JPS59196128A - Wire-cut electrical discharge machining apparatus - Google Patents

Abstract

PURPOSE:To facilitate replacement of a working-liquid nozzle by installing a plurality of exchange nozzles in the position where an exchange-nozzle supporting member which is supported, rotatably around a shaft departed by a prescribed distance from the original nozzle, engages with the original nozzles. CONSTITUTION:An original nozzle 2 which supports a die guide part 3 inside and jets-out working liquid, surrounding a working wire 4, is supported onto the undersurface of a wire feeding upper guide part 1. A shaft 5 having a spring receiving part 51 installed at its lower edge is supported onto the undersurface of the wire feeding upper guide part 1. Said shaft 5 rotatably supports an exchange-nozzle supporting member 6 onto which a plurality of exchange nozzles 7 and 7' are installed. Therefore, when a working-liquid nozzle is to be exchanged, the working wire 4 is cut-off, and the exchange-nozzle supporting member 6 is pulled downward and turned, and a new exchange nozzle 7' is replaced with the old one.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a wire force electric discharge machine. In particular, it should be possible to easily respond to requests for changing the machining wire diameter, changing machining conditions based on the shape of the workpiece area, etc., and selecting optimal machining conditions for ζf surface machining, finishing machining, etc. This paper relates to improvements made to wire-cut electric discharge machines for the purpose of.

(2) Background of the technology A wire cant electrical discharge machine is a wire cant electric discharge machine that is a machine that uses a wire cant electrical discharge machine to create a gap between a conductive workpiece such as metal and a wire electrode made of a conductive material such as brass that is stretched in a straight line through the workpiece. Intermittently generates electrical discharge in the injected machining fluid, and this intermittent electrical discharge locally softens or melts the machining area of the workpiece, and also generates intermittent changes in pressure near the machining area, This refers to a machine for processing conductive materials, especially metals, which peels off and removes the softened or melted region of the workpiece by intermittent changes in pressure.

In the wire-cut electrical discharge machining method, it is necessary to confine electrical discharge to the machining fluid, so the electrical discharge machining wire needs to be surrounded by a film of the machining fluid. In other words, it is desirable that the machining fluid surrounds and sheaths the electrical discharge machining wire and flows down in a laminar flow. In order to meet this request,
In a wire-cut electric discharge machine, a nozzle is generally provided to surround a wire guide supported by a wire support arm, and a machining liquid film having a thickness of approximately 1 mm is provided to surround the machining wire. Overcasting process '□It is essential to provide a liquid nozzle on the upper wire kite, but it is desirable to provide it on the lower wire kite as well.

(3) Prior Art and Problems By the way, a brass wire or the like having a diameter of about 0.2 mm is normally used as a wire for electric discharge machining, or the diameter of the wire may be changed as desired. In that case, it is desirable to change the inner diameter of the machining fluid nozzle.

Furthermore, when performing taper processing, it is necessary to increase the inner diameter of the nozzle because the wire must not come into contact with the inner surface of the nozzle.

Furthermore, in the case of end face processing shown in Fig. 1(a),
When the wire is not surrounded by the workpiece and only a portion of the outer circumference of the wire comes into contact with the workpiece, such as in the case of finishing shown in b. By decreasing , excellent milling accuracy can be obtained. In the figure, 10 is a wire for electrical discharge machining, 20 is a workpiece, and arrow A is the direction of movement of the machining wire IO.

Therefore, in such a case, it is desirable to change the inner diameter of the machining fluid nozzle.

However, the conventional wire cant electrical discharge machine
It was common to not be allowed to change the machining fluid nozzle. This is because the necessity and benefits of changing the machining fluid nozzle as described above have not been known in the past, and the structure of the machining fluid nozzle is complex and it is not easy to make it replaceable.

(4) Purpose of the Invention The present invention satisfies the above-mentioned needs and provides a wire cant electrical discharge machine in which the machining fluid nozzle can be easily replaced.

