JPS58206362A - Multi spindle cooling device - Google Patents

Abstract

PURPOSE:To provide economic and uniform cooling of a bearing by a method wherein a steam pipe is connected to a single radiator device from each of both main shafts having a hollow chamber between a bearing with work liquid enclosed therein and a bearing block, and a liquid pipe is communicated with each of the main shafts from the radiator device. CONSTITUTION:When a bearing block 4 shows a higher increased temperature than that of another block 41, the work liquid in a hollow chamber 7 of the block 4 shows a higher amount of steam, steam pressure and temperature than those of liquid in the block 41 in case of evaporation, so that an evaporation latent heat corresponding to those values is taken to perform more cooling and the temperature of the block 4 is prevented from being increased than that of the other block. The hot steam evaporated in the hollow chamber 7 passes through a steam pipe 10 to a radiator 8, and in turn the cold steam evaporated in the hollow chamber 71 passes through a steam pipe 101 and moves to the radiator 8, then is condensed and liquefied. In the radiator 8, the hot and cold condensed and liquefied work liquids are mixed and uniformalized, returned back to the hollow chambers 7 and 71 through the liquid pipes 12 and 121, so that the increased temperature of the block 41 is decreased, the increased temperature of the block 41 is further increased and a difference in the increased temperatures is restricted low.

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, (1), CILI
are the first and second spindle devices of the machine tool, and are arranged at an interval of span P. (21, 02υ is the principal axis, (3)
.

(31) is the main shaft (2), a bearing that supports the shaft υ, (4),
←υ is the bearing (31, bearing stand that supports (31), (5)
, the dominant is the pulley, and (6) is the bed.

Next, the operation will be explained. The main shaft (2) and shaft υ are rotated by the rotational force transmitted to the pulley (5) and Ill via the V-belt by a driving electric motor (not shown).
At this time, the main shaft (2+, 较υ and bearing stand (4), @
The bearing (31, (31) located between the main shaft (2)
The purpose is to help the bearings rotate smoothly, but as they rotate, the bearings (3) and (31) generate heat due to friction and rise in temperature. The amount of heat generated in the bearings (3) and (31) is The heat is transmitted to the table (4), the circle, and is transferred to the bed (6) and the surrounding air to radiate heat.

At this time, the temperature of the bearing stand (4), ←υ increases, and various parts undergo various thermal deformations and distortions due to thermal expansion. Therefore, the main axis f2
1. If the position of @υ is fIjJJ, there is a drawback that the machining accuracy decreases when machining the workpiece.

Furthermore, there is a drawback that there is a difference in the positional fluctuations of the main axis (2) and the shaft υ, 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 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 3 is a block diagram showing the functional system, Figure 4
The figure is a cross-sectional side view. In each of these figures, (7),
The cracks are the bearings (31, (31) and the bearing stand (4).

(The annular hollow chamber (8) formed between the radiator and the radiator 411 is a heat dissipation device, and is cooled by a cooling fan (9).

cAl) and (101) are hollow chambers (7) and steam pipes (2) that guide the vapor of the working liquid that is vaporized in συ to the heat dissipation device (8), respectively.

(121) transfers the working liquid that is condensed and liquefied by the heat dissipation device (8) to the bearing stand (4), the hollow chamber (7) on the @υ side, and ff1.
These are liquid tubes that guide each of the two. In addition, hollow chamber (7)
, (lυ manufactured heat dissipation device (8) + 1□, steam pipe %, (lol), after vacuum depressurizing the inside of the liquid pipe (6), (12i), a working liquid such as ammonia or chlorofluorocarbon is placed inside it. Welfare will be included.

Next, the operation will be explained. The amount of heat of the bearing (31, (31) that received heat at Nυ is the hollow chamber (7),
When the working liquid such as fluorocarbons in ffυ is heated and vaporized, it is taken away as latent heat of vaporization, and the vapor of the vaporized fluorocarbons uses its own vapor pressure to pass through the steam pipes α(1, (101)) to the heat dissipation device. (8), and is cooled by the surrounding air by the cooling fan (9). At this time, the vapors such as fluorocarbons condense and return to liquid, but the latent heat of condensation is released to the surrounding air, and the bearings (37, ( Mitt of 3υ radiates heat to the surrounding air.

