KR100779795B1 - Thermal deformation preventing device of a spindle head - Google Patents

Abstract

An apparatus for preventing a thermal deformation for a spindle of a machine tool is provided to reduce heat transmitted to a head body and a spindle of a machine tool by discharging heat generated from a pulley and a belt in an air-cooling scheme. An apparatus for preventing a thermal deformation for a spindle in a machine tool comprises an insulating box(70), a pipe(65) connected to a side of the insulating box and an exhaust member. The insulating box receives a driving pulley(54) of a driving motor(50) installed in a head body(60), a driven pulley(58) of a spindle operated by the driving motor and a belt(56). The exhaust member is provided at the pipe to exhaust the heat of insulating box. The pipe is connected with the side of the insulating box through a plurality of through holes.

Description

Thermal deformation preventing device of a spindle head

1 is a partial cross-sectional view of a conventional machine tool spindle,

2 is a partial cross-sectional view of a machine tool installed with a heat deformation preventing device according to the present invention;

3 is a partial cross-sectional view for showing the details of each part in FIG.

4 is an enlarged cross-sectional view of portion A- in FIG. 3;

5 is an enlarged cross-sectional view of the portion B- in FIG. 3;

FIG. 6 is an enlarged cross-sectional view of part C in FIG. 3;

FIG. 7 is an enlarged cross-sectional view of part D- in FIG. 3.

<Description of the symbols for the main parts of the drawings>

5: through hole,

10: drive motor,

12: drive shaft,

14: driving pulley,

16: belt,

18: driven pulley,

20: spindle,

22: headbody,

50: drive motor,

52: drive shaft,

56 belt,

58: driven pulley,

60: headbody,

65: communication,

70: insulation box,

72: ventilator,

80: insulation ring member,

90: oil cooling jacket,

92: oil euro,

94: jacket body,

100: exhaust fan.

The present invention relates to a spindle device of a machine tool, and more particularly, to a heat deformation preventing device of a machine tool spindle.

In general, a power transmission method using a drive motor and a belt is used to rotate a spindle of a machine tool. 1 is a partial cross-sectional view of such a conventional machine tool spindle. As shown in FIG. 1, the spindle 20 is rotatably installed on the head body 22, and a driven pulley 18 is installed on the spindle 20.

In addition, a driving motor 10 is installed at one side of the head body 22, and a driving pulley 14 is installed at the driving shaft 12 of the driving motor 10. The belt 16 is installed between the drive pulley 14 and the driven pulley 18 to transmit power. That is, as the drive motor 10 rotates, the drive pulley 14 rotates integrally, and the belt 16 transmits the rotational torque to the driven pulley 18. Accordingly, the spindle 20 rotates by obtaining a rotational torque in accordance with the rotation of the driven pulley 18.

However, such a conventional machine tool generates a lot of heat between the belt and the pulley by driving the belt 16. Then, the generated heat causes partial thermal deformation of the machine tool, the head body 22 and the spindle 20. This, in turn, results in a problem that the machining precision of the workpiece is lowered, and the accumulation of partial thermal deformation is a disadvantage in shortening the life of each component.

Therefore, in order to prevent this, the conventional machine tool uses an unsealed measure to smooth air flow by installing a plurality of through holes 5 in the head body 22, but there is a limit. In addition, an attempt was made to improve the material or shape of the belt in order to suppress heat generation itself, but it was not complete, causing another problem of excessive noise even with a slight error in assembly tolerance. In addition, there are some cases in which a direct drive type of built-in drive motor is applied, but it is not widely commercialized in view of its high price.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention, by minimizing the heat transferred to the head body and the spindle of the machine tool by air-cooled discharge of the heat generated from the pulley and the belt portion It is to provide a thermal deformation preventing device of the machine tool spindle.

An object of the present invention as described above, in a machine tool having a drive motor 50 and a spindle driven by a belt installed in the head body 60,

An insulating box 70 surrounding the drive pulley 54 of the drive motor 50, the driven pulley 58 of the spindle 20, and the belt 56;

Communication 65 connected to one side of the heat insulation box 70; And

It can be achieved by the heat deformation preventing device of the machine tool spindle, characterized in that it is provided in the communication 65 and comprises a discharge means for discharging the heat inside the heat insulation box 70 to the outside.

And, one side and the communication 65 of the heat insulation box 70 is preferably connected to a plurality of vent holes (72).

In addition, it is preferable that the insulating ring member 80 is further provided between the insulating box 70 and the head body 60.

In addition, it may be suitable that a cooling means is further provided between the driving motor 50 and the head body 60. The cooling means is most preferably a jacket body 94 in which an oil cooling jacket 90 through which oil is circulated is formed.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and the preferred embodiments described in conjunction with the accompanying drawings.

The invention will now be described in detail with reference to the accompanying drawings, in which preferred embodiments are shown.

2 is a partial cross-sectional view of a machine tool installed with a heat deformation preventing apparatus according to the present invention. As shown in FIG. 2, the spindle 20 is rotatably installed on the head body 60, and a driven pulley 58 is installed on the spindle 20.

In addition, a driving motor 50 is installed upside down on one side of the head body 60, and a driving pulley 54 is installed on the driving shaft 52 of the driving motor 50. The belt 56 is installed between the driving pulley 54 and the driven pulley 58 to transmit power. That is, as the drive motor 50 rotates, the drive pulley 54 rotates integrally, and the belt 56 transmits the rotational torque to the driven pulley 58. Accordingly, the spindle 20 rotates by obtaining a rotational torque in accordance with the rotation of the driven pulley 58.

