JPS59118339A - Multi-spindle cooling device - Google Patents

Abstract

PURPOSE:To cool a main spindle device effectively and evenly by a method wherein operating liquid is flowed through a vapor pipe and a liquid pipe, having flexible parts, to transport the quantity of heat of a bearing stand from the hollow chamber thereof to a heat radiating device. CONSTITUTION:The quantity of heat of bearings 3, 31, which received the heat in the bearing stands 4, 41, is deprived as the latent heat of evaporation when it heats the operating liquid, such as Flon or the like, in the hollow chambers 7, 71 and evaporates it. The vapor of the evaporated Flon or the like moves to the heat radiating device 8 through the first and second vapor pipes 10, 101 having the flexible parts by utilizing the vapor pressure of itself and is cooled by a cooling fan 9. The condensed operating liquid returns into the hollow chambers 7, 71 of the bearing stands 4, 41 through the first and second liquid pipes 12, 121, having the flexible parts, as well as the first and second vapor pipes 10, 101 by utilizing the gravity of it.

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.

Conventional devices of this type include those shown in FIGS. 1 and 2. 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), (c) is the main axis, (3L(
31) is a bearing, (4Lt4υ is a bearing stand, (5L f51
+ is a pulley, and (6) is a bed.

Next, the operation will be explained. A driving electric motor (not shown) rotates the main shaft (2), C!l by the rotational force transmitted to the pulley (5) (5υ) via the V-belt.

At this time, the bearings (3), 11) located between the main shaft (2) lGiυ and the bearing stand (4), ←υ are connected to the main shaft (2L6!υ
The purpose is to help the bearings (3) and (31!) rotate smoothly, but as they rotate, the bearings (3) and (31!) generate heat due to friction and rise in temperature. Transferred to 4L (41), bed (6)
and radiates heat by transferring it to the surrounding air. At this time, the bearing stand (
4L +4]) increases in temperature, and various parts undergo various thermal deformations and strains due to thermal expansion. For this reason, the main axis (2).

+2]) position fluctuates, and the machining accuracy decreases when machining the workpiece. Further, there is a drawback that there is a difference in the positional fluctuations of the main shafts (2) and shij) 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 described 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.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Figure 8 is a block diagram showing the functional system.
The figures are cross-sectional side views, and in each of these figures, (7L
ff1l is a bearing stand (4) + (an annular hollow chamber formed inside the group, (8) is a heat dissipation device, and a cooling fan (9)
It is cooled by QO, (101) is a hollow chamber (7
), first and second steam pipes (i.e. ), (121) transfers the working liquid that is condensed and liquefied in the heat dissipation device (8) to the first and second steam pipes (
1 (!, (101) to the bearing stand (4), t4υ hollow chamber (7), (71+), respectively, and an expandable and contractible flexible part (12a) such as a bellows etc.
, (121a). This is the second liquid pipe.

In addition, the hollow chamber (7), συ and the heat dissipation device (8), the first.
2nd steam pipe QO, (101), 1st. Second liquid pipe (
2) After vacuum depressurizing the inside of (121), ammonia,
A predetermined amount of working fluid such as fluorocarbon is sealed inside.

Next, the operation will be explained. Bearing stand (4), (411
The heat of the bearing (3), (311) received by the hollow chamber (7
), σ1) When heating and vaporizing the working liquid such as fluorocarbon, it is taken away as latent heat of vaporization, and the vapor of the vaporized fluorocarbon uses its own vapor pressure to return to the first . Second steam pipe Q(1,
(101) to the heat dissipation device (8), where it is cooled by the surrounding 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 to the surrounding air, and the amount of heat from the bearings (3) and H is radiated to the surrounding air. The condensed working liquid is the first. Second liquid pipe @.

t121) and the first one using gravity. Second steam pipe 0
After passing through 0° (101), return to the bearing stand (4), +4]1 hollow chamber (7L (711).

By repeating this operation, the bearing 8 (
4) The amount of heat of r t411 is transported to the heat dissipation device (8) for efficient cooling.

