JPS5914115Y2 - Wire electrode extraction device for wire cut electrical discharge machining equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire electrode drawing device for a wire-cut electrical discharge machining device.

A wire-cut electrical discharge machining apparatus is provided with a wire electrode drawing device for drawing out the wire electrode from a delivery drum or the like, applying a desired tension to the wire electrode, and using the wire electrode for electrical discharge machining.

Conventional wire electrode drawing devices of this type include a plurality of rollers that sequentially contact and roll, and the wire electrode passes through the contact portions between the rollers in sequence, and at least between the contact portions, the roller surface There is a device configured to feed the wire electrode in close contact with the wire electrode, and the present invention relates to an improvement of this type of wire electrode drawing device.

When machining the center of a workpiece using a wire-cut electrical discharge machining device, for example, after machining of the - workpiece is completed, when machining another workpiece, To do this, it is necessary to cut the wire electrode, remove the workpiece, and then reset the wire electrode to the predetermined position of the wire electrode pull-out device before restarting wire cut electrical discharge machining. It took a lot of effort to reset the wire electrodes on the device.

That is, in the conventional apparatus, the setting of the wire electrode was performed manually.

One of them is to keep each roller of the pull-out device rotating.
The operation of inserting a wire electrode into the contact area between the rollers, catching the drawn-out wire electrode by hand, and inserting it into the contact area between the next rollers is repeated in sequence. After temporarily stopping the rotation of each roller, and moving one roller f'l in a direction perpendicular to the axis to separate it from the other roller, and inserting a wire electrode into the gap between the rollers, Each roller was brought into contact and rotated again.

However, this type of method is time-consuming and inconvenient.

The present invention was developed based on the above-mentioned viewpoint, and its purpose is to provide extremely convenient wire-cut electrical discharge machining in which wire electrodes are automatically set using an extremely simple configuration. An object of the present invention is to provide a wire electrode extraction device for a device.

Therefore, the gist of the present invention is that, in the above-mentioned wire electrode drawing device, in order to automatically set the wire electrode, the roller surface is opposed to the roller surface with a small gap therebetween, and An arc-shaped fixed guide is provided, one end of which lightly contacts the surface of the mating roller near the contact portion of each roller, and has a wire electrode passage groove on the inside having a tapered groove wall surface with an enlarged entrance. It is.

The details of the present invention will be explained below with reference to the drawings.

Fig. 1 is an explanatory diagram showing one embodiment of the wire electrode drawing device according to the present invention, Fig. 2 is a side sectional view of the fixed guide (cross section A-A in Fig. 1), and Fig. 3 is an explanatory diagram showing an embodiment of the wire electrode drawing device according to the present invention. Enlarged view of part B, No. 4
The figure is a front view of the fixed guide.

In the figure, 1 is a workpiece, 2 is a wire electrode, 3 is a roller 4,
5 and 6 and a fixed guide 7.8, a drawing device for the wire electrode 2, and 9 a guide for guiding the wire electrode 2 to the drawing electrode 3 to the contact area between the roller (pinch roller) 4 and the roller (capstan roller) 5. , 10 is a support for the fixed guide 7, 1
1 and 12 are guide rollers and power supply rollers, 13 and 14
15 is the supply drum of the wire electrode 2 and the collection container thereof;
are a pair of sliding contact guides forming the processed portion of the wire electrode 2;
16 is a brake roller for applying tension.

The workpiece 1 is supported by a cross table (not shown), and a processing feed is applied along a desired contour line at a desired speed by a numerical control device (also not shown).

Further, the wire electrode 2 is pulled out from the supply drum 13 by the tension of the drawing device 3, passes between the guide roller 11 and the power supply roller 12, passes between the sliding guides 15 and 15 of the processing section, and then passes through the drawing device 3. It reaches the contact area between the rollers 4 and 5 and the contact area between the rollers 5 and 6, and is sent to the collection container 14 via the rollers 6 and collected.

A machining pulse is applied between the workpiece 1 and the wire electrode 2 via the power supply roller 12 by a known desired control circuit, and a machining fluid supply nozzle (not shown) supplies, for example, pure water. Machining fluid such as water is injected at high speed to perform the desired wire cut electric discharge machining.

The rollers 4, 5, and 6 constituting the pull-out device 3 are sequentially brought into contact with each other at a desired speed by at least one roller 5, for example, a DC motor (not shown).

That is, the rollers 4 and 5 and the rollers 5 and 6 are configured so that their respective roller surfaces are in contact with each other, and as a result, the rollers 4 and 5 and the rollers 5 and 6
and are rotated in opposite directions.