The condensed working liquid passes through the liquid pipe (2) p (121) and uses gravity to create a hollow! (7) Return to +riυ. By repeating these operations, the bearing stands (4), 11
Heat is transported from the 1O hot lid to a heat radiating device (8) for efficient cooling.

By the way, if the temperature rise (heat amount) of the bearing pedestal (4) is larger than that of the other bearing pedestal @υ, when the working liquid in the hollow chamber (7) of the bearing pedestal (4) flII vaporizes, the bearing pedestal @
Compared to the working liquid in the hollow j41υ on the υ side, the amount of vapor, vapor pressure, and vapor temperature are larger. Therefore, the amount of latent heat of evaporation is taken away to a large extent by the amount of steam that becomes larger, and the cooling is performed to a greater extent, and the temperature rise of the bearing stand (4) is suppressed from becoming larger than that of the bearing stand (4). The high-temperature steam vaporized in the hollow chamber (7) on the side (4) passes through the steam pipe system and moves to the heat sink @ (81) where it condenses and liquefies.On the other hand, the bearing stand 14υ is The temperature rise is small,
The working liquid in the hollow Nr:IIl of the bearing stand 14119JJ has a lower vapor amount, vapor pressure, and vapor temperature when vaporized than the working liquid in the hollow chamber (7) on the bearing stand (4) side. Therefore,
The steam at the bottom of 7' cOA vaporized in the hollow chamber συ on the side of the bearing stand i4υ moves 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), high temperature condensed and liquefied working liquid and low temperature condensed The liquefied working fluid mixes to form an averaged temperature body. The working liquid at this averaged temperature is in the liquid pipe g2. (1
2t) respectively) bearing pedestal (4), i4υ side hollow chamber (7), (return to 711. That is, bearing pedestal (4)
The working fluid at a lower temperature returns to the hollow chamber (7) on the side, and is cooled by the lower temperature, reducing the temperature rise of the bearing pedestal (4) and lowering the temperature of the hollow chamber of the bearing pedestal @υ-1. The working fluid, which has now reached a temperature of
The difference in temperature rise of f4υ can be kept small.

By performing nine turns without such an operation, the difference in temperature rise between both bearing stands (4), 141) can be suppressed to a small level, and both bearing stands (4), @υ can be effectively cooled on the average. Therefore, in machine tools, thermal deformation and
Distortion can be minimized and processing accuracy can be improved.

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

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 and second bearings each having an annular hollow chamber formed between the bearing and the bearing pedestal and filled with a working fluid. The second spindle device, this first spindle device. a heat radiating device for radiating heat from the hot bolt of the second spindle device; A steam pipe guides the vapor of the working liquid that is vaporized in the hollow chamber of the main shaft device of jg2 to the heat radiating device, and guides the working liquid that is condensed and liquefied in the heat radiating device to the hollow chambers of the first and second main shaft devices, respectively. By providing a liquid pipe and transporting the heat of the bearing pedestal from the hollow chamber to the heat dissipation device, the heat of the bearing pedestal can be quickly removed and cooled efficiently and evenly, thereby preventing thermal deformation of the bearing part. It has an extremely large effect on the industrial use, as it can suppress distortion to a minimum and improve the machining accuracy of machine tools, etc.

[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) I Qll is the first. Second main shaft device, (3), (31) are bearings, (4), @phantom is bearing stand, (7), (711 is hollow chamber, (8) is heat dissipation device, (101) is steam Pipe No. 4 (1gl) is a liquid pipe. In addition, the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] The first and second sections are formed between a bearing that supports the main shaft and a bearing stand that supports this bearing, and each have an annular hollow chamber in which a working fluid is sealed. a second spindle device, the first spindle device; A heat dissipation device for dissipating the amount of heat of the second spindle device; A steam pipe guides the working liquid vaporized in the hollow chamber of the second spindle device to the heat radiating device, and the working liquid liquefied vertically in the heat radiating device is transferred to the above +! [l! 1st. A multi-shaft cooling device characterized in that it is equipped with a liquid pipe that guides a central shaft of a second main shaft device.