KR101017840B1 - cooling system of ball screw - Google Patents

Abstract

The present invention relates to a cooling device for a ball screw used in a machine tool, the heat pipe having one end inserted in the ball screw in the longitudinal direction; And a heat dissipation member exposed at the other end of the heat pipe to the outside of the ball screw and coupled to the other end of the heat pipe.

Providing the invention as described above, the device configuration is much easier and the production cost is lower than the device by the conventional cooling flow circulation, it is possible to increase the high efficiency and durability. In addition, there is an advantage that it is possible to prevent the performance degradation due to various oxidation and bearing penetration of the plant machinery by the cooling flow is not used.

Heat Pipes, Machine Tools, Ball Screws, Ball Nuts

Description

Cooling system of ball screw

The present invention relates to, for example, a cooling device for a ball screw (BALL SCREW) used for transporting a structure of a machining center. More specifically, the degree of processing is minimized by minimizing heat displacement generated during transport of a structure. The present invention relates to a ball screw chiller that can increase and improve the life of the ball screw.

Conventional ball screw chiller is attached to the rotating union (ROTATING UNION) 10 in the form of THROUHG FLOW at the end of the ball screw as shown in Figure 1 through the inside of the ball screw 12 having a hollow The refrigerant is introduced into the furnace and the refrigerant is recovered through the hole 12a on the side of the ball screw on the opposite side.

At this time, the ROTATING SEAL 14 is used to prevent leakage of the refrigerant. In this structure, initial refrigerant leakage occurs depending on the quality of the rotating seal. In addition, even if there is no initial refrigerant leakage, wear of the rotating chamber 14 occurs due to continuous rotational friction during operation of the servomotor (M), which causes the amount of refrigerant leakage to increase as time passes. As a result, the refrigerant refill period becomes shorter.

In addition, in this structure, if a problem occurs in the cooling device of the ball screw, in order to correct it, the motor bracket must be completely disassembled, the relevant parts must be corrected, the parts related to the overall ball screw assembly must be readjusted, and then assembled. In addition, the hole 12a on the side of the ball screw 12 must be additionally processed, and there is no method for preventing wear of the rotating seal 14 separately. In addition, if the structure is complicated and modification is required, it takes time and effort. In addition, the expensive rotating seal 14 and related parts are required, which requires a lot of manufacturing cost.

The problem to be solved by the present invention is that the device configuration is much easier than the device by the conventional cooling flow circulation, and the production cost is lowered, as well as high efficiency and durability. In addition, since the cooling flow is not used, it is possible to prevent performance degradation due to various oxidation and bearing penetration of the machine tool by the cooling flow.

A first feature of the present invention for solving the above problems is a cooling device of a ball screw for transporting a structure, the heat pipe one end is inserted into the ball screw in the longitudinal direction; And a heat dissipation member exposed at the other end of the heat pipe to the outside of the ball screw and coupled to the other end of the heat pipe.

Here, the heat pipe is preferably a plurality of heat pipes are inserted into the plurality of hollow through the ball screw, it is preferable that the refrigerant inserted into the heat pipe has a boiling point of 10 ℃ to 60 ℃.

Preferably, the heat pipe may be inserted into a hollow penetrating the ball screw so as to rise in the distal direction from the center of the ball screw, the heat dissipation member coupled to the heat pipe end is a heat sink and a direction perpendicular to the heat sink It may be composed of a plurality of heat dissipation fins or heat dissipation wings that are erected.

According to a second aspect of the present invention, there is provided a cooling apparatus for a ball screw for transporting a structure, comprising: a heat pipe having one end inserted in a length direction in the ball screw; A heat dissipation member having the other end of the heat pipe exposed to the outside of the ball screw and coupled to the other end of the heat pipe; And a fan connected to the ball screw end so as to be spaced apart from the heat radiating member, and a fan facing the heat radiating member mounted on one surface of the housing to dissipate heat generated from the heat radiating member to the outside.

Here, the heat pipe is preferably a plurality of heat pipes are inserted into the plurality of hollow through the ball screw, the refrigerant inserted into the heat pipe is preferably a boiling point 10 ℃ to 60 ℃, the heat The pipe is preferably inserted into the hollow through the ball screw so as to rise in the distal direction from the ball screw center.

