JPH0550331A - Wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent a working fluid from scattering by changing the form of a nozzle and reducing the quantity and force of the jetted working fluid, running along a work, hard to be recovered or handled. CONSTITUTION:A flange part 37F is solidly installed in the tip of a conical nozzle 37 and, in turn, an inlet port 39, conducting a working fluid in a direction of being opposed to a work, is formed in this flange part 37F. The inlet port 39 is featured that it is composed of a ring groove 41 and plural pieces of interconnecting holes 43 being interconnected to this groove 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-cut electric discharge machine, and more particularly to a wire-cut electric discharge machine for injecting a machining fluid from a nozzle onto a work to perform electric discharge machining.

[0002]

2. Description of the Related Art Conventionally, a wire-cut electric discharge machine is provided with a guide portion for axially guiding a wire electrode at the tips of upper and lower arms which are vertically separated from each other and energized to energize the wire electrode. A wire guide device comprising a section is provided. This wire guide device is provided with a nozzle that supplies a working liquid to a working gap between the wire electrode and the work. The gap between the nozzle and the work is set so that the maximum specified hydraulic pressure is generated, and the high-pressure machining liquid is used to improve the machining condition from the outlet holes of the upper and lower nozzles toward the wire and work discharge location. Is gushed out.

At this time, the jetted machining liquid radiates laterally along the upper and lower surfaces of the work in a radial pattern at a great speed. For this reason, a general structure is equipped with a shatterproof guard.

[0004]

By the way, in the nozzle of the above-mentioned conventional wire-cut electric discharge machine, the jetted machining liquid flows out and scatters along the upper and lower surfaces of the workpiece at a tremendous speed. For this reason, a guard for scattering is equipped, but since a slight amount of clearance is required between the fixed guard and the moving work, it is not possible to completely prevent scattering. As usual, the machining fluid running along the work surface was scattered.

Further, a method of providing a low-friction material on the end face of the nozzle and bringing it into contact with a work to seal it, and a method of providing a buffer at a position where the scattered working liquid collides have been considered. There has been a problem of deterioration of shape accuracy and a problem of external scattering due to the strong momentum of the working liquid splashing from the outer peripheral portion of the nozzle end surface.

In order to solve the above problems, the object of the present invention is to change the shape of the nozzle so as to reduce the amount and momentum of the working fluid that runs along the surface of the workpiece which is difficult to collect and process, and It is intended to provide a wire-cut electric discharge machine for preventing scattering.

[0007]

In order to achieve the above object, the present invention provides a wire-cut electric discharge machine with a nozzle for supplying a machining liquid to a machining gap between a work and a wire electrode. A wire-cut electric discharge machine was constructed by providing an inlet near the mouth to guide the jetted machining liquid toward the surface of the workpiece.

[0008]

By adopting the wire-cut electric discharge machine of the present invention, an introduction port is provided in the workpiece facing direction in the vicinity of the nozzle port of the nozzle that supplies the machining liquid to the machining gap between the work and the wire electrode. For this reason, the jetted machining fluid flows out along the upper and lower surfaces of the workpiece, and is also guided to the introduction port and flows out in the facing direction of the workpiece, reducing the amount and momentum of the machining fluid that runs along the surface of the workpiece. To be done.

[0009]

[Example] Since a wire-cut electric discharge machine is known,
Conceptually showing the overall configuration, the wire-cut electric discharge machine is, as shown in FIG. 5, a machining fluid tank 5 whose movement is controllable in X and Y axis directions on a main body frame 1 via an X and Y table 3.
The workpiece W is supported in the machining liquid tank 5 via the workpiece support member 7. An upper arm 9 and a lower arm 11 supported by the body frame 1 are arranged above and below the work W, and a wire electrode 13 is attached to the tip of each of the upper and lower arms 9 and 11. Provided are wire guide devices 15U and 15L each having a guide part for guiding in a direction and an energizing part for energizing the wire electrode 13, and a nozzle for supplying a working liquid to a working gap between the wire electrode 13 and the work W. Has been.

Now, referring to FIG. 4, the upper wire guide device 15U includes an upper arm 9 via a bracket 17.
Installed on. More specifically, the bracket 1
A disc-shaped support block 19 is fixed to the lower surface of 7 by bolts or the like, and a guide unit 21 penetrating the bracket 17 is detachably fixed to the center of the support block 19 in the upward direction by bolts or the like. There is. The guide unit 21 has a small-diameter hole guide 23 in which a small hole is formed as one part of a guide portion for guiding the wire electrode 13 in the axial direction.
Is provided, and an energizing piece 25 that contacts the wire electrode 13 and energizes is provided.

The support block 19 includes a bracket 1
7, an annular groove 29 communicating with the machining liquid inlet 27 is formed.

On the lower surface of the support block 19, there is further attached a nozzle 37 having a conical shape and a flange at the bottom through a cap nut 35. This nozzle 37
For example, it is formed in a tapered shape from an insulating material such as resin, and is provided so as to cover the lower surfaces of the jet nozzle 33 and the support block 19 and surrounds the wire electrode 13 to form a nozzle opening 37H. I am doing it. The nozzle port 37H is provided concentrically with the wire electrode 13 similarly to the outlet of the jet nozzle 33. The groove 29 is a conical machining passage 3 between the jet nozzle 33 and the nozzle 37.
It communicates with 2.

