KR20220064725A - Rotary table for mill turn of machine tool - Google Patents

Abstract

The present invention relates to a rotary table for a mill turn of a machine tool that selectively or simultaneously performs milling and turning. According to the present invention, the rotary table for a mill turn of a machine tool comprises: a housing; a shaft rotatably disposed inside the housing; a table coupled with the shaft to rotate a workpiece; a bearing unit installed between the shaft and the housing; and a lubricating line formed in the bearing unit so that the lubricating oil flows in the bearing unit.

Description

Rotary table for mill turn of machine tool

The present invention relates to a rotary table for a mill turn of a machine tool, and more particularly, when the machining mode of the machine tool is changed, the lubricant oil excessively lubricated in the bearing unit is drained to the outside of the bearing unit through the lubrication line. It relates to a rotary table for mill turn of a machine tool for solving the heat problem of a bearing unit during high-speed rotation by supplying appropriate lubricating oil.

In general, a machine tool refers to a machine used for the purpose of processing a metal/non-metal workpiece into a desired shape and size using an appropriate tool by various cutting or non-cutting methods.

Various types of machine tools, including turning centers, vertical/horizontal machining centers, door machining centers, Swiss turns, electric discharge machines, horizontal NC boring machines, CNC lathes, multi-tasking machines, etc. is being used

Among machine tools, multi-tasking machine means a machine tool equipped with a multi-function automatic tool changer (ATC) and tool magazine that performs various machining types such as turning, drilling, tapping, and milling. In the multi-tasking machine, the operator loads the tool required for machining or manually loads the tool into the tool magazine when exchanging it.

In general, various types of machine tools currently used have an operation panel to which numerical control (NC) or computerized numerical control (CNC) technology is applied. Such an operation panel is provided with various function switches or buttons and a monitor.

In addition, the machine tool is a table on which a workpiece material is seated and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle that rotates when a tool or workpiece is combined, a tailstock for supporting the workpiece, etc. during processing, a vibration isolator etc. are provided.

In general, in a machine tool, a table, a tool rest, a main shaft, a tailstock, a vibration isolator, etc. are provided with a conveying unit conveying along a conveying axis in order to perform various machining.

In addition, in general, a machine tool uses a plurality of tools for various processing, and a tool magazine or a turret is used as a tool storage place for storing and storing a plurality of tools.

In addition, in general, a machine tool is provided with an automatic tool changer (ATC, Automatic Tool Changer) for withdrawing a specific tool from the tool magazine or receiving it again according to the command of the numerical control unit in order to improve the productivity of the machine tool.

In addition, in general, a machine tool is provided with an automatic pallet changer (APC, Automatic Palette Changer) in order to minimize the non-working time. The automatic pallet changer (APC) automatically exchanges pallets between the workpiece machining area and the workpiece installation area. Pallets may be loaded with workpieces.

In addition, in general, machine tools are largely classified into turning centers and machining centers according to processing methods. A turning center is a machine tool that performs turning by approaching a tool while rotating a material, and a machining center refers to a machine tool that can perform drilling, tapping, and milling processing on a stationary material. do.

With the recent development of industries such as aerospace/space and automobiles, the demand for manufacturing parts with complex shapes is on the rise.

In particular, in the case of the aerospace industry, in order to efficiently manufacture parts with complex shapes such as blisks, a 5-axis machining machine that can perform 5-axis milling and turning processes simultaneously in one machine is required. do.

In general, a 5-axis machining machine consists of 3 linear axes and 2 rotating axes, and the 2 rotating axes are composed of 1 spindle tilting axis and 1 table axis, or 2 spindle axes or 2 table axes.

The multi-tasking machine manufactured to enable milling and turning at the same time in one machine tool can be divided into two types. One is the "Turm-Mill", which is a form of adding a milling spindle (1 axis of rotation) to the tool rest of the turning center, which is a turning equipment consisting of 1 rotational axis and 3 linear axes, and the other is a 3 linear axis and 3 rotational axes. There is a "Mill-Turn", a type of machining center, which is a milling equipment composed of two axes (composed of a tilting axis and a rotating axis), in which one axis of rotation of the workpiece can be rotated at high speed like a turning spindle.

