JPS5969225A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To simplify the adjustment operation of liquid level of working liquid, by arranging, in a working tank, a vertically movable overflow plate, and as well by fitting a positioning pin, resiliently into one of adjusting holes. CONSTITUTION:An overflow plate 34 is vertically movably supported on guide rails 32 attached on one side surface of a working tank 14 in an electric discharge machine, and is provided with a positioning pin 42 resiliently urged toward a positioning plate 38 by a spring 40 and is fitted into one of adjusting holes 36. The adjustment of liquid level of working liquid 20 is simply made such that the positioning pin 42 is pulled out and is fitted in a desired one of the adjusting holes 36.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electric discharge machining apparatus, particularly an electric discharge machining apparatus in which a machining electrode and a workpiece are opposed to each other in a machining fluid in a machining tank, and electric current is applied between the two to perform machining. It is something.

Here, we will give an overview of electrical discharge machining equipment that uses machining fluid.
This will be explained according to FIGS. 1 to 3.

The electric discharge machining device is formed of a servo head 12 with an electrode 10 attached thereto, and a machining tank 14 located below the servo head 12. Inside the machining tank 14, there is a table 16 and a machine fixed on the table 16. A workpiece 18 and a machining liquid 20 that completely submerges the workpiece 18 are provided.

The processing is performed sequentially as shown in FIGS. 1 to 3. That is, first, the workpiece 18 is placed on the table 1.
6, and then the machining tank 14 is filled with machining liquid 20 (see FIG. 1). Next, the servo head 12 descends, and electrical discharge is started between the electrode 10 attached to the lower end of the servo head 12 and the workpiece 18 fixed on the table 16, and a predetermined amount of machining is performed (see Fig. 2). reference). After this machining is completed, the servo head 12 rises, and after the ascent, the machining fluid 20 in the machining tank 14 is drained (see Figure 3).
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However, in such an electrical discharge machining device, the workpiece 18 must always be completely immersed in the machining fluid 20, and if too much machining fluid 20 is used, it takes time to supply and drain the machining fluid 20. This results in a decrease in the amount of processing per unit time.

Therefore, in general, a device for adjusting the liquid level of the machining fluid 2o is provided in the machining tank 14 so that the machining fluid 2o matches the height of the workpiece 18.
The liquid level was maintained at 0.

Such devices conventionally used are shown in FIGS. 4 to 6.

This device includes a vertical partition plate 22 provided in a part of the processing tank 14, a guide 24 fixed in the vertical direction of this partition plate 22, and an overflow metal 26 that moves up and down along the guide 24. This is what is being done. Also, the overflow metal 26 is fixed at a predetermined height using the partition plate 2.
2 is provided with a longitudinal long hole 28, and the overflow metal 26 is fixed to the partition plate 22 with a set screw 301C inserted into the long hole 28 from the opposite side to the overflow metal 26.

In this conventional device, in order to adjust the liquid level height of the machining fluid 20, loosen the set screw 30, move the overflow metal 26 to the desired height by visual measurement, and then tighten the set screw 30 to adjust the overflow metal. Not only is the extremely troublesome procedure of fixing 26 to the partition plate 22 required;
Because it is fixed with a set screw 30, it may come loose due to vibration or the like.

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to provide a machining tank that can easily adjust the height of the machining fluid and that does not change the height of the machining fluid during use. An object of the present invention is to provide an electrical discharge machining device.

In order to achieve the above object, the present invention provides an electric discharge machining apparatus in which a machining electrode and a workpiece face each other in a machining tank filled with a machining liquid, and the machining gap is energized to perform machining. In addition to providing an overflow plate that can freely move up and down along the guide rail, a positioning plate with a number of adjustment holes vertically bored in a position facing the guide rail is provided, and the adjustment holes are elastically inserted into the overflow plate. It is characterized by a pin that fits into the

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

The present invention is illustrated in FIGS. 7 to 9, and the same members as in FIGS. 1 to 6 are given the same reference numerals and their explanations will be omitted.

In this device, an overflow plate 34 is loosely mounted on a guide rail 32 provided along the vertical direction of a processing tank 14, and a positioning plate 38 is provided with a number of adjustment holes 36 vertically bored at a position facing the guide rail 32. is provided in the overflow plate 34, and the adjustment hole 36 is opened by the elastic force of the spring 40.
It is formed by fixing a guide tube 44 having a pin 42 fitted therein.

However, with this lever device, the liquid level of the machining fluid 20 can be adjusted by moving the overflow plate 34 to a desired height while pulling the pin 42 against the elastic force of the spring 40, then releasing the pin 42 and lifting the tip. This is done by inserting it into the adjustment hole 36. At this time, the machining fluid 20 flows out from the upper end of the overflow plate 34, and the liquid level is maintained at the height of the upper end of the overflow plate 34.

In the present invention, the level of the machining fluid 20 in the machining tank 14 can be adjusted by simply inserting and removing the pin 42, so the adjustment work is significantly simplified. Furthermore, the pin 42 is fitted into the x-aligning hole 36 by the elastic force of the spring 40, and the fitting will not come off due to vibration etc. Therefore, the height of the machining fluid 20 during machining will not change. etc. cannot occur.

As described above, the present invention not only significantly improves workability but also has excellent reliability and durability.

[Brief explanation of drawings]

Figures 1 to 3 are cross-sectional views showing an outline of electrical discharge machining according to the machining order, Figures 4 to 6 show a machining tank equipped with a conventional machining liquid level adjustment device, and Figure 4 is a planar view. 5 is a front view, FIG. 6 is a side view, FIGS. 7 to 9 show a machining fluid level adjusting device provided in a machining tank of an electric discharge machining apparatus according to the present invention, and FIG. A plan view, FIG. 8 is a front view, and FIG. 9 is a side view. Identical members in each figure are given the same reference numerals, 10 is an electrode, 14
18 is a processing tank, 18 is a workpiece, 20 is Kaloe liquid, 32 is a guide rail, 34 is an automatic flow plate, 36 is an adjustment hole, 38 is a positioning plate, and 42 is a pin. Agent Patent attorney Shin Kuzuno - (1 other person) Figure 4 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] +l) In an electrical discharge machining device that places a machining electrode and a workpiece facing each other in a machining tank filled with machining fluid and processes the machining gap by applying electricity, the machining tank has a machine that can freely move up and down along a guide rail. In addition to providing a suitable overflow plate,
An electric discharge machining apparatus characterized in that a positioning plate having a plurality of vertical adjustment holes is provided at a position facing the guide rail, and a pin that elastically fits into the adjustment holes is arranged on the overflow plate.