JPS59118353A - 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 vapor pipes, liquid pipes and a communicating pipe, having flexible parts respectively, to transport the quantity of heat of bearings from the hollow chambers thereof to heat radiating devices. CONSTITUTION:The quantity of heat of the bearings 3, 31, which received the heat in 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 vaporizes it. The vapor of the vaporized Flon or the like moves to the heat radiating devices 8, 81 through the vapor pipes 10, 101 and is cooled by fans 9, 91. The condensed operating liquid returns into the hollow chambers 7, 71 of the bearing stands 4, 41 from the liquid pipes 12, 121 through the vapor pipes 10, 101. The liquid pipes 12, 121 are communicated mutually through a communicating pipe 13 having the flexible part.

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 C-type devices include those shown in FIGS. 1 and 2. In each of these figures, Il+.

(11) is the machine tool's shaft and second spindle device, which are arranged at an interval of span P. +2+, I2υ is the main shaft, +31, ((υ is the bearing, +41, (4F
) is the bearing stand, (5), the glue is the pulley, and (6) is the bed.

Next, the operation will be explained. The main shaft +21, (211) is rotated by the rotational force transmitted by the driving electric motor (not shown) to the boot 51, f51) via the V-belt roller. At this time, the main shaft +21, t21) and the bearing stand i41, (t]) bearing (11, l
3tl is the main shaft (2), which has the purpose of helping the shaft rotate smoothly, but as it rotates, the bearings t31, 31
) generates heat due to friction and its temperature rises. Bearing +a+,
The amount of heat generated in e is transmitted to the bearing stands (4) and (6), and then to the bed (6) and the surrounding air, where the heat is radiated. At this time, the temperature of the bearing stands (4) and (6) increases, and various thermal deformations and strains occur in each part due to thermal expansion. Therefore, the main axis t21
, when the position of H changes and the workpiece is machined, K
There was a drawback that machining accuracy decreased. Furthermore, there is a drawback that there is a difference in the positional fluctuations of the main spindles 2j, 121) and a difference in the machining accuracy when a plurality of machining operations are performed.

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

Is the following an example of this invention? This will be explained based on FIGS. 3 and 4. Figure 8 is a block diagram showing the functional system.
Figure 4 is a cross-sectional side view. In each of these figures, i7+
, σl) is an annular hollow chamber formed inside the bearing stand (4), B+, Ba+) is a heat dissipation device, and is cooled by a cooling fan t9), [911K.

The LIOI is a steam pipe (101) that communicates the hollow chamber (7) with the heat dissipation device (8υ) and has a flexible part (10a), such as a bellows, etc.
is a hollow chamber, 7I! and the heat dissipation device (8), and a flexible part (101) that can be expanded and contracted, such as a bellows.
a) a second steam pipe having (12) a heat dissipation device (8);
The liquid pipe (1
21) is a heat dissipation device! 81) and the second steam pipe (101), the second liquid pipe Q31 communicates the liquid pipe 021 and the second liquid pipe (121), and is made of an expandable and contractible flexible pipe such as a bellows. Part (lla) -f with-j
It is a communicating pipe.

What, hollow chamber t71, (71+ and heat dissipation device t8)
, ! al, ol, second steam pipe t! 01, (
101), ol, second liquid"t 1121, (1
-21) After the pressure inside the communication pipe (13) is reduced, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed therein.

Next, the operation will be explained. Bearings that received heat in bearing stands (4) and (9) +3), (The amount of heat in Q is hollow chamber f7),
When heating and vaporizing the working liquid such as fluorocarbons in the rt+), it is treated as latent heat of vaporization, and the vaporized fluorocarbons and other vapors are passed through the ol steam pipe (10) by making full use of their own vapor pressure. The cooling fan (9) moves to the heat dissipation device (81), passes through the second steam pipe (lOl), and moves to the heat dissipation device (8).

191) and is cooled by the surrounding air. At this time,
Vapors such as fluorocarbons tI'i condense and return to liquid, but they release the latent heat of condensation to the surrounding air, and the heat of the bearing (31, !31J) is radiated to the surrounding air.The condensed working liquid is

Second liquid pipe IJ21. From (121), through the second steam pipe (Oi, (1013), return to the bearing stand (4) and the hollow chamber (71, t71) of the Foundation using gravity. By repeating this process, the bearing stand (4)
, (6) is transported to the heat dissipation devices 181) and (8) for efficient cooling.

By the way, if the temperature rise (calorific value) of the bearing pedestal (4) is larger than that of the other bearing pedestal (41), the amount of vapor during vaporization of the working liquid in the hollow chamber (7) of the bearing pedestal (4) will decrease. Steam pressure/
The steam temperature becomes higher than the other. Therefore, it absorbs a large amount of latent heat of vaporization, cools the bearing pedestal 14) to a greater extent, and works to suppress the temperature rise of the bearing pedestal (4) from becoming larger than that of the other shaft (6).