In addition, the heat dissipation member coupled to the heat pipe end is preferably composed of a heat dissipation plate and a plurality of heat dissipation fins or heat dissipation wings that are erected in a direction perpendicular to the heat dissipation plate.

Providing the present invention as described above, the device configuration is much easier than the apparatus by the conventional cooling flow circulation, the production cost is lowered, as well as high efficiency and durability can be increased. In addition, there is an advantage that it is possible to prevent the performance degradation due to various oxidation and bearing penetration of the plant machinery by the cooling flow is not used.

In addition, since the heat sink exposed to the outside air is wide and the heat sink fin has a cross-sectional area of high heat dissipation efficiency, the performance of the entire heat pipe can be improved. In addition, since the heat pipe is embedded in the ball screw, the heat pipe also rotates when the ball screw is driven to rotate. At this time, the heat dissipation member rotates to make contact with external air at room temperature, thereby improving cooling efficiency. do.

First embodiment

2 is a view illustrating a configuration of a cooling device of a ball screw according to the present invention. As shown in FIG. 2, in the ball screw 10 for conveying a structure, the ball screw 10 is embedded with the heat pipe 30 inserted in the longitudinal direction inside. One end of the heat pipe is inserted and embedded in the longitudinal direction inside the screw, the other end is exposed to the outside, and is configured to include a heat dissipation member 40 connected to the distal end of the heat pipe exposed to the outside.

Here, one end of the heat pipe embedded in the longitudinal direction of the ball screw 10 may be embedded including a heat absorbing portion having a high thermal conductivity, embedding only the heat absorbing portion, and exposing the heat pipe to the outside of the ball screw. That is, (not shown), that is, it can be configured in the most suitable manner in consideration of the device configuration and cooling efficiency of the ball screw 10 feeder.

Referring to FIG. 2, in the structure transfer device of the machining center, the ball screw 10 is rotated by the driving of the motor M, and a spiral groove is formed in the outer diameter of the ball screw 10, and a corresponding groove is formed. Is connected to the ball nut 20 and the ball through the structure of the ball screw 10 is converted to the translational movement of the ball nut.

Since the ball screw 10 and the ball nut 20 are driven in such a manner as to transfer the drive, a considerable frictional heat is generated at the contact portion, and the frictional heat is the heat displacement of the ball screw 10 to the ball nut 20. Will bring. This thermal displacement eventually leads to problems with the durability of the feeder and the productivity of the entire machining center.

Therefore, in the present invention, a cooling device is designed to prevent thermal deformation of the ball screw 10, and a method of compensating the problems of the cooling method through circulation of the conventional cooling oil and improving the cooling efficiency and productivity is devised.

That is, as shown in Figure 2, the present invention adopts a method of embedding the heat pipe 30 in the ball screw 10 to effectively transfer heat to the outside during the high speed rotation of the ball screw 10 to cool.

3 is a diagram illustrating a brief configuration diagram of a heat pipe applied in the present invention. A heat pipe is also called a heat pipe. It was manufactured by General Motors of the United States in 1942 for heat dissipation of spacecraft. It is a vacuum pipe inside, filled with volatile liquid inside of many small holes. When heat is applied at one end of the pipe, the liquid evaporates and moves to the other end with thermal energy. It dissipates at the other end of the pipe and passes through it to return to its original position.

Copper, stainless steel, ceramics, tungsten, and the like are used as the material of the main body, and porous fibers and the like are used for the inner wall. Methanol, acetone, water, mercury, etc. are used as an internal volatile substance. Referring to FIG. 3 in more detail, the heat pipe is a vacuum pipe, and is composed of an evaporator, a heat insulating part, and a condensation part.

A structure having a wick structure is located on the inner wall of the heat pipe, and the refrigerant is partially filled therein. Through this structure, the refrigerant is heated in the evaporator to evaporate inside the heat pipe, and the evaporated gas moves to a condensation unit having a low pressure due to a high pressure.

The condensation part is a portion cooled by rain in the evaporation part, and the refrigerant gas condenses again to liquefy. The refrigerant reduced into liquid is moved to the evaporator by capillary action along the wick structure 31 on the inner wall of the heat pipe. Through such phase change cycle of the refrigerant, the refrigerant vaporizes the heat to be vaporized from the condenser to the outside to cool the cooled object. Therefore, the end of the condensation portion is a heat radiation member 40 for dissipating heat to the outside.

