JPS6284927A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To eliminate oscillation of an electrode and perform high precision machining by employing a longer support-guide length by means of two or more guide nozzles arranged coaxially in succession. CONSTITUTION:A holder 13 installed in a recess of a holder 12 has in its central part a fixed guide nozzle 14. A guide nozzle 8 fixed in the holder 12 and the guide nozzle 14 are arranged coaxially in succession. Accordingly, a thin and long electrode 7 is fed out without causing oscillation while being guided by the two guide nozzles 14 and 8 fixed via respective holders 12 and 13 to a holding member 11 to machine a hole. Thus, the electrode is prevented from oscillating and becomes more rigid to perform high precision machining with stabilized electrode movement.

Description

Detailed Description of the Invention: (Industrial Application MF E) This research is based on an electrical discharge machining device that confronts an electrode held by a guide with a workpiece, and performs machining by passing current between the two;
In particular, it concerns the guiding and holding structure of the electrode.

[Conventional technology]

Here, an outline of the electric discharge machining apparatus will be explained with reference to FIGS. 2 to 4.

The electrical discharge machining device has a servo head (2) with an electrode (1) attached.
and the processing tank (3) located below this servo head (2).
), and the processing tank (3) contains a table (4) and a workpiece (5) fixed on the table (4).
), and further a machining liquid (6) that completely submerges the workpiece (5).
are arranged. The processing is performed sequentially as shown in Figures 1 to 3. First, the workpiece (5) is fixed on the table (4), and then the processing tank (3) is The inside is filled with machining fluid F61 (see Figure 1).Then, the servo head (2) descends, and the electrode (1) attached to the lower end of the servo head (2) and the tilt pull (4)
Electric discharge is started between the workpiece (5) fixed above, and a predetermined amount of machining is performed (see FIG. 2). After this machining is completed, the servo head (2) rises, and the machining fluid (6) in the machining tank (3) is drained after the ascent ends (see Figure 3).
.

When machining a hole using an elongated electrode (7) in such an electrical discharge machining device, if the machining is performed in that state, the elongated electrode (7) is weak and the hole may be drilled diagonally.
When the elongated electrode (7) is rotated, it swings out and creates a hole that is larger than necessary, and the amount of processing per unit time is reduced.

Therefore, the precision of the machined hole is generally maintained by guiding the elongated If pole (7) using a guide nozzle provided near the workpiece (5).

A conventionally used such device is shown in FIG.

A conventional electrode guiding and holding structure includes an electrode fixture (9) attached to a servo head (2) as shown in Fig. 5.
An elongated electrode (7) is attached to. Further, a holder (12) is attached to the holder holder (11) supported by the machine body a, and a guide nozzle (8) is attached to the holder (12), and the center of the hole of this guide nozzle (8) is The workpiece (5) placed on the workpiece table (13) is aligned with the center of the elongated electrode (7).
It is fixed so that it comes close.

In this device, the guide nozzle (8) has a hole in the elongated electrode (
7) was supposed to guide and hold the elongated electrode (7).

[Problem that the invention seeks to solve]

In the conventional device, only one guide nozzle is provided, and the guide holding part is short.It would be better to manufacture a long guide nozzle (8), but there are problems such as difficulty in manufacturing it with high precision. was there.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrical discharge machining apparatus that can improve the precision of machined holes more than ever before.

[Means for solving problems]

The electric discharge machining apparatus according to the present invention is held near a workpiece,
This is a stack of two or more guide nozzles that guide the electrodes.

[Effect]

In the present invention, since the guide nozzles are stacked in two or more stages, the holding/guiding portion of the elongated electrode can be made long. Therefore, the electrode is held vertically and will not be damaged during rotation.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
The figure is an explanatory diagram of an electrode holding structure of an electrical discharge machining apparatus according to an embodiment of the present invention. In the figure, the same reference numerals as in FIGS. 2 to 5 are the same, and the explanation thereof will be omitted.

In Figure 1, (13) is a holder;
2), and a guide nozzle (14) is fixed to the center of the holder (13). This guide nozzle (14) and the guide nozzle (8) fixed to the holder (12) are arranged coaxially.

Hole processing is performed while the elongated electrode (7) is guided and sent out by two nozzles, a guide nozzle (14) and a guide nozzle (8).

In addition, although the above-mentioned example explained the case where two stages of guide nozzles were provided, it may be made to overlap three stages, four stages, or more. In particular, it is necessary to increase the guide length in accordance with the thinness of the electrode, so in that case, the number of guide nozzle stages may be increased in proportion to the thinness of the electrode.

Furthermore, it goes without saying that the apparatus according to the present invention can be applied not only to hole machining but also to other machining operations.

〔Effect of the invention〕

As described above, according to the present invention, the guide nozzles are stacked in two or more stages to increase the supporting and guiding length of the electrode, which eliminates the vibration of the electrode, strengthens the body, and stabilizes the movement of the electrode. This has the effect of providing highly accurate machining.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an electrode holding structure of an electric discharge machining apparatus according to an embodiment of the present invention, FIGS. 2 to 4 are cross-sectional explanatory diagrams showing an outline of the electric discharge machining apparatus according to the machining order, and FIG. is an explanatory diagram of a conventional electrode holding structure. (81, (14)・Guide nozzle, (12), (13)
) holder. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Patent Attorney Tadashi Sato Year 1 Figure 12.13: /↑\1 Shigu Figure 4 Bribe Figure 5

Claims (1)

[Claims] An electrical discharge machining device that places a machining electrode and a workpiece facing each other and applies current to the machining gap between them for machining, and is characterized by having two or more stacked guide nozzles that are held near the workpiece and guide the electrode. electrical discharge machining equipment.