The fixed guide 7 is fixed to a machine base (not shown) by a support 10, and is configured to face the roller 5 and the roller surface with a small gap therebetween.

The cross section of the fixed guide 7 is as shown in FIG. A semicircular groove 7-2 is provided as small as possible or smaller than that.

Although there may be a small gap between the opposing surface 7-1 other than the groove 7-2 and the roller surface 5-1 due to the insertion of the wire electrode 2, they are usually in sliding contact with each other.

Further, one end portion of the fixed guide is configured as shown in FIGS. 3 and 4, and the ridge line ab of one end surface abcd of the fixed guide 7 is in slight contact with the roller surface of the roller 4.

This light contact is made with the roller surface 5-1.
This is to accurately guide the wire electrode 2 between the opposite surface 7-1 of the fixed guide 7 and the opposite surface 7-1 of the fixed guide 7.

Further, the entrance portion of the passage groove 72 for the wire electrode 2 of the fixed guide 7 is a tapered groove as shown in FIG.
The groove wall surface 7-5 is gradually reduced from the artificial surface 7-3 to the predetermined surface 7-4 to form a semicircular groove having a constant radius.

The reason why the entrance portion of the fixed guide 7 is tapered in this way is to ensure that the wire electrode 2 is smoothly guided to the passage groove 72 and moved along the roller surface 5-1.

Note that the above also applies to the relationship between the rollers 6 and the fixed guides 8.

In order to start moving the wire electrode 2 by the drawing device 3, the tip of the wire electrode 2 may be inserted into the guide 9 and sandwiched between the rollers 4 and 5.
passes through the contact portion between the rollers 4 and 5, passes from the enlarged tapered groove wall surface 7-5 at the entrance portion of the fixed guide 7, and passes between the wire electrode passage groove 7-2 and the roller surface 5; Furthermore, it passes through the contact area between the rollers 5 and 6 and between the fixed guide 8 and the roller surface of the rollers 6, and is collected into the collection container 14.

That is, the wire electrode 2 is manually connected to the brake roller 1.
After passing through the hole of the workpiece 1 through the 6 parts, the power supply and guide rollers 11 and 12 parts, and the sliding guide 15, the brake roller 16 and the rollers 4, 5, and '6 of the drawing device 3 are rotated, etc. When the tip of the wire electrode 2 is inserted into the hole of the guide 9 in the operating state, the tensioning work of the wire electrode 2 is completed. This is a wire electrode tensioning or drawing device that is effective when employed in the case of configuration, etc.

It is recommended that the guide 8 also have a tapered entrance so that the wire electrode 2 can be guided reliably.

Since the present invention is constructed as described above, according to the present invention,
It is possible to provide an extremely convenient wire electrode drawing device with a simple structure.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the number and dimensions of the rollers constituting the pull-out device can be freely changed depending on the scale of the wire-cut electrical discharge machining device, and The surface of the guide facing the roller surface does not necessarily have to have a semicircular groove, but may have a V-shaped groove.

In addition, especially in a multi-head wire-cut electrical discharge machining device, for example, the machining section and the wire electrode tensioning section shown in FIG. By adopting and installing the wire electrode 2 in a container that can be collected 14 times, the workability of tensioning the wire electrode 2 is significantly improved and extremely convenient.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the wire electrode drawing device according to the present invention, and FIG. 2 is a side sectional view of the fixed guide (the first
3 is an enlarged view of section B in FIG. 1, and FIG. 4 is a front view of the fixed guide. 1... Workpiece, 2... Wire electrode,
3... Pull-out device, 4, 5 and 6... Roller, 7, 8... Fixed guide, 10...
・Support, 11... Guide roller, 12...
...Power supply roller, 13... Delivery drum, 14.
...Recovery drum.

Claims (1)

[Scope of utility model registration request] The wire electrode is cut from a plurality of rollers that sequentially roll in contact with each other, and is configured such that the wire electrode passes sequentially through the contact portions between the rollers and is fed in close contact with the roller surface at least between the contact portions. In the wire electrode drawing device for electrical discharge machining equipment, the wire electrode faces the roller surface in close contact with a small gap therebetween, and one end of the wire electrode is brought into light contact with the surface of the mating roller near the contact portion, and the roller The above-mentioned wire electrode drawing device for a wire-cut electrical discharge machining apparatus, characterized in that an arcuate fixing force field is provided on opposing surfaces thereof, the wire electrode passing groove having a tapered groove wall surface with an enlarged entrance.