JPS59118335A - 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 transporting pipe having flexible parts to transport the quantity of heat of a bearing stand from a hollow chamber 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 while the vapor of the evaporated Flon or the like moves to the heat radiating device 8 through first and second vapor pipes 10, 101 having the flexible parts by utilzing 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 joining and branching pipes of the liquid pipe 12 having the flexible parts 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.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2. In each of these figures, Q) and 01) are @1. of the machine tool. It is a second spindle device and is arranged at intervals of span P. (2), December is the main axis, (3)
.

3]) is the bearing, (4), (April main bearing stand, (5)
, (6]) is a pulley, and (6) is a bed.

Next, the operation will be explained. The main shafts (2) and (2υ) are rotated by the rotational force transmitted to the drive motor (not shown) through the belt (5) and +5υ.

At this time, the main 4111+ (2), (21) and the bearing stand (
4) , (The bearings (3) and 6υ located between the four have the purpose of helping the main shaft (2) and el) rotate smoothly, but as they rotate, the bearings (3) and 6υ
υ generates heat due to friction and its temperature rises. Bearing (3),
The amount of heat generated at &υ is the bearing stand (4), ! 4υ, and is transferred to the bed (6) and the surrounding air to radiate heat. At this time, the temperature of the bearing stand (4) and (4υ) rises, and each part undergoes significant thermal deformation and distortion due to thermal expansion.For this reason, the main shaft (2).

There was a drawback that the position of (21) fluctuated and the machining accuracy decreased when machining the workpiece. Furthermore, there is a drawback that there is a difference in the positional fluctuations of the main shaft (2) and the shaft η, and at the same time, there is a difference in the machining accuracy when a plurality of machining operations are performed. - This invention has been made to eliminate the above-mentioned drawbacks of the conventional ones. 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. 8 and 4. Figure 3 is a block diagram showing the functional system, Figure 4
The figure is a cross-sectional side view υ, and in each of these figures, (7)
, (71) is an annular hollow chamber formed inside the bearing stand (4), ≠υ, (8) is a heat dissipation device, and a cooling fan (
9). ace, (tot)
Lt hollow chambers (7), (7]) respectively guide the vapor of the working liquid to the heat dissipation device (8), and a flexible part (10a) that can be expanded and contracted, such as a bellows;
(101a). The second steam pipe, α power, is a heat dissipation device (the working liquid that condenses and liquefies at 8 tons is transferred to the bearing stand < 4),
The hollow chamber (7) of t41) divides the flow into συ and guides the flow, and also includes an expandable and contractible flexible part such as a bellows (
12d), and is composed of a confluence pipe (12a), a branch pipe (12b), and (12c).

In addition, the hollow chambers (7), (71) and the heat dissipation device (8)
, 1st. After the interior of the second steam pipe (H), (101) and liquid pipe is reduced in pressure by vacuum, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed therein.

Next, the operation will be explained. Bearing stand (4), (4υ
The amount of heat received by the bearings (3), 81) in the hollow chamber (7
), When the working liquid such as fluorocarbons in (c) is heated and vaporized, it is taken away as latent heat of vaporization n, and the vapor of the vaporized fluorocarbons uses its own vapor pressure. 2nd steam pipe QC)
, (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 they release latent heat of condensation to the surrounding air, and the heat of the bearing (3) and G3υ is radiated to the surrounding air. The condensed working liquid is transferred to the confluence pipe (12a) of the liquid pipe (b).

It returns to the hollow chambers (7) and (to) of the bearing stand (4) and t41) by using gravity via the branch pipes (12b) and (12c). By repeating such an operation, the amount of heat from the bearing stands (4) and (41) is transported to the heat radiating device (8) and efficiently cooled.