The heat dissipation member 40 is preferably composed of a heat dissipation plate 41 and the heat dissipation fin 43. When the heat dissipation plate 41 and the heat dissipation fin 43 exposed to the outside air have a wide cross-sectional area, the heat dissipation efficiency is high, and thus the performance of the entire heat pipe 30 may be improved. Since the heat pipeton is embedded in the ball screw 10, the heat pipe also rotates when the ball screw 10 is driven to rotate. At this time, the heat dissipation member 40 rotates to make contact with external air at room temperature. While cooling efficiency becomes more effective.

Therefore, the heat dissipation plate 41 is suited to the configuration efficiency and system stability of the entire cooling system, and the heat dissipation fin 43 or the heat dissipation blade allows contact with external air in a large area, and reduces air resistance during rotation. Of course, you can choose the shape and size to help.

In addition, the heat pipe 30 is preferably embedded in the longitudinal direction opposite to the drive motor of the ball screw 10. In consideration of the structural shape and the position of the motor can be inserted into the motor of course. In addition, the heat pipe may form a plurality of through holes in the longitudinal direction inside the ball screw 10, and it is also possible to insert a plurality of heat pipes into the through holes.

The cooling efficiency may depend on the heat pipe itself performance, but may also be improved by the number embedded in the ball screw 10. Therefore, by embedding the plurality of heat pipes in consideration of the design process, of course, the cooling efficiency can be increased.

4 is an enlarged cross-sectional view illustrating the structure of a cooling device of the ball screw 10 according to the present invention. As shown in FIG. 4, the evaporation part of the heat pipe is inserted and embedded in the ball screw 10, and the condensation part end is exposed to the ball screw 10 outside. The heat dissipation member 40 is mounted at the end of the heat pipe, and when the refrigerant inside the heat pipe vaporizes and moves to the condenser, the temperature of the condenser is cooled to liquefy the refrigerant to be transferred to the evaporator. The heat dissipation member 40 is discharged.

Heat dissipation member 40 is preferably installed on the side of the workbench to expand the exposure to the outside air, and to be installed to cool more efficiently. The heat dissipation member 40 is preferably composed of a heat dissipation plate 41 and the heat dissipation fin 43. When the heat dissipation plate 41 and the heat dissipation fin 43 exposed to the outside air have a wide cross-sectional area, the heat dissipation efficiency is high, and thus the performance of the entire heat pipe 30 may be improved. In addition, since the heat pipe is embedded in the ball screw 10, the heat pipe is also rotated when the ball screw 10 is driven to rotate. At this time, the heat dissipation member 40 rotates to make contact with external air at room temperature. The cooling efficiency is further improved.

Therefore, the heat dissipation plate 41 is suited to the configuration efficiency and system stability of the entire cooling system, and the heat dissipation fin 43 or the heat dissipation blade allows contact with external air in a large area, and reduces air resistance during rotation. Of course you can choose the shape and size to make it.

In addition, it is preferable that the heat pipe is embedded in an inclined upward direction from the evaporation part to the condensation part when the heat pipe is embedded in the ball screw 10. Since the principle of the heat pipe is composed of a circulating cycle structure in which the refrigerant is moved to the condenser by evaporation of the refrigerant, and the refrigerant gas is cooled and liquefied in the condenser, and then delivered to the evaporator, the refrigerant cooled in the condenser is transferred to gravity by the evaporator. This is because it can be delivered more efficiently.

Second embodiment

5 is a view illustrating an enlarged cross-sectional view of a cooling device of a ball screw as another embodiment according to the present invention.

As shown in FIG. 5, the evaporation part of the heat pipe is inserted and embedded in the ball screw in the longitudinal direction, and the end of the condensation part is exposed to the outside of the ball screw 10, and the heat dissipation member 40 is disposed at the end of the heat pipe. ) Is mounted, and a fan 50 for absorbing heat generated from the heat radiating member 40 so as to face the heat radiating member 40 and dissipating it to the outside is mounted on a housing surrounding the heat radiating member 40. to be.

That is, when the ball screw 10 rotates, heat is generated by friction with the ball nut, and the heat pipe 30 embedded in the ball screw 10 absorbs the heat and absorbs the absorbed heat. The refrigerant in the evaporation section of the heat pipe is vaporized. The vaporized refrigerant gas has a high pressure, and since the condensation unit exposed to the outside is low in pressure, the refrigerant gas is moved from the evaporator to the condensation unit.

