JPS58206361A - Multi spindle cooling device - Google Patents

Abstract

PURPOSE:To provide economic and uniform cooling of a main shaft device by a method wherein a steam pipe is connected to a single radiator from each of both main shafts having a hollow chamber with work liquid enclosed in a bearing and a liquid pipe is communicated with each of the main shafts from a radiator. CONSTITUTION:When a bearing 3 shows an increased temperature higher than that of another bearing 31, the work liquid in a hollow chamber 7 of the bearing 3 shows a higher amount of steam, steam pressure and temperature than those of another bearing in case of evaporation, so that an evaporation latent heat corresponding to the values is taken to perform more cooling and the temperature of the bearing 3 is prevented from being increased than that of the bearing 31. The hot steam evaporated in the hollow chamber 7 passes through a steam pipe 10 and a cold steam evaporated in the hollow chamber 71 passes through a steam pipe 101 and each of them moves to a radiator 8, condensed and liquefied there. The hot and cold condensed liquids are mixed in the radiator 8 and a liquid of uniformalized temperature is returned to the hollow chambers 7 and 71 through liquid pipes 12 and 121, so that a difference in increased temperatures between both bearings 3 and 31 is restricted low.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-shaft cooling device for cooling bearings such as a plurality of main shafts of a machine tool.

Conventionally, this loincloth device has been shown in FIGS. 1 and 2. In each of these figures, (11 and h are the first and second spindle devices of the machine tool, which are arranged at an interval of span P. (2+, all are the main spindles, (31° @
υ is the main shaft + 21 e The bearing that supports the body υ, (4),
141) is the bearing stand, (5) #II is the pulley, (6
) is a bed.

Next, the operation will be explained. The main shaft (21#02υ) is rotated by the rotational force transmitted to the goo IJ (6) and 11 by a driving electric motor (not shown) via the V-belt.

At this time, the bearing (3) #h located between the main shaft (21) and the bearing stand (4) @υ has the purpose of helping the main shaft (2), υ, rotate smoothly. As it rotates, the bearing (piece, @phantom) generates heat due to friction and its temperature rises.The amount of heat generated in the bearing (31, Iυ) is
The heat is transferred to the bed (6) and the surrounding air to radiate heat. At this time, the temperature of the bearing stand (4) and f41 rises, and various thermal deformations and strains occur in each part due to thermal expansion. For this reason, the main axis (2).

This method has the drawback that the position of the shaft υ fluctuates, reducing machining accuracy when machining the workpiece. Furthermore, there is often a problem that there is a difference in the fluctuation of the position of the main axis (21*n υ) between the two, and at the same time, there is a difference in the machining precision when performing a plurality of machining operations.

This invention eliminates the drawbacks of the prior art as mentioned above.

The object of the present invention is to provide a multi-shaft cooling device that can effectively and evenly cool the first and second main shaft devices.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Figure 3 is a block diagram showing the functional system, Figure 4
The figures are cross-sectional side views, and in each of these figures, (7),
συ is a bearing (3), an annular hollow chamber formed inside the rice cake, (8) is a heat dissipation device, which is cooled by a cooling fan (9). α(), (101) are hollow chambers. (7),
The vapor of the working liquid that is vaporized at σ0 is transferred to a heat dissipation device (8
), Q2. (121) is a heat dissipation device (8
) The working liquid is condensed and liquefied in the hollow chamber (7) of the bearing L3), (31).

This is a liquid pipe that guides each of the holes. In addition, hollow chamber (7)
.

σ0 and heat sink [(83, steam pipe σo, (1o1)
, liquid tube (6).

After the inside of (121) is vacuum depressurized, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is withdrawn therein.

Next, we will explain the operation.The amount of heat in the bearings (31, (31)) is taken away as latent heat of evaporation when the working liquid such as fluorocarbons in the hollow chamber (7) and ffυ is heated and vaporized, Steam moves to the heat radiator (8) through the steam pipe (101) using its own steam pressure, and 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 heat of the bearing (3)l (3x) is radiated to the surrounding air. The condensed working fluid is in the liquid pipe (b).

