JPH03245922A - Electric discharge machining device - Google Patents

Abstract

PURPOSE:To optimumly discharge the working chips and always carry out stable work by installing a means for selecting the injection direction of the working liquid jetted from the working liquid injection hole of a working liquid feeding means according to the proceeding direction in the electric discharge machining and obtain an optimum working liquid injection direction. CONSTITUTION:The injection direction of the working liquid which is jetted from the working liquid injection hole 5 of a working liquid feeding means 2 installed in a working tank 1 is selected according to the process direction of the electric discharge machining. Accordingly, the working chips can be always discharged in an optimum state, and electric discharge is stabilized, and the working speed can be increased, by jetting the working liquid according to the processing direction in the electric discharge machining.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electric discharge machining apparatus, and particularly to an electric discharge machining apparatus equipped with a machining liquid supply means for supplying machining liquid into a machining tank.

[Prior art] Figures 11 and 12 are 1, for example, Japanese Patent Application Laid-Open No. 63-2838.
11 is a plan view and FIG. 12 is a front sectional view. FIG.

In the figure, (1) is a machining tank, (2) is a machining fluid supply means whose enlarged view is shown in FIG. 13, (3) is a tool electrode, and (4)
) denotes the workpiece, and (5) denotes machining fluid jetting holes formed at equal intervals in the machining fluid supply means (2), which are connected to the machining fluid jetting amount control valve (7) via the coupler (6). .In addition, (8
) is a machining fluid supply block equipped with a coupler (6), (9
) is a pump.

In addition, (10) is a slider (1) that adjusts the liquid level of the machining fluid.
1) represents the outlet for overflowing machining fluid, (12) represents the flow of machining fluid from each jet hole (5), and (
13) represents the entire flow of machining fluid inside the machining tank (1).

Note that the machining fluid system piping is connected to a machining fluid processing device (not shown).

Next, the operation and effect of the above-mentioned conventional device will be explained.

When machining is performed by generating a submerged electrical discharge between the tool electrode (3) and the workpiece (4), it is necessary to remove the generated machining debris and keep the electrical discharge machining area in a clean state. In order to proceed with machining normally and quickly, clean machining fluid is supplied from the machining fluid supply means (2), and contaminated machining fluid containing machining waste is discharged through the discharge port (11). Processing liquid supply means (2)
The amount of machining fluid supplied from is controlled by a regulating valve (7). The machining fluid dyed with machining waste is cleaned by a machining fluid treatment device and then supplied to the machining fluid supply means (2) again. Therefore, the machining fluid is constantly circulating.

[Problem to be solved by the invention]

Conventional electrical discharge machining equipment is configured as described above, and the jetting direction of machining fluid is always constant. Therefore, it is not possible to always set the optimal jetting direction for the discharge machining gap, and the machining fluid jetting direction is always constant. If the ejection direction and the electrical discharge machining gap are at an inappropriate position/relationship, there is a problem that the ability to remove machining debris is reduced, machining becomes unstable, and machining speed decreases.

This invention was made in order to solve the above-mentioned problems, and aims to provide an electric discharge machining device that can always obtain the proper machining fluid jet direction with respect to the am machining gap. .

[Means to solve the problem]

The electrical discharge machining apparatus according to the present invention includes means for switching the direction of machining fluid spouted from the machining fluid spouting hole of the machining fluid supply means provided in the machining tank, depending on the direction of progress of electrical discharge machining. be.

[Function] Furthermore, in the electric discharge machining apparatus according to the present invention, machining fluid is ejected according to the direction of progress of electric discharge machining, so that machining debris can be discharged in an optimal state at all times, stabilizing electric discharge, and machining. speed increases.

[Embodiments of the invention]

Examples of the present invention will be described below.

