JPS59118330A - Multi-spindle cooler - Google Patents

Abstract

PURPOSE:To cool a main spindle device effectively and evenly, by a method wherein a working liquid is passed through a vapor tube, a liquid tube and a connecting tube having flexible parts, and a calorific value of a bearing part is trnasmitted 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. Vapor such as the evaporated Flon is moved to a radiator 8 through vapor tubes 10-101 having flexible parts 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 liquid tubes 12-121 having flexible parts. The liquid tubes 12-121 having flexible parts are connected through connecting tube 13 with each other.

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, ill, (1υ are the first and second spindle devices of the machine tool, which are arranged at an interval of span P. 12+, +211 are the main spindles, (3), (
3D is the bearing, +41, (4υ is the bearing stand, +51.
(51) is a pulley, and (6) is a bed.

Next, the operation will be explained. The main shaft +21. (Rotate 2υ. At this time, main shaft +21. (211 and bearing stand +41,
(41) bearing t31. (3υ is principal axis +
The purpose is to help the bearings 2+1211 rotate smoothly, but as they rotate, the bearings 31 and 311 generate heat due to friction and rise in temperature.

Bearing +31. (The amount of heat generated at 13υ is the bearing stand + 41,
(41), the heat is transferred to the bed (6) and the surrounding air, and is radiated.

At this time, the temperature of the bearing stand (4+, (4υ) increases, and each part undergoes various thermal deformations and strains due to thermal expansion. As a result, the position of the main shaft +211211 changes, and when machining the workpiece, There was a drawback that the machining accuracy decreased.Furthermore, there was a drawback that there was a difference in the fluctuation of the position of the spindle !21. was there.

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, Figure 4
The figures are cross-sectional side views, and in each of these figures, t71.
(71) is bearing stand +41. The annular hollow chamber formed inside (41), (8) is a heat dissipation device, and is cooled by a cooling fan (91. (lω, (101)
guide the vapor of the working liquid vaporized in the hollow chamber +7+, (71) to the heat dissipation device (8), respectively, and extendable and contractible flexible parts (10a), such as bellows, etc.
101a) Steam pipe with wo, (12), (121)
The working fluid that is condensed and liquefied in the heat dissipation device (8) is transferred to the bearing stand +4.
1i4υ hollow chamber +71. (71), and has flexible parts (12a) and (121a) that can be expanded and contracted, such as bellows. (13) is the first liquid pipe (17J) and the second liquid pipe (17J).
21) and has a flexible part (13a) such as a bellows that can be expanded and contracted.

In addition, the hollow chamber t71. (71) and a heat dissipation device (8),
1st° 2nd steam pipe (fil, (101), 1st.
Second liquid tube circle.

After the internal pressure of (121) is completely reduced to vacuum, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed inside.

Next, the operation will be explained. Bearing stand +41. (The amount of heat of the bearing f31.c3υ that received heat at 4υ is the hollow chamber + 71.
71) When heating and vaporizing the working liquid such as fluorocarbon in the 1. second steam pipe uo
1. (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 the latent heat of condensation is released to the surrounding air. Bearing f31. (Radiates heat of 3υ to the surrounding air. The condensed working liquid passes through the 1st 2nd liquid pipe ←L (121) and uses gravity to the bearing base + 4 + 1
Return to the 4υ hollow chamber (71, (71). By repeating this operation, the heat of the bearing stand + 4υ is transported to the heat dissipation device (8) for efficient cooling. .

By the way, when the temperature rise (calorific value) of the bearing pedestal (4) becomes larger than that of the other bearing pedestal (4υ), the working liquid in the hollow chamber (7) of the bearing pedestal (4) vaporizes and the temperature of the bearing pedestal (4υ) increases. The amount of vapor, vapor pressure, and vapor temperature are larger than that of the working liquid in the hollow chamber (71).Therefore, the larger amount of vapor absorbs a large amount of latent heat of vaporization, and cools the bearing pedestal (4). It works to suppress the temperature rise of the bearing pedestal (4υ) from becoming larger than the temperature rise of the bearing pedestal (4).
7) The high temperature steam vaporized in the first steam pipe α0
) to the heat dissipation device (8) where it is condensed and liquefied. On the other hand, the temperature rise of the bearing stand (4υ) is smaller than that of the bearing stand (4), and the working liquid in the hollow chamber (71) of the bearing stand (4υ) is transferred to the working liquid in the hollow chamber (7) of the bearing stand (4). The amount, pressure, and temperature of steam during vaporization are lower than that.Therefore, the bearing stand (4
The low-temperature steam vaporized in the hollow chamber (71) of 1) moves to the heat dissipation device (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 liquefied working liquid and the low temperature condensed liquefied working liquid are mixed 17 to form a working liquid having an average temperature. The working liquid at this averaged temperature is transferred to the bearing pedestal (4) through the first and second liquid pipes (121, (121), respectively).

(4υ hollow chamber t7+, returns to (71). In other words, the lower temperature working fluid returns to the hollow chamber (7) of the bearing pedestal (4), is cooled by the lowered temperature, and is cooled to the bearing pedestal +41.
The temperature rise in the hollow chamber (71) of the bearing stand +41) is reduced.
The difference in temperature rise between F41 and (41), which increases with F41, can be suppressed to a small value. As this operation is repeated, the amount of working fluid in the hollow chamber (7) on the bearing pedestal (4) side gradually decreases (as the amount of working fluid in the hollow chamber (71) on the bearing pedestal (41) side gradually decreases). Although the amount is large, the heat dissipation device (8
) can return part of the working fluid that returns into the hollow chamber (71) on the bearing stand (4υ side) to the hollow chamber (7) on the bearing stand (4) side, making the amounts of both working liquids a predetermined amount. By repeating this operation, if the heat generation amount and temperature rise of either of the bearing stands +41i4υ begins to increase, the difference in temperature rise of both bearing stands +41.(4υ) will be kept small. As a result