspect of the invention, when the wire electrode is out of the path for some reason. Immediately stopping the running of the wire electrode and separating the guide body facilitates the removal of the wire electrode that has deviated from the path.

Further, in the wire cutting device of the wire electric discharge machine according to the fourth invention, the wire cutting means comprises a unit having a rotary cutting blade and a plurality of fixed cutting blades, and the rotary cutting blade and the plurality of fixed cutting blades are provided. Since it is configured to have a plurality of cutting sites formed in step 1, one unit can be used multiple times and the running cost can be reduced.

Further, in the wire cutting device of the wire electric discharge machine according to the fifth aspect of the invention, the wire cutting means can be removed and a protective cover can be attached instead. Even if there is no cutting device, it is possible to change to the runaway recovery method.

The wire cutting device of the wire electric discharge machine according to the sixth aspect of the invention is configured so that compressed air is jetted downward from above the cutting portion of the wire cutting means in synchronization with the running of the wire electrode. Therefore, there is an effect that the accumulation of wire electrode cutting fragments in the wire cutting device is prevented and the reliability of the cutting function during processing is further improved. .

Further, in the wire cutting device of the wire electric discharge machine according to the seventh aspect of the invention, the pressing force of the pair of rollers forming the wire feeding means against the wire electrode is generated by the spring and the deformation amount of the spring is adjusted to press the wire electrode. Since the force can be changed, it is possible to easily cope with the change of the diameter of the wire electrode.

[Brief description of drawings]

FIG. 1 is a side view of a wire electric discharge machine showing an embodiment of a first invention.

FIG. 2 is a side view of the wire cutting device of the wire electric discharge machine showing the embodiment of the first invention.

FIG. 3 is a side view of a wire cutting device of a wire electric discharge machine showing an embodiment of second and third inventions.

FIG. 4 is a detailed cross-sectional view of a guide body showing an embodiment of the second and third inventions.

FIG. 5 is a sectional view of a wire cutting device showing an embodiment of a fourth invention.

FIG. 6 is a perspective view of a wire cutting device and a coupling of a drive motor according to an embodiment of the fourth invention.

FIG. 7 is a side view of a wire cutting device of a wire electric discharge machine showing an embodiment of a fifth invention.

FIG. 8 is a side view of a wire cutting device of a wire electric discharge machine showing an embodiment of a sixth invention.

FIG. 9 is a side view of a wire cutting device of a wire electric discharge machine showing an embodiment of a seventh invention.

FIG. 10 is an overall configuration diagram of a conventional wire electric discharge machine.

FIG. 11 is a view showing a wire cutting device of a conventional wire electric discharge machine.

[Explanation of symbols]

8 ... Wire electrode, 15, 16 ... Wire collecting roller, 17 ... Wire cutting mechanism, 18 ... Wire cutting device, 19 ... Wire guide, 22 ... Rotary cutting blade, 23 ... ..Wire collection box, 24 ... Compressed air discharge port, 27 ... Fixed cutting blade, 28 ... Guide body, 30
... Wire insertion detection ring, 31 ... Wire traveling path detection plate, 32 ... Rotating cutting blade axis, 33 ... Protective cover, 34 ... Compressed air feed port, 35 ... Coil spring, 36 ... Lever, 37 ... Gear

Claims (7)

[Claims] 1. A wire cutting device of a wire electric discharge machine for cutting and recovering a processed wire electrode used for wire electric discharge machining, and a wire feeding means for feeding a wire electrode, and a wire feeding means for feeding the wire electrode. Wire cutting means for cutting the wire electrode; a guide body arranged between the wire feeding means and the wire cutting means; and an auxiliary wire feeding means for feeding compressed air to the guide body to remove residual wire electrodes. A wire cutting device for a wire electric discharge machine, comprising: 2. The wire cutting device for a wire electric discharge machine according to claim 1, wherein wire insertion detecting means for detecting that the wire electrode has been inserted into the wire cutting device, and wire traveling path detecting means for detecting the wire traveling path. A wire cutting device for a wire electric discharge machine, comprising: 3. The wire cutting apparatus for a wire electric discharge machine according to claim 2, wherein the wire insertion detecting means and the wire traveling path detecting means are detachably supported by the guide body. Wire cutting device. 4. The wire cutting device for a wire electric discharge machine according to claim 1, wherein the wire cutting means is composed of a unit having a rotary cutting blade and a plurality of fixed cutting blades, and the rotary cutting is performed. A wire cutting device for a wire electric discharge machine, comprising a plurality of cutting portions formed by a blade and the plurality of fixed cutting blades. 5. The wire cutting device for a wire electric discharge machine according to claim 1, wherein the wire cutting means is removable and a protective cover is attachable. Cutting device. 6. The wire cutting device for a wire electric discharge machine according to claim 1, wherein compressed air is blown to the cutting part of the wire cutting means in synchronization with the running of the wire electrode. A wire cutting device for a wire electric discharge machine. 7. The wire cutting device for a wire electric discharge machine according to claim 1, wherein the pressing force of the pair of rollers constituting the wire feeding means against the wire electrode is generated by the spring, and the deformation amount of the spring is adjusted. A wire cutting device for a wire electric discharge machine, characterized in that