JPS59118325A - Mutli-spindle cooler - Google Patents

Abstract

PURPOSE:To cool a main spindle device effectively and evenly, by a method wherein a working liquid is passed through a heat exchanger liquid tube having flexible part, and a calorific value of a bearing rest is transmitted to a radiator from a hollow chamber. CONSTITUTION:Calorific values of bearings 3-31 which received heat by bearing rests 4-41 are taken away as evaporation latent heat when a working liquid such as Flon in hollow chambers 7-71 is made to evaporate by heating the working liquid. Vapor such as the evaporated Flon is moved to a radiator 8 through the inside of a first and second heat exchanger tubes 10-101 having flexible parts by making use of its own vapor pressure and cooled by a cooling fan 9. The condensed working liquid is returned to the hollow chambers 7-71 of the bearing rests 4-41 by moving along inner walls of the first and second heat exchanger tubes 10-101.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-shaft cooling device for cooling the bearings of a plurality of main shafts of a machine tool. There was something. In each of these figures, (1) and (11) are the first,
This is a second spindle device and is arranged at intervals of span P. (2), (21) are main axes, (3), (31) f-1
: Bearing, (4), (41:H” bearing stand, (5), (51
) is the pulley, and (6) is the fd bed.

Next, the operation will be explained. The main shafts (2), (21) are rotated by the rotational force transmitted to the pulleys (5), (51) via a V-belt by a driving electric motor (not shown).

At this time, the main shafts (2), (21) and bearing stands (4), (41
) are the bearings (3) and (31) located between the main shaft (2)
, (21) rotate smoothly, but as the bearings (3) and (31) rotate, they generate heat due to friction and their temperature rises. The amount of heat generated in the bearings (3), (31) is transmitted to the bearing stands (4), (41), and the bed (6)
and radiates heat by transferring it to the surrounding air. In addition to this, the bearing stand (
4) and (41), the temperature rises, and the valleys develop various shapes and distortions due to thermal expansion. For this reason, the main shaft (2), (21)
This has the drawback that the position of the machine fluctuates, reducing machining accuracy when machining the workpiece.

Furthermore, f at the position of the principal axes (2) and (21) between the two
1) who are making a difference in the order and at the same time undergoing revisions)
There was a drawback that there was a difference in the degree of machining from one to the other.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and provides a multi-shaft cooling device that can effectively and evenly cool the first and second main shaft devices. It is intended to provide.

Below is an example of this invention! 43 and 41, (7) and (71) are scale-shaped hollow chambers formed inside the bearing stands (4) and (41), (8) is a heat dissipation device, and a cooling fan (9). It is cooled by (10) , (
101) guides the vapor of the working liquid that vaporizes in the hollow chambers (7) and (71) to the heat radiating device (8), respectively, and also guides the working liquid that is condensed and liquefied in the heat radiating device (8) to the bearing stand (4).
, (41), respectively, and has 7 lexigular parts (10a), (101a), which are capable of expansion and contraction, such as bellows, etc. It's a heat tube.

Note that after reducing the pressure inside the hollow chambers (7), (71), the heat dissipation device (8), and the first and second heat transfer tubes (10) and (101), working liquids such as ammonia and chlorofluorocarbons are released inside them. A predetermined amount is enclosed in.

Next, I will explain the previous work. The amount of heat received by the bearings (3), (31) in the bearing stands (4), (41) is transferred to the hollow chamber (7),
During the process of heating and vaporizing the working liquid such as fluorocarbons in (71), it is taken away as latent heat of vaporization, and the vaporized fluorocarbons, etc., are transferred to the first and second heat transfer tubes (10 )
, (101) to the heat dissipation device (8), and is cooled by the surrounding air by the cooling fan (9). At this time, the vapor of fluorocarbon or the like condenses and returns to liquid, but the condensed heat is released to the surrounding air, and the amount of heat from the bearings (3) and (31) is radiated to the surrounding air. @ Shrinked work
The hollow chambers of the bearing stands (4), (41) are
7), return to (71).

By repeating this fx operation, the heat forging of the bearing stands (4) and (41) is transferred to the heat radiating device (8) and efficiently cooled.

By the way, when the temperature rise (heat i) of the bearing pedestal (4) becomes larger than that of the other bearing pedestal (41), the working liquid in the hollow chamber (7) of the bearing pedestal (4) vaporizes and the bearing pedestal (41)
The amount of vapor, vapor pressure, and vapor temperature are larger than that of the working liquid in the hollow chamber (71). Therefore, a larger amount of evaporative heat is taken away by the amount of steam that is smaller, thereby cooling the bearing pedestal (4) to a greater extent than the bearing pedestal (41). And the bearing stand (4)
The high temperature steam vaporized in the hollow chamber (7) of is the first heat transfer 'i! (10) The inside is removed and transferred to the heat dissipation device (8) where it is condensed and liquefied. On the other hand, the bearing stand (41) is the bearing stand (41).
), the temperature rise is smaller than in the hollow chamber of the bearing stand (41) (
The working liquid in the fan 71) has a lower vapor amount, vapor pressure, and vapor temperature than the working liquid in the hollow chamber (7) of the bearing stand (4). Therefore, the low-temperature steam vaporized in the hollow chamber (71) of the bearing stand (41) passes through the second heat transfer tube (101), moves to the heat dissipation device, and is condensed and liquefied.

