JPH074698B2 - Wire electric discharge machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wire electric discharge machine, and particularly to a wire electric discharge machine having a guide pipe that penetrates a wire electrode used for electric discharge machining and guides the wire electrode to a recovery part. Related to the improvement of.

[Prior Art] FIG. 2 is a schematic configuration diagram mainly showing a wire path of a conventional wire electric discharge machine. FIG. 3 is a sectional view showing the structure of the guide pipe portion in the wire electric discharge machine shown in FIG. In particular, it shows an outline of the wire path when the wire electrode is automatically inserted.

In the figure, 10 is a wire electrode, which is a brake pulley.
After passing through 11 and the idlers 13a, 13b, 13c, the wire is discharged from the wire collecting section 14 whose enlarged view is shown in FIG.
Reference numeral 15 denotes a pipe guide, which has a die guide 16 at the tip thereof, and is held at a fixed position by a holding device (not shown) during wire electric discharge machining, so that the workpiece 17 can be held at a predetermined position. Guide the wire electrode 10. Also,
During the automatic supply of the wire electrode 10, the drive unit (not shown) moves together with the wire feeding mechanism 18 to guide the wire electrode 10 right above the lower guide 19. 20 is the wire electrode 10
Is a guide for changing the feeding direction of the wire guide 21, and 21 is a taper introduction portion having an introduction hole opened in a taper shape, which guides the wire electrode 10 to the guide pipe 23 fixed to the lower arm 22 of the main body by the fixture 22a. There is. 24 is a processing power supply device,
By applying a voltage between the wire electrode 10 and the work piece 17, energy for generating an electric discharge and cutting the work piece into a predetermined shape is supplied.

Next, the operation of the wire electric discharge machine configured as described above will be described.

When the wire electrode 10 is automatically supplied to a predetermined path, the pipe guide 15 and the wire feeding mechanism 18 are operated by a driving device (not shown), and the die guide 16 provided at the tip portion of the pipe guide 15 is moved downward. Side guide 19 just above. After that, when the wire feeding mechanism 18 is operated, the wire electrode 10 passes through the lower guide 19, the direction is changed by the guide 20, is guided to the guide pipe 23 by the taper introducing portion 21, and passes through the inside thereof. By collection unit 14
Sent to.

In this way, when the feeding of the wire electrode 10 is completed, the pipe guide 15 returns to its original position and is held, in preparation for the start of the next processing.

[Problems to be Solved by the Invention] Since the conventional wire electric discharge machine is configured in this way, when water or foreign matter enters the inside of the guide pipe 23, the feeding of the wire electrode 10 is hindered. Since the wire cannot be fed, the probability that the wire electrode 10 can be automatically fed decreases. In particular, when unmanned driving is performed at night or the like, unmanned driving becomes impossible and the operation is stopped.

By analogy, if water or foreign matter gets inside the guide pipe 23 even when not performing unattended operation, it is necessary to attach and detach for maintenance such as cleaning, but not only is it difficult to attach and detach, but maintenance is also difficult. Since it takes a long time to perform the adjustment during the subsequent reassembly, the operation rate of the wire electric discharge machine is reduced.

Furthermore, since the guide pipe 23 is made of a conductive material, if water adheres between the wire electrode 10 and the guide pipe 23 during processing, an electric discharge occurs and the inner wall of the guide pipe 23 is damaged, There are problems that the scratches prevent the wire electrode 10 from being inserted, and the success rate for the automatic supply of the wire electrode 10 is reduced.

Therefore, the present invention has been made in order to solve such a problem, and the maintenance such as cleaning can be easily performed, the reproducibility at the time of reassembly is easy, and the adjustment does not require a long time. An object of the present invention is to provide a wire electric discharge machine that shortens the maintenance time to improve the operation rate and prevents the occurrence of scratches that prevent the insertion of the wire electrode on the inner wall surface of the guide pipe due to the occurrence of electric discharge.

[Means for Solving the Problems] In the wire electric discharge machining apparatus according to the present invention, the guide pipe is held by a fixed portion, one end thereof is squeezed into a tapered shape, and substantially the entire length except for the tapered end portion. A uniform diameter, and a first pipe having an opening at the center of the tapered end,
A second pipe, which has a shape that is detachable from the other end of the first pipe that is not tapered and is made of a flexible insulator, and is bendable, and the second pipe. A taper introduction part having a tapered introduction hole for guiding the wire electrode to the center of the second pipe, the center line of the first pipe, and The center line of the first pipe and the center line of the second pipe are concentric, and the openings formed at the center of the tapered introduction portion of the second pipe and the center of the tapered end portion of the first pipe. The center is set substantially on the same axis as the central axes of the first pipe and the second pipe.

[Operation] The wire electric discharge machine according to the present invention includes the fixed first
By guiding the second pipe which carries the wire through it by the pipe of No. 2, it is not necessary to attach and detach the pipe by attaching and detaching the fixing tool, which not only facilitates maintenance but also The center line of the first pipe, the center line of the second pipe, the center of the tapered introduction portion of the second pipe, and the center of the opening formed at the center of the tapered end of the first pipe are By setting the pipe and the second pipe on substantially the same central axis, reproducibility at the time of reassembling is improved, so that it becomes easy to improve the operating rate of the wire electric discharge machine.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a structure of a guide pipe portion of a wire electric discharge machine according to an embodiment of the present invention.

In FIG. 1, 25 is a first pipe fixed to the lower arm 22 via a fixture 22a, and 26 is mounted inside the first pipe 25, and a second pipe for inserting the wire electrode 10 therethrough is inserted. The pipe is made of an insulating material and has one end connected to the taper introducing portion 21.