More specifically, referring to FIGS. 1 and 2, a flange portion 37F is integrally provided at the tip of a nozzle 37 having, for example, a conical shape.
Is formed with an inlet 39 for guiding the machining liquid in the surface facing direction of the workpiece. The inlet 39 has an annular groove 41 and an annular groove 41.
And a plurality of communication holes 43 communicating with each other. 1 and 2, the upper wire guide device 15U is shown.
The nozzle 37 of the lower wire guide device 15L is omitted, but since it has the same configuration, its illustration and description are omitted.

With the above structure, the flow of the jetted machining fluid is, as shown in FIG. 3, the direction in which the jetted machining fluid flows along the surface of the work W and the direction in which it is jetted in the facing direction of the work W. Dispersed in. That is, the direction indicated by the dotted line arrow in the drawing of FIG. 3 is the flow of the machining liquid jetted along the surface of the work W, and the direction indicated by the solid arrow in the drawing is the facing direction of the work W. Is the direction to squirt
The jetted machining fluid enters the annular groove 41 and the plurality of communication holes 4
It is ejected from 3 in the direction of facing the work W.

Therefore, the amount and momentum of the working liquid running along the surface of the work W can be reduced, and the scattering of the working liquid can be prevented.

Referring again to FIG. 4, since the lower wire guide device 15L has a structure similar to that of the upper wire guide device 15U, a schematic description will be given. The guide unit 47 is attached to the bracket 45 provided on the lower arm 11. It is installed. The guide unit 47 is provided with a small-diameter hole guide 49 as a part of the guide portion of the wire electrode 13, and a conical wire guide tip 51 is provided at the upper end portion. Further, an energizing piece 53 that contacts the wire electrode 13 and energizes is provided in the central portion.

The bracket 45 is provided with an annular groove 55 for supplying a machining fluid in communication with a machining fluid supply port (not shown), and a nozzle 57 having a conical shape and an upper flange is supported. Cylindrical nozzle support member 59
Are provided so as to surround the guide unit 47.
The nozzle 57 made of an insulating material is attached to the upper portion of the nozzle support member 59 by a cap nut 61.

The nozzle 57 and the guide tip 5 are
A conical machining fluid passage 63 is formed between the machining fluid passage 1 and the machining fluid 1. Further, a safety cover member 65 made of an insulator is attached to the outer periphery of the nozzle support member 59. A wire electrode carry-out device 67 for carrying out the wire electrode 13 is provided in the lower arm 11. The nozzle 57 has the same structure as the nozzle 37 provided in the above-mentioned upper wire guide device 15U, and has a nozzle opening 57H.
An annular groove 41, which is the inlet 39, and a plurality of communication holes 43 communicating with the groove 41 are formed in a flange portion 57F provided on the nozzle 57 provided with the workpiece W in the facing direction.

With the configuration as described above, the nozzle port 37
A part of the working fluid that runs along the surface of the work W from H and 57H is temporarily stored in the annular groove 41 and at the same time, jumps out from the communication hole 43 in the work facing direction, so that the outer diameters of the flange portions 37F and 57F. Therefore, both the amount and the momentum of the working liquid flowing out along the surface of the work W are reduced.

By reducing the amount and momentum of the working fluid running along the work surface, which is difficult to prevent from being scattered, it is possible to suppress the scattering of the working fluid.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, in this embodiment, an annular groove 41 is used as the inlet 39 of the nozzles 37 and 57.
A plurality of communication holes 43 are provided in the
May be an elongated hole, a tapped hole, a tapered hole, or the like, and the groove 41 may be plural. The cross-sectional shape of the groove 41 is a square groove, U
Grooves, V-grooves or the like may be used, and the flange portions 37F and 57F may be two or more parts or may be detachable, and there may be no holes and only a hole. In short, any method may be used as long as it directs the jetted machining liquid in the direction of facing the workpiece, and a suction method can also be adopted.

[0022]

As can be understood from the above description of the embodiments, according to the present invention, by providing the introduction port for guiding the machining liquid ejected from the nozzle in the direction of facing the work,
Part of the jetted machining fluid is jetted from the inlet in the direction facing the workpiece. For this reason, both the amount and the momentum of the machining fluid that radially runs along the upper surface of the work are reduced.

By reducing the amount and momentum of the working fluid running along the work surface, which is difficult to prevent from being scattered, it is possible to prevent the working fluid from scattering.

[Brief description of drawings]

FIG. 1 is a magnified view of a main part of the present invention, showing an I arrow part in FIG.

FIG. 2 is a bottom view of FIG.

FIG. 3 is an explanatory view of the operation of the present invention.

FIG. 4 is an enlarged cross-sectional view taken along the arrow IV in FIG. 5, which is an embodiment for carrying out the present invention.

FIG. 5 is an overall explanatory view schematically showing the overall configuration of a wire cut electric discharge machine according to an embodiment of the present invention.

[Explanation of symbols]

 13 Wire Electrode 37 Nozzle 37H Nozzle Port 39 Inlet Port 57 Nozzle 57H Nozzle Port

Claims (1)

[Claims] 1. A wire-cut electric discharge machine is provided with a nozzle for supplying a machining liquid into a machining gap between a work and a wire electrode, and the jetted machining liquid is introduced near the nozzle opening of the nozzle in a direction facing the work. A wire cut electric discharge machine characterized by having a mouth.