JPS59118329A - Multi-spindle cooler - Google Patents

Abstract

PURPOSE:To cool a main spindle device effectively and evenly, by a method wherein a working liquid is streamed to a vapor tube, a liquid tube and a connecting tube, and a calorific value of a bearing part 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 vapor tubes 10-101 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 through liquid tubes 12-121. The liquid tubes 12-121 are connected through a connecting tube 13 with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-shaft cooling device that cools bearing parts such as a plurality of main shafts of a machine tool, for example.

Conventionally, this birch device has been shown in FIGS. 1 and 2. In each of these figures, (1), (1υ are the first and second spindle devices of the machine tool, which are arranged at intervals of P and span P. (2), (2υ are the main spindle, (3
).

6υ is a bearing, (4), Cu imaginary bearing stand, (5), (5
υ is a pulley and (6) is a bed.

Next, the operation will be explained. Boo 1) (5), (61) is connected to a drive motor (not shown) via a V-belt.
The rotational force V transmitted to the main shaft (2), 12υ
Rotate.

At this time, main shaft < 2), f2υ and bearing stand (4),
(Bearings (3) and 13U located between 4υ and 4υ have the purpose of helping the main shaft (2) and υ rotate smoothly, but as they rotate, bearings (3) and 13U generate heat due to friction and their temperature rises. The heat generated in the bearing (3), 6υ is transferred to the bearing stand (4), G[), and the bed (
6) and radiates heat by transferring it to the surrounding air. At this time, the temperature of the bearing stand (4) and the shaft rises, and various parts undergo various thermal deformations and strains due to thermal expansion. For this reason, the main axis (2).

There was a drawback that the position of the mark fluctuated and the machining accuracy decreased when machining the workpiece. Furthermore, there is a drawback in that there is a difference in the mounting of the main shafts (2) and (2υ) between them, and at the same time, there is a difference in the machining accuracy when performing a plurality of machining operations.

This invention was made in order to eliminate the drawbacks of the conventional ones as mentioned above. It is an object of the present invention to provide a multi-shaft cooling device that can effectively and evenly cool a second main shaft device.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 and 4. Figure 3 is a block diagram showing the functional system, Figure 4
The figure is a cross-sectional side view, and in each figure, (7
), (71f is a bearing stand (4), an annular hollow chamber formed inside uυ, (8) is a heat dissipation device, which is cooled by a cooling fan (9).QQ, (10
1) guides the vapor of the working liquid vaporized in the hollow chambers (7) and (71) to the heat dissipation device (8), respectively. Second
steam pipe, @.

(121) transfers the working liquid that is condensed and liquefied in the heat dissipation device (8) to the bearing stand (4), the hollow chamber (7) of t4υ, (7υ
These are first and second liquid pipes that guide the mouth and mouth of the niso. Q3 is a communication pipe that communicates the first liquid pipe @ and the second liquid pipe (121).

In addition, the hollow chambers (7), (71) and the heat dissipation device (8, 1st, 2nd steam pipe Ql, (101), 1st.
After the inside of the second liquid pipe α4° (121) is vacuum depressurized, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed inside the second liquid pipe α4° (121).

Next, the operation will be explained. Bearing 'i & (4), (4υ
The amount of heat received by the bearing (3), C(υ is
), V]) When heating and vaporizing the working liquid such as fluorocarbons, it is taken away as latent heat of vaporization, and the vapor of the vaporized fluorocarbons utilizes its own vapor pressure. It passes through the second steam pipe 1.10, (101) to the heat dissipation device (8) and is cooled by the ambient air by the cooling fan (9). At this time, vapors such as fluorocarbons condense and return to liquid, but the latent heat of condensation is released into the surrounding air, causing the bearing (3), 0
The amount of heat υ is radiated to the surrounding air. The condensed working liquid is the first. The bearing stand (4) is passed through the second liquid pipe (Ld, (121)) using gravity.

Return to the hollow chambers (7) and (2) of Ω〃. By repeating this operation, the amount of heat from the bearing stands (4) and H is transferred to the heat dissipation device (8) for efficient cooling.

By the way, if the temperature rise (heat amount) of the bearing stand (4) becomes larger than that of the other bearing stand, the hollow chamber (of the bearing stand (4)
7) When the working liquid in the hollow chamber of the bearing stand Cυ (
7]) Larger vapor volume, vapor pressure,
Steam temperature. Therefore, a large amount of latent heat of vaporization is taken away by the large amount of steam, and a large amount of cooling is achieved.
It works to suppress the temperature rise in 4) from becoming larger than the bearing stand height υ. The high temperature steam vaporized in the hollow chamber (7) of the bearing stand (4) moves to the heat dissipation device (8) via the first steam pipe 00 and is condensed and liquefied. On the other hand, the temperature rise of the bearing pedestal υ is smaller than that of the bearing pedestal (4), and the bearing pedestal (
The working liquid in the hollow chamber (71) of 111) is transferred to the bearing stand (4).
The amount of vapor, vapor pressure, and vapor temperature during vaporization are lower than that of the working liquid in the hollow chamber (7). Therefore, the low temperature steam vaporized in the hollow chamber συ of the bearing base 0υ is transferred to the second steam pipe (
101) to the heat dissipation device (8) where it 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. In the heat dissipation device (8), the high temperature condensed liquefied working liquid and the low temperature condensed liquefied working liquid are mixed to form a working liquid having an average temperature. The working liquid at this averaged temperature is transferred to the first and second liquid pipes (2) and (121), respectively, to the pedestal (4).

