JP6633594B2 - Rotating shaft device and electric discharge machine equipped with the rotating shaft device - Google Patents

Description

  The present invention relates to a rotating shaft device and an electric discharge machine provided with the rotating shaft device.

  FIG. 6 is a schematic view showing a cross section of a conventional rotary shaft device used for an electric discharge machine or the like. As shown in FIG. 6, the power unit 2 and the speed reducer 3 are disposed inside the housing 1 of the rotating shaft (rotating shaft device) 24. The speed reducer 3 is a device that reduces the rotation of the power unit 2. A bearing support 7 is provided on the front end side of the housing 1, and the bearing 4 is supported by the bearing support 7. A shaft 5 and a rotary table 6 are fixed to both sides of the bearing 4, and the shaft 5 and the rotary table 6 can rotate freely in synchronization with the rotation of the speed reducer 3. A seal mechanism 8 is provided near the bearing support 7, and a seal member 9 is provided inside the seal mechanism 8. The sealing material 9 is in contact with the outer peripheral surface of the rotary table 6 to prevent the working fluid from the gap 11 between the seal mechanism 8 and the rotary table 6 from entering the housing 1.

JP 2011-104725 A Japanese Patent No. 5082569 Japanese Patent No. 4354773

  During machining of a workpiece by an electric discharge machine, machining waste called sludge is generated and floats in a machining fluid in a machining tank. As shown in the flow 18 of the working fluid containing sludge, when the working fluid containing sludge enters the gap 11, the sludge adheres between the seal material 9 and the rotary table 6. For this reason, wear of the sealing material 9 is caused at an early stage. It is to be noted that a seal mechanism of a general rotating shaft using an air seal structure or a labyrinth structure is disclosed (see Patent Documents 1 and 2).

  A rotary shaft device used for an electric discharge machine is installed on a work table arranged in a processing tank filled with a working fluid, and a workpiece is fixed to the rotary shaft table for use. A seal mechanism is provided in a gap between the rotating shaft main body and the rotating shaft table to prevent the working fluid in the processing tank from entering the inside of the rotating shaft (Patent Document 3). However, the sludge (fine metal powder) generated during processing flows into the sealing mechanism, thereby significantly deteriorating the sealing performance.

Therefore, an object of the present invention is to provide a rotating shaft device of an electric discharge machine capable of realizing a long life of sealing performance by providing a sludge intrusion prevention means in front of a sealing mechanism, and a discharge device having the rotating shaft device. It is to provide a processing machine.

The invention according to claim 1 of the present application provides a rotating shaft main body, a table rotating body that is rotatably supported by the rotating shaft main body, a driving unit for rotating the table rotating body, the rotating shaft main body and the table rotating body. A seal mechanism in which a seal material is disposed between the body, a first supply unit that supplies a clean fluid used for processing to the seal mechanism, and a clean supply used for processing from the seal mechanism. A discharge port for discharging a fluid, wherein the discharge port reduces a flow of a clean fluid used for the processing to the table rotating body. . For example, the pipeline 10 in FIG. 1 corresponds to the first supply unit.

The invention according to claim 2 is the rotary shaft device of the electric discharge machine according to claim 1, wherein the seal mechanism portion has a structure that can be divided from the rotary shaft main body.
The invention according to claim 3 is the rotary shaft device for an electric discharge machine according to claim 1 or 2, wherein a discharge port for a clean fluid used for the processing is provided in the seal mechanism. is there.

The invention according to claim 4 is the electric discharge machine according to any one of claims 1 to 3 , wherein a pipe for flowing a clean fluid used for the machining is provided in a sealing material of the sealing mechanism . It is a rotating shaft device.
According to a fifth aspect of the present invention, the rotary shaft device according to any one of the first to fourth aspects is provided in a processing tank, and the rotary shaft device is supplied to the first supply unit provided in the rotary shaft device. This is an electric discharge machine provided with a supply amount control means for controlling an amount of a clean fluid used for machining.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a rotary shaft device capable of realizing a long life of sealing performance by providing a sludge intrusion prevention means in front of a seal mechanism, and an electric discharge machine having the rotary shaft device.

