JPH0683932B2 - Wire electric discharge machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine, and more particularly to improvement of automatic feeding of wire electrodes.

[Prior Art] In a wire electric discharge machine, a wire electrode continuously supplied and a workpiece are opposed to each other through a minute gap, and a pulsed discharge is repeatedly generated while supplying a machining liquid to the minute gap. It is for processing. For the wire that will be the discharge electrode,
Since a thin metal wire of 0.1 mm or less is often used, this ultra-fine wire electrode is continuously fed to the processed part, and the processed wire is collected and does not contribute to the processing again. , It is a so-called consumable electrode. Second
FIG. 1 is a configuration diagram showing a wire electrode feeding portion of a conventional wire electric discharge machine, in which (1) is a wire electrode,
(2) is a support die for supporting the wire electrode (1),
(3) is a drive motor in which the drive roller (4) is attached to the rotary shaft, (5) is a pinch roller that presses the wire electrode (1) against the drive roller (4), and (6) is a pipe support (7) It is a guide pipe for guiding the wire electrode (1) fixed to, and has a supporting die (6a) for supporting the wire electrode (1) at the lower end portion. In the figure, the arrow indicates the feeding direction of the wire electrode (1).

Next, the feeding operation of the wire electrode (1) will be described.

In wire electric discharge machining, the wire electrode (1) is generally supplied automatically, but prior to the machining,
It is necessary to manually feed the wire electrode (1) to a predetermined position. In this case, first, the wire electrode (1) is inserted into the central portion of the support die (2) so as to penetrate therethrough, and then sandwiched between the drive roller (4) and the pinch roller (5). At this time, the pinch roller (5) pressed against the drive roller (4) by the spring or the like is in the open state in advance as indicated by the broken line in the figure. Then, the wire electrode (1) passing between the rollers (4) and (5) is inserted into the guide pipe (6), and further fed into the guide pipe (6) through the support die (6a). deep. In this state, if the pinch roller (5) is returned to its original position, the wire electrode (1) is sandwiched between the drive roller (4) and the pinch roller (5), and the wire electrode (1) is automatically fed in the wire electric discharge machining. The preparation for salary will be completed.

Then, when the drive roller (4) is rotationally driven by the drive motor (3), the pinch roller (5) pressed by the drive roller (4) with a constant force also rotates accordingly, so that the wire electrode ( 1) is fed in the direction of the arrow, and is eventually recovered via a workpiece and a winding means (not shown). By this series of operations, the wire electrode (1) is automatically supplied.

By the way, the clearance between the wire electrode (1) and the center of each supporting die (2), (6a) is 0.05 to 0.1 m.
Although the diameter is as small as m, the inner diameter of the guide pipe (6) is 1
Since it is about 2 mm, it has a relatively large clearance as compared with the support die (2).

[Problems to be solved by the invention]

Since the conventional wire electric discharge machine is configured as described above, the support point of the wire electrode (1) is
Although there are two points between (5) and the support die (6a) of the guide pipe (6), the wire electrode (1) is free between the two, that is, in the guide pipe (6). Moreover, since there is a considerable span between the two, when the wire electrode (1) is automatically fed in this state, the wire electrode (1) is guided by the guide pipe (6) as shown in the side view of FIG. The wire electrode (1) sticks out from the guide pipe (1) by contacting with the inner wall of the wire and meandering (solid line in the figure), or by the respective rollers (4) and (5) moving axially during rotation. (Dashed line in the figure). As a result, the wire electrode (1) is not normally fed, and it becomes necessary to set the wire electrode (1) again. Therefore, there is a problem that workability is deteriorated.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a wire electric discharge machine capable of accurately feeding a wire electrode automatically.

[Means for solving problems]

A support die having a through hole for a wire electrode having a fine clearance with respect to the wire electrode according to the present invention,
It is arranged such that one end thereof is located immediately below the pair of rollers and the other end thereof is located at the inlet of the guide pipe.