Return to hollow chambers (7) and (c) in (41). That is, the working fluid at a lower temperature returns to the hollow chamber (7) of the bearing pedestal (4), and as a result, the temperature rise of the bearing pedestal (4) is reduced, and the temperature rise of the bearing pedestal (4) is reduced. The working fluid at a higher temperature returns to the 4υ hollow chamber (2) and is warmed by the increased temperature, increasing the temperature rise of the bearing pedestal and causing both bearing pedestals (
4).

44]) cannot be kept small.

As this operation is repeated, the bearing stand (4
The amount of working fluid in the hollow chamber (7) on the ) side decreases and the amount of working fluid in the hollow chamber (2) on the bearing stand Ωυ side increases, but due to the rise of the communicating pipe α, the heat dissipation device (8) A part of the working liquid that returns from the hollow chamber (2) on the bearing stand υ side can be returned to the hollow chamber (7) on the bearing stand (4) side, so that the amounts of both working liquids are kept at a predetermined level. working in By repeating this operation, the temperature of both bearings 8 (4) + ('υ's 10,000 heat generation unit / When the temperature rise starts to increase, the temperature of both bearing stands (4), f4]) will increase. It works to keep the difference small, and both bearing stands (4) and I4υ are effectively cooled on the average. Therefore, in the machine tool, thermal deformation and distortion of the bearing portion can be suppressed to a minimum, and machining accuracy can be improved.

Incidentally, in the above embodiment, the case where the cooling fan (9) is used is described. A similar effect can be obtained by using the following.

Further, in the above embodiment, the hollow chamber (7) and (7υ are the bearing pedestals (4)).

We have described the case where the hollow chamber (7), (7υ and bearing (3), G3υ or bearing (3), 1. (υ and bearing stand (4), ( 2) may be provided with son(:'n).

By the way, in the above description, the case where there are two spindle devices is described, but the present invention can also be applied to a case where there are eight or more spindle devices, and the same effects as in the above embodiment can be obtained.

The present invention is characterized by the first through-hole 9 having an annular hollow chamber formed inside the bearing portion and filled with a working liquid. a second main shaft device, a heat radiating device that radiates heat from the first main shaft device, and a second main shaft device that guides the vapor of the working liquid vaporized in the hollow chamber of the second main shaft device to the heat radiating device, respectively. 1st. a second steam pipe, a first liquid pipe and a second fi, which guide the working liquid condensed and liquefied by the heat dissipation device into the hollow chambers of the first and second main shaft devices, respectively; By providing a communication pipe that communicates the liquid pipes and transporting the heat of the bearing part from the hollow chamber to the heat radiating device, the heat of the bearing part can be rapidly removed and cooled efficiently and evenly. This has an extremely large practical effect in that thermal deformation and distortion of the bearing part can be suppressed to a minimum and the machining accuracy of machine tools can be improved.

[Brief explanation of the drawing]

1 and 2 are a cross-sectional side view and a front view showing a conventional multi-shaft cooling device, and FIG. 8 and FIG. 4 are a block diagram and a cross-sectional side view showing a multi-shaft cooling device according to an embodiment of the present invention. It is. In the figure, (1), (1υ is the first and second spindle device, (4), Ω is the bearing stand, (7), n is the hollow chamber,
(8) is the heat dissipation device α0, and (101) is the first heat dissipation device α0. The second steam pipes (12, (121) are the first and second liquid pipes. The same reference numerals in the figures indicate the same or corresponding parts. Agent Nobu Kuzuno - Figure 1, Figure 2 Figure 3 Figure 8 Figure 4 3 12.121

Claims (4)

[Claims] (1) The first bearing has an annular hollow chamber formed inside the bearing and in which the working liquid is sealed. a second spindle device;
Above 1. a heat radiating device that radiates heat from the second spindle device;
Above 1. The first one guides the vapor of the working liquid vaporized in the hollow chamber of the second main shaft device to the heat radiating device. Second steam pipe-1 The working liquid that is condensed and liquefied in the heat dissipation device is transferred to the first steam pipe. The first one guided respectively into the hollow chamber of the second spindle device.
．． A multi-axis cooling device comprising: a second liquid pipe; and a communication pipe that communicates the first liquid pipe with the second liquid pipe. (2) The multi-shaft cooling device according to claim 1, wherein the hollow chamber is formed in the bearing stand. (3) The multi-shaft cooling device according to claim 1, wherein the hollow chamber is formed in the bearing. (4) The multi-shaft cooling device according to claim 1, wherein the hollow chamber is formed between the bearing and the bearing stand.