JPS63134124A - Wire electric discharge machine - Google Patents

Abstract

PURPOSE:To improve machining accuracy, by detecting positions of a workpiece and a pallet by a contact detecting means to be compared with the preceding time data and correcting an NC machining program so as to reduce the time for mounting the workpiece to the pallet and an error by the worker. CONSTITUTION:Coordinates on two straight lines, containing original points of a workpiece 7 and a pallet 8, are detected by a contact detecting means 20 and stored in memory in a storing means 21, and a machine, in which a position arithmetic means 22 calculates coordinates of a reference point and a tilt of a table 10 for its X-axis, corrects a coordinate value of an NC machining program in a correcting means 25 to be stored in a memory means 23. In case of cutoff machining, after the workpiece 7 and the pallet 8 are mounted to a surface plate 9 by an automatic workpiece exchanger 15, the NC machining program is corrected by a similar procedure. When the workpiece 7 is in finishing cutting off the reference point already, the machine, obtaining only the reference point of the pallet 8 and its tilt, obtains the position of the workpiece by adding a position data, stored in memory in the memory means 23 before machining, and an error, compared in a comparing arithmetic means, to the position data of the workpiece 7 stored in the memory means 23.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wire electrical discharge machining apparatus having a function of automatically exchanging a workpiece, and in particular to correction of the position of a workpiece.

[Conventional technology]

FIG. 3 is a diagram showing a conventional device, with a diagram of multiple ζ3pr (1
)1. f 7 E Yt! supply bohin, (2) i, t
Wire 9g, (3) and (4) are wire pulleys that change the running direction of the wire pole (2), and (5) is a wire electrode (2).
) is a pinch roller that runs, and (6) is a collection box that stores used wire electrodes. (7) is the workpiece, (8)
(9) is a machining surface plate that fixes the pallet (8) to the ringing tape / l / shout, α old ball screw, @ is the motor for driving the i4 table, α
3 is a rotary encoder that detects the rotational position of the motor (2), and when the motor O'5 is transmitted by the command of the NO unit of σ, the transmission is detected by the rotary encoder αJ and NC (*fFZQ4). The 111 m tape MQO moves by a predetermined distance.

05 is an automatic workpiece changer, and at the end of machining, NO device 0
Workpiece (7) according to the command of 4)! ! The pallet (
8) is collected, and a pallet on which the next workpiece is placed is supplied to the machining surface plate (9) fζ. αG is a machining Ti, which generates a discharge by supplying a pulse current between the wire electrode (2) and the workpiece (7). (7) can be cut along a desired trajectory.

Fig. 4 is a diagram showing the method of positioning the pallet (8) on the processing surface plate (9), (G) is the positioning bin provided with the processing surface plate (93+ζ), and the automatic workpiece changer αG is With the pallet (8) with the workpiece alted pressed against the unpositioned bin (g), the pallet 9) (8) is fixed at the machining setting fA (9) using a clamper. However, the workpiece (7) is precisely fixed in advance at a predetermined position on the pallet (8).

Normally, wire Wt machining is rarely completed in one machining, and after rough machining is performed under the high-energy machining conditions, finishing machining is performed several times under low Jj machining conditions. In addition, if a cut off of the workpiece (7) occurs, there is a risk of breaking a part of the machine, so after machining multiple pieces unattended, leave an uncut part to prevent the cut off. , the uncut parts are processed by a man, and then removed by hand. Therefore, in the case of a wire electric discharge machining machine with an automatic workpiece changer, uncut parts are provided for all workpieces, and after the first machining is performed unmanned, all workpieces are cut off by a man. The pallet (8) is changed many times and the finishing process is carried out again after 2m.

Therefore, it takes a long time to set the positions of the workpiece (7) and pallet (8) with respect to the machine table αO.
It is undeniable that highly accurate settings cannot be made due to the need for human intervention.

[Problems to be solved by the invention] Since the conventional wire and W city processing equipment with an automatic workpiece changer is configured as described above, the workpieces can be placed on the pallet at a predetermined position n. It has to be fixed accurately, which is time consuming, and there are also errors caused by the manufacturer and positioning errors of the barret due to the bottle, and there are problems such as the inability to process the bolts. Ta.

This invention was made to solve the above-mentioned problems, and it detects and stores the positions of the workpiece and pallet, and combines the current position detection data of the workpiece and pallet with the previous position detection data. The purpose of the present invention is to obtain a wire processing device that can compare the data and correct the shift of the workpiece on the pallet.

[Means for solving problems]

The wire electrical discharge machining apparatus according to the present invention stores a plurality of outputs of the contact detection means in the storage means via the NC device, calculates the stored plurality of data with the position calculation means, and
The calculation results are input to the correction means, a plurality of outputs from the position calculation means are stored in the storage means, and the data on the number of furnaces is compared and calculated by the comparison calculation means and input to the correction means ζζ.

[for use]

In this invention, contact data f! of the workpiece and pallet detected by the contact detection means is used. - After inputting it into the NO device and converting it into each coordinate value, it is stored in the storage means, and based on the stored multiple coordinate values, it is applied to the workpiece and valley table. The position calculation means calculates the coordinates and the deviation of the mounting angle, and the correction means corrects the added program based on the calculation results. or,
When the origin of the workpiece disappears, the calculation results before and after the origin disappears by the position calculation means are stored in the storage means, and these stored data are compared by the comparison calculation means, and the comparison calculation is performed. Based on the results, the correction means 6ζ corrects the addition program.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawing number ζ.