(5) Structure of the Invention The structure of the present invention includes a shaft 5 supported by a wire support arm and extending in the direction of the processing area, and a shaft 5 that is rotatably supported by the shaft 5 and is rotatable around the shaft 5. 5, and a plurality of replacement nozzles 7 supported by this replacement nozzle support member 6 and provided at positions where they engage with the original nozzles 2. This is a wire power discharge machine with a nozzle changing device.

In the configuration described in -4-, as shown in FIG. If the splitter 8 supported by the shaft 5 is pressed in the direction opposite to the processing area, ratchet type switching becomes possible and the replacement of the processing fluid nozzle becomes extremely easy.

2, as shown in FIG. %
When X is set, the machining fluid nozzle can be replaced without temporarily disconnecting the machining wire.

Furthermore, as shown in FIG. 4, in the above configuration,
The above-mentioned axis 5 is inclined with respect to the streamline direction of the original nozzle 2, and the above-mentioned replacement nozzle support member 6 is centered at the intersection of the extension line of the above-mentioned axis 5 and the extension line of the streamline of the original nozzle 2. If it has a spherical surface, it is easy to replace the machining fluid nozzle.

(6) Embodiments of the invention Referring to the following 12 pages, machining fluid nozzle changing device 3 according to the gist of the wire-cut electrical discharge machine according to the embodiments of the present invention.
The example will be further explained.

In the first example, see FIG. 2, 1 is a two-part wire support arm (not shown).
It is a wire feeding upper guide part supported downwardly at the lower part, and the original nozzle 2 is supported on the lower surface thereof. The original nozzle 2 is a cylindrical member with a reduced diameter at the tip (-end), and supports the die guide section 3 inside, and also surrounds the pressure wire 4 to direct the machining fluid to the machining area (lower part). Spray toward. The processing wire 4 is fed through the injection port 21 of the original nozzle 2 and the guide rod 31 of the die guide section 3. A shaft 5 is supported downwardly on the lower surface of the rewire feed upper guide portion 1, and a spring receiver 51 is provided at the lower end of the shaft. , 6 is a replacement nozzle support member, which is rotatably supported by a shaft 5 along the circumference of the shaft 5, and extends in the normal direction of the shaft 5 so that replacement nozzles 7 and 7' can be attached. There is. In this example, since the shaft 5 is not movable in the vertical direction, the replacement nozzle support member 6 is moved upwardly by the spring 8 (
It is supported so that it can be pushed (in a direction opposite to the pressing area) and displaced along the axis 5. This is to facilitate fitting of the replacement nozzle 7, 7' and the original nozzle 2. Further, in this example, the replacement nozzle support member 6 and the replacement nozzle 7.7' are of integral construction, but this construction is not essential. However, since the dimensions of the exchangeable nozzle support member 6 are relatively small, it is actually convenient to have an integral structure as in this example. Although it goes without saying that the diameter of the injection port of the injection lower 1.71'' of the replacement nozzle 7.7'' is different, it is smaller than the diameter of the injection port 21 of the original nozzle 2.

When exchanging the machining fluid/slot using the machining fluid nozzle exchange device having such a structure, first break the machining wire 4, and then move the exchange nozzle support member 6 downward against the force of the spring 8. The replacement nozzle 7, which is currently engaged with the original nozzle 2, is pulled down toward the side to break the engagement,
After rotating the replacement nozzle support member 6 around Ikl]5 so that the other replacement nozzle 7' and the original nozzle 2 can engage, the support member 6 is moved upward by the force of the spring 8. Then, the other replacement nozzle 7' and the original nozzle 2 may be engaged with each other.

Example 2 Refer to Figure 3 This example is a further improvement of the first example described in 1H, and allows the machining fluid nozzle to be replaced while the machining wire 4 remains stretched. .

The figure is a bottom view of the machining fluid nozzle exchange device δ, and in the figure, a slin door 2 is provided concentrically with respect to the support 5 on the exchange nozzles 7, 7', 7' and the exchange nozzle support member 6. ing. The width of the slit 72 is slightly larger than the diameter of the processing wire 4, and is usually about Q, 25 mm.