Figures 1 and 2 are a plan view and a side view showing an embodiment of the present invention. In Figure 1, (2) is a machining fluid supply means, which is supplied to the machining tank (1) in four directions: front, rear, left, and right. installed. (20a) to (20dl are machining fluid control valves, which are independently connected to machining fluid supply means (2A) to (2D), respectively. (21) is a machining fluid control valve (20a)
~(20dl control device, (22) is a numerical control device, this numerical control device! (221 command, 1lil control device)
+ Control device (21) operates Lr machining fluid control valve (20a'l)
~[(20d) 0) Operate opening and closing respectively.

By the way, the following embodiment can be considered as the machining fluid supply means (2).

That is, FIGS. 3 and 4 show the first embodiment of the processing fluid supply means (2), where FIG. 3 is a plan view and No.
It is a sectional view taken along the line IV-rV in the figure.

In the machining fluid supply means (2) based on the first embodiment, a plurality of eight machining fluid injection holes (5) having the same diameter are arranged at irregular intervals, and the end farthest from the machining fluid supply side is Accordingly, the intervals at which the machining fluid ejection holes (5) are arranged become narrower.

Figures 5 and 6 show a second embodiment of the two machining fluid supply means (2). Figure 5 is a plan view, Figure 6 is V in Figure 5.
[-VT line sectional view.

The machining fluid supply means (2) based on this second embodiment have different areas. Several machining fluid ejection holes (5) are arranged at equal intervals, and the area of the machining fluid ejection holes (5) increases toward the end farther from the machining fluid supply side.

7 and 8 show a third embodiment of the machining fluid supply means (2), FIG. 7 is a plan view, and FIG. 8 is a
It is a sectional view taken along the line -■.

The machining fluid supply means (2) based on this third embodiment is provided with a cylindrical rectifying means (23) in the machining fluid ejection hole (5). The rectifying means (23) based on the third embodiment may be provided in the machining fluid spouting hole (5) of the machining fluid supply means (2) based on the first embodiment, or may be provided in the machining fluid spouting hole (5) of the machining fluid supply means (2) based on the first embodiment. It may be provided in the machining fluid ejection hole (5) of the machining fluid supply means (2) based on the above.

Further, FIG. 9 shows a fourth embodiment of the machining fluid supply means (2), which is a modification of the rectifying means (23) in the third embodiment explained in FIGS. 7 and 8. This is an example in which a machining fluid supply means (2) constituted by an assembly of a plurality of cylindrical bodies (24) is used instead of a plurality of machining fluid ejection holes (5).

Note that the machining fluid supply means (2) needs only to have strength enough to withstand the pressure of the machining fluid and resistance to the machining fluid, and although it is necessary to consider workability, etc., it is necessary to specifically limit the material. Next, the operation of each of the above-mentioned machining fluid supply means (2) will be explained. When high-pressure machining fluid is supplied from one end of the machining fluid supply means (2), which has a hole in the side wall of one cylindrical body as shown in Figure 13, friction loss due to the flow of machining fluid occurs. etc., a pressure gradient is created inside, and the pressure at the end far from the supply side is lower than that at the supply side. Therefore, if the machining fluid spout holes (5) with the same area are arranged at equal intervals, the machining fluid will not flow out at a uniform flow rate, and the machining fluid will not flow out of the machining tank (1) as shown by the arrow (step 3) in Fig. 11. The flow of machining fluid inside becomes vortex-like,
In the central part of the machining bath (1) where electrical discharge machining is most frequently performed, the machining fluid becomes stagnant and the removal performance of machining debris is significantly reduced. Therefore, by considering the pressure distribution within the machining fluid supply means, we arranged the machining fluid ejection holes (5) at irregular intervals as shown in Figs. 3 and 4, and If the area of the machining fluid jet hole (5) is varied depending on the position as shown in FIG. 6, the machining fluid can flow out at a uniform flow rate.

