JP2553126Y2 - Electric discharge machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machine having a rotary table for rotating a workpiece in a fixed state.

[0002]

2. Description of the Related Art Conventionally, as this type of electric discharge machine, for example, a wire electric discharge machine is known as shown in Japanese Utility Model Laid-Open No. 2-97524.

That is, as shown in FIG. 3, a wire electric discharge machine comprises a wire electrode 48 and a machining tank 50 for storing a machining fluid.
A work base 54 for fixing the work 52 in the processing tank 50, a rotary table 56 projecting outward from the processing tank 50 and fixed to the work base 54;
And a processing power supply 58.

The rotary table 56 includes a housing 60
A worm 62 connected to a drive system such as a motor (not shown) provided outside the processing tank 50;
A worm wheel 64 meshing with the worm wheel 2 and one end thereof is connected to the worm wheel 64, and a main shaft 66 serving as a rotation center thereof
And a fixing portion 68 that fixes the work 52 and is connected to the other end of the main shaft 66, and a bearing 70 that receives the outer periphery of the main shaft 66.

[0005] A fixing portion 68 of the rotary table 56 is provided.
, A processing power supply 58 is connected via a positive power supply cable 72. The processing power source 58 is connected to the wire electrode 48 for processing the workpiece 52 and the negative power supply cable 74.
Connected through. Thus, the wire electrode 48 and the fixed portion 68 of the rotary table 56 are electrically connected to the processing power source 58.

Therefore, a current is supplied from the processing power supply 58 to the wire electrode 48 via the power supply cable 74 by the voltage applied from the processing power supply 58, and a potential difference is generated between the wire electrode 48 and the work 52, thereby causing discharge. A phenomenon occurs, and the work 52 is processed.

At the time of this processing, the work 52 fixed to the fixing part 68 is rotated.

[0008]

However, in such a conventional electric discharge machine, the rotary table 56 is not provided.
Further, since the positive power supply cable 72 is directly fixed, when the rotary table 56 is rotated, a load is applied to the fixed portion of the positive power supply cable 72. Therefore, the portion where the positive power supply cable 72 is fixed to the rotary table 56 is likely to be disconnected, and the work may be interrupted. Further, since the power supply cable 72 is also rotated together with the fixed portion 68, there is a problem that the rotation angle of the rotary table 56 is limited.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an electric discharge machine having a rotary table which supports a rotation of a workpiece without breaking a power supply cable. The purpose is to provide.

[0010]

In order to achieve this object, an electric discharge machine according to the present invention employs a process for machining a workpiece inside.
The processing tank has one end protruding outside the processing tank and
A rotating shaft connected to a driving source provided outside the tank,
A support portion formed at the other end of the shaft, and supported by the support portion;
And an electrode for processing the workpiece.
And the rotation by the drive source is reduced and transmitted to the rotation shaft.
Gear reduction mechanism and a processing power supply connected to the electrode
And a conductive portion provided at the one end of the rotating shaft,
It is slidably brought into contact with the conductive part, and
A connected conductor connected to a power supply to keep the workpiece energized
And the gear reduction mechanism is provided with the processing tank and the conductive member.
It is located at the place between the parts.

[0011]

In the electric discharge machine of the present invention having the above configuration,
The electric conductor is provided on the rotating shaft and slides the electric conductor, and the electric conductor carries out the processing of the workpiece by keeping the electric current flowing through the conductor . Also,
When processing a workpiece in multiple directions, the rotation of the drive source
Is transmitted to the rotating shaft via the gear reduction mechanism,
The energization is performed after the work is rotated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In the description, the configuration similar to that of the prior art will be omitted and the description will be omitted. As shown in FIG.
The wire electric discharge machine includes a wire electrode 10 and a machining tank 12.
, A work base 14, a processing power supply 16, a positive power supply cable 18, a negative power supply cable 20, and a rotary table 22.

The rotary table 22 is provided in the processing tank 12.
From the outside and the insulator 23
Through the work base 14 so as to be detachable.
Have been. The rotary table 22 includes a housing 24, a worm wheel 28 that meshes with the worm 26, a bearing 30, a conductive main shaft 32 supported by the housing 24 via the bearing 30, and one end of the main shaft 32. And a fixing portion 34 provided at the bottom.
The worm 26 and the worm wheel 28
Constitutes a gear reduction mechanism.