The insulation box 70 is made of a metal with low thermal conductivity and is in the form of a hollow hexagonal box. The drive pulley 54, the belt 56 and the driven pulley 58 are positioned in the heat insulation box 70, and the drive shaft 52 and the spindle 20 are formed to pass therethrough. This insulation box 70 is fixed to the head body 60 around it in the spindle 20 area.

The head body 60 of the present invention, unlike the conventional head body 22 shown in Figure 1 is not formed with a through hole (5). This is because there is almost no heat transferred to the head body 60 because the heat generating portion is blocked by the insulating box (70).

Hereinafter, a detailed configuration of each part shown in FIG. 2 will be described. 3 is a partial cross-sectional view for showing the details of each part in FIG. 4 is an enlarged cross-sectional view of portion A- in FIG. 3. As shown in Figure 4, one side of the heat insulating box 70 is configured to contact the communication (65). Communication 65 is an empty space inside, the exhaust fan 100 is installed at the top, in order to minimize heat transfer is installed so as not to contact the head body 60.

A plurality of vent holes 72 are formed in a region where the heat insulation box 70 and the communication 65 is in contact. The vent 72 is to allow the high temperature heat generated inside the heat insulation box 70 to pass through the communication (65).

5 is an enlarged cross-sectional view of the portion B- in FIG. 3. As shown in FIG. 5, the heat insulation box 70 is fixed to the head body 60 around the spindle 20, and insulated to prevent heat from the heat insulation box 70 from being transferred to the head body 60. An insulating ring member 80 is interposed between the box 70 and the head body 60. The insulation ring member 80 serves to block heat transfer while supporting the insulation box 70. To this end, the insulating ring member 80 may be made of a metal having low thermal conductivity, synthetic resin, or rubber.

FIG. 6 is an enlarged cross-sectional view of part C- in FIG. 3. As shown in FIG. 6, the drive shaft 52 is configured to pass through the heat insulation box 70. And, between the drive shaft 52 and the heat insulation box 70 is not completely sealed, which is the outside air when the negative pressure generated inside the heat insulation box 70 due to the operation of the exhaust fan 100 heat insulation box 70 ) To enter inside.

FIG. 7 is an enlarged cross-sectional view of part D- in FIG. 3. As shown in FIG. 7, an oil cooling jacket 90 is provided between the driving motor 50 and the head body 60 to perform a cooling operation. Since the drive motor 50 generates a high temperature by itself due to the rotation, and the head body 60 supports the drive motor 50, if there is no cooling means, the head motor 60 supports the drive motor 50. Significantly high heat transfer occurs. The oil cooling jacket 90, which is a cooling means, blocks the heat transfer and cools the driving motor 50.

An annular jacket body 94 is installed around the drive motor 50, and an oil cooling jacket 90 through which oil can be circulated is formed in the jacket body 94. In order to remove the heated oil and supply the cooled oil, an oil flow path 92 is formed in the jacket body 94. In the drawings of the present invention, a separate oil supply pump and a cooling device for the oil cooling jacket 90 will be omitted.

Hereinafter, the operation of the heat deformation preventing apparatus of the machine tool spindle having the above configuration will be described. Heat generated as the drive motor 50 rotates is not transferred to the head body 60 by the cooling action of the oil circulating in the oil cooling jacket 90.

Then, the heat generated from the drive pulley 54, belt 56 and driven pulley 58 is first located in the heat insulating box (70). At this time, as the exhaust fan 100 operates, the inside of the communication 65 is made into a negative pressure, which in turn causes hot air in the insulation box 70 to be discharged into the communication 65 through the vent hole 72. Therefore, the cool air in the atmosphere enters the gap between the drive shaft 52 and the heat insulation box 70 to cool the inside, and then ascends through the communication 65 through the air vent 72, and then the exhaust fan 100. ) Is discharged to the outside again.

Although the heat insulation box 70 has its own temperature increased due to the high temperature heat therein, the heat of the heat insulation box 70 is transferred to the head body 60 due to the heat insulation ring member 80 in contact with the heat insulation box 70. It doesn't work.

Although the present invention shows and described the heat insulating ring member as a heat insulating means, it is a matter of course that various other heat insulating materials can be applied.

In addition, in the present invention, the oil jacket is illustrated and described as a cooling means, but various other cooling methods (water cooling, air cooling, etc.) may be applied.

Further, the heat insulating means and the cooling means may be used in combination or alternately.

Therefore, according to one embodiment of the present invention as described above, by heat dissipating air generated in the pulley and the belt portion can be minimized the heat transferred to the head body and the spindle of the machine tool.

As a result, it is possible to prevent thermal deformation, to improve the machining precision of the machine tool, and to prolong the life.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention. It is obvious that modifications are all within the scope of the appended claims.

Claims (5)

In a machine tool having a drive motor 50 installed in the head body 60 and a spindle driven by a belt, A heat insulation box 70 surrounding the drive pulley 54 of the drive motor 50, the driven pulley 58 of the spindle 20, and the belt 56; Communication 65 connected to one side of the heat insulation box 70; And The thermal deformation prevention apparatus of the machine tool spindle, characterized in that it comprises a discharge means which is provided in the communication (65) for discharging the heat inside the heat insulation box (70) to the outside. The method of claim 1, One side of the heat insulation box 70 and the communication (65) is a heat deformation preventing device of the machine tool spindle, characterized in that connected by a plurality of vent holes (72). The method of claim 1, The thermal deformation preventing device of the machine tool spindle, characterized in that the insulating ring member 80 is further provided between the insulating box 70 and the head body (60). The method of claim 1, Cooling means is further provided between the drive motor (50) and the head body (60). The method of claim 4, wherein the cooling means, Heat deformation preventing device of the machine tool spindle, characterized in that the jacket body (94) formed with an oil cooling jacket (90) in which the oil is circulated.

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