By the way, if the temperature rise (calorific value) of the bearing pedestal (4) is larger than that of the other bearing pedestal (4), the working liquid in the hollow chamber (7) of the shaft and pedestal (4) will vaporize. A larger amount of vapor than the working liquid in the hollow chamber (7) of the bearing stand Uυ
Steam pressure and steam temperature. Therefore, a large amount of latent heat of vaporization is taken away by the amount of vapor, and the cooling is greatly increased.
It works to suppress the temperature rise of the bearing pedestal (4) from becoming larger than the bearing pedestal (4υ).Then, the high temperature steam vaporized in the hollow chamber (7) of the bearing pedestal (4) is The steam moves to the heat dissipation device (8) through the steam pipe a0 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 temperature rise in the bearing pedestal υ is small. The working fluid flows through the bearing 8 (
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 (c) of the bearing stand Qυ moves to the heat dissipation device (8) via the second steam w (101), 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 passed through the liquid pipes (12a), branch pipes (12b), and (12c) to the bearing pedestal (4).
, (Returns to the hollow chambers (7) and (2) of 4υ. In other words, the working fluid at a lower temperature returns to the hollow chamber (7) of the bearing stand (4), and is cooled by the lower temperature. and the bearing stand (
4) The temperature rise of the bearing stand (4) is reduced and the hollow chamber (2)
The working fluid at a flattened temperature is returned, and the temperature rise of the bearing base Ql,l increases as it warms up by the increased temperature.
Both bearing stands (4) (4υ temperature rise difference can be kept small. By repeating this operation,
When the heat generation and temperature rise of either the double bearing stand (4) or the knife starts to increase, the double bearing stand (4) works to keep the difference in temperature rise between t4υ small, and the double bearing stand (4) ).

Gυ is effectively cooled on 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. In addition, the main shaft (
2) and the main shaft (2]) are 1° and the second steam pipe QOj, the flexible part (10a) of (101).

(101a) and the flexible part of the liquid pipe (6) - (1
It can be made variable within the expansion/contraction range of 2d).

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).

Although the case where (101a) and (12d) are configured with bellows has been described, a flexible part that can be expanded and contracted may be configured with something other than bellows.

In addition, in the above embodiment, the hollow chamber (7) is connected to the bearing stand (4).
).

I mentioned the case where (41) is set to 0, but
Hollow chamber (7), (to) bearing (3), G31) or bearing (3), <3υ and bearing stand (4), (4
It may also be provided between υ.

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.

The present invention provides the above-described first through hole, which has an annular hollow chamber formed inside the bearing pedestal, and into which a working fluid is sealed. a second main shaft device, a heat radiating device for radiating heat from the heat point of the first second main shaft device; The first part has a flexible part that is both guiding and expandable. Second
The working liquid, which is condensed and liquefied in the steam pipe and heat dissipation device, is transferred to the first. By providing a liquid pipe with a flexible part that can be expanded and contracted to guide the flow by dividing it into the hollow chamber of the second main shaft device, the amount of heat in the bearing pedestal is transported from the hollow chamber to the heat dissipation device. Since the amount of heat can be quickly, efficiently and evenly cooled by 4 f, thermal deformation and distortion of the bearing portion can be suppressed to a minimum and the machining accuracy of machine tools can be improved, which is extremely effective in practical terms.

[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 sectional ml side view showing a multi-shaft cooling device according to an embodiment of the present invention. This is the cause. In the figure, (1), Ql) is the first. The second spindle device, (4), (4]) is a bearing stand, (7), (
7]) is a hollow chamber, (8) is a heat dissipation device Ql), (10
1) is 'g1. 1st. Steam pipe, (10a)1. (1
01a) is the flexible part, (2) is the liquid pipe, (12a)
is a confluence pipe, (12b), (12c) is a branch pipe, (1z
a) is a flexible part. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - 203 Figure 1 Figure 2 Figure 3] 11 Figure 4-20.

Claims (5)

[Claims] (1) The first part has an annular hollow chamber formed inside the bearing part and in which the working fluid is sealed. a second spindle device; - the first spindle device; a radiating device δ for radiating the heat 14 of the second main 4qil device; Second Lord i! The first part has a flexible part that can be expanded and contracted and that guides the vapor of the working liquid that is vaporized in the hollow chamber of the 11O device to the heat dissipation device. A second steam pipe transfers the working liquid to be condensed and liquefied in the heat dissipation device to the first steam pipe. A multi-shaft cooling device, characterized in that it is equipped with a liquid pipe having a flexible part that can be expanded and contracted and that divides and guides the flow into a hollow chamber of a second main shaft device; (2) A multi-shaft cooling device according to claim 1, characterized in that the hollow chamber is formed by a bearing stand 1t. (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 part is constituted by a bellows.