JP2000263332A - Electrode mounting head for electric discharge machine - Google Patents

Abstract

(57) [Problem] To perform machining with a small electrode and machining with a large electrode with high precision by using one electric discharge machine. An electrode indexing shaft (32) is supported on a head body (31) and connected to a servomotor (35) via a coupling (34). Electrode mounting plate 36 for mounting a small electrode on indexing shaft 32
Are fixed with bolts 37, an insulating plate 38 is interposed between the mounting plate 36 and the indexing shaft 32, and an insulating collar 39 is interposed between the mounting plate 36 and the bolt 37. An electrode mounting adapter 42 for mounting a large electrode is arranged around the electrode mounting plate 36, and is fixed to the head main body 31 with bolts 43. An insulating plate 45 is interposed between the adapter 42 and the head main body 31,
An insulating collar 46 is interposed between the adapter 42 and the bolt 43. The mounting plate 36 and the adapter 42 are connected to a discharge power source via the power supply brush 40 and the spring 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode mounting head for an electric discharge machine.

[0002]

2. Description of the Related Art FIG. 2 illustrates the overall structure of an electric discharge machine. A work table 3 on which a workpiece 2 is placed is fixed to a bed 1 of the electric discharge machine, and a machining tank 4 for immersing the workpiece 2 in a machining fluid is installed so as to be able to move up and down. The processing liquid 5 is pumped from the tank 6 by the pump 7, supplied to the processing tank 4 through the filter 8, the cooling device 9, and the passage 10, flows down from the overflow hole 11, and returns to the tank 6.

Further, a saddle 13 is provided on the bed 1 with a motor 1.
4, a column 16 is provided on the saddle 13 so as to be movable in the front-rear direction along a Y-axis guide 19 via a ball screw 18 by a motor 17. An electrode mounting head 20 is supported on the column 16 by a motor 21 via a ball screw 22 via a ball screw 22 so as to be vertically movable along a Z-axis guide 23, and an electrode 25 is mounted on the head 20 via a holder 24.

At the time of electric discharge machining, the machining tank 4 is raised, the workpiece 2 is immersed in the machining fluid, and the saddle 13, the column 16, and the electrode mounting head 20 are moved. In this state, a voltage of a discharge power supply is applied to the electrode 25, and a discharge is generated between the electrode 25 and the workpiece 2.
The surface is melted and removed. Further, at the time of setup, work such as replacing the work 2 and the electrode 25 is performed while the work tank 4 is lowered to expose the work 2 from the working fluid.

FIG. 3 shows the structure of a conventional electrode mounting head 20. An electrode indexing shaft 32 is rotatably supported by a bearing 33 on a main body 31 of the electrode mounting head 20, and an upper end thereof is connected to a servomotor 35 via a coupling 34. An electrode mounting plate 36 is fixed to the lower end surface of the electrode indexing shaft 32 with bolts 37, an insulating plate 38 is interposed between the mounting plate 36 and the indexing shaft 32, and An insulating collar 39 is interposed between the first and second members 37. The power supply brush 40 comes into contact with the electrode mounting plate 36, and discharge power is supplied to the power supply brush 40 from a discharge power supply (not shown).

According to the electrode mounting head 20 having the above structure,
The electrode 25 can be indexed to a required angular position by rotating the electrode indexing shaft 32 and the electrode mounting plate 36 integrally by the servomotor 35. However, the mass and moment of inertia of the electrode 25 that can be mounted on the electrode mounting plate 36 are limited by the rigidity of the electrode support mechanism including the bearing 33, the coupling 34, and the servomotor 35. Usually, the electrode 25 for performing the rotation indexing is relatively small and has a small mass and a small moment of inertia. Therefore, in the conventional electrode mounting head 20, the rigidity of the electrode support mechanism is set to be relatively low in accordance with the small electrode 25. Was.

[0007]

However, even in this type of electric discharge machine having an indexing function, a large electrode 25 may be required depending on the type of the workpiece. As the size of the electrode 25 increases, the reaction force generated between the electrode 25 and the workpiece 2 during processing also increases. Therefore, in order to ensure a specified gap between the two, it is necessary to increase the support rigidity of the electrode 25. is there. However, the conventional electrode mounting head 20
According to this, since the supporting rigidity is set low for a small electrode, when a large electrode is attached to the electrode mounting plate 36, the processing reaction force cannot be suppressed, and the processing accuracy may be reduced. For this reason, when processing with a large electrode,
It was necessary to use another electric discharge machine without the rotation indexing function.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrode mounting head that can perform both small-electrode machining and large-electrode machining with a single electric discharge machine with high precision.

