JPS59118334A - Multi-spindle cooler - Google Patents

Abstract

PURPOSE:To cool a first and a second main spindle devices effectively and evenly, by a method wherein a working liquid is led to hollow chambers of the first and the second main spindle devices by ramifying a flow of the working liquid and a calorific value of a bearing rest is transmitted to a radiator from a hollow chamber. CONSTITUTION:Calorific values of bearings 3-31, which received heat by bearing rests 4-41, are taken away as evaporation latent heat when a working liquid such as Flon in hollow chambers 7-71 is made to evaporate by heating the working liquid, and vapor such as the evaporated Flon is moved to a radiator 8 through a first and a second vapor tubes 10-101 by making use of its own vapor pressure and cooled by a cooling fan 9. The condensed working liquid is returned to the hollow chambers 7-71 of the bearing rests 4-41 through a confluent tube and a branch tube of a liquid tube 12 by making use of gravity.

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), (11)
is the first machine tool. It is the second main shaft device, and the snow dimension P
are arranged at intervals of (2), i2υ is the principal axis, (3
).

131J is the bearing, (4), II) is the bearing stand, (5)
, 61> is 2-ri, (6) is in bed.

Next, the operation will be explained. The driving electric motor (not shown) rotates the main shaft (2), e2] by the rotational force transmitted to the bobbin (5), 05υ via the belt.

At this time, the main shaft (2J, (2υ and bearing stand (4),
Bearings (3) and 1.3υ located between 14υ and 1.3υ have the purpose of helping the main shaft (2) and (2]) rotate smoothly, but as they rotate, bearings (3) and 0.
1 and 1 generate heat due to friction and the temperature rises. Bearing (3)'
, 01)K The generated heat is transmitted to the bearing pedestal (4), <41), 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 44υ rises, and various thermal deformations and distortions occur in each part due to thermal expansion.For this reason, the main shaft (2).

C2]) fluctuates, resulting in a decrease in machining accuracy when machining the workpiece. Furthermore, there is a drawback that there is a difference in the fluctuation of the positions of the main parts 11i111(2+, 2υ), and at the same time there is a difference in the machining accuracy when performing a plurality of caroes.

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 3 is a block diagram showing the functional system, and Figure 4 is a cross-sectional side view.
), C71) is an annular hollow chamber formed inside the bearing stand (4), (4υ), which is a heat dissipation device and is cooled by a cooling fan (9).ai, ( 1
01) is a hollow chamber (7), <71. 1 for guiding the vapor of the working liquid to the heat dissipation device (8), respectively.
The second steam pipe condenses and liquefies the working liquid in the heat dissipation device (8) to the bearing stand (4).

It is a plate pipe that separates and guides the flow to the hollow chamber (7), C1) of
12c).

In addition, the hollow chambers (7), (2) and the heat dissipation device (8), the first
．． After reducing the pressure inside the second steam pipe 00, (101) and the liquid pipe α, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed therein.

Next, the operation will be explained. The bearing stand (4), the bearing (3) that received heat in U, the amount of heat of +3υ is the hollow chamber (7),
(2) When heating and vaporizing the working liquid such as fluorocarbon, it is taken away as latent heat of vaporization, and the vapor such as fluorocarbon is vaporized using its own vapor pressure. Second steam pipe QO, (
101) and heat dissipation equipment +! (8) and is cooled by the surrounding air by a cooling fan (9). At this time,
Vapors such as fluorocarbons condense 7 and return to liquid, but they release latent heat of condensation to the surrounding air, and the bearing (3) radiates +3υ of heat to the surrounding air. The condensed liquid is transferred to the confluence pipe (12a) of the liquid pipe G.

Return to the bearing stand (4), (4υ hollow chamber (7), συ) via the branch pipe C121)), (12C) 1, By repeating this operation, υ, the bearing stand The amount of heat in (4) and (41) is transferred to the heat radiating device (8) for efficient cooling.

