JPS58137528A - Wire cut discharge machining device - Google Patents

Abstract

PURPOSE:To automate a workpiece positioning work by measuring a slant angle between the datum level of a workpiece of wire cut discharge machining and that of a table, and conducting rotation of coordinates conversion by the slant angle for data of work shape. CONSTITUTION:The slant angle between datum levels 12a and 10a for a table 12 and a workpiece 10 is measured through putting a wire electrode 14 in contact with the workpiece 10. This slant angle measured by means of a slant angle measurement device 66 is sent to a control device 54 and rotary coordinates conversion by said angle for a work data inputted from a tape 62 in conducted by means of a rotation management device 64. Thus positioning of the workpiece can be automatically performed without changing the position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire-cut electric discharge machining apparatus, in particular, to apply a voltage between a workpiece and a wire electrode passing through the workpiece to generate a discharge between the two, and to move the wire electrode in the axial direction. The present invention relates to a wire-cut electrical discharge machining device that cuts the workpiece into a desired shape according to the electric discharge energy by relatively moving the workpiece and the wire electrode in the X-axis direction and the Y-axis direction while moving the workpiece. .

FIG. 1 is a configuration diagram showing the operating principle of a wire-cut electrical discharge machining device. The workpiece 1o is placed on the table 12. In order to penetrate the wire electrode 14 in this workpiece, a large diameter hole 16 is previously formed in the wire electrode jp using a drill or the like. The workpiece 10 and the wire electrode 14 are opposed to each other with an insulating liquid (hereinafter referred to as processing liquid) 18 interposed therebetween. One batch of this working fluid is usually filled with water and stored in a tank 2o, and the resistivity is adjusted to a predetermined value by the resistivity adjusting device 22, thereby adjusting the degree of insulation. Processing fluid 18 is in tank 2
0 by a pump 24, and is sprayed through a nozzle 28 at the tip of a feed pipe 26 into the gap between the workpiece 1o and the wire electrode 14.

The relative movement of the workpiece and the wire electrode in the X-axis direction and the Y-axis direction is performed by moving the table 12. Therefore, the table 12 is composed of an F table 121 that is movable in the X-axis direction and an upper table 12Y that is installed on the lower table and movable in the Y-axis direction.

Then, the lower table 12X#i (by the X-axis drive motor 30 and threaded rod 32), and the upper table 12! teeth! They are driven by a shaft drive motor 34 and a threaded rod 36, respectively.

With the above configuration, the relative operation between the workpiece lO and the wire electrode 14 can be controlled along the aforementioned X axis, ! This is a two-dimensional horizontal motion within the axial plane.

The wire electrode 14 is supplied from a wire supply reel 38;
The lower electric energy feeding section 4G passes through the workpiece 10 via the lower wire guide 42, and the upper wire guide 44
, upper electrical energy supply section 46 , tension roller 48
The wire is wound onto a wire take-up reel 50 via the wire.

A processing device 52Fi that supplies electrical energy between the workpiece 10 and the wire electrode 14 is composed of a DC power supply 1, a switching element Tr, a capacitor C1, a charging resistor R, and the switching element control circuit 8C. . The control device 54 drives and controls the X-axis drive motor 30 and the Y-axis drive motor 34, and uses a numerical control device, a copying device, a computer, or the like.

FIG. 2 shows a processing pulse train applied between the workpiece 10 and the wire electrode 14 (by the on/off operation of the switching element Tr in FIG. 1), and shows the current peak value p1. Each element has a pulse width τp1 and a pulse pause width τr. This pulse train generates an electric discharge between the workpiece 10 and the wire electrode 14, and while the workpiece is melted by this discharge energy, the drive motors 30 and 34 are driven by the machining condition signal from the control device 54. The table 12 is controlled in the X-axis direction and the Y-axis direction to machine the workpiece 10 into a desired shape.

In order to machine the workpiece 10 into a shape (according to drawing dimensions), it is necessary to align the machining reference plane of the workpiece with the reference plane of the wire-cut electrical discharge machining apparatus, that is, the reference plane of the table. Therefore, conventionally, as shown in FIG.
The reference plane of the wire-cut electrical discharge machining apparatus was aligned with the reference plane 101 of the workpiece 10 by moving the table 12 so that the deflection of the needle 60 of the parallelism measuring device was constant.