In such a mill-turn 5-axis machining machine, lubricants such as oil and air are used to implement a turning mode that performs turning based on a machining center, a milling equipment, and in this case, foreign substances are prevented from entering. A sealing part is provided to do this.

Mill-Turn-type machining center is a machine tool that implements a turning mode that performs turning based on a machining center, a milling equipment, and most of the machining time of a workpiece is made by milling.

Accordingly, the rotary table for mill turn of the conventional machine tool repeats the rotation in a narrow range at a low rotation speed of the table due to the characteristics of the milling process.

If lubricating oil such as oil or air introduced into the bearing unit is not drained by the sealing part and is continuously accumulated, the inside of the bearing unit is in an over-lubricated state.

In this way, if the machining mode of the machine tool is switched and turning is performed while the inside of the bearing unit is over-lubricated, the rotary table for mill turn of the machine tool rotates at high speed for turning. The temperature rises rapidly due to viscous resistance and friction, causing a problem that causes seizures due to deterioration.

Korean Patent Publication No. 10-2010-0054498

The present invention is to solve the above problems, and an object of the present invention is to drain the lubricating oil excessively lubricated in the bearing unit to the outside of the bearing unit to maintain the proper lubricating oil inside the bearing unit. It is to provide a rotary table for mill turn of a machine tool to prevent excessive heat generation in the bearing unit even when high-speed rotation is performed by changing the

In order to achieve the object of the present invention, the rotary table for mill turn of a machine tool according to the present invention is a rotary table for mill turn of a machine tool for selectively or simultaneously performing milling and turning, comprising: a housing; a shaft rotatably disposed inside the housing; a table coupled to the shaft to rotate the workpiece; a bearing unit installed between the shaft and the housing; and a lubrication line formed in the bearing unit so that lubricating oil flows to the bearing unit, wherein the lubricating oil overlubricated in the bearing unit when the machining mode of the machine tool is switched is transferred to the outside of the bearing unit through the lubrication line can be drained with

In addition, in another preferred embodiment of the rotary table for mill turn of the machine tool according to the present invention, the bearing unit, the inner ring rotates in association with the rotation of the shaft; an outer ring installed in the housing; a driving body disposed between the inner ring and the outer ring; and a sealing unit having one side coupled to the inner ring and the other side coupled to the outer ring to seal the driving body.

In addition, in another preferred embodiment of the rotary table for mill turn of the machine tool according to the present invention, the lubrication line, a supply line formed on the outer ring for supplying lubricating oil; a transmission line formed through the inner ring to communicate with the supply line so that the lubricating oil supplied through the supply line flows through the driving body; and a drain part formed in the sealing part to control the amount of lubricating oil flowing through the driving body through the transmission line.

In addition, in another preferred embodiment of the rotary table for mill turn of the machine tool according to the present invention, the drain part is formed through the sealing part so that the center of the drain part is located on the extension line of the contact surface of the inner ring and the driving body. can

In addition, in another preferred embodiment of the rotary table for mill turn of the machine tool according to the present invention, the drain portion can be formed in a circular cross section through the sealing portion so that the diameter is 1.8mm or more to 2.2mm or less.

In addition, in another preferred embodiment of the rotary table for mill turn of the machine tool according to the present invention, the drain part penetrates the sealing part so that the amount of lubricating oil flowing through the driving body is maintained at 12 L/min or more and 18 L/min or less. can be formed.

In addition, in another preferred embodiment of the rotary table for mill turn of the machine tool according to the present invention, the drain part may be formed through the sealing part so that the internal positive pressure of the bearing unit is maintained at 0.6 bar or more and 1.0 bar or less.

In addition, in another preferred embodiment of the rotary table for mill turn of the machine tool according to the present invention, the drain part is formed through a plurality of the sealing part, and may be arranged at equal intervals based on the center of the bearing unit.

The rotary table for mill turn of the machine tool according to the present invention operates in the milling mode for a long period of time and then switches the machining mode to perform high-speed rotation for turning. As it is discharged through the lubrication line without being accumulated and only the proper amount of lubricating oil flows inside the bearing unit, which is the amount necessary to form an oil film, the excessive lubricating oil causes the bearing unit to rapidly increase in temperature due to viscous resistance and friction. It has the effect of preventing the occurrence of problems that cause seizures.