That is, in the present embodiment, as shown in the drawing, in the wire electric discharge machine having a guide pipe that penetrates the wire electrode 10 used for electric discharge machining and guides it to the recovery part 14, the guide pipe is held at a fixed portion. A first pipe 25 having one end squeezed into a tapered shape and having a substantially uniform length except the tapered end and having an opening at the center of the tapered end.
A second pipe 26, which is made of a flexible insulating material and has a shape that is detachable from the other end portion of the first pipe 25 that is not tapered and is flexible, and Attached to the end of the second pipe 26, the wire electrode 10
And a taper introducing portion 21 having a taper introducing hole for guiding the second pipe 26 to the center of the first pipe 25.
Second center line concentric with the center line of the first pipe 25
Center line of the second pipe 26 and the taper introduction portion of the second pipe 26
The center of 21 and the center of the opening formed at the center of the tapered end of the first pipe 25 are arranged so as to be substantially on the same straight line as the first pipe 25 and the second pipe 26. .

In the wire electric discharge machine configured as described above, the wire electrode 10 passes through the lower die 19, and then is changed in direction by the guide 20 and supplied to the taper introducing portion 21. Then, the wire electrode 10 passing through the taper introducing portion 21 is fed to the collecting portion 14 via the second pipe 26 connected to the rear end of the taper introducing portion 21.

Therefore, for example, if a foreign matter such as moisture adheres to the inside of the second pipe 26, the traveling of the wire electrode 10 is hindered and the wire electrode 10 cannot be fed. In this case, the second pipe 26 connected to the rear portion of the taper introducing portion 21 is extracted from the first pipe 25 to remove the foreign matter. In this way, when the cleaning operation for the second pipe 26 is completed, the second pipe 26 is inserted into the first pipe 25, and its end portion is connected to the rear end of the taper introducing portion 21. To do.

At the time of this assembly, since the first pipe 25 is fixed to the lower arm 22 via the fixture 22a, the second pipe 26 is positioned and fixed only by inserting it into the first pipe 25. Moreover, as shown in FIG. 1, it is formed in the center lines of the first pipe 25 and the second pipe 26, the introduction hole of the tapered introduction portion 21, and the center of the tapered end portion of the first pipe 25. Since the openings are arranged so as to be substantially on the same straight line, reproducibility at the time of reassembly is significantly improved.

Further, even if moisture adheres to the inside of the second pipe 26, since the second pipe 26 is made of an insulator, a discharge occurs between the wire electrode 10 and the second pipe 26. Does not occur, and with this, the second pipe
There is also no risk of damage to the inside of the wire 26 that prevents the wire electrode 10 from traveling.

[Advantages of the Invention] As described above, in the wire electric discharge machine having the guide pipe for penetrating the wire electrode used for electric discharge machining of the present invention and guiding the wire electrode to the recovery part, the guide pipe is held at the fixed portion. A first pipe having one end tapered into a tapered shape, the entire length except for the tapered end has a uniform diameter, and the center of the tapered end is opened;
A second pipe, which has a shape that is detachable from the other end of the first pipe, which is not tapered, and which is formed of a flexible insulator and is bendable, and the second pipe. A taper introduction part having a tapered introduction hole for guiding the wire electrode to the center of the second pipe, the center line of the first pipe, and The center line of the second pipe, which is concentric with the center line of the first pipe, the center of the tapered introduction portion of the second pipe, and the center of the opening formed at the center of the tapered end portion of the first pipe. The center axes of the first pipe and the second pipe are set to be substantially the same.

As described above, since the first pipe and the second pipe inserted into the first pipe and through which the wire electrode passes are formed, the second pipe for guiding the wire electrode is provided. Easy to attach and detach the pipe. In addition, the center lines of the first pipe and the second pipe, the introduction hole of the taper introducing portion, and the opening formed at the center of the tapered end portion of the first pipe are substantially collinear, Improves reproducibility during assembly. Naturally, the success rate for the automatic supply of the wire electrode is increased, and as a result, the operation rate of the wire electric discharge machine is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a guide pipe portion of a wire electric discharge machine according to an embodiment of the present invention, and FIG. 2 is a schematic structure diagram mainly showing a wire path of a conventional wire electric discharge machine, and FIG. FIG. 3 is a cross-sectional view showing a configuration of a guide pipe portion in the wire electric discharge machine shown in FIG. In the figure, 10: wire electrode, 11: brake pulleys 13a, 13b, 13c: idler 14: wire collecting part, 15: pipe guide 16: die guide, 17: workpiece 18: wire feeding mechanism, 19: lower guide 20: Guide, 21: Taper introduction part 22a, 22b: Fixture, 23: Guide pipe 24: Power supply device for processing, 25: First pipe 26: Second pipe In the drawings, the same reference numerals are the same or equivalent. It shows a part.

Claims (1)

[Claims] 1. A wire electric discharge machine having a guide pipe for penetrating a wire electrode used for electric discharge machining and guiding the wire electrode to a recovery part, wherein the guide pipe is held by a fixed part and one end thereof is tapered. A first stop in which the diameter of the aperture is substantially the same except the tapered end, and the center of the tapered end is opened.
And a second pipe, which is formed from a flexible insulator and has a removable external shape from the other end of the first pipe which is not tapered in a tapered shape, and which is bendable,
A taper introduction portion having a taper introduction hole that is attached to an end portion of the second pipe and guides the wire electrode to the center of the second pipe; A center line of the first pipe and a center line of the second pipe are concentric with each other, and are formed at the center of the tapered introduction portion of the second pipe and the center of the tapered end portion of the first pipe. A wire electrical discharge machine, wherein the center of the opening is set on substantially the same axis as the central axes of the first pipe and the second pipe.