JPS5915775B2 - Wire cut electrical discharge machining equipment - Google Patents

Description

[Detailed Description of the Invention] This invention uses an optical drawing copying device to electrical discharge machine the workpiece by making it follow the drawing shape or a similar shape to a conductive wire electrode. The present invention relates to a wire-cut electrical discharge machining device.

In general, the workpieces processed by this type of equipment are often used in molds, and the molds, especially the dies that are the cutting dies, require a draft angle. It is desirable that it can be processed into a tapered shape.

However, in conventional devices, the support method for both the upper and lower sides of the wire electrode that generates electric discharge is a fixed type, and the workpiece is simply driven with respect to the wire according to the drawing shape or a similar shape. The disadvantage is that the workpiece cannot be machined into a cone-like tapered shape.

This invention has a structure in which the wire support portion can be rotationally driven.
The present invention provides a wire-cut electrical discharge machining device that can easily eliminate the above-mentioned drawbacks and machine a predetermined cone-shaped taper on a workpiece by supplying this rotational drive signal from an optical drawing copying device. be.

An embodiment of the inventive device will be described below with reference to the drawings. That is, in FIG. 1, 1 is a part of an optical drawing copying device, 2 is a part of a wire-cut electric discharge machining device according to the present invention, 3 is a diagram inclination angle tracking device, 4 is a feed speed stage analysis mechanism, and 5 is a part of a wire cut electric discharge machining device according to the present invention. 1 is a servo motor, 6 is a 20 synchro oscillator, and T is a graph inclination angle tracking device 3 by the above servo motor.
8 is an integrator, and 9 is a scale mechanism.

Further, 10 is a second servo motor, 11 is a synchro transformer, 12 is a wire upper support device, 13 is a workpiece, 14 is a cross table that drives 25 workpieces according to the drawing, 1
Reference numeral 5 denotes a wire lower support device, 16 a wire electrode, and 17 a servo amplifier for transmitting the output θ of the diagram inclination angle tracking device 3 to the wire upper support device 12 by a synchronized servo system. 30. FIG. 2 is a detailed view of the wire support portion of the wire-cut electrical discharge machining apparatus in FIG. 1.

In FIG. 2, 18 is a nozzle that guides the wire 16, and this nozzle has a structure in which the eccentricity can be adjusted to an arbitrary value by means of a feed screw 24vc. 35 upper support device 12, servo motor 10 and synchro transformer 11 are connected by the same gear.

FIG. 3 is an explanatory diagram of the operation of this device. In this FIG. 3, 19 is the copying drawing pasted on the optical drawing copying device 1, θ is the inclination angle of the drawing, and 20 is the wire cut discharge force. The locus of the nozzle 18 on the wire upper support device of the support device 2 with respect to the workpiece, 21 is the wire lower support device 15
The trajectory of the nozzle 18 with respect to the workpiece 13 at 22
is the amount of eccentricity when the nozzle 18 is eccentrically moved by the feed screw 24.

The inclination angle θ of the diagram is detected by the diagram inclination angle tracking device 3, and the diagram inclination angle tracking device 3 rotates by the inclination angle θ, and transmits this inclination angle θ to the sink mouth oscillator 6 via the gear. As a result, the wire upper support device 12 is rotated by the inclination angle θ through the synchro transformer 11 and the servo motor 10.

In this case, the position of the nozzle 18 is adjusted so that it is perpendicular to the tangential direction 23 of the diagram, that is, the processing direction 25 of the workpiece 13, or a direction close to it.

This action causes the wire 16IIC. The wire 16 can always be tilted at a fixed angle in the direction perpendicular to the movement direction, and machining with a cone-shaped taper can be performed, and since the eccentricity 22 has a variable structure, the taper angle of the wire 16 with respect to the workpiece 13 can be set arbitrarily.

In addition, although the case where the wire upper support device is controlled is described above, the wire lower support device is not limited to this, and the wire lower support device may be controlled in the same manner, or the wire lower support device may be controlled simultaneously as shown in FIG. 4. You may.

Furthermore, although the above-mentioned rotational angle transmission method is carried out using a synchronized servo system using a motor, it is also possible to use only torque synchronization without using a motor.

Furthermore, although a nozzle is used in the wire guide method, it is clear that any guide method that can perform the wire inclination according to the above method can be used.

As explained above, since the wire support part of this invention is of a rotating type, the wire can be tilted at a predetermined angle with respect to the workpiece, and therefore the workpiece can be machined into a shape with a constant conical taper. The above-mentioned rotation angle and its direction are mechanically very simple because the output from the diagram inclination angle tracking device constituting the optical drawing copying device is directly transmitted by the synchronized system.

Furthermore, the workpiece that has been strengthened by this inventive device is shown in Figure 5a.
(As shown in FC, both the outer side 27 and the inner side 26 (internal machining scraps cut off during machining) have a certain taper shape, and as shown in Fig. 5b, the outside of the workpiece By reducing the clearance between 27 and the inner side 26, it becomes possible to perform simultaneous machining using punches and dies, which was impossible with conventional machining methods.

Further, since the outer side 27 of the workpiece processed by this method has a taper, when used as a die, this taper becomes a draft angle, which is very effective for die manufacturing.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the inventive device, Fig. 2 is a sectional view showing the wire support device of the wire cut electric discharge machining device, Fig. 3 is a diagram explaining the operating principle of the inventive device, and Fig. 4 is FIG. 2 is a view corresponding to another embodiment of the present invention, and FIG. 5 is a view showing →u of the shape of a workpiece machined by the apparatus of the present invention. Note that the same reference numerals in the figures indicate the same or corresponding parts. 1
. . . Optical drawing copying device, 2 . . Wire cut electric discharge machining device, 6 . Synchro oscillator, 11 .
Workpiece, 14... Cross table, 15... Wire lower support device, 16... Wire.

Claims (1)

[Claims] 1 first and second wire support mechanisms that support a conductive wire for electrical discharge machining of a workpiece by forming an electrical discharge machining area of the conductive wire; and at least one of the first and second wire support mechanisms. a rotation mechanism that supports one at an eccentric position; a drive mechanism that drives the rotation mechanism; and a diagram inclination angle that detects the inclination angle of the target shape diagram drawn on the drawing and outputs a signal corresponding to the inclination angle. A wire-cut electric discharge machining apparatus comprising a tracking device and a signal transmission mechanism for transmitting an output of the diagram inclination angle tracking device to the drive mechanism.