In addition, in the rotary table for mill turn of the machine tool according to the present invention, the effect of the sealing part for blocking the inflow of foreign substances into the bearing unit is not deteriorated, and at the same time, the lubricant flowing inside the bearing unit flows inside the bearing unit. The drain part of the lubrication line is formed in the optimal position and/or in the optimal diameter so that only the proper amount of lubricating oil, which is the amount necessary to form an oil film, flows inside the bearing unit without being accumulated, it is discharged through the lubrication line. It has the effect of improving processing precision by preventing malfunction.

In addition, the rotary table for mill turn of the machine tool according to the present invention maintains an appropriate lubrication state in which only an appropriate lubricating oil for lubrication of the bearing unit flows, so additional even operation is not required, so the non-working time is maximized to maximize the machine tool It has the effect of improving productivity and maximizing operator convenience.

Furthermore, the rotary table for mill turn of the machine tool according to the present invention prevents the bearing unit from causing seizures due to deterioration due to rapid increase in temperature due to viscous resistance and friction due to excessive lubricating oil, thereby preventing damage to the bearing unit. This has the effect of minimizing the maintenance cost of the machine tool and maximizing the stability and reliability of the machine tool.

1 shows a perspective view of a rotary table for a mill turn of a machine tool.
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 .
3 is an enlarged view of part B of FIG. 2 .
FIG. 4 is an enlarged view of part B of FIG. 2 .
5 is a perspective view of a bearing unit of a rotary table for a mill turn of a machine tool.
6 shows a front view of the bearing unit of the rotary table for mill turns of the machine tool.

Hereinafter, with reference to the drawings of the rotary table for a mill turn of a machine tool according to an embodiment of the present invention will be described in detail. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers refer to like elements throughout.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

The terminology used herein is for the purpose of describing the embodiments, and thus is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations, and/or elements mentioned. or addition is not excluded.

1 is a perspective view of a rotary table for a mill turn of a machine tool, and FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 .

FIG. 3 shows an enlarged view of part B of FIG. 2 , and FIG. 4 shows an enlarged view of part B of FIG. 2 .

Figure 5 shows a perspective view of the bearing unit of the rotary table for mill turn of the machine tool, Figure 6 shows a front view of the bearing unit of the rotary table for mill turn of the machine tool.

A rotary table 1 for a mill turn of a machine tool according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6 . 1 to 6, the rotary table 1 for a mill turn of a machine tool according to an embodiment of the present invention includes a housing 100, a shaft 200, a table 300, a bearing unit 400 and It includes a lubrication line (500).

The rotary table 1 for mill turn of a machine tool according to an embodiment of the present invention is a rotary table 1 for mill turn applied to a machine tool that selectively or simultaneously performs milling and turning.

In other words, machine tools are largely classified into turning centers and machining centers according to the processing method. Turning centers mainly rotate the workpiece and move the tool to perform turning, while the machining center mainly rotates the tool and The work is moved and milling is performed. Referring to FIG. 1 , the rotary table 1 for mill turn of a machine tool according to an embodiment of the present invention has three linear axes and two rotational axes (tilting axis). and a rotating shaft), which is a form of high-speed rotation of one axis of the workpiece in a machining center consisting of a turning spindle, will be.

In addition, in the lubrication line 500 of the rotary table 1 for mill turn of the machine tool according to an embodiment of the present invention, when the machining mode of the machine tool is switched, the overlubricated lubricant O in the bearing unit 400 is It may be drained to the outside of the bearing unit 400 through the lubrication line 500 .

That is, even when the rotary table for mill turn of the machine tool according to the present invention is driven in the milling mode for a long period of time and rotates at high speed for turning by switching the machining mode, the lubricant oil flowing through the bearing unit is It is discharged through the lubrication line without being accumulated inside the bearing unit so that only the proper amount of lubricating oil flows inside the bearing unit, which is the amount necessary to form an oil film. It is possible to prevent the occurrence of problems that cause seizures.

The housing 100 of the rotary table 1 for mill turn of a machine tool according to an embodiment of the present invention forms a lower portion of the rotary table 1 for mill turn, and a space in which parts can be accommodated can be formed. there is. Also, although not necessarily limited thereto. Arranged or installed so that it can be fixed to the installation surface.

The shaft 200 of the rotary table 1 for a mill turn of a machine tool according to an embodiment of the present invention may be disposed inside the housing 100 and is rotatably installed to be rotationally driven by a driving motor or the like.