When replacing the machining fluid nozzle using the machining fluid nozzle exchange device having such a structure, the machining wire 4 can pass through the slit 72, so this can be done without breaking the wire, which is very convenient. It's convenient.

Example 3 (See Figure 4) This example is an improvement in which the machining fluid nozzle can be replaced in a one-touch manner.The replacement nozzle support member 6 is made spherical, and the upper surface of the replacement nozzle 7. The nozzle 115 is electrodeposited so that it can come into contact with the lower end (injection port) 21 of the nozzle 21. In order to realize this configuration, the old nozzle 115 is inclined with respect to the streamline direction of the original nozzle 2, and the replacement nozzle support member 6 is , is a spherical surface whose center is the intersection of the extension line of the axis 5 and the extension line of the streamline of the original nozzle 2. However, the dimensions of the lower end (injection port) 21 of the original nozzle 2 and the replacement nozzle 7.7' It is desirable to select a size that roughly matches the size of the upper opening of the original nozzle 2, and the lower end (injection port) 21 of the original nozzle 2 and the upper opening of the replacement nozzle 7.7'' should be selected so that they are electrodeposited. This is desirable.

When replacing the machining fluid nozzle using the machining fluid nozzle exchange device having such a structure, the machining fluid nozzle can be replaced by simply rotating the shaft 5 without pulling out the support 5.

Furthermore, if it is combined with the configuration shown in FIG. 3, one-touch replacement is possible.

(7) As described in detail, according to the present invention, it is possible to provide a wire-cut electrical discharge machine in which the machining fluid nozzle can be easily replaced.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are explanatory views of the end face processing method. FIG. 2.3.4 is a conceptual configuration diagram of a machining fluid nozzle exchange device according to the gist of a wire-cut electrical discharge machine according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Wire for electrical discharge machining, 20... Workpiece, A... Traveling direction of the processing wire, 1...-Wire feeding upper guide part, 2... Original nozzle,
21Φ・e injection port, 3φφ・Dice kite part,
31ΦΦφGytro, 4, fist, processed wire, 5
...Shaft, 51...Spring receiver, 6...
Replacement nozzle support member, 77', 7"... Replacement nozzle, 71. 71', 71"... Injection port, 72
...Slit, 8...Spring. Agent Patent attorney Makoto Kankawa − =18:

Claims (5)

[Claims] (1) a support 5 supported by a wire support arm and extending toward the processing area; an exchange nozzle support member 6 rotatably supported by the shaft 5 and extending in the normal direction of the shaft 5; A wire-cut electric discharge machine having a machining fluid nozzle exchange device comprising a plurality of exchange nozzles 7 supported by the exchange nozzle support member 6 and provided 1ξ apart to engage with the original nozzle 2. (2) The replacement nozzle support 8B material 6 and the plurality of replacements/
It has a separate structure from the replacement nostle support member 6.
A wire-cut electric discharge machine according to claim 1, wherein the spring 8 is pressed in a direction opposite to the machining area by a spring 8 supported by the @h5. (3) The replaceable nozzle support member 6 and the plurality of replaceable nozzles 7 are of an integral structure, and the replaceable nozzle support member 6 is moved in a direction opposite to the processing area by a spring 8 supported by the shaft 5. A wire cant electric discharge machine according to claim 1, which is pressed. (4) The replacement nozzle 7 and the replacement nozzle support member 6 have a sulin 1-72 concentrically with respect to the shaft 5 in a part thereof.
A wire-cut electric discharge machine according to claim 1, wherein the wire-cut electric discharge machine is provided with: (5) The axis 5 is inclined with respect to the streamline direction of the original nozzle 2, and the replacement nozzle support member 6 has an intersection point between the extension line of the axis 5 marked 1iii and the extension line of the streamline of the original nozzle 2. A wire cant electrical discharge machine according to claim 1 or 4, which forms a spherical surface at the center.