However, in the above-mentioned reference surface alignment work, the measurer must determine the parallelism of the workpiece io by observing the deflection of the parallelism measuring device 580 needles 6. It was necessary to measure it. In addition, the workpiece 10
If the 0 reference plane 101L cannot be aligned with the reference plane of the wire-cut electrical discharge machining device, there is a drawback that machining cannot be performed.

The present invention was developed in view of the above-mentioned conventional problem, and its purpose is to allow a measurer with professional 4 degree technology to measure the reference surface of a workpiece using a parallelism measuring device. The reference axis of the table, that is, the X axis! Even if you don't align it with the axis,
An object of the present invention is to provide a wire-cut electrical discharge machining device that can perform machining according to drawing dimensions.

In order to achieve the above object, the present invention applies a voltage between a workpiece placed on a table and a wire electrode passing through the workpiece to generate an electric discharge between the two, and the wire electrode In a wire-cut electrical discharge machining device that cuts the workpiece into a desired shape using the discharge energy by relatively moving the workpiece and the wire electrode in the X-axis direction and the X-axis direction while moving the workpiece in the axial direction, A machine that records machining conditions, an axis rotation processing device that rotates the coordinate axes of machining condition signals continuously output from this recording device, and measures the inclination of a workpiece placed on a table with respect to the reference plane of the table. Based on the measured values of the tilt measuring device, the coordinate axis rotation processing of the machining condition signals successively received from the recording device is performed by the axis rotation processing device, and the above-mentioned machining is performed after performing the coordinate axis rotation processing. The present invention is characterized by comprising a control device that controls relative movement of the workpiece and the wire electrode in the X-axis direction and the X-axis direction according to condition signals.

Hereinafter, preferred embodiments of the present invention will be explained based on the drawings.

FIG. 4 shows an outline of the wire-cut electrical discharge machining apparatus of the present invention, in which the same parts as in FIG. 1 are denoted by the same reference numerals. A recording device 62 such as a perforated paper tape or a magnetic tape records processing conditions such as relative movement distance, speed, and direction between the workpiece 1G and the table 12. The shaft rotation processing device 64 is the recording device 62
Rotate the X, 1 coordinate axis of the machining condition signals successively received from .

The inclination measuring device 66 detects the table 1 by contact detection described later.
The inclination of the workpiece 10 placed on the table 2 with respect to the reference plane of the table is measured.

This slope measurement is performed as follows. As shown in Figure 5,
By moving the wire electrode 14 in the direction of the arrow, the workpiece 1 (1
0 Reference plane 10 1 to point C on the reference surface of the workpiece.
Contact detection is performed more than once to determine the distance j2 between point a and point C in the direction perpendicular to the table reference surface 12a, and measure the inclination of the applied knee 10 with respect to the table reference Ill 21L.

Then, the control device 54, such as a numerical control device, copying device, computer, etc., processes the axis rotation based on the measured value supplied from the inclination measurement device 66. Then, the X-X coordinate axes of the machining condition signals continuously outputted from the recording device @2 are adjusted to the angle [1-
By having the machine have the same position, it is possible to align the reference direction of the applied knee turtle with the reference axis of the machining condition signal.

(÷)=(:::Rini) However, force: Coordinate from the table reference axis (Y: Coordinate from the workpiece reference surface) By performing the above reference alignment process, the fifth Even if the reference directions tea and 12& of the workpiece 10 and table 12 are not parallel as shown in the figure,
The workpiece 10 can be machined to have the same shape and dimensions as the shape 68 shown in FIG. 6 as the shape 70 shown in FIG.

Additionally, the slope of the @ period can also be measured as follows. That is, as shown in FIG. 5, the wire electrode 14 is moved from point a to point C and contact detection is performed in the same way, but the wire electrode 14 is moved to a position other than the 0 point and contact detection is performed two or more times. Then, two points each are selected from a total of three or more points, and the inclination of the workpiece 10 with respect to the table reference plane is determined.

