JPS59169726A - Wire cut electrical discharge machining method - Google Patents

Abstract

PURPOSE:To prevent a machining liquid from being scattered even if injection pressure of the machining liquid is high, by providing a second splash guard made of a plate-shaped member and having a size smaller than the original splash guard. CONSTITUTION:In a wire electrical discharge machining method by making use of an electrical discharge machine provided with a splash guard constituted by a plate-shaped member arranged surrounding a wire machining region, a state is illustrated where electrical discharge machining is executed on a workpiece 7 surrounded by the supporting frame of a second splash guard 34. Then, in case the pressure of a machining liquid injection flow is made higher, particularly in an early stage of the machining where the machining liquid is severely scattered, it is possible to effectively prevent the machining liquid from being scattered by arranging, for machining, a guard 34 so as to locally cover a wire electrode 2 and a processing region around said electrode.

Description

[Detailed description of the invention] (1) Technical field of the invention The present invention relates to a wire cut electrical discharge machining method.

In particular, the present invention relates to an improvement in a wire-cut electric discharge machining method using a wire-cut electric discharge machine having a box-shaped splash guard with an open upper edge.

(2) Background of the technology The wire-cut electrical discharge machining method is a method that uses a wire-cut electrical discharge machine to process a conductive workpiece such as metal and a conductive material such as brass that is stretched linearly through the workpiece. Intermittent electrical discharge is generated in the machining liquid injected into the gap between the wire electrode and the workpiece, which softens or melts the machining area of the workpiece extremely locally, and causes intermittent changes in pressure near the machining area. A method of processing conductive materials, particularly metals, in which the softened or melted region of the workpiece is peeled off and removed by intermittent changes in pressure.

In the wire-cut electrical discharge machining method using a wire-cut electrical discharge machine, it is essential that electrical discharge occurs in a machining fluid, and it is also necessary to constantly remove cutting debris from the machining area using this machining fluid. Therefore, it is necessary that the machining fluid continues to flow into the machining area during the machining period.

Conventionally, the pressure of this machining fluid jet was about 0.1 Kg/c2, but this jet bounced off the surface of the workpiece and a large amount of machining fluid was splashed outside the machining tank. , the problem of water getting wet near the electrical discharge machine. Therefore, in the prior art, a transparent material, mainly a plastic material, assembled along the outer wall of the processing tank.
A splash guard was installed to prevent machining fluid from scattering.

However, as shown in FIG. 1, the wire-cut electrical discharge machine has a processing area (a region cut into a groove shape in the workpiece indicated by 7 in the figure).

Since the processing wire electrode 2 extends downward from the processing electrode head l located above, the splash guard should be set at -1.
- It is difficult to completely cover the processing area with a box shape with a lid. Therefore, the four plate-like members 3.3°, 3"
3° and 3°° were assembled along the outer wall of the processing tank 4 as shown in the figure and used as an open box-shaped splash guard. In addition, in the figure, 5 is the rad l to the electrode.
6 is a support frame that supports the workpiece 7.

(3) Conventional technology and problems However, it has recently been found that increasing the pressure of the machining fluid jet can increase the machining speed by 0.3 to 0.
．． It has become common to use a pressure of about 5 kg/cm2. As this pressure increases, the degree of adverse effects caused by the splashing of machining fluid further increases, and it has become clear that the brush guard in the prior art does not necessarily exhibit a satisfactory effect. Specifically, it has been recognized that, particularly in the early stages of machining, there is a great deal of splashing of machining fluid, and the adverse effects of water wetting are significant, which is a serious drawback from an operational standpoint.

(4) Purpose of the Invention The purpose of the present invention is to eliminate this drawback, and to provide a simple method for wire-cut electrical discharge machining using a wire-cut electrical discharge machine even when the injection pressure of machining fluid is high. An object of the present invention is to provide a wire-cut electrical discharge machining method that can prevent machining liquid droplets from scattering.

(5) Structure of the Invention A characteristic structure of the present invention is a wire-cut electric discharge machining method using an electric discharge machine having a splash guard made of a plate-like member arranged surrounding a machining area. A removable second splash guard made of a plate member having smaller dimensions than the second splash guard is arranged in the area surrounded by the second splash guard.
Electric discharge machining is performed in a state where the machining area is more completely surrounded by the brush guard.

It is practically advantageous that the second splash guard according to the subject matter of the invention can be self-supporting. It can be placed on the support frame that supports the workpiece, or on the workpiece if the two surfaces of the workpiece are flat, and can locally cover the processing area. It is. Furthermore, since this second splash guard will be disposed surrounding the processing area, that is, the area where the wire electrode and the workpiece come into contact, its shape will be similar to the side surface as shown in Fig. 2. It is necessary that an opening can be formed in a part of the opening. Therefore, figure (
A U-shaped device with a permanent opening on a part of the side, such as 31 shown in a), is simple, but two L-shaped devices, such as 32 shown in figure (b), are used in combination. You can also. Furthermore, there are box-shaped members without a top lid, such as 33 shown in Figure (C), which have an opening only in a very narrow area on one side, and box-shaped members without a top lid, such as 34 shown in Figure (d). It is also possible to use one side of the member that can be opened and closed.

