JP2667475B2 - Method and apparatus for correcting parallelism of wire electric discharge machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a method for correcting parallelism of a wire electric discharge machine for correcting the parallelism of a workpiece placed on a table in the wire electric discharge machine. And equipment.

[Prior Art] A wire electric discharge machine consists of a wire electrode and a work piece.
This is a device that arbitrarily processes a workpiece by generating a discharge between the two and moving the two relatively. The outline of such a wire electric discharge machine will be described with reference to the drawings.

FIG. 3 is a side view of the wire electric discharge machine. In the figure, 1
Is a bead, 2 is a column provided on the bead 1 so as to be movable in the X-axis direction shown by an arrow X in the figure, and 3 is a Y-axis direction shown on the bead 1 by an arrow Y in the figure (with respect to the X-axis direction). A table provided so as to be movable in a vertical direction), and 4 is a table 3
A mounting base fixed on the top. 5 is a wire electrode, 6 is a bobbin around which the wire electrode 5 is wound, 7 and 8 are rollers for guiding the wire electrode 5 drawn out from the bobbin 6, and 9 is a drawing roller for drawing out the wire electrode 5. Reference numerals 10 and 11 denote guides for positioning the wire electrodes 5 provided to face the X axis and the Y axis in the vertical direction. 12 is Guide 10
And the guide 10 is moved in the U-axis direction parallel to the X-axis and the V-axis direction parallel to the Y-axis. Reference numeral 13 is a work fixed to the mount 4, and 14 is a probe for measuring the parallelism of the work 13 with respect to the X axis and the Y axis.

When machining the work 13, first, use the probe 14 to measure X.
The workpiece 13 is mounted on the mounting table 4 so as to be parallel to the axis and the Y axis. Then, the wire electrode 5 is inserted into a through hole for processing previously formed in the workpiece 13, and a pull-out roller 9 is inserted through a roller 8. Withdraw. In this state, the wire electrode 5 is positioned by the guides 10 and 11 perpendicularly to the X axis and the Y axis, and the work piece 13 is fixed in parallel to the X axis and the Y axis. By applying a predetermined voltage between the wire electrode 5 and the work 13, a discharge is generated between the two and the table 3 and the column 2 are relatively moved to perform the discharge machining of the work 13. The drive device 12 is used when the work 13 is tapered and the wire electrode 5 is inclined from the vertical direction.

[Problems to be solved by the invention]

The mounting of the work 13 in the wire electric discharge machine is as follows.
Since the wire electrode 5 is inserted and processed, the entire lower surface of the work 13 cannot be attached to the mounting base 4 in contact therewith. The attachment of the work 13 will be described with reference to the drawings.

FIG. 4 is a plan view of the mounting table and the work. In the figure,
4 is a mount and 13 is a work, which are the same as those shown in FIG. Reference numeral 16 denotes a holding plate for the work 13, and 17 denotes a bolt for fastening the holding plate 16 to the mounting table 4. The work 13 is attached to the mounting table 4 by pressing a portion irrelevant to processing (the end of the work 13 in the drawing) with a holding plate 16 and tightening with a bolt 17. Since only the end of the work 13 is clamped by the mounting base 4, the wire electrode 5 can be inserted through the processed portion of the work 13. There is also a mounting method for mounting the work 13 at the corner of the mounting table 4 as shown by a broken line. In this case as well, the portion attached to the attachment base 4 is a portion not related to processing.

By the way, since the work 13 is mounted as described above only by fixing the ends, the work 13 is simply clamped by the holding plate 16 and the
It is not possible to mount the work 13 in parallel with the plane formed by the X axis and the Y axis by only tightening the work piece 17. In order to obtain the parallelism, while measuring the inclination angle of the work 13 with respect to the plane by the measuring element 14, the bolt 17 is loosened based on the inclination angle, and the adjustment of moving the work 13 and tightening the bolt 17 again is repeated. This adjustment is performed solely by the intuition of the operator, even an expert has several adjustments,
This took a lot of time and effort.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, to reduce the labor and time required for mounting a workpiece, and to thereby greatly simplify the setup of machining, thereby improving the parallelism correction of a wire electric discharge machine. A method and apparatus are provided.

[Means for solving the problem]

In order to achieve the above object, a first aspect of the present invention provides a table having a plane including a first axis and a second axis orthogonal thereto, on which a workpiece is placed, and a guide for a wire electrode. In the parallelism correction method of a wire electric discharge machine having a wire guide, the workpiece is placed on the table, and the parallelism of the placed workpiece with respect to the plane is measured. According to the parallelism, the wire guide is displaced so that the wire electrode is perpendicular to the workpiece.

According to a second aspect of the present invention, there is provided a wire discharger including a table having a plane including a first axis and a second axis orthogonal to the first axis, the table on which a workpiece is placed, and a wire guide for guiding a wire electrode. In the parallelism correction device of the processing machine, a measuring means for measuring the parallelism of the workpiece mounted on the table with respect to the plane, and the wire for the workpiece according to the measured parallelism A wire guide positioning means for driving the wire guide so that the electrode is vertical, and a correction means for correcting a processing command value based on the parallelism measured by the measurement means are provided.

(Operation)

In the first aspect of the invention, in the machining setup of the wire electric discharge machine, the workpiece is attached to the table and the parallelism of the workpiece is measured. Next, the wire guide is displaced based on the measured parallelism without adjusting the parallelism of the workpiece so that the wire electrode is perpendicular to the workpiece.

In the second invention, the same operation as described above is performed by the measuring means and the wire guide positioning means, and at the time of actual processing, the processing command value is corrected according to the parallelism by the correcting means.