The table 300 of the rotary table 1 for mill turn of the machine tool according to an embodiment of the present invention serves to support and rotate the work placed thereon, and is coupled with the shaft 200 to rotate the shaft 200 . It rotates in conjunction with the , and as a result, the workpiece placed on the top is rotated.

The bearing unit 400 of the rotary table 1 for mill turn of the machine tool according to an embodiment of the present invention is installed between the rotating shaft 200 and the fixed housing 100 so that the shaft 200 is smoothly installed. It serves to enable rotation.

3 to 6 , the bearing unit 400 includes an inner ring 410 , an outer ring 420 , a driving body 430 , and a sealing part 440 .

The inner ring 410 of the bearing unit 400 is coupled to the shaft 200 to rotate in association with the rotation of the shaft 200 , and the outer ring 420 of the bearing unit 400 is installed in the housing 100 , , Specifically, the inner ring 410 is fixedly installed while facing each other and spaced apart. In addition, although not necessarily limited thereto, a portion of the outer ring 420 may be accommodated in the inner ring 410 as shown in the drawings.

The driving body 430 of the bearing unit 400 is disposed between the inner ring 410 and the outer ring 420 to rotate the shaft while supporting the weight of the rotating shaft of the rotating inner wheel 410 and the load applied to the rotating shaft.

One side of the sealing part 440 of the bearing unit 400 is coupled to the inner ring 410 and the other side is coupled to the outer ring 420 to seal the driving body 430 .

That is, the sealing part 440 is applied to prevent foreign substances, such as chips or coolant, generated during processing from the outside from flowing into the bearing unit 400 .

In addition, when a part of the outer ring 420 is accommodated in the inner ring 410 as shown in the drawing, one side of the sealing part 440 is coupled to the inner ring 410 and the other side is coupled to the outer ring 420 when the sealing part ( A space is formed inside the bearing unit 400 by 440 .

3 and 4 , although not necessarily limited thereto. As will be described later, the space formed inside the bearing unit 400 may include a first chamber part 540 , a second chamber part 550 , and a third chamber part 560 .

The lubrication line 500 of the rotary table 1 for a mill turn of the machine tool according to an embodiment of the present invention is formed in the bearing unit 400, and the lubricating oil O flows through the lubrication line 500 to the bearing unit The lubricating oil (O) may be supplied to the 400 . That is, the lubricant O is supplied to the first chamber part 540 , the second chamber part 550 , and the third chamber part 560 formed inside the bearing unit 400 .

3 to 6 , the lubrication line 500 includes a supply line 510 , a delivery line 520 , and a drain unit 530 .

The supply line 510 is formed on the outer ring 420 and is a part to which the lubricating oil O is supplied, and the delivery line 520 is the lubricating oil O supplied through the supply line 510 to the bearing unit 400 . The driving body 430 is formed through the inside of the outer ring 420 to communicate with the supply line 510 to flow.

3 and 4 , the delivery line 520 may be formed to be inclined upwardly so that the lubricant O is directly supplied between the first chamber part 540 and the second chamber part 550 selectively as needed. Alternatively, the lubricating oil O may be directly supplied between the second chamber part 550 and the third chamber part 560 to be inclined downward.

The drain part 530 may be formed in the sealing part 440 to control the amount of lubricant O flowing through the driving body 430 through the transmission line 520 .

That is, the drain unit 530 may include a lubricant O in the first chamber unit 540 , the second chamber unit 550 , and/or the third chamber unit 560 formed inside the bearing unit 400 . There is only an appropriate amount of lubricating oil, which is an amount necessary to form an oil film, and excess lubricant (O) exceeding the appropriate amount of lubricating oil is discharged to the outside of the bearing unit 400 , so that the driving body 430 among the bearing units 400 in particular operates at high speed. It can prevent excessive heat generation due to over lubrication when rotating with

Referring to FIG. 3 , the drain part 530 may be formed through the sealing part 440 , and in this case, the center of the drain part 530 is an extension of the contact surface between the inner ring 410 and the driving body 430 . It may be located on the line (C).

