JPS60123220A - Wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To improve working properties in electric discharge machining, by installing oa flexible member in a part being opposed to a work, among nozzles, while feeding a machining fluid via a through hole installed in this flexible member. CONSTITUTION:Among nozzles 50, each flexible member 60 such as cloth, leather and the like is attached to a cpart being opposed to a work 10. In this member 60, there is provided with a through hole 61 which is used for feeding a machining cluid to a gap (spark gap) S between the work 10 and a wire electrode 20. With pressure in the machining fluid 40, the flexible member 60 expands whereby its tip part comes into contact with a surface of the work 10 and all the machining fluid 40 is fed to the spark gap S, thus working properties are improved.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a wire-cut electric discharge machine, and particularly to a wire-cut electric discharge machine having a nozzle that spouts machining fluid into the gap between a workpiece and a wire electrode. Ru.

[Background Art] FIG. 1 is a cutaway front view showing the relationship between a nozzle and a workpiece in a conventional wire-cut electric discharge machine. In a wire-cut electric discharge machine, when the machining fluid 40 is spouted from the nozzle 30 into the gap S between the workpiece 10 and the wire electrode 20 (that is, the gap S), the nozzle 30
Do not obstruct the movement of Therefore, it is necessary to maintain a predetermined distance 1111d between the nozzle 30 and the workpiece 10.

By the way, if the distance 111id between the nozzle 30 and the workpiece 10 is made too large, the machining fluid 40 will scatter, and
The flow rate of the machining fluid 40 in the machining gap S decreases. Processing fluid 4
If the zero particles scatter, there will be a problem that workability will be reduced, and if the flow rate of the machining fluid 40 is reduced, there will be a problem that gas and chips cannot be removed quickly.

In order to prevent the flow rate of the machining fluid 40 from decreasing in the machining gap S, it is possible to increase the fluid pressure.

However, when the fluid pressure is increased beyond a predetermined value,
Since air gets mixed in between the wires and air discharge occurs, wire breakage occurs, and in this case, the amount of machining fluid 40 scattered increases, further reducing work efficiency.

On the other hand, if the distance d between the nozzle 30 and the workpiece 10 can be maintained within a predetermined value within a range where the nozzle 30 does not come into contact with the workpiece 10, the above-mentioned problem will not occur, but the surface of the workpiece 10 may not necessarily be horizontal. Therefore, it is actually very difficult to maintain that distance accurately.

[Object of the Invention] The present invention has been made in the name of the above-mentioned conventional problems, and it not only does not impede the relative movement between the nozzle and the workpiece, but also extremely high hydraulic pressure. It is an object of the present invention to provide a wire cutter electric discharge machine that can easily ensure a predetermined flow rate of machining fluid between the two.

[Summary of the Invention] In order to achieve the above object, the present invention provides a nozzle that includes:
A flexible member is installed in a portion facing the workpiece, and a hole is provided in the flexible member for supplying machining fluid to the gap between the workpiece and the wire electrode.

[Embodiment of the invention] - FIG. 2 is a longitudinal sectional view showing an embodiment of the invention. Note that the same members as those used in the conventional example shown in FIG. 1 are given the same reference numerals.

First, a pulse voltage is generated by a power supply circuit (not shown), and the pulse voltage is applied between the workpiece 10 and the wire electrode 20, and discharge is continuously performed. Further, the machining fluid 40 is sent to the nozzle 50 by a pump (not shown), and from this nozzle 50, the workpiece 10 and the wire electrode 2 are
The machining fluid 40 is ejected into the gap S between the

A flexible member 60 made of cloth, leather, etc. is attached to a portion of the nozzle 50 that faces the workpiece 10. This flexible member 60 is provided with a port 61 . This port 61 is for supplying the machining fluid 40 to the gap S between the workpiece 10 and the wire electrode 20. The flexible member 60 may be attached to the nozzle 50 in any manner, such as by adhesion or by tightening with a band or the like.

Note that the reference numeral 51 is the tip of the nozzle 50.

When the machining fluid 40 is injected into the machining gap S in this manner at a predetermined hydraulic pressure, the state shown in FIG. 2 is achieved. That is, the flexible member 60 swells due to the pressure of the machining liquid 40, and its tip comes into contact with the surface of the workpiece 10, and all of the machining liquid 40 is sent to the gap S.

Therefore, the machining fluid 40 does not scatter, and
The flow velocity of the machining fluid 40 in the gap S does not decrease. In this way, since the machining fluid 40 does not scatter, it has the advantage that there is no inconvenience such as deterioration of workability, and since the flow rate of the machining fluid 40 does not decrease, the gas and chips in the machining gap S can be quickly removed. It has the advantage that it can be removed.

In this case, since the predetermined flow rate can be obtained even with the desired hydraulic pressure, there is no need to increase the desired hydraulic pressure.