By the way, when the temperature rise (calorific value) of the bearing stand (4) becomes larger than that of the other bearing stand υ, the hollow chamber (of the bearing stand (4)
When the working liquid in 7) is vaporized, it has a larger vapor amount, vapor pressure, and vapor temperature than the working liquid in the hollow chamber l71) of the bearing stand 141). Therefore, a large amount of latent heat of vaporization is taken away by a larger amount of steam, and a larger amount of cooling is achieved, thereby suppressing the temperature rise of the bearing pedestal (4) from becoming larger υ than that of the bearing pedestal (41). Then, the steam vaporized in the hollow chamber (7) of the bearing stand (4) is transferred to the first steam pipe 0.
・It moves to a heat dissipation device (8) and is condensed and liquefied. - 10,000, the temperature rise of the bearing pedestal φυ is smaller than that of the bearing pedestal (4) V, and the working fluid in the hollow chamber (c) of the bearing 8 (4) is Compared to working liquids, the amount of vapor, vapor pressure, and vapor temperature during vaporization are lower. Therefore, bearing stand U
The low-temperature steam vaporized in the hollow chamber Vυ of υ moves to the heat dissipation device t (8) via the second steam pipe (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 and liquefied working fluid and the low-temperature condensed and liquefied working fluid are mixed to form a working fluid with an averaged temperature. The working liquid at this averaged temperature is transferred to the liquid pipe @, the confluence pipe (12a) and the branch pipe (12b).
), (12c) bearing stand (4), (
Return to the 4υ hollow chambers (7) and (2). That is, the bearing stand (4
The working fluid at a lower temperature returns to the hollow chamber (7) of ), the working fluid at a higher temperature returns, and is warmed by the increased temperature, increasing the temperature rise of the bearing pedestal υ, causing both bearing pedestals (4)
By repeating this operation, which keeps the difference in temperature rise between 2 and 3 times small, both bearing stands (4),
When the calorific value and temperature rise of (6) starts to increase, it works to suppress the difference in temperature rise between both bearing stands (4) and Ω〃, and both bearing stands (4) and (facial ) are 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 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

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

We have described the case where the hollow chambers (7), (7]) are connected to the bearings (3), 61) or the bearings (31, 3υ and the bearing stand (4), CQ). It may be provided in between.

By the way, in the above explanation, 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 bag devices, and the same effects as in the above embodiment can be obtained.

As described above, the present invention has two first and second hollow chambers 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 for dissipating the heat of the first main shaft device; ．． A liquid pipe is provided to divert and guide the working liquid that is condensed and liquefied in the second steam pipe and heat dissipation device to the hollow chamber of the first and second main shaft devices, and the heat of the bearing pedestal is transferred from the hollow chamber to the heat dissipation device. By doing so, the amount of heat from the bearing can be quickly removed and cooled efficiently and evenly, which is a practical advantage in that thermal deformation and distortion of the bearing can be minimized and the machining accuracy of machine tools can be improved. It has an extremely large effect.

[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 view showing a multi-shaft cooling device according to an embodiment of the present invention. It is. In the figure, (1) and (11) are the first. second master 1
1i111 device, (4), +4υ is bearing stand, (7)
, (711 is a hollow chamber, (8) is a heat dissipation device, head, (
101) is the first. The second steam pipe, α2, is a liquid pipe, (12a
) is a confluence pipe, (12b) and (12C) are branch pipes. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 3/

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 guides the vapor of the working liquid vaporized in the hollow chamber of the second main shaft device to the heat radiating device. A second vapor group, the working liquid that is condensed and liquefied in the heat dissipation device, is transferred to the first vapor group. A multi-shaft cooling device characterized by comprising a liquid pipe that divides and guides liquid into a hollow chamber of a second main shaft device. (2) The multi-shaft cooling device according to claim 1, wherein the hollow chamber is formed in the 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.