On the other hand, the flow of the machining fluid at the machining fluid ejection hole (5) must be changed at a predetermined angle, for example, at a right angle. However, as shown in Fig. 13, in the conventional machining fluid supply means (2), which has a structure of simply making a hole in the side wall of one cylindrical body, the machining fluid cannot bend at right angles due to inertia. Instead, it flows out at a certain angle. Therefore, as shown in FIGS. 7 and 8, if a rectifying means (23) of a length sufficient to obtain a sufficient flow of the machining fluid is provided at the tip of the machining fluid jet hole (5), the flow of the machining fluid will be reduced. can be flowed out at a predetermined angle, and the first
As shown by the arrow (13) in Figure 0, it is possible to create a flow of machining fluid that is uniform throughout the entire interior of the machining tank and has high performance in removing machining debris.

Further, as a development of the embodiment shown in FIGS. 7 and 8, instead of providing a rectifying means (23) at the end of the machining fluid jet hole (5), as shown in FIG. Means (2)
Even if it is configured as an assembly of cylindrical bodies (24), the same effect as provided by the rectifying means (23) shown in FIGS. 7 and 8 can be obtained.

In addition, in the third and fourth embodiments described above, the rectifying means (23)
Although the cylindrical bodies (24) have the same area and are arranged at regular intervals, the areas can be changed depending on the position or they can be arranged at unequal intervals as described above.

Moreover, the above-mentioned effect can be further enhanced by changing the orientation of the above-mentioned 8 machining fluid jet holes [5], the rectifying means (23), or the cylindrical body (24) depending on the position.

The electrical discharge machining apparatus according to this embodiment is constructed as described above, and its operation will be explained below.

Figures 1 and 2 illustrate a state in which electrical discharge machining is progressing in the +X direction, and the machining fluid supplied by the machining fluid supply pump (9) is controlled by commands from the numerical control device (22). Open the machining fluid control valve (20a) and turn on the machining fluid supply means (20a).
A) is ejected from the ejection hole (5) into the processing tank (1). Similarly, if the progress direction of electrical discharge machining is the -Y force direction, open the machining fluid control valve (20b) and the machining fluid supply means (
20B) The machining fluid is also spouted.

Also, if the direction of progress of electrical discharge machining is the ~X direction.

Open the machining fluid control valve (20c) and turn on the machining fluid supply means (20c).
Processing fluid is spouted from ε). Furthermore, when the progress direction of electrical discharge machining is the +Y direction, the machining fluid control valve (20 dl) is opened and machining fluid is spouted from the machining fluid supply means (2 [ID)].
let As a result, the direction in which the machining fluid is ejected can be changed in accordance with the direction of progress of electric discharge machining, making it possible to always optimally remove machining debris and stabilizing electric discharge machining.

In the above embodiment, the case where the machining fluid is spouted from each of the machining fluid supply means is illustrated and described.
Depending on the direction of progress of electrical discharge machining, machining fluid is ejected from a plurality of machining fluid supply means.

It is also possible to generate the ejecting direction of the synthesized machining fluid, and various design changes that achieve the same effects as the present invention are possible.

[Effects of the Invention 1] The electric discharge machining apparatus according to the present invention is equipped with a means for switching the spouting direction of the machining fluid spouted from the machining fluid supply means provided in the machining tank according to the advancing direction of the electric discharge machining.
The optimum machining fluid jet direction can be obtained, machining debris is optimally removed, and stable machining is possible. Therefore, it is possible to provide an electric discharge machining device with a high machining speed.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention, FIG. 2 is a partial side view of FIG. The figure is a diagram for explaining the flow of machining fluid, and Sections 11 to 13 are diagrams for explaining a conventional device. In the figure, (1) is a machining tank, (2) is a machining fluid supply means, and (5
) is a machining fluid ejection hole, f23+ is a rectifying means, (24) is a cylindrical body, and (21) is a control device. In Figure 1, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In an electrical discharge machining device that supplies machining fluid into a machining tank by a machining fluid supply means in which a machining fluid spouting hole is formed, the spouting direction of the machining fluid spouted from the machining fluid spouting hole of the machining fluid supplying means is set to An electrical discharge machining device characterized by comprising means for switching according to the direction of travel.