Based on the average value of the obtained inclinations, the drawing dimensions shown in FIG. A workpiece 10 of the same shape and size is machined as shown in Figure 1.
What can you do?

As described above, the present invention determines the inclination of the table of the workpiece with respect to the reference plane, and based on this inclination, rotates the x and y coordinate axes of the nine machining condition signals successively output from the recording device. The reference surface alignment of the workpiece can be performed without depending on the visual acuity and sense of the measurer. Therefore, there are no complicated measurement differences that are influenced by individual differences among the measurers, and processing of the round shape according to the dimensions drawn in the drawing can be achieved with high precision. Further, the reference alignment described above can be performed quickly and accurately automatically or semi-automatically, making it extremely easy to utilize the workpiece effectively and being effective in fully automating a wire-cut electrical discharge machining apparatus.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a wire-cut electric discharge machining device, Fig. 2 is a pulse waveform diagram in the device, Fig. 3 is an explanatory diagram of standard alignment of a conventional workpiece, and Fig. 4 is a wire-cut electric discharge machining device of the present invention. FIG. 5 is an explanatory diagram of measuring the inclination of a workpiece, FIG. 6 is a drawing dimension diagram, and Figure a1!7 is a processing shape diagram based on the drawing dimensions. In each figure, the same members are given the same symbols, 1G is the workpiece, 12Fi table, 14 is the wire electrode, tsFi first hole, 18 is the machining fluid, 20 is the sink, and 22 is the resistivity hook device. , 24 is the pump, 2L& is the feed pipe, 28 is the nozzle, 30
is the X-axis drive motor, 32.36 is the threaded rod, 34 is the Y-axis drive motor, 38 is the wire supply reel, 40.46 is the power supply section, 42.44 is the wire guide, 48 is the tension roller 5G is the wire winding A take-up reel, 52 is a processing device, 5
4 is a control device, 56 is a Jfi body arm, 58 is a parallelism measuring device, 60 is a needle, 62 is a recording device, 64 is a shaft rotation processing device, and 66 is a tilt measuring device. Agent Patent Attorney Makoto Kuzuno - (Name) Figure 5 Y Figure 6 10 7Il1 1/(1 Written amendment (voluntary) June 7, 1980 Mr. Commissioner of the Japan Patent Office 1, Indication of the case Special application No. 57-16610 2
, Title of the invention Wire-cut electric discharge TV7t13, Relationship to the case of the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4 , Agent Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo +11 Note:) 1 5. Detailed description of the invention in the specification to be amended. I”

Claims (1)

[Claims] (1) A voltage is applied between a workpiece placed on a table and a wire electrode passing through the workpiece to generate an electric discharge between the two, and the wire electrode is moved in the axial direction. In a wire-cut electrical discharge machining device that cuts the workpiece into a desired shape by using the discharge energy by moving the workpiece and the wire electrode relative to each other in the KX-axis direction and the X-axis direction while moving, machining conditions are recorded. (9) An axis rotation processing device that rotates the coordinate axes of machining condition signals successively output from this recording device, and (9) an inclination measurement device that is placed on a table and measures the inclination of the workpiece relative to the reference plane of the table. and the shaft rotation processing device based on the measured values of the inclination measuring device), performs coordinate axis rotation processing of nine machining condition signals successively output from the recording device, and performs the above processing after performing this coordinate axis rotation processing. A wire-cut electrical discharge machining apparatus comprising: a control device that controls relative movement of the workpiece and the wire electrode in the X-axis direction and the X-axis direction according to condition signals. (2. In the apparatus of claim (1), automatic position measurement is performed by detecting contact between the wire electrode and the workpiece at two or more points on the reference surface of the workpiece. A wire-cut electric discharge machining device that measures the inclination of the workpiece with respect to the table reference plane and performs coordinate axis rotation processing based on this measurement value. (3) In the device of claim fM11), By measuring the position by contact detection between the wire electrode and the workpiece at three or more points on the surface, the inclination of the workpiece with respect to the table reference plane is automatically measured. A wire-cut electrical discharge machining device that performs coordinate axis rotation processing based on the average value of the inclination.