By the way, when the temperature rise (calorific value) 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, causing the bearing pedestal (411) to increase in temperature. A larger amount of vapor than the working liquid in the hollow chamber (7+)
Steam pressure and steam temperature. Therefore, as the amount of steam increases, more latent heat of vaporization is taken away, and more cooling is achieved.
It works to suppress the temperature rise of the bearing pedestal (4) from becoming larger than that of the bearing pedestal (411).Then, the high temperature steam vaporized in the hollow chamber (7) of the bearing pedestal (4) is It moves to the heat dissipation device (8) through the steam pipe 00 and is condensed.On the other hand, the temperature rise in the bearing pedestal (41) is smaller than that in the bearing pedestal (4). The working liquid has a lower vapor volume, vapor pressure, and vapor temperature when vaporized than the working liquid in the hollow chamber (7) of the bearing stand (4).Therefore, it vaporizes in the hollow chamber συ of the bearing stand @υ. The lower temperature steam is the second
The steam passes through the 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 (6) and (121). through the second steam pipe (10° (101), respectively bearing pedestal (4) + 1++ (7) hollow chamber (7),
Return to ffl+. In other words, the working fluid at a lower temperature returns to the hollow chamber (7) of the bearing pedestal (4), and is cooled by the lowered temperature, reducing the temperature rise of the shaft pedestal (4). The working fluid at a higher temperature returns to the hollow chamber of t411, and is warmed by the increased temperature, increasing the temperature rise of the bearing pedestal (4) and increasing the temperature rise difference between the two bearing pedestals (4) and t411. By repeating this operation, both bearing stands (4) can be kept small.
When the calorific value/temperature rise of either one starts to increase,
It works to suppress the difference in temperature rise between both bearing stands (4) and (4II), and both bearing stands (4Lt4υ) are effectively cooled on the average. It is possible to minimize the span P between the spindle (2) and the spindle Qυ, and the flexible part (101) of the
0a).

(101a) and the flexible part (12a) of the liquid pipe (2) and (121).

It can be made variable within the expansion/contraction range of (121a).

In the above embodiment, a case was described in which a cooling fan (9) was used, but natural air cooling may be used without using a cooling fan (9), or cooling water, oil, etc. other than cooling air may be used as a cooling source. Similar effects can be obtained by using

Moreover, in the above embodiment, the flexible part (10a) +Q
oia), (12a), and (121a) are constructed of bellows, but the flexible portion that can be expanded and contracted may be constructed of something other than the bellows.

Further, in the above embodiment, the hollow chamber (7) and ff1l are the bearing pedestals (4).

We have discussed the cases in which (41) is provided, but
The hollow chamber (7>, Vυ) may be provided between the bearing (3) + c311 or between the bearing (3), 011 and the bearing stand (4L t4) 1.

Incidentally, in the above description, the case where there are two spindle devices has been described, but the present invention can also be applied to a case where there are three or more spindle devices, and the same effects as in the above embodiment can be obtained.

As described above, the present invention provides first and second shafts each having an annular hollow chamber formed inside the bearing pedestal and filled with a working fluid. A second main shaft device, a heat radiating device that radiates the heat of the first and second main shaft devices, and a second main shaft device that guides the vapor of the working liquid that is vaporized in the hollow chamber of the second main shaft device to the heat radiating device and expands and contracts. The first with a possible flexible part. Second
The working liquid, which is condensed and liquefied in the steam pipe and heat dissipation device, is transferred to the first. The first steam pipe passes through the second steam pipe. The first spindle has flexible parts that are respectively guided into the hollow chambers of the second spindle device and are extendable and retractable. By providing a second liquid pipe and transporting the heat of the bearing pedestal from the hollow chamber to the heat dissipation device, the heat of the bearing can be rapidly removed and cooled efficiently and evenly. It has an extremely large practical effect of suppressing deformation and distortion to a minimum and improving the machining accuracy of machine tools.

[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. 3 and 4 are a block diagram and a cross-sectional side mill showing a multi-shaft cooling device according to an embodiment of the present invention. It is. In the figure, (1), Q]) is $1. Second spindle device, (41+ (411 is bearing stand, (7)! 11[+
is the hollow chamber, (8) is the heat dissipation device, 01, (101,) is the first. The second steam pipe, (10a) and (101a) are flexible parts, and the first steam pipe (2) and (121) are flexible parts. The second liquid pipes (12a) to (121a) are flexible parts. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 3 Figure 8 11 Figure 4

Claims (4)

[Claims] (1) The first bearing part has an annular hollow chamber formed inside the bearing part 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 main shaft device has a flexible portion that guides the vapor of the working liquid vaporized in the hollow chamber of the second main shaft device to the heat radiating device, and has an expandable and contractible flexible portion. A second steam pipe transfers the working liquid to be condensed and liquefied in the heat dissipation device to the first steam pipe. The first steam pipe is passed through the second steam pipe. The first spindle has flexible parts that are respectively guided into the hollow chambers of the second spindle device and are extendable and retractable. A multi-axis cooling device comprising a second liquid pipe. (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, wherein the hollow chamber is formed in a bearing. (4) The multi-shaft cooling device according to claim 1, wherein the hollow chamber is formed between the bearing and the bearing stand. 5) The multi-axis cooling device according to any one of claims 1 to 4, wherein the flexible portion is constructed of a bellows.