JPS63139620A - Wire electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a wire feed trouble and to prevent the occurrence of an error during a work of positioning a wire vertically to table, by a method wherein by collision of water, injected through a nozzle disposed in a wire route, with the wire, refuse adhered thereto is removed, and is dried by a heater. CONSTITUTION:Water 51 in a tank 61 is pumped up through a piping 60 with the aid of a pump 53, the pressurized water flowing through a piping 59 is injected through a hole 52 and is collided with a wire 2 to remove refuse adhered on its surface. The injected water 51 is recovered in the tank 61 from a hole 62 though a piping 63, a valve 65, and a piping 64 togetherwith the refuse, the refuse is removed by means of a filter 66 and the water is reused. A valve 65 controls so that a water surface is normally situated in a level hither than that of the position, allowing the water 51 to be injected, of a nozzle 50 and prevents flying of the water 51. In relation to the wire 2 conveyed out from the water tank 57, the water 51 adhered in a residual manner to the surface thereof is removed by the aid of a heater 70 to eliminate a fear of the water being dropped in a feed route for the wire 2 to contaminate a device and a risk of poor insulation occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire electrical discharge machine with excellent machining accuracy.

[Prior art]

FIG. 4 shows a conventional wire electrical discharge machine, in which the electrode wire 2 wound around the bobbin 1 is reeled into reels 3, 4, 5, 4, 5, 4, 5, 4, 4, 5, 4, 5, 4, 5, 4, 4, 5, 4, 4, 5, 4, 4, 4, 4, 4, 4, 5, .
6 and then wound up by a pair of rollers 7.8. The wire 2 is connected to guides 10 and IIK placed above and below the workpiece 9.
The rollers 12, 13, 1 are positioned more precisely, and the center of the rotating shaft is movable up and down, and the speed of the rollers 12, 13, 1 is controlled so that the center of the rotation axis is movable up and down, and a weight (not shown) is added, so that the roller 4 is always at a predetermined position.
Tension is applied by 4.

The lower guide 11 is connected to the column 16 by the guide holder 15.
The column 16 is placed on a base (not shown) and is movable relative to the workpiece 9 in the left-right direction in FIG. 4 (hereinafter referred to as the X direction). In addition, %171Lt17b
is a contact for energizing the wire 2.

The upper guide 10 is fixed to the fiUV drive device 19 by a guide holder 18. The UV drive device 19 is a device for tilting the wire 2 necessary for taper processing, and moves the guide 10 relative to the guide 11 in the U direction parallel to the X direction and in the Y direction perpendicular to the U direction. Note that 20 has two axes that move the UV drive device 19 up and down with respect to the column 16.

Further, the table 21 on which the work 9 is placed is connected to the guide 11.
It is possible to move in the Y direction perpendicular to the X direction.

When processing, the wire 2 is
A voltage is applied between the wire 2 and the workpiece 9, and the wire 2 and the workpiece 9 are moved relative to each other while being discharged.

In order to ensure shape accuracy and positional accuracy in wire electrical discharge machining, it is necessary to accurately grasp the relative position between the workpiece 9 and the wire 2. Therefore, prior to processing,
It is necessary to position the wire 2 perpendicularly to the surface 23 of the table 21 on which the workpiece 9 serving as a reference for processing is placed.

FIG. 5 shows an example of the above-mentioned work, in which the nine jigs placed on the surface 23 are perpendicular to the bottom surface 25, and perpendicular to the side surfaces 26, 27 and the side surface 26, which are in the same plane and spaced apart. and has coplanar but spaced apart sides 28,29. A voltage of about 20 V is applied between the wire 2 and the side surfaces 26, 27, 28, 29, and when the wire 2 is brought close to touch the side surfaces 26, 27, the voltmeter 30,
If the guide 10 is positioned in the U direction so that the instructions 31 descend at the same time, the wire 2 will not be tilted in the X direction with respect to the surface 23. In this state, continue to move the guide 10 to Y.
If the wire 2 is moved in the direction and the tilt in the Y direction is eliminated using the sides m28 and 29, the wire 2 will be in a position perpendicular to the plane 23. Note that 32 is an insulator.

By the way, as is well known, the surface 3 of the wire 2
The surface 33 is partially peeled off during the manufacturing process, and fine particles (hereinafter referred to as dust) 34 of several micrometers to several + micrometers in size, such as dust in the air, are attached to the surface 33. If the wire 2 with such dust 34 attached to it is used, for example, conduction failure may occur during processing, or the guide 10, which has a margin of only a few micrometers compared to the diameter of the wire 2, may become clogged, causing the feeding of the wire 2 to become difficult. As the resistance increases, the tension of the wire 2 described above fluctuates, which not only makes it impossible to perform stable machining, but also sometimes breaks the wire 2, making it impossible to continue machining.

For this reason, there is a device as shown in Japanese Utility Model Application Publication No. 57-126936, which will be explained with reference to FIGS. 6 and 7.

A pair of creases 35 are placed on both sides of the wire 2 and are made of an elastic material such as felt.
6, the wire 2 comes into contact with almost the entire circumference of the wire 2, and the dust 34 attached to the ic[i33 as the wire 2 is fed out is removed. However, if the contact surface between the cleaner 35 and the wire 2 is always the same, the removed dust 34 will accumulate on the contact surface of the cleaner 35, and the ability of the cleaner 35 to remove the dust 34 will gradually decrease. Therefore, by holding the center of the cleaner 35 by a shaft 37 and rotating it as the wire 2 is fed out, the contact surface with the wire 2 is widened and the cleaner 35 can be used for a long time. In addition, 38 is a washer % 39JL, 39b is a pack plate, and 40 is a bolt.