However, high-temperature steam has a high temperature when condensed and liquefied, and low-temperature steam has a low temperature when condensed and liquefied. Heat dissipation device (August) A high-temperature condensed liquefied working liquid and a low-temperature condensed liquefied working liquid are mixed to form an averaged working liquid of m degrees. The liquid flows through the first and second heat transfer tubes (10) and (10).
Bearing stands (4) and (41) are respectively transmitted along the inner wall of 1).
Returns to the hollow chamber (power, (71). In other words, the working fluid at a lower temperature returns to the hollow chamber (7) of the bearing pedestal (4), is cooled by the lowered temperature, and is ) decreases, and the temperature rise in the hollow chamber (71) of the bearing stand (41) + 1 becomes higher.The liquid returns and is warmed by the increased temperature. The temperature rise of the stand (41) is increased, and the increase in solubility of both bearing stands (4) and (41) is suppressed to a small level. By repeating this operation, both bearing stands (4) and ( 41) is suppressed to a small level, and both bearing stands (4) and (41) are effectively cooled on the average.Therefore, in machine tools, the thermal Y shape and distortion of the bearing part can be minimized. The machining accuracy can be improved.
1) and the span P of the first and second heat exchanger tubes (10), (
10i) within the expansion and contraction range of the flexible parts (lOa) and (lOla). It can be made into T-hen.

In the above embodiment, a case was described in which the cooling fan (9) was used, but recirculating air cooling may be used without using the cooling fan (9), or cooling water, oil, etc. other than the cooling air may be used as the cooling source. Even if used, similar young fruits will be produced.

Furthermore, in the above embodiment, the flexible parts (10a) and (1
01a) is configured with bellows, but
The flexi-guru part, which can be used for 11 minutes, may be configured with something other than the bellows.

Furthermore, in the above embodiment, the condensed working liquid returns to the hollow chambers (7), (71) using gravity through the inner walls of the first and second heat transfer chambers (10) and (101). In the case (as mentioned above, the first, stone 2 heat transfer tube (4o), (10
A porous material may be attached to the inner wall of 1) to return the condensed working liquid to the hollow chambers (7) and (71) using capillary action. (7), (71) are provided in the bearing stands (4), (41), respectively.
), or bearings (3), (31) and bearing stands (4), (
41).

By the way, in the above explanation, the case in which the number of rt spindle devices is 2; to play.

As explained above, the present invention includes first and second main shaft devices each having a hollow chamber formed inside a bearing portion and having a hollow chamber in the shape of a hollow chamber in which a liquid is sealed; A heat dissipation device for dissipating the heat amount of the device; First and second heat transfer liquid pipes each guided into the hollow chamber of the second main shaft device and each having a flexible part that can be expanded and contracted are provided to transport the heat of the bearing stand from the hollow chamber to the heat radiating device. By doing so, it is possible to quickly remove the aging of the bearing part and cool it efficiently and evenly, thereby minimizing thermal deformation and distortion of the bearing part.
L L There is a problem with improving the 4n degree of machining of machine tools, etc.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional multi-axis cooling device: y?
The L stone side view, the normal Ctzz view, and FIGS. 3 and 4 are a block diagram and a sectional side view showing a multi-axis cooling device according to an embodiment of the present invention. In the figure, (1) and (11) are the first and second spindle devices, (4) and (41) Id l[lI '! - stand, (7
), (71) ID room 9, (8) H radio fi device i&,
(10), (101) ID No. 1.5 FJ2 heat exchanger tube,
(10a) and (101e,) are flexible parts. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3 Figure 8 4th C1

Claims (1)

[Scope of Claims] (1) First and second main shaft devices each shouldering an annular medium formed inside the bearing portion and in which a working liquid is sealed; the first and second main shafts; A heat dissipation device for dissipating the heat of the device, guiding the vapor of the working liquid vaporized in the hollow chambers of the first and second main shaft devices to the heat dissipation device d, and condensing and liquefying the working liquid in the heat dissipation device. 1st and 2nd above
1. A multi-shaft cooling device comprising first and second heat transfer tubes each guided to a central chamber of a main shaft device and each having a flexible portion with a telescopic section. (2) The multi-shaft cooling device according to claim 1, wherein the hollow chamber is formed in a bearing stand. (3) The multi-shaft cooling device according to claim 1, characterized in that the hollow chamber is formed between the bearing and the bearing stand. (4) The hollow chamber is formed between the bearing and the bearing stand. A multi-axis cooling device according to claim 1. (5) The multi-axis cooling device according to any one of claims 1 to 4, wherein the flexible portion is constituted by a bellows.