1 and 3 indicate the same parts and their explanations will be omitted.

In Fig. 1, (to) the wire electrode (2) is connected to the workpiece (
7) and the pallet (August) When contact is made, contact detection means generates a signal and inputs it to NO device I, QlJ is the contact detection means signal is input to NC device (14) lζ and the first coordinate value storage means for storing a plurality of signals converted into n, and () is a storage means for storing a plurality of signals converted into n. Based on the coordinate values output from the storage means, the tape 7L/q (seating and mounting angle relative to 1) is attached to the comb of the workpiece (7) and the hivelet (8). □ is a position calculation means for calculating the deviation of , □ is a storage means for storing all the results calculated by the position calculation means, (c) is a comparison means for comparing the plurality of stored results output from the storage means, □ □□ is a correction means for correcting the added nib rim stored in the NC device 04 based on the output (ζ) of the position detection means or the comparison calculation means (c).

The missing number ζ operation will be explained.

FIG. 2 is a diagram when the workpiece (7) and valley J) (8) are attached at a certain angle and deviation with respect to the X-axis 6ζ of the machine table IIG. In the figure, the two-position line L+ and L2 of the workpiece (7) are the workpiece reference plane, and the diagonal angle appears, and the seat ring at the origin detects contact with each coordinate of A%B%C in the figure. From lζ detected at the device mouth, 2, 薇A,
I passing through B] It is calculated as the intersection point where the line L1 and the straight line L2 passing through one point C are perpendicular to each other. The angle can be calculated by calculating the difference ψ1 of the straight line L+ passing through 2.g, A, Bf!! with respect to X@.

Therefore, the position of the workpiece (7) relative to the machine tape 〃θoldζ can be specified from the origin OW of the workpiece (7) and the deviation ψl of the machine table αQ with respect to X@. Similarly, for pallet (8), the coordinates of the first power, gu, ○P and the troublesomeness of marking the can do.

Referring again to FIG. 1, as explained in FIG. 2, the position p calculation means calculates the workpiece (7) and the valley yt (81) from the coordinate values of several loincloths stored in the storage means 121 (ζ). Point coordinates and mechanical table αQ relative to the X axis ψ
1 and ψ2 are calculated 1, and the result is calculated by using the correction means to rotate the M target value of the NC nib program by an inclination angle ψ1 or ψ2 with respect to the 1# machine tape tvaaOX axis around the workpiece reference point. I love to use it to correct my hair,
The numbers attached to the workpiece (7) and the pallet (8) are also stored in the storage means of the trowel together with the numbers.

Next fζ, in the case of cutting off the uncut portion, the workpiece (7) and the bullet (8) are changed again to the automatic workpiece changer αυ
When the machining surface plate (9) is defeated from 1ζ, go up fζ using the same procedure as before the first machining, identify the position of the workpiece (7), meet the nail, and create the IQ C Kamini program. After correcting, cut off processing is performed.

Next, fζ, workpiece (7) and burr I for finishing machining.
Since the Eζ reference point W section may be cut off, the reference point 09 of the pallet (8) is cut off from the machine table θG.
Find only the slope ψI and ・Φ2 with X@, and calculate its 4E(
is stored in the first means (c). Then, compare the position data obtained before the first processing in the storage means 1μ (ζ memorize and escape ff) (3) with the position data obtained this time,
ξ and calculate the difference between the two. In addition, calculate the difference data before processing and add the position data lζ of the workpiece (7), which is written in x>xh. By doing this, the position I of the current workpiece (7) can be found, and as a result, the NC711] Ni log system can be corrected by the correction means in (4).

In the above embodiment, the storage means, the position calculation means,
Storage means @, comparison calculation means @ and tightening means (to) are NC
Although a groove ζ is provided outside the device, a similar function may be provided inside the NO device.

〔Effect of the invention〕

As described above, according to the present invention, the contact detection means detects the position of the workpiece and the bullet by comparing it with the previous data and corrects the Noh Loe program. Workpieces can be mounted on the stand in a short time,
In addition, it has the effect of being able to perform machining with flat precision without any errors caused by the operator.

[Brief explanation of the drawing]

FIG. 1 shows a wire electrical discharge machining apparatus according to an embodiment of the present invention. FIG. 3 is a diagram showing a conventional wire discharge machine, and FIG. 4 is a diagram showing a method for positioning a bullet on a processing surface plate. In the figure, (2) is a wire ttN, (7) is a workpiece,
(8) is batt, QG is machine table, 04 is NO device, ■ is contact detection means, circle is storage means, - is calculation means,
The bone is a storage means, the gradient is a comparison i'jT calculation means, and (to) is a correction means. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A wire electrical discharge machining apparatus having a function of automatically exchanging workpieces, a contact detection means for detecting a contact state between each of the workpiece and a pallet on which the workpiece is placed and a wire electrode; and the contact detection means. an NC device that converts the detection signal of the above into coordinate value data, a storage means for storing a plurality of the coordinate value data, and a machine table reference axis of the workpiece and pallet based on the plurality of coordinate value data stored in the storage means. a position calculation means for calculating the amount of deviation of the position relative to the position; a storage means for storing a plurality of calculation data calculated by the position calculation means; and a same workpiece among the plurality of pallet position data stored in the storage means. a comparison calculation means for comparing the two position data and adding the comparison deviation to the position data of the same workpiece stored in the storage means, and based on the calculation result of the position calculation means or the comparison calculation means, A wire electric discharge machining apparatus comprising: a correction means for outputting a signal for correcting the amount of positional deviation with respect to an NC machining program.