Further, the rotary table 22 is provided with an electric conductor 3 provided at the other end of the main shaft 32 opposite to the fixed portion 34.
6 and a power-supplied conductor 38 supported by the housing 24 by the fixing plate 37 and slidably in contact with the electric conductor 36.

The worm 26 and the worm wheel
Is sandwiched between the processing tank 12 and the conductor 36.
It is located in the place.

As shown in FIG. 2, the conductor 38 is
An insulating case 40 covering the whole; a sliding portion 42 movably held in the case 40 and brought into contact with the conductor 36; and a spring 44 for pressing the sliding portion 42 against the conductor 36. Consists of And, in the sliding portion 42,
Positive power cable 18 connected to power supply 16 for processing
Is fixed, that is, the power-supplied conductor 38 is connected to the processing power supply 16 via the positive power supply cable 18.

The wire electrode 10 is connected to a processing power supply 16 by a negative power supply cable 20. In this way, the processing power supply 16 includes the positive power supply cable 18, the power-supplied conductor 38, the conductor 36, the main shaft 32,
And is connected to the work 46 via. Therefore, the wire electrode 10 and the work 4
6 are electrically connected.

In this manner, the work 46 is fixed to the fixed portion 34 of the rotary table 22 and provided outside the processing tank 12.
Motor rotation as a drive source (not shown)
The main shaft 32 is rotated via the worm wheel 26 and the worm wheel 28
By doing so, it is possible to freely rotate the fixing portion 34
it can. During processing, even if the conductor 36 rotates freely,
The sliding portion 42 comes into contact with the conductor 36 and slides.

The rotary table 22 is connected to an insulator 23.
By fixing the bearing 30 to the work base 14 via the power supply 16, seizure of the bearing 30 receiving the main shaft 32 and electric corrosion are prevented.

The conductor 38 is brought into contact with the outer peripheral portion of the conductor 36, in addition to the side end surface of the conductor 36,
A recess may be formed in the conductive portion 36 to make contact therewith.

In this embodiment, the gear reduction mechanism is used.
Using the worm 26 and the worm wheel 28
However, other gears, such as spur gears, may be used.

[0023]

[Effects of the Invention] As is apparent from the above description, the electric discharge machine of the present invention has no limitation on the rotation of the workpiece, and removes and attaches the workpiece every time the machining surface changes. It eliminates the need for adjustment, allows efficient and quick multi-faceted work on the workpiece, and also enables maintenance of the rotary table from the part protruding outside, making it easier to maintain the EDM. It has.

Further , the conductive portion is processed for the gear reduction mechanism.
Since it is located at the end opposite to the tank,
Can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a sectional view of the electric discharge machine of the present invention.

FIG. 2 is an enlarged sectional view of a conductor of the electric discharge machine of the present invention.

FIG. 3 is a sectional view of a conventional electric discharge machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wire electrode 12 Processing tank 14 Work base 16 Power supply for processing 18 Positive power supply cable 20 Negative power supply cable 30 Bearing 32 Main shaft 34 Fixed part 36 Conductor 38 Power conductor 46 Work

Claims (1)

(57) [Scope of request for utility model registration] 1. A processing tank for processing a workpiece inside, and one end protruding outside the processing tank and provided outside the processing tank.
A rotating shaft connected with the driving source is a supporting portion formed at the other end of the rotary shaft, the electric discharge machine wherein the supported by the support portion and a electrode for machining a workpiece, said drive Reduce the rotation of the source and transmit it to the rotating shaft
A gear reduction mechanism, a processing power supply connected to the electrode, a conductive portion provided at the one end of the rotating shaft, and slidably contacting the conductive portion and connected to the processing power source. And a power conductor that keeps the workpiece energized , wherein the gear reduction mechanism is sandwiched between the processing tank and the conductive portion.
An electric discharge machine, wherein the electric discharge machine is arranged at a position where the electric discharge machine is located.