It is a schematic diagram which shows the cross section of the rotary shaft apparatus provided with the clean processing liquid supply pipe. It is a schematic diagram which shows the cross section of the rotating shaft device provided with the auxiliary seal mechanism. It is a schematic diagram which shows the cross section of the rotary shaft device provided with the drain port. FIG. 4 is a schematic view showing a cross section of a rotary shaft device in which a pipe of a clean working liquid supply unit is provided in an auxiliary sealing material. FIG. 3 is a diagram illustrating a configuration of a release machine equipped with a rotating shaft device. It is a schematic diagram which shows the cross section of the conventional rotating shaft device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing a cross section of a rotary shaft device provided with a clean processing liquid supply pipe. As shown in FIG. 1, the housing 1 of the rotating shaft of the rotating shaft (rotating shaft device) 24 is configured to include a seal mechanism 8 and a bearing support 7. A power unit 2 and a speed reducer 3 which are driving units of the rotary table 6 are arranged inside the housing 1 of the rotating shaft. The speed reducer 3 is a device that reduces the rotation of the power unit 2. A bearing support 7 is provided at the tip of the housing 1 of the rotating shaft, and the bearing 4 is supported by the bearing support 7. A shaft 5 and a rotary table 6 are fixed to both sides of the bearing 4, and the shaft 5 and the rotary table 6 can rotate freely in synchronization with the rotation of the speed reducer 3. In FIG. 1, the shaft 5 is fixed to the bearing 4. The work is fixed to the rotary table 6 directly or via a jig.

  The turntable 6 is fixed to the shaft 5. A seal mechanism 8 is provided adjacent to the bearing support 7, and a seal member 9 is provided inside the seal mechanism 8. The sealing material 9 is, for example, an O-ring made of rubber. When the sealing material 9 comes into contact with the outer peripheral surface of the turntable 6, the processing liquid from the gap 11 between the seal mechanism unit 8 and the turntable 6 enters the housing 1. Prevents intrusion.

  Further, as shown in FIG. 1, a pipeline 10 for supplying a clean working liquid to the seal mechanism 8 inside the housing 1 is provided. The flow of the clean working fluid through the gap 11 between the seal mechanism 8 and the rotary table 6 prevents the working fluid containing sludge from contacting the sealing material 9. The clean working liquid is a liquid used when processing a workpiece by an electric discharge machine.

FIG. 2 is a schematic diagram showing a cross section of the rotary shaft device provided with the auxiliary seal mechanism 12. The housing 1 of the rotating shaft includes an auxiliary seal mechanism 12, a seal mechanism 8, and a bearing support 7.
In FIG. 2, an auxiliary seal mechanism 12 is provided outside the seal mechanism 8. Here, the term “outside” means the side on which the power unit 2 is disposed, as the inside, and the opposite side, and is the side of the rotating shaft of the rotating shaft device 24 close to the outside of the housing 1. In the housing 1 of the rotating shaft, an auxiliary seal member 13 is attached to the auxiliary seal mechanism 12, and the auxiliary seal member 13 is attached to the rotary table 6 so as to make a light contact or a small gap. .

  Between the seal mechanism 8 and the auxiliary seal mechanism 12, a space 14 between the seal mechanism and the auxiliary seal structure sandwiched between the seal material 9 and the auxiliary seal 13 is formed. By supplying a clean working fluid to the space 14 through the pipe 10, the flow 19 of the clean working fluid 19 from the space between the auxiliary seal member 13 and the rotary table 6 toward the outside from the housing 1 of the rotating shaft. Flows like so. For this reason, invasion of sludge can be reliably prevented. The amount of the clean working fluid to be supplied can be arbitrarily adjusted by the working fluid supply means 25 (see FIG. 5). For this reason, it is possible to temporarily increase the flow rate and remove sludge accumulated in the gap 11 between the auxiliary seal mechanism 12 and the turntable 6.

  Therefore, simple cleaning can be performed without the operator disassembling the mechanism. In addition, when it is not necessary to supply a clean processing liquid such as during processing stop, the supply of the clean processing liquid can be stopped. The seal mechanism unit 8 and the auxiliary seal mechanism unit 12 can be easily disassembled by adopting a structure that can be divided into the casing 1 of the rotating shaft, the seal mechanism unit 8, and the auxiliary seal mechanism unit 12. For this reason, the time required for cleaning or replacing the seal member 9 and the auxiliary seal member 13 can be significantly reduced.

