JPH0570831U - Electric discharge machine - Google Patents

Abstract

(57) [Summary] [Purpose] When processing a workpiece with rotation, the time required to change the processing surface by removing the workpiece from the fixed part by eliminating the rotation limitation of the workpiece To shorten and process quickly. [Structure] A machining power source 16 and a workpiece 46 kept in an electrically conductive state are fixed via a main shaft 32 and an electric conductor 38 slidably attached to an electric conductor 36 provided on the main shaft. While being fixed to the portion 34, the electric discharge machining is performed by the wire electrode 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric discharge machine having a rotary table that rotates a workpiece in a fixed state.

[0002]

[Prior Art]

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

That is, as shown in FIG. 3, the wire electric discharge machine includes a machining tank 50 for storing a wire electrode 48 and a machining liquid, a work base 54 for fixing a work 52 in the machining tank 50, and a machining tank 50. It has a rotary table 56 protruding outward and fixed to the work base 54, and a power supply 58 for processing.

The rotary table 56 has a housing 60, a worm 62 (not shown) connected to a drive system such as a motor, a worm wheel 64 meshing with the worm 62, and one end connected to the worm wheel 64 to rotate the rotary table 56. It is composed of a main shaft 66 which is the center, a fixing portion 68 which fixes the work 52 and is connected to the other end of the main shaft 66, and a bearing 70 which receives the outer periphery of the main shaft 66.

Further, a processing power source 58 is connected to the fixed portion 68 of the rotary table 56 via a positive power supply cable 72. The processing power source 58 is also connected to the wire electrode 48 for processing the workpiece 52 via the negative power supply cable 74. Thus, the machining power source 58 is electrically connected to the wire electrode 48 and the fixed portion 68 of the rotary table 56.

Therefore, a voltage applied from the machining power source 58 supplies a current to the wire electrode 48 from the machining power source 58 through the power supply cable 74, and a potential difference is generated between the wire electrode 48 and the work 52 to cause discharge. A phenomenon occurs and the work 52 is processed.

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

[0008]

[Problems to be solved by the device]

 However, in such a conventional electric discharge machine, since the positive electrode power feeding cable 72 is directly fixed to the rotary table 56, when the rotary table 56 is rotated, a load is applied to the fixed portion of the positive electrode power feeding cable 72. Takes. Therefore, the portion where the positive electrode power supply cable 72 is fixed to the rotary table 56 is likely to be broken, 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.

The present invention has been made in order to solve the above-mentioned problems, and there is no disconnection of a power supply cable, and an electric discharge machining having a rotary table that freely supports the rotation of a workpiece. The purpose is to provide a machine.

[0010]

[Means for Solving the Problems]

 In order to achieve this object, the electric discharge machine of the present invention is equipped with an electric conduction part provided at one end of a rotary shaft protruding outside the machining tank and slidably abutted on the electric conduction part. And a conductor to be connected to a power source.

[0011]

[Action]

 In the electric discharge machine of the present invention having the above structure, the electric conductor is provided on the rotating shaft, and the electric conductor is slid so that the electric conductor energizes the work piece through the electric conductor. Keep on.

[0012]

Embodiment An embodiment embodying the present invention will be described below with reference to the drawings.

In the description, the same structure as the conventional technique will be omitted and will be described. As shown in FIG. 1, the wire electric discharge machine includes a wire electrode 10, a machining tank 12, and a work base 14. , A power supply 16 for processing, a positive power supply cable 18, a negative power supply cable 20, and a rotary table 22.

The rotary table 22 projects outward from the processing tank 12 and is detachably fixed to the work base 14 via an insulator 23 unlike the conventional one. 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 a main shaft 32. And a fixing portion 34 provided at one end of the. Further, the rotary table 22 is supported by the housing 24 by an electric conductor 36 provided at the other end of the main shaft 32 opposite to the fixed portion 34 and a fixed plate 37, and slides on the electric conductor 36. The electric conductor 38 is in contact with the electric conductor 38 so as to be possible.

As shown in FIG. 2, the electric conductor 38 has an insulating case 40 that entirely covers the electric conductor 38, and a sliding portion that is movably held in the case 40 and is in contact with the electric conductor 36. 42 and a spring 44 that presses the sliding portion 42 against the electric conductor 36. The positive power supply cable 18 connected to the processing power supply 16 is fixed to the sliding portion 42, that is, the conductor 38 is connected to the processing power supply 16 via the positive power supply cable 18. To be done.

Further, the wire electrode 10 is connected to the processing power supply 16 by the negative power supply cable 20. In this way, the processing power supply 16 is connected to the work 46 via the positive power supply cable 18, the conductor 38, the conductor 36, the main shaft 32, and the fixing portion 34. Therefore, the wire electrode 10 and the work 46 are electrically connected to the processing power supply 16.

In this way, the workpiece 46 is fixed to the fixed portion 34 of the rotary table 22, the fixed portion 34 is freely rotated, and the workpiece 46 is processed. During processing, even if the electric conductor 36 freely rotates, the sliding portion 42 abuts on the electric conductor 36 and slides.

Further, by fixing the rotary table 22 to the work base 14 via the insulator 23, it is possible to prevent seizure and electrolytic corrosion of the bearing 30 receiving the spindle 32 due to the current from the machining power supply 16. I'm out.

The conductor 38 may be brought into contact with the outer peripheral portion of the conductor 36, or may be brought into contact with the side end surface of the conductor 36, or a recess may be formed in the conductor portion 36 to be brought into contact therewith. Good.

[0020]

[Effect of the device]

 As is clear from the above description, the electric discharge machine of the present invention does not limit the rotation of the work piece, and does not require removal, installation or adjustment of the work piece each time the machining surface changes. In addition to being able to perform multifaceted work on the work piece efficiently and quickly, it also has the effect of facilitating maintenance of the electric discharge machine by performing maintenance of the rotary table from the part protruding to the outside. is there.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of an electric 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]

 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 Spindle 34 Fixed Part 36 Conductor 38 Electric Conductor 46 Workpiece

Claims (1)

[Scope of utility model registration request] 1. A processing tank for internally processing a workpiece, a rotary shaft having one end protruding outside the processing tank, a support portion formed at the other end of the rotary shaft, and a support portion supported by the support portion. In an electric discharge machine comprising an electrode for machining the processed workpiece, a machining power source connected to the electrode, an electrically conductive portion provided at the one end of the rotating shaft, and slidable on the electrically conductive portion. An electric discharge machine which is brought into contact with the workpiece and is connected to the machining power source to keep the workpiece in an energized state.