It is clear that the products shown in Figures (b), (C), and (d) are more effective in preventing the scattering of machining fluid than the product shown in Figure (a). It goes without saying that these are appropriately selected depending on the shape and size of the workpiece, the pressure of the machining fluid jet, and the like.

Also, the location where this second splash guard is placed is
2, it may be placed on the support frame 6 (see Figure 1) that supports the workpiece, or the upper surface of the workpiece 7 (see Figure 1) is flat and its area is If it is relatively large, it may be placed on top of the workpiece 7. Furthermore, it goes without saying that the second brush guard is disposed at a position surrounding the above-mentioned machining area at the beginning of machining when the splashing of machining liquid is particularly intense, but depending on the conditions of the machining path, during the machining period. When the second splash guard does not interfere with the movement of the electrode head, it is desirable that the second splash guard be disposed at a position surrounding the processing area throughout the processing period. Furthermore, even if the second splash guard collides with the electrode head during processing, as long as the weight of the second splash guard is not excessive, the electrode head will continue to press against the second splash guard. Even in this case, it is possible to use the second splash guard throughout the machining period to prevent the machining fluid from scattering, and in many cases, “Process”-
There is no disadvantage at all.

The material of the second splash guard is not particularly limited, but it is practical to use the same transparent plastic material as the material mainly used for the original splash guard. . Further, since the dimensions of the second brush guard are relatively small, there is no particular need for it to be assembled. For the same reason, there is no disadvantage in terms of storage when not in use.

(6) Embodiments of the Invention A machining method using a second splash guard, which is the gist of a wire-cut electric discharge machining method according to an embodiment of the present invention, will be explained below with reference to the drawings, and the present invention The structure and unique effects of the system will be clarified.

Refer to FIG. 3 In FIG. 3, the second splash guard 34 shown in FIG. It is a conceptual perspective view of the electric discharge machining state which is enclosed. In the figure, 1.2.3.3
degrees, 3 degrees, 31 degrees, 4, and 5 are the same as those shown in the diagram (FIG. 1) used to explain the wire-cut electric discharge machine according to the prior art. When the pressure of the machining fluid jet is increased, especially in the early stages of machining when there is a great deal of splattering of machining fluid, the second splash guard is installed to locally cover the wire electrode 2 and the machining area around it, as shown in the figure. By arranging 34 and performing processing, it becomes possible to effectively prevent the scattering of processing liquid droplets. In addition, after the initial machining is completed when there is a lot of splashing, the second
When the second splash guard 34 is in the machining path that does not impede the movement of the rad 1 to the electrode, it is sufficient to keep the second splash guard 34 as it is; If the machining path obstructs the movement of l, it can be removed. Also, the electrode head 1
There is no need to remove the second splash guard 34 when the second splash guard 34 can be pressed and moved with it.

It was confirmed that by the above process, even when the pressure of the machining fluid jet is relatively high, the scattering of machining fluid droplets can be effectively prevented by an extremely simple method, especially in the initial stage of machining.

(7) As described in detail, according to the present invention, in the wire-cut electrical discharge machining method using a wire-cut electrical discharge machine, even when the injection pressure of the machining fluid is high, the machining fluid can be removed by simple means. It is possible to provide a wire cut electric discharge machining method that can prevent the scattering of droplets.

[Brief explanation of the drawing]

FIG. 1 is a conceptual perspective view showing the machining state of wire-cut electrical discharge machining performed using a wire-cut electrical discharge machine in the prior art. 3 is a conceptual perspective view of a second splash guard, and FIG. 3 is a conceptual perspective view showing a machining state of a wire-cut electric discharge machining method according to an embodiment of the present invention. 1... Electrode head, 2. Φ wire electrode, 3.3
', 3゛°, 3°°°... Splash guard plate that originally exists in the prior art, 31.32.33.3
4 fists: a detachable second brush guard according to the gist of the present invention; 4: Φ processing tank; 5: column;
6... Workpiece support frame, 7... Workpiece. Patent applicant: Fanuc Co., Ltd. Agent Patent attorney: Makoto Samukawa −

Claims (1)

[Claims] In a wire-cut electric discharge machining method using a wire-cut electric discharge machine having a splash guard made of a plate-like member arranged so as to surround a machining area, the A wire-cut electric discharge machining method characterized in that a second splash guard is provided, which is made of a plate-shaped member and has smaller dimensions than the splash guard, so as to surround the machining area.