(121) and bearing (31, (3m)) using gravity.
Hollow chamber (7), return to ff1l. By reversing without such a movement, the bearing (3)t (31)
The amount of heat is transported to the heat radiating device (8) for efficient cooling.

By the way, when the temperature rise (heat it) of the bearing (3) becomes larger than that of the other bearing (31), the hollow chamber (
7) When the working liquid in the bearing (31) is vaporized,
The amount of vapor, vapor pressure, and vapor temperature are larger than that of the working liquid in Vυ. Therefore, the amount of latent heat of vaporization is greatly absorbed by the amount of steam, and the bearing (3) is cooled to a greater extent.
The temperature rise of the bearing (31) is suppressed from becoming larger than that of the bearing (31). The high temperature steam vaporized in the hollow chamber (7) of the bearing (3) passes through the steam pipe αQ to the heat dissipation device (
8) to condense and liquefy. On the other hand, the temperature rise of the bearing (cIl) is smaller than that of the bearing (3), and the working liquid in the hollow chamber νυ of the bearing (31) is vaporized compared to the working liquid in the hollow chamber (7) of the bearing (3). The steam amount, steam pressure, and steam temperature are low. Therefore, the low-temperature steam vaporized in the hollow chamber υ of the bearing (31) passes through the steam pipe (101) to the heat dissipation device (
8) to condense and liquefy. 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), high temperature condensed and liquefied working liquid and low temperature condensed The liquefied working liquid is mixed to form a working liquid with an average temperature. The working liquid at this averaged temperature is in the liquid pipe (6),
(121) returns the hollow chamber (7) #vυ of the bearings (31, (31), respectively. In other words, the working fluid at a lower temperature returns to the hollow chamber (7) of the bearing (3), and the lower temperature The temperature increase in the bearing (3) is reduced by that amount, and the working fluid at a higher temperature is returned to 41υ inside the bearing (31).
) increases, and the difference in temperature rise between both bearings (3) and (at) is kept small. By repeating these operations, the difference in temperature rise between the two bearings (31, (31) can be suppressed to a small level, and the temperature difference between the two bearings (3), (31) can be kept small.
31) is effectively cooled on the average. Therefore, in a machine tool, thermal deformation and distortion of the bearing portion can be minimized, and machining accuracy can be improved.

In the above embodiment, nine cases were described using the cooling fan (9), but natural air cooling may be used without using the cooling fan (9), or cooling water or oil other than cooling air may be used as the cooling source. A similar effect can be obtained by using .

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 Kamikiryo embodiment can be achieved.

This invention provides the first and second bearings each having an annular hollow chamber formed inside the bearing and in which a working fluid is sealed. a second main shaft device, a heat radiator that radiates the heat of the first and second main shaft devices, and a steam pipe that guides the vapor of the working liquid vaporized in the hollow chamber of the first and second main shaft devices to the heat radiator, respectively. , the working liquid to be condensed and liquefied in the heat dissipation device is first. Second
By installing liquid pipes that guide each of the bearings into the hollow chambers of the main shaft device, and by transporting the heat of the bearings from the hollow chambers to the heat dissipation device, the heat of the bearings is rapidly removed and cooled efficiently and evenly. As a result, thermal deformation and distortion of the bearing part can be minimized and the machining accuracy of machine tools can be improved, which is extremely effective in practical terms.

[Brief explanation of drawings]

1 and 2 are cross-sectional side views showing a conventional multi-shaft cooling device, and FIGS. 3 and 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. In the figure, (1) e ('II is the first and second spindle device, (31, (31) are the bearings, (7), ffυ are the hollow chambers, (8) are the heat dissipation device, (11), ( 101) is a steam pipe, and nt (121) is a liquid pipe. In addition, the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kazuno - Figure 1 Figure 2 Figure 13 Figure 4

Claims (1)

[Claims] First and second main shaft devices each having an annular hollow chamber formed inside a bearing that supports the main shaft and in which a working liquid is sealed; A heat dissipation device for dissipating the amount of heat of the second spindle device; A steam pipe 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 a working liquid that is condensed and liquefied in the heat radiating device is guided to the first. A multi-shaft cooling device characterized by comprising liquid pipes each guided into a hollow chamber of a second main shaft device.