Therefore, it is possible to prevent air from entering the machining fluid 40 due to an increase in fluid pressure, so that no air discharge occurs. Therefore, there is no risk of wire breakage.

Moreover, since the flexible member 60 is sufficiently extended to the surface of the workpiece 10 by the hydraulic pressure, the distance between the tip 51 of the nozzle 50 and the workpiece 10 is 1! It is not necessary to set fdl so accurately, and no particular problem occurs even if the surface of the workpiece 10 is somewhat uneven. Note that since the tip of the flexible member 60 has elasticity, there is little FJ friction between the tip and the workpiece 10.

Therefore, it goes without saying that the relative movement between the nozzle 50 and the workpiece 10 is not hindered, and it is easy to maintain a predetermined flow rate of the machining fluid 40 in the machining gap S without increasing the fluid pressure too much. It has the advantage of being able to

FIG. 3 is a cutaway front view showing another embodiment of the present invention. In this embodiment, a small hole 62 is provided in the flexible member 60 of FIG.

By providing this small hole 62, a gap d2 is created between the flexible member 60 and the workpiece 10 at the point where the machining fluid 40 is being spouted. This gap d2 further reduces the friction of the flexible member 60 against the workpiece 10. The gap d2 is created because the machining fluid 40 passes between the flexible member 60 and the workpiece 10 after passing through the small hole 62. The size and number of small holes 62 may be determined as necessary.

FIG. 4 is a cutaway front view showing another embodiment of the present invention. In this embodiment, a bellows 65 is used as the flexible member 60 shown in FIG.

The bellows 65 is generally made of metal and hard,
In Figure 4, the bellows 6 has elasticity in the L'F direction.
Even if the tip of the nozzle 5 comes into contact with the workpiece 10, the relative movement of the workpiece 10 with respect to the nozzle 50 is not disturbed. Therefore, the embodiment of FIG. 4 has the same advantages as described in FIG.

Of course, the small holes 62 described in FIG. 3 can be provided in the bellows 65 and the same advantages as described in FIG. 3 can be obtained in this case.

In addition to the above embodiments, the flexible member may be made of rubber or carbon fiber. If carbon fiber is used, it will have excellent wear resistance. Further, a portion of the nozzle 50 that faces the workpiece 10 may be made of a flexible material.

Further, in the above embodiment, the nozzle and the flexible member are provided on the upper and lower sides of the workpiece 10, but the flexible member may be provided on one of the upper and lower sides. The flexible member 60 should be flexible at least in the vertical direction. Further, the machining fluid 40 includes all commonly used fluids such as kerosene and water.

[Effects of the Invention] As described above, the present invention has the advantage of not only not interfering with the relative movement between the machining fluid nozzle and the workpiece in a wire-cut electric discharge machine, but also achieving a high level of machining distance without increasing the fluid pressure too much. This has the effect of easily ensuring a predetermined flow rate of the machining fluid.

[Brief Description of the Drawings] Fig. 1 is a cutaway front view showing the relationship between a machining fluid nozzle and a workpiece in a conventional electrical discharge machine, and Fig. 2 is a cutout front view showing an embodiment of the present invention. , FIG. 3 is a cutaway front view showing another embodiment of the invention, and FIG. 4 is a cutaway front view showing another embodiment of the invention. 10... Workpiece, 20... Wire electrode, 40...
Processing liquid, 50... Nozzle, 60... Flexible member, 6
1...Port, 62...Small hole, 65...Bellows as a flexible member. Patent Applicant Sodick Co., Ltd. Figure 1 Figure 2 Figure 3 O Figure 4 Procedure-? 11 Correct writing method) % formula % 2. Name of the invention Wire-cut electric discharge machine 3. Relationship with the case of the person making the amendment Patent applicant address 1-5-1 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Name Sodick Co., Ltd. 4 Agent 5, date of amendment order: February 28, 1982 (shipment date)
6. Subject of amendment Full text of the specification

Claims (1)

[Scope of Claims] (1) A wire-cut electric discharge machine having a nozzle for applying a pulse voltage between a workpiece and a wire electrode and spouting machining fluid into a gap between the workpiece and the wire electrode, A wire characterized in that a flexible member is provided in a portion of the nozzle that faces the workpiece, and the flexible member is provided with an opening for supplying the machining liquid to the gap. Cut electric discharge machine. (2. The wire cut electric discharge machine according to claim 1, characterized in that the flexible member has flexibility at least in the vertical direction. (3) In claim 1, the flexible member is cloth, leather, rubber, or bellows. (4) In claim 1, the flexible member is cloth, leather, rubber, or bellows. A wire-cut electric discharge machine characterized in that the flexible member is a wire having a small hole. (5) In claim 4, d5, the flexible member has porous properties A wire-cut electric discharge heater.