[Problem that the invention seeks to solve]

By the way, in such a conventional device, there is no suitable method for detecting that the ability of the cleaner 35 to remove dust 34 has decreased, so it is necessary to use it until the above-mentioned trouble occurs or to disconnect the wire 2. It was replaced every time a certain amount was used.

However, if it is used until the above-mentioned trouble occurs, in addition to replacing the cleaner 35, cleaning the guide 10, etc.
Not only does the work such as resetting the wire 2 increase, but the processing accuracy also decreases. Further, even if the wire 2 is replaced every time a certain amount is used, if the dust removal ability of the cleaner 35 decreases and the dust 34 remains on the surface 33, the above-mentioned work to make the wire 2 perpendicular to the surface 23 is necessary. An error occurs in Therefore, for example, when performing the same processing on multiple workpieces 9, the work to make the wire 2 perpendicular to the surface 23 is performed every time the workpieces 9 are replaced, so even if the top and bottom surfaces of each workpiece 9 are Even if they are completely parallel, the same result cannot be obtained due to the above-mentioned error, and so-called processing reproducibility deteriorates.

Therefore, especially in machining that requires precision, the cleaner 35
There was a problem in that the T- must be replaced, which was troublesome.

[Means for solving problems]

This invention is intended to solve the above-mentioned problems, and its contents will be explained below using FIG. 1 corresponding to an embodiment.

A nozzle 50 arranged near the feeding path of the wire 2 from the bobbin 1 to the guide 10 has a hole 52 inside through which water 51 passes, one of the holes 52 is connected to a pump 53, and the other is connected to a pump 53. It is arranged so as to face the wire 2.

Further, 70 is a heater.

[For production]

Water 51 is pressurized by the pump 53 and spouted from the large 52.
impinges on the opposing surface 33 and removes any adhering dirt 34. Subsequently, the water 51 remaining on the surface 33 is evaporated by the heater 70, and the surface 33 is dried.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Components that are the same as those in FIGS. 4 to 7 are designated by the same reference numerals.

The wire 2 wound around the bobbin 1 is wound on reels 3, 4, and reels 54, 55, 5 provided between reel 4 and reel 5.
6 and the reel 5, and then sent to the guided O. 5
7 is a water tank provided in the column 16, and the wire 2 passes through the water 51 by reels 55 and 56. One of the openings of the hole 52 inside the nozzle 50 mounted on the column 16 faces the wire 2, and the other opening is connected to the tank 61 via the pump 53 by a pipe 59.6 ().

Further, the hole 62 in the bottom of the water tank 57 is connected to the tank 61 via the pulp 65 by pipes 63 and 64. 66
is a filter provided in the tank 61, and 70 is a heater. The operation will be explained below.

The water 51 in the tank 61 is sucked up by the pump 53 through the piping 60, is pressurized, and is passed through the piping 59 through the hole 52.
The dust 34 is ejected from the surface and collides with the opposing wire 2 to remove the dust 34 adhering to the surface 33. The water 51 spouted into the water tank 57 flows from the hole 62 to the pipe 6 along with the garbage 34.
3. The pulp is collected into the tank 61 via the pulp 65 and piping 64, and the dust 34 is removed by the filter 66, and the pulp is used again.

The pulp 65 controls the water level 67 in the water tank 57 to always be higher than the water 51 spouting position of the nozzle 50, and prevents the water 51 that collides with the wire 2 from scattering.

With the water 51 being spouted from the nozzle 50, when the wires 2 arranged opposite to each other are sent out, the dust 3 on the surface 33 is
4 are removed consecutively.

Note that the center position of the hole 52 only needs to be at the center position of the hollow wire 2, and does not need to be exactly aligned.

As described above, the dirt 34 is removed, but the remaining water 51 still adheres to the surface 33 that has left the water surface 67. surface 33
If the water 51 attached to the wire drips into the feeding path of the wire 2, the device becomes dirty.

Further, for safety reasons, the column 16 is insulated from the wire 2 to which a high voltage is applied during processing, but there is a risk that the water 51 described above may cause insulation failure.

Therefore, the water 51 remaining on the surface 33 of the wire 2 exiting the water surface 67 is removed by the heater 70.

FIG. 3 shows another embodiment. A nozzle 71 blows out dry air or warm air from an opening facing the wire 2 to remove water 51 remaining on the surface 33.

Although not particularly shown in the drawings, it goes without saying that the wire 2 may be energized to evaporate the moisture 5 through resistance heat generation.

〔Effect of the invention〕

As described above, the present invention removes dust adhering to the wire surface by jetting water, and at this time, removes the residual moisture on the surface using a drying device, so unlike conventional cleaners, the present invention removes dust adhering to the wire surface. There is no reduction in dust removal ability caused by this process, and a wire with a consistently clean surface can be obtained.

Therefore, there is no wire feeding trouble caused by dust adhering to the wire, and stable cutting can be achieved. Furthermore, since it is possible to prevent errors caused by dust in the pre-processing work of making the wire perpendicular to the table, it is possible to perform processing with excellent shape reproducibility.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a front view showing one embodiment of the present invention.
FIG. 3 is a front view showing another embodiment, and FIGS. 4 to 7 are views showing a conventional example. 1... Bobbin, 2... Wire, 0... Work, 10... Guide, 50... Nozzle,
51...Water, 70...Heater, 71...Nozzle. ,,/1. , to H

Claims (1)

[Claims] 1. A wire electrical discharge machine that processes a workpiece while feeding out an electrode wire, characterized in that the wire feeding path from the wire supplying bobbin to the workpiece is equipped with a water spouting device and a drying device. Electric discharge machine.