  In FIG. 3, the flow of the processing liquid indicated by the arrow 19 can be changed to the flow of the processing liquid indicated by the arrow 26 by providing the discharge port 15 and the discharge tube 16 on the side surface of the seal mechanism 8. For this reason, it is possible to prevent the work and the rotary table 6 from being unnecessarily wet when the work is replaced.

  In FIG. 4, the pipe line 17 is provided in the auxiliary seal member 13, so that the sludge can be more reliably discharged. Although not shown in the drawing, the conduit 17 may be provided in the sealing material 9. At this time, the cross-sectional shape of the sealing material 9 and the auxiliary sealing material 13 may be not only a circular shape or a square shape but also other shapes.

  FIG. 5 is a diagram showing a configuration of an electric discharge machine equipped with a rotating shaft device. The rotating shaft (rotating shaft device) 24 is arranged in the processing tank 21 so that the rotating shaft direction of the rotating table 6 is vertical, horizontal, or another direction. The processing liquid containing the processing waste discharged from the processing tank 21 is stored in the sewage tank 23. The processing liquid stored in the sewage tank 23 is supplied to the fresh water tank 22 via a purification device (not shown). The working fluid stored in the fresh water tank 22 is a clean working fluid that has been purified by a purification device (not shown). The control device 20 controls the means for forming the rotating shaft device 24 (working fluid supply means 25), pumps up the purified working fluid from the fresh water tank 22, and supplies it to the rotating shaft device 24.

  In the above-described embodiment, the rotating shaft device 24 is applied to an electric discharge machine, and a clean working fluid from which machining chips are removed is supplied as a clean fluid to be supplied to the rotating shaft device 24. When providing the rotating shaft device 24 in addition to the electric discharge machine, it is preferable to use a machining fluid used in a machine tool.

DESCRIPTION OF SYMBOLS 1 Rotating shaft housing 2 Power part 3 Reduction gear 4 Bearing part 5 Shaft 6 Rotary table 7 Bearing support part 8 Seal mechanism part 9 Seal material 10 Pipe line of a seal mechanism part 11 Gap between a seal mechanism part and a rotary table 12 Auxiliary seal Mechanical section 13 Auxiliary seal material 14 Space between seal mechanism section and auxiliary seal mechanism section 15 Discharge port 16 Discharge tube 17 Pipe line provided in seal material or auxiliary seal material 18 Flow of processing fluid containing sludge 19 Clean Flow of processing fluid 20 Control device 21 Processing tank 22 Fresh water tank 23 Sewage tank 24 Rotary axis device 25 Processing fluid supply means 26 Flow of clean processing fluid exiting from discharge port or discharge tube

Claims (5)

A rotating shaft body,
A table rotating body that is supported by the rotating shaft body and rotates;
A drive unit for rotating the table rotating body,
A sealing mechanism in which a sealing material is disposed between the rotating shaft main body and the table rotating body,
A first supply unit that supplies a clean fluid used for processing to the seal mechanism unit,
An outlet for discharging a clean fluid used for the processing from the seal mechanism, and an outlet for reducing a flow of the clean fluid used for the processing to the table rotating body,
A rotating shaft device for an electric discharge machine, comprising:   The rotary shaft device of an electric discharge machine according to claim 1, wherein the seal mechanism has a structure that can be divided from the rotary shaft main body.   The rotary shaft device of an electric discharge machine according to claim 1 or 2, wherein an outlet for a clean fluid used for the machining is provided in the seal mechanism.   The rotary shaft device of an electric discharge machine according to any one of claims 1 to 3, wherein a conduit for flowing a clean fluid used for the machining is provided in a sealing member of the sealing mechanism. The rotary shaft device of the electric discharge machine according to any one of 請 Motomeko 1-4 provided in the processing tank, used in processing to be supplied to the first supply portion provided in the rotary shaft device clean EDM equipped with supply amount control means for controlling the amount of fluid.

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