As such, when the position of the center of the drain part 530 is on the extension line C of the contact surface between the inner ring 410 and the driving body 430, the driving body 430 is linked to the rotation of the inner wheel 410, which is a rotating body. ) rotates together, the lubricant O flows and the amount of lubricant O accumulated inside the bearing unit 400 can be minimized. And, the excess lubricating oil (O) exceeding the appropriate amount of lubricating oil can be efficiently discharged to the outside of the bearing unit 400 .

In addition, referring to FIG. 3 , the drain part 530 is formed through the sealing part 440 , and the cross-section of the drain part 530 formed in the tube may be formed in a circular shape, in this case the diameter of the circular cross-section. The silver may be formed to be 1.8 mm or more and 2.2 mm or less.

If the diameter (D) of the circular cross-section of the drain part 530 penetrating through the sealing part 440 is smaller than 1.8 mm, the amount of lubricating oil O accumulated in the bearing unit 400 will increase the amount of oil film. Existing in excess of the appropriate amount of lubricating oil, which is an amount required for formation, and excess lubricant (O) exceeding the appropriate amount of lubricant is not efficiently discharged to the outside of the bearing unit 400, so that the inside of the bearing unit is over-lubricated. When turning is performed by changing the machining mode of the machine tool, the rotary table for mill turn of the machine tool rotates at high speed for turning. There is a problem that causes seizures.

In addition, if the diameter (D) of the circular cross-section of the drain part 530 penetrating through the sealing part 440 exceeds 2.2 mm, the internal pressure of the bearing unit 400 is not maintained and the bearing unit ( There is a problem that foreign substances are introduced from the outside of the bearing unit 400 to the inside of the bearing unit 400. That is, the rotary table 1 for a mill-turn of a machine tool according to an embodiment of the present invention is a milling equipment. Lubricating oil (0) such as oil air is applied to the inside of the bearing unit 400 to implement a turning mode that performs turning based on the in-machining center, and at the same time, foreign substances from the outside flow into the inside of the bearing unit 400 A sealing part is provided in order to prevent the leakage, and the inflow of external foreign substances through the drain part 530 is prevented by maintaining the inside of the bearing unit 400 to be higher than atmospheric pressure.

However, when the diameter (D) of the circular cross-section of the drain part 530 penetrating through the sealing part 440 exceeds 2.2 mm, the internal pressure of the bearing unit 400 is not maintained to be higher than atmospheric pressure, so external foreign substances The machine tool may malfunction by penetrating into the bearing unit 400 to damage the bearing unit 400 and contaminate the lubricating oil O flowing in the bearing unit 400 .

The drain part 530 of the lubrication line 500 of the rotary table 1 for a mill turn of a machine tool according to an embodiment of the present invention has an amount of lubricating oil flowing through the driving body 430 of 12 L/min or more to 18 L/min. It may be formed through the sealing part 440 to maintain min or less.

If the amount of lubricating oil flowing through the driving body 430 is less than 12 L/min, the amount of lubricating oil (O) accumulated inside the bearing unit 400 is present in a small amount than the proper amount of lubricating oil required to form an oil film. Therefore, the operation of the bearing unit 400 may not be performed smoothly, so that a malfunction of the machine tool may occur and the quality of the processed workpiece may be deteriorated.

In addition, if the amount of lubricating oil flowing through the driving body 430 exceeds 18 L/min, the amount of lubricating oil O accumulated in the bearing unit 400 is the amount required to form an oil film. Excessive lubricating oil (O), which is present in excess and exceeds the appropriate amount of lubricating oil, is not efficiently discharged to the outside of the bearing unit 400, so turning is performed by switching the machining mode of the machine tool while the inside of the bearing unit is over-lubricated In this case, since the rotary table for mill turn of the machine tool rotates at high speed for turning, the temperature of the bearing unit due to excessive lubricating oil rapidly rises due to viscous resistance and friction, and the bearing unit 400, especially the driving body 430 ) is damaged.

The drain part 530 of the lubrication line 500 of the rotary table 1 for a mill turn of the machine tool according to an embodiment of the present invention maintains the internal positive pressure of the bearing unit 400 to be 0.6 bar or more to 1.0 bar or less. It may be formed through the sealing part 440 .

Positive pressure refers to a pressure slightly higher than atmospheric pressure that prevents the infiltration of polluted air from the outside and allows air for decontamination to flow naturally to the outside.