〔Example〕

 Hereinafter, the present invention will be described with reference to the illustrated embodiments.

1 and 2 are explanatory views for explaining the principle of a parallelism correction method and apparatus for a wire electric discharge machine according to an embodiment of the present invention. In each figure, the same parts as those shown in FIG. In the setup for machining with the wire electric discharge machine, first, the work 13 is clamped and fixed to the mounting base 4 as shown in FIG. Next, the inclination angle θ of the work 13 with respect to the plane A parallel to the plane formed by the X axis and the Y axis is measured by the tracing stylus 14. Note that this inclination angle is extremely exaggerated in FIGS. 1 and 2. Then, the tilt angle θ is input to a control device (not shown), and the control device drives the driving device 12 via a wire guide positioning means provided therein, and the wire guide 10 is moved by a solid line shown in FIG. From the position to the dashed line position. The displacement amount of this displacement is the wire electrode 5 after displacement (indicated by a chain line).
Is a displacement amount perpendicular to the work 13, that is, a displacement amount by which the wire electrode 5 is displaced by the inclination angle θ. Here, the driving device 12 is usually a wire guide in units of 1 μm.
10 can be displaced in the U-axis and V-axis directions, the positioning means calculates how much the wire guide 10 should be displaced to displace the wire electrode 5 by the angle θ. The operation of outputting the result to the drive device 12 is performed. By the above means, the work 13 and the wire electrode 5 can be relatively perpendicular to each other as in the case where the work 13 is attached to the mount 4 with the parallelism adjusted.

In this way, the work 13 is fixed to the mounting table without considering the parallelism, and the wire guide 10
Is tilted so that the work 13 and the wire electrode 5 are perpendicular to each other, so that the mounting of the work 13 does not require any adjustment to its parallelism, and the time and effort for adjustment are reduced. It can be omitted, and the machining setup can be greatly simplified.

On the other hand, in a usual wire electric discharge machine, the moving distance of the column 2 and the table 3 is programmed in advance in a predetermined storage means, for example, a tape, a magnetic disk, or the like according to a desired machining shape of the work 13. The control device is configured to sequentially read the moving distance stored in the storage means and output this to the driving mechanism of the column 2 and the table 3 as a command signal. By the way, when the work 13 and the wire electrode 5 are inclined by the angle θ with respect to the plane A as in the above-described means, the column 2 and the table 3 move along the plane A according to the command signal. The relative movement distance to the work 13 is shorter than the distance given by the command signal. This is shown in FIG.

FIG. 2 shows a case where only the wire electrode 5, that is, only the column 2 is moved in the X-axis direction with respect to the work 13. In the figure, x indicates a command value for the column 2, and x ′ indicates a vertical movement distance of the wire electrode 5 when the column 2 moves by the command value x. The moving distance x ′ is the actual moving distance of the wire electrode 5 with respect to the work 13. By the way, since the desired movement distance of the wire electrode 5 with respect to the work 13 is the command value x, the actual movement distance x ′ is x ′ = x cos θ.
And becomes shorter than the expected moving distance x. In this embodiment, a correction means for correcting this is provided in the control device. The correction means, when the movement distance programmed in the storage means is read, inputs this movement distance, and performs an operation of multiplying this by (1 / cos θ),
The value obtained by this calculation is output as a new command value. By providing such correction means, the work 13
Can be accurately machined into the desired shape.

In the description of the above embodiment, an example in which only one wire guide is displaced has been described. However, in a machine in which both wire guides are displaced, a desired angle can be obtained by displacing one or both wire guides. Obviously you can get it. Also, at the time of taper processing, it is natural that the correction is also made for the movement of the V axis.

〔The invention's effect〕

As described above, in the present invention, the work piece is attached,
The parallelism was measured, and the wire guide was moved so that the wire electrode was perpendicular to the workpiece according to the measured value, so there was no need to adjust the mounting of the workpiece, making adjustments The labor and time required for the process can be saved, and the processing setup can be greatly simplified.
Further, at the time of processing, a corrector is provided in the control device so that the relative movement distance between the workpiece and the wire electrode matches the specified value, so that accurate processing can be performed.

[Brief description of the drawings]

1 and 2 are explanatory views for explaining the principle of a parallelism correcting method and apparatus of a wire electric discharge machine according to an embodiment of the present invention, FIG. 3 is a side view of the wire electric discharge machine, and FIG. It is a top view of a work and its mounting stand. 4 ... Mounting base, 5 ... Wire electrode, 10,11 ... Wire guide, 13 ... Workpiece, 14 ... Sensor.

Claims (2)

(57) [Claims] 1. A wire electric discharge machine, comprising: a table having a plane formed by a first axis and a second axis orthogonal to the first axis and having a table on which a workpiece is placed, and a wire guide for guiding a wire electrode. In the parallelism correction method, the workpiece is placed on the table, and the parallelism of the placed workpiece with respect to the plane is measured. With respect to the workpiece according to the measured parallelism, Wherein the wire guide is displaced so that the wire electrode becomes vertical. 2. A wire electric discharge machine comprising: a table having a plane formed by a first axis and a second axis perpendicular to the first axis, the table for mounting a workpiece, and a wire guide for guiding a wire electrode. In the parallelism correction device, measuring means for measuring the parallelism of the workpiece mounted on the table with respect to the plane, wherein the wire electrode is perpendicular to the workpiece according to the measured parallelism. A wire electric discharge machine, comprising: a wire guide positioning means for driving the wire guide so as to provide a correction means for correcting a machining command value based on the parallelism measured by the measurement means. Parallelism correction device.