JPH0474130B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for positioning a wire electrode in a wire electrical discharge machining device.

[Conventional technology]

FIG. 2 is a configuration diagram showing a positioning method in a wire electrical discharge machining apparatus, in which 1 is a wire electrode, 2 is an upper wire guide that supports the wire electrode 1, 3 is a lower wire guide, and 4 and 5 are upper wire guides 2.
6 is a processing table, 7 is an X- and Y-axis cross table, 8 and 9 are X- and Y-axes drive motors for moving the cross table 7 in any direction; Y-axis drive motor, 10
is the workpiece attached to the processing table 6, 11
1 is a coordinate reading device for each axis, and 12 is a calculator.

FIG. 3 is a side view showing the relationship between the wire electrode 1 and the end surface 13 of the workpiece 10, where 14 is the protrusion closest to the wire electrode 1 on the end surface 13 of the workpiece.

When processing the workpiece 10, it is first necessary to position it. Therefore, the X and Y axis drive motors 8 and 9 are operated to move the wire electrode 1 to the vicinity of the end surface 13 of the workpiece. At that time, wire electrode 1
stops moving when it comes into contact with the protrusion 14 on the end face that is closest to the wire electrode 1. The coordinate values of the X and Y axes at this stopped position are read by the coordinate value reading device 11 and stored in the computer 12. This stored value is corrected in consideration of the diameter of the wire electrode, and the computer 12 calculates the amount of movement of the wire electrode to the positioning position. , 9 to move and position the electrode 1.

[Problem that the invention seeks to solve]

The conventional positioning method is performed as described above. Therefore, if the end face of the workpiece is not smooth, the protrusions caused by the undulations or surface roughness of the end face must be detected and positioned.
The finish of the end face of the workpiece not only affects positioning accuracy but also may cause errors in the pitch of the workpiece. If the end surface is smooth, the wire electrode will make a line contact with the end surface, but in order to maintain positioning accuracy, it is preferable to make point contact with the end surface of the wire.

These points have been major problems with conventional positioning methods.

The present invention has been made to solve the problems of the conventional method as described above, and the conventional apparatus can be used as is without being affected by the accuracy of the end face of the workpiece. The present invention aims to provide a highly accurate positioning method.

[Means for solving problems]

In order to achieve the above object, the positioning method according to the present invention sets a desired point on the ridge line where the end surface of the workpiece intersects with the upper or lower surface as a reference point, and uses the taper machining device of the electric discharge machining device to align the wire electrode. The positioning is performed by tilting the reference point and detecting the reference point.

[Effect]

When positioning is performed by the above method, the wire electrode makes point contact with the ridgeline of the end face and avoids contact with the end face protrusion, so highly accurate positioning is possible that is not affected by the waviness or surface roughness of the end face.

[Embodiments of the invention]

FIG. 1 shows a wire electrode 1 showing an embodiment of the present invention.
and a side view showing the relationship between the end face 13 of the workpiece,
In the figure, 15 is the highest point of the end surface 13 of the workpiece, and 16 is the lowest point.

For positioning, first operate the U- and V-axis drive motors 4 and 5 for the taper processing device to move the upper wire guide 2 so that the wire electrode 1 does not come into contact with the protrusion 14 on the end surface 13 of the workpiece. While doing so, the contact point 15 or 16 is tilted at an arbitrary or predetermined angle in the direction of the desired contact point 15 or 16. Next, while keeping the wire electrode 1 tilted, the X and Y axis drive motors 8 and 9 are operated as in the conventional positioning method, and the wire electrode 1 is moved in the direction of the end face 13 of the workpiece to be positioned. The moved wire electrode 1 comes into contact with the uppermost point 15 or the lowermost point 16 of the end surface 13 of the workpiece due to the inclined direction and stops moving. The coordinate values of each of the stopped X, Y, U, and V axes are read by the coordinate value reading device 11 and stored in the computer 12. After correcting this stored value by taking into account the wire electrode diameter and wire electrode inclination angle, the amount of movement of the wire electrode to the positioning position is calculated by the calculator 12, and the U and V axes are adjusted according to the calculated amount of movement. The drive motor and the X and Y axis drive motors 8 and 9 are operated to move the wire electrode 1 and complete positioning.

According to the above positioning method, the wire electrode makes point contact with the upper surface or the lower surface without contacting the protrusion on the end surface, so that the positioning accuracy is improved regardless of the shape of the end surface.

In addition, in the above example, the highest point 15 and the lowest point 16
Although either of these points is selected as the contact point, it is also possible to detect both points and perform positioning using the average value of the positioning coordinate values obtained from both points as the new positioning coordinate value.

Further, in the above embodiment, after tilting the wire electrode 1 at a certain angle, the X and Y axis drive motors 8 and 9 are operated to move the wire electrode 1 toward the end surface 13 of the workpiece. Using only the U and V axis drive motors 4 and 5 without using the axis drive motors 8 and 9, the wire electrode 1 is moved until it touches the desired contact point.
The coordinate values of the contact point may be detected by continuously tilting the contact point.

Further, although the above embodiment is an example of a method for positioning the end face 13 of the workpiece, the machined end face after wire electric discharge machining may be positioned by this method. According to this method, while the workpiece 10 is attached to the processing table 6, the dimensions of the contour shape after being subjected to electrical discharge machining can be measured. As a result, only when the measured value of the contour size is larger than the desired value in the case of a punch, or smaller than the desired value in the case of a die, it is possible to correct the shape to the desired size by a second cut method or the like.

〔Effect of the invention〕

In the present invention, when positioning the wire electrode of the wire electric discharge machining device, reference points are set on the upper and lower surfaces of the workpiece and these points are measured, so that the desired dimensional surface can be selected. Moreover, the excellent effect of achieving high-precision positioning, which is unaffected by the waviness or surface roughness of the end face of the workpiece, can be achieved at a low cost without the need for special jigs.

[Brief explanation of drawings]

Fig. 1 is a side view showing the relationship between the wire electrode and the end surface of the workpiece, which is an embodiment of the present invention, Fig. 2 is a perspective view of a wire electrical discharge machining device, and Fig. 3 is the wire electrode and the end face of the workpiece. FIG. In the figure, 1 is a wire electrode, 2 is an upper wire guide,
3 is a lower wire guide, 4 and 5 are motors, 6 is a processing table, 7 is an X- and Y-axis cross table, 8,
9 is a motor, 10 is a workpiece, 11 is a coordinate reading device, 12 is a calculator, 13 is an end face of the workpiece,
14 is a protrusion on the end surface, 15 is the highest point on the end surface, 16
is the lowest point of the end face. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In the positioning method of wire electrical discharge machining equipment, in which the wire electrode and the workpiece are brought into contact and the positioning is performed based on the coordinate values of the contact point, a taper processing equipment is used to tilt the workpiece by an arbitrary or predetermined angle. The wire electrode is used as a reference by touching a desired point on the ridge line where the end surface of the workpiece intersects with the upper or lower surface of the workpiece, and after correcting this reference according to the wire electrode diameter and wire electrode inclination angle. A method for positioning a wire electrical discharge machining apparatus, characterized in that positioning is performed by calculating the amount of movement of a wire electrode to a positioning position.