[Action]

In the present invention, the wire electrode is fed by the rotation of the pair of rollers, and the fed wire electrode is guided to the guide pipe by the support die.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, (1) to (6) and (6a) are the same as the conventional ones, and therefore their explanations are omitted. Reference numeral (7a) is a pipe support table provided below the rollers (4) and (5) and provided with a guide pipe (6) and a lower support die (8). The lower support die (8) has a through hole for the wire electrode (1) made of, for example, diamond or sapphire. Also, as is clear from the figure, the support dies (2), the lower support dies (8) and the guide pipes (6) provided on the upper portions of the rollers (4) and (5) have their centers aligned with each other. It is provided. That is, the wire electrode (1) is provided between the support die (2) above the rollers (4) and (5) and the support die (6a) of the guide pipe (6).
Is to be supported in a straight line.

Next, the operation will be described. In wire electric discharge machining, the wire electrode (1) is automatically supplied, but for that purpose, it is necessary to guide the wire electrode (1) to a predetermined position in advance. For this purpose, first, the pinch roller (5) pressed by the drive roller (4) is opened as shown by the broken line in the figure. In this state, the wire electrode (1) is inserted into the center of the support die (2) at the upper part of the roller to penetrate the wire, and then the lower support die provided on the pipe support (7a) via the drive roller (4). It is inserted into the center of (8) and further fed, and the support die (6a) provided at the lower end of the guide pipe (6) is passed through and guided to a predetermined position.

When the released pinch roller (5) is returned to its original position, the wire electrode (1) is sandwiched between the drive roller (4) and the pinch roller (5), whereby the wire electrode (1) ), The preparation for automatic supply is completed.

After that, the wire electrode (1) is automatically supplied in the same manner as in the conventional case. However, in the above configuration, the wire electrode (1) is directly below the rollers (4) and (5) and close to the inlet of the guide pipe (6). The wire electrode (1) sent by the rotation of each roller (4), (5) by providing the support die (8) is fed from the lower support die (8) to the center of the guide pipe (6). Will be. This is because the clearance between the wire electrode (1) penetrating portion of the lower support die (8) and the wire electrode (1) is minute as described above, and therefore the wire electrode (1) does not move back and forth and left and right. This is because. As a result, the automatic supply of the wire electrode (1) is smoothly performed. In the above embodiment, the lower support die (8) is provided on the pipe support base (7a). ),
(5) If it is directly below and in the vicinity of the inlet of the guide pipe (6), the same effect as that of the above embodiment can be obtained.

By the way, the present invention is extremely effective in automatically supplying wire electrodes having a diameter of 0.1 mm or less, but it goes without saying that the same effect can be obtained even with wire electrodes having a size larger than that.

〔The invention's effect〕

As described above, according to the present invention, a support die having a through hole for a wire electrode having a fine clearance with respect to the wire electrode is provided, one end of which is located immediately below the pair of rollers and the other end of which is located. Since the portion is arranged so as to be located at the inlet of the guide pipe, the wire electrode is fed to the center of the guide pipe, and the wire electrode can be reliably fed automatically, and an excellent wire electric discharge machine can be obtained. effective.

[Brief description of drawings]

FIG. 1 is a detailed view of a wire electrode feed section of a wire electric discharge machine according to an embodiment of the present invention, FIG. 2 is a detailed view of a wire electrode feed section of a conventional apparatus, and FIG. 3 is a side sectional view of FIG. It is a figure. In the figure, (1) is a wire electrode, (2) is a support die, (4) is a drive roller, (5) is a pinch roller,
(6) is a guide pipe, and (8) is a lower support die. In the drawings, the same reference numerals indicate the same parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Suzuki 5-1-1 Yataminami, Higashi-ku, Nagoya-shi, Aichi Mitsubishi Electric Corporation Nagoya Works (56) Reference JP 62-130129 (JP, A) JP-A-59-156626 (JP, A)

Claims (1)

[Claims] 1. A wire electric discharge machine comprising a pair of rollers for feeding a wire electrode while sandwiching the wire electrode, and a guide pipe for automatically feeding the wire electrode provided below the pair of rollers for guiding the wire electrode fed out. In the apparatus, a support die having a through hole for the wire electrode having a minute clearance with respect to the wire electrode is provided, one end of which is located immediately below the pair of rollers and the other end of which is an inlet of the guide pipe. A wire electric discharge machine characterized in that it is arranged so as to be located in a section.