Specifically, a pressure of 2 bar is always supplied to the inside of the bearing unit 400 for the supply of lubricating oil, and a positive pressure of 0.6 bar or more to 1.0 bar to prevent foreign substances from penetrating into the inside of the bearing unit 400 should be maintained as Therefore, even if the drain part 530 is formed through the sealing part 440 , the drain part 530 must be formed so that the above-described positive pressure can be maintained.

If the internal positive pressure of the bearing unit 400 is less than 0.6 bar, foreign substances penetrate into the inside of the bearing unit 400, so that the operation of the bearing unit 400 is not performed smoothly, so that the machining of the machine tool is not performed. Failure to do so may cause problems that impair the reliability and stability of the machine tool.

In addition, if the internal positive pressure of the bearing unit 400 exceeds 1.0 bar, it is possible to prevent foreign substances from penetrating into the interior of the bearing unit 400, but as the pressure increases, the power required increases. There may be a problem in that the maintenance cost of the machine tool is increased.

5 and 6, the drain part 530 of the lubrication line 500 of the rotary table 1 for a mill turn of a machine tool according to an embodiment of the present invention is formed through the sealing part 440 in plurality. A plurality of drain portions 530 penetratingly formed may be arranged at equal intervals based on the center (E) of the bearing unit 400 .

When a plurality of drain parts 530 are formed in this way, the number of drain parts 530 can be variously adjusted according to the size of the bearing unit, the amount of lubricating oil discharged can be variously adjusted, and the drain part 530 can be variously adjusted. When the bearings are arranged at equal intervals with respect to the center (E) of the bearing unit 400 , the amount of lubricant O may be appropriately maintained in the entire region rather than being focused on a specific region of the bearing unit 400 .

In the detailed description of the present invention described above, although it has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the technical field of the present invention described in the claims to be described later It will be understood that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: rotary table for mill turn (1), 100: housing,
200: shaft, 300: table,
400: bearing unit, 410: inner ring,
420: outer ring, 430: driving body,
440: sealing part, 500: lubrication line,
510: supply line, 520: delivery line,
530: drain part

Claims (8)

In the rotary table for mill turn of a machine tool that selectively or simultaneously performs milling and turning,
housing;
a shaft rotatably disposed inside the housing;
a table coupled to the shaft to rotate the workpiece;
a bearing unit installed between the shaft and the housing; and
Including; a lubrication line formed in the bearing unit so that the lubricating oil flows in the bearing unit;
A rotary table for a mill turn of a machine tool, characterized in that when the machining mode of the machine tool is changed, the lubricant oil excessively lubricated in the bearing unit is drained to the outside of the bearing unit through the lubrication line.
According to claim 1,
The bearing unit is
an inner ring rotating in association with the rotation of the shaft;
an outer ring installed in the housing;
a driving body disposed between the inner ring and the outer ring; and
A rotary table for mill turn of a machine tool comprising a; one side is coupled to the inner ring and the other side is coupled to the outer ring to seal the driving body.
3. The method of claim 2,
The lubrication line is
a supply line formed on the outer ring to supply lubricating oil;
a transmission line formed through the inner ring to communicate with the supply line so that the lubricating oil supplied through the supply line flows through the driving body; and
and a drain part formed in the sealing part to control the amount of lubricating oil flowing through the driving body through the transmission line.
4. The method of claim 3,
The drain part,
The rotary table for mill turn of a machine tool, characterized in that formed through the sealing portion so that the center of the drain portion is located on the extension line of the contact surface of the inner ring and the driving body. 4. The method of claim 3,
The rotary table for mill turn of a machine tool, characterized in that the drain portion is formed in a circular cross-section through the sealing portion so that the diameter is 1.8mm to 2.2mm or more.
4. The method of claim 3,
The drain part is a rotary table for a mill turn of a machine tool, characterized in that formed through the sealing part to maintain the amount of lubricating oil flowing through the driving body 12 L / min or more to 18 L / min or less.
4. The method of claim 3,
The drain part is a rotary table for a mill turn of a machine tool, characterized in that formed through the sealing part to maintain the internal positive pressure of the bearing unit is 0.6 bar or more to 1.0 bar or less.
4. The method of claim 3,
A rotary table for a mill turn of a machine tool, characterized in that the drain part is formed through the sealing part in plurality, and is arranged at equal intervals based on the center of the bearing unit.

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