[0009]

In order to solve the above-mentioned problems, an electrode mounting head of an electric discharge machine according to the present invention has an electrode indexing shaft rotatably supported on a head body and an end surface of the electrode indexing shaft. The electrode mounting plate is fixed via an insulating material, the electrode mounting adapter is arranged around the electrode mounting plate, the electrode mounting adapter is fixed to the head body via the insulating material, and the power is supplied to the electrode mounting plate and the electrode mounting adapter. It is characterized by being connected to a discharge power supply via a member.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 illustrates the configuration of an electrode mounting head of an electric discharge machine according to the present invention, and the overall configuration of the electric discharge machine is as shown in FIG.

An electrode indexing shaft 32 is rotatably supported on a main body 31 of the electrode mounting head 20 by a bearing 33, and an upper end thereof is connected to a servomotor 35 via a coupling 34. An electrode mounting plate 36 for mounting a relatively small electrode 25 is provided on the lower end surface of the electrode indexing shaft 32 with a bolt 3.
It is fixed at 7. An insulating plate 38 is interposed between the electrode mounting plate 36 and the indexing shaft 32, and an insulating collar 39 is interposed between the electrode mounting plate 36 and the bolt 37.

An electrode mounting adapter 42 for mounting a relatively large electrode 25 is disposed around the electrode mounting plate 36, and is fixed to a lower end surface of the head main body 31 by bolts 43. The adapter 42 is connected to the electrode mounting plate 36.
It is formed in an annular shape with a larger diameter, and a plurality of tap holes 44 for attaching electrodes are provided. Electrode mounting adapter 42
An insulating plate 45 is interposed between the head body 31 and the head body 31, and an insulating collar 46 is interposed between the electrode mounting adapter 42 and the bolt 43.

A power supply brush 40 is provided on the outer periphery of the electrode mounting plate 36.
And a spring 48 for pressing the power supply brush 40 against the electrode mounting plate 36 is provided on the inner periphery of the electrode mounting adapter 42. The electrode mounting plate 36 and the electrode mounting adapter 42 are connected to a discharge power source (not shown) via a power supply brush 40 and a spring 48. The thickness of the insulating plate 45 is appropriately adjusted so that the lower end surface of the electrode mounting adapter 42 is parallel to the upper surface of the table 3 and the X-Y moving surface of the electrode mounting head 20. I have.

In the electrode mounting head 20 having the above configuration,
When using a relatively small electrode 25 for performing rotation indexing, this is fixed to an electrode mounting plate 36 and a servo motor 35
Can be accurately determined to the required angular position. When a large electrode 25 that does not require rotation indexing is used, the electrode 25 is fixed to the electrode mounting adapter 42 and supported by the high rigidity of the head main body 31, so that the processing reaction force is suppressed and the electrode 25 A prescribed gap can be secured between the workpiece and the workpiece 2. Therefore, according to the electrode mounting head 20 of this embodiment, processing with a small electrode and processing with a large electrode can both be performed with high precision using a single electric discharge machine.

The present invention is not limited to the above embodiment, but may be embodied by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention.

[0016]

As described in detail above, according to the electrode mounting head of the present invention, the electrode mounting adapter is provided around the electrode mounting plate and is fixed to the head body via the insulating material. With this electric discharge machine, there is an excellent effect that both machining with a small electrode and machining with a large electrode can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electrode mounting head showing one embodiment of the present invention.

FIG. 2 is a schematic diagram showing the overall configuration of the electric discharge machine.

FIG. 3 is a sectional view showing a conventional electrode mounting head.

[Explanation of symbols]

1. Bed, 2. Workpiece, 3. Work table,
4 processing tank, 13 saddle, 16 column, 20
..Electrode mounting head, 25..electrode, 31..head body, 32..electrode indexing shaft, 35..servomotor, 36
..Electrode mounting plate, 37,43..Bolt, 38,45.
-Insulating plate, 39, 46-Insulating collar, 40-Power supply brush, 42-Electrode mounting adapter, 48-Spring.

Claims (1)

[Claims] An electrode indexing shaft is rotatably supported on a head body, an electrode mounting plate is fixed to an end surface of the electrode indexing shaft via an insulating material, and an electrode mounting adapter is arranged around the electrode mounting plate. An electrode mounting head of an electric discharge machine, wherein an electrode mounting adapter is fixed to a head body via an insulating material, and the electrode mounting plate and the electrode mounting adapter are connected to a discharge power supply via a power supply member.