Then, the high temperature steam vaporized in the hollow chamber (7) of the shaft 98141 moves to another heat radiator through the O1 steam pipe (lO), and the working liquid condensed in the heat radiator (8I) radiates heat. The temperature is higher than that of the working liquid condensed in the device (8),
From the second liquid pipe to the second steam pipe (101) 2, the bearing stand (
6) into the hollow chamber (1υ). Therefore, the bearing stand (6)
In this case, the working liquid is warmed by the higher temperature, increasing the temperature rise, and the difference in temperature rise between the two bearing stands (4) and the bearing stand (4) is suppressed to a small value. In addition, the temperature rise in bearing pedestal 0- is smaller than that in bearing pedestal (4), and the hollow chamber (71) of bearing pedestal (foundation)
The working liquid in the bearing stand (4) has a lower vapor amount, vapor pressure, and vapor temperature when vaporized than the working liquid in the hollow chamber (7) of the bearing stand (4). Therefore, the second steam pipe; (101), the heat dissipation device (8)
, a working liquid at a lower temperature flows from the liquid pipe 0 through the vapor pipe (lO). As a result, the bearing stand (4
), the working fluid is cooled by the lower temperature and the temperature rise is reduced, and the difference in temperature rise between both bearings f3 (4) and (6) is kept small. As this operation is repeated, the amount of working fluid in the hollow chamber (7) of the bearing pedestal 14 gradually decreases, and the amount of working fluid in the hollow chamber 171) of the bearing pedestal (6) decreases.
Although the amount of J liquid increases, it is passed from the heat dissipation device (81) through the second steam pipe (101) through the communication pipe (I31) to the bearing stand (
6) A part of the working liquid that returns to the hollow chamber Vυ is transferred to the bearing stand (4
) into the hollow chamber (7), which serves to bring the quantity of both working liquids to a predetermined level. By repeating such operations, if the heat generation amount and temperature rise of either of the bearing stands (4) and (b) begins to increase, the difference in temperature rise between the two bearing stands (4) and (b) will increase. It works to keep the temperature to a minimum, and both bearing stands (41, (Incorporated) are effectively cooled on average. Therefore, in machine tools, thermal deformation and distortion of the bearing can be kept to a small extent, and machining Accuracy can be improved.

Change the span P between the spun spindle (2) and the spindle -.

Second steam pipe (1 (1), [1011, communication pipe (1
31 flexible part (10a) I (101 fathoms, (
18a) can be variable 1 rub within the telescopic range.

Although the above embodiment describes the case where the cooling fan (9), θ1) is used, natural air cooling may be used without using the cooling fan (91, (911), or a cooling source other than cooling air may be used. Even if water, oil, etc. are used, the same effect can be obtained.In addition, in the above implementation 1, the flexible part (10a)
.

[101a) and (18a) have been described in terms of a case in which they are configured with bellows, but the flexible part that can be expanded and contracted may be configured with something other than the bellows.

In addition, in the above embodiment, the hollow chamber (7) and the bearing stand (4) are
), (foundation) respectively, as mentioned above, the hollow chamber (7) and V11 are provided with bearings (31, eυ, or bearings (3), (9) and bearing stands I4), (6 ) may be provided between the

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

The present invention is directed to the above-described shaft, an annular hollow chamber formed inside the bearing and filled with a PL liquid, and a heat radiating device for radiating heat from a short distance of the bearing, respectively, and a second main shaft. A steam pipe that communicates completely with the hollow chamber of the main shaft device of the main shaft device and the heat dissipation device of the second main shaft device, and a flexible part that can be expanded and contracted.
a second steam pipe that communicates with the heat dissipation device of the main shaft device and has a flexible part that can be expanded and contracted; A second liquid pipe that communicates the heat dissipation device of the second main shaft device with the second steam pipe, the second liquid pipe and the second liquid pipe, and f! ! : By setting up a communication pipe that connects the flexible part that can be expanded and contracted, the heat in the bearing part is transported from the hollow chamber to the heat dissipation device, which quickly removes the amount of water in the bearing part and efficiently. In addition, since it can be cooled evenly, thermal deformation and distortion of the bearing portion can be suppressed to a minimum, and the machining accuracy of machine tools can be completely improved, which is extremely effective in practical terms.

[Brief explanation of the drawing]

1 and 2 are cross-sectional side views showing a conventional multi-shaft cooling device, and FIGS. 3 and 4 are block diagrams and cross-sectional side views showing a multi-shaft cooling device according to a fourteenth embodiment of the present invention. be. In the figure, +o, l+) is the second spindle device, i4), (9) is the bearing stand, (7), circle is the hollow chamber, (8
) ,, (8η is the heat dissipation device, (10i , (101
) is the second steam pipe, (10a). (l 01a) is the flexible part, 1j21. (In
It's okay. The second liquid pipe 03) is a communication pipe, and (Iga) is a flexible part. The same reference numerals in the figures indicate the same or corresponding parts. Agent Tsutomu Kuzuno - Figure 1 Figure 3

Claims (1)

[Scope of Claims] An oil pump having an annular hollow chamber formed inside the m4 receiving portion and filled with a working liquid, and a heat radiating device for radiating heat from the receiving portion. a second main shaft device, an O steam pipe that communicates the hollow chamber of the above main shaft device with a heat dissipation device of the second main shaft device and has an entire expandable and contractible flexible portion; a second steam pipe that communicates the hollow chamber with the heat dissipation device of the main shaft device of the above-mentioned OI and has a flexible portion that can be expanded and contracted; a second steam pipe that communicates the heat dissipation device of the main shaft device of the OI with the first steam pipe; a second liquid pipe that communicates between the heat dissipation device of the second main shaft device and the second steam pipe; a second liquid pipe that communicates the first liquid pipe with the second liquid pipe; A multi-axis cooling device characterized by a communicating tube having a flexible part that can be expanded and contracted. (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 stand and the bearing. (5) The multi-axis cooling device according to any one of claims 1 to 4, wherein the flexible portion is constituted by a bellows.