When the refrigerant gas moves to the condensation unit, the refrigerant gas condenses and liquefies again by the temperature of the condensation unit lower than the boiling point exposed to the outside, and the liquefied refrigerant finely wicks the wick structure on the inner wall of the heat pipe 30. The capillary phenomenon moves along the passage back to the evaporator. In this way, the frictional heat caused by the high speed rotation of the ball screw and the nut is discharged to the outside by the heat pipe 30 having a high heat transfer efficiency through the phase shift cycle of the refrigerant, and thus the heat deformation of the ball screw and the ball nut due to the frictional heat. It is effective to stop the stomach.

When the ball screw 10 is generally at or above room temperature, when the temperature is about 50 ° C. or more, a minute thermal displacement occurs, and the thermal displacement causes a problem in system operation, resulting in a problem of lowering productivity. Therefore, the refrigerant used in the present invention preferably has a boiling point of 20 ° C. to 60 ° C., and corresponds to freon, acetone, and the like. That is, it is desirable to measure the temperature at which the thermal displacement occurs in the operation of the ball screw 10 ball nut during operation of the machining center and to adopt the most suitable refrigerant.

In addition, as shown in FIG. 5, the cooling efficiency of the heat pipe is a problem of how much heat is emitted from the heat dissipation unit. The fan 40 is further provided to face the front surface of the member 40 to effectively absorb and release the heat generated by the heat dissipation member 40 to the outside. Since the speed of the fan 50 is related to the cooling efficiency, it is also possible to control the outside or to automatically control the temperature of the ball screw 10 by measuring the temperature.

Therefore, since the heat pipe partially embedded in the ball screw 10 is also rotated, it is preferable to mount the structure so that heat can be best released by rotation of the heat radiating member 40 and the fan 50 of the heat pipe.

As described above, if the cold rolling device of the ball screw proposed in the present invention is provided, the device configuration is much easier and the production cost is lowered, and the high efficiency and durability can be increased. In addition, there is an advantage that it is possible to prevent the performance degradation due to various oxidation and bearing penetration of the plant machinery by the cooling flow is not used.

While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

1 is a schematic diagram illustrating a configuration of a cooling device of a conventional ball screw,

2 is a view illustrating a configuration of a cooling device of a ball screw of a machining center according to the present invention;

3 is a view illustrating a brief configuration diagram of a heat pipe applied in the present invention;

4 is an enlarged cross-sectional view illustrating a structure of a cooling device of a ball screw according to the present invention;

5 is a view illustrating an enlarged cross-sectional view of a cooling device of a ball screw as another embodiment according to the present invention.

Description of the main parts of the drawing

10: ball screw, 20: ball nut, 30: heat pipe, 31: wick structure

40: heat radiating member, 41: heat sink, 43: heat radiating fin, 50: fan

Claims (10)

delete delete delete delete delete In the cooling device of the ball screw for transporting the structure, A heat pipe having one end inserted in the ball screw in the longitudinal direction; A heat dissipation member exposed at the other end of the heat pipe to the outside of the ball screw and coupled to the other end of the heat pipe; A fan for dissipating heat generated by the heat dissipation member to the outside by facing the heat dissipation member mounted on the housing and one side of the housing connected to the ball screw end so as to be spaced apart from the heat dissipation member at a predetermined distance; A temperature sensor for measuring the temperature of the ball screw; And And a control unit for controlling the rotational speed of the fan according to the temperature of the ball screw measured by the temperature sensor. The method of claim 6, And the heat pipe is a plurality of heat pipes inserted into the plurality of hollows through the ball screw. The method of claim 6, The refrigerant inserted into the heat pipe is a ball screw cooling apparatus, characterized in that the boiling point of 10 ℃ to 60 ℃. The method of claim 6, And the heat pipe is inserted into the hollow passing through the ball screw so as to rise in the distal direction from the ball screw center. The method of claim 6, The heat dissipation member coupled to the heat pipe end is a ball screw cooling device, characterized in that consisting of a heat sink and a plurality of heat dissipation fins or heat dissipation wings that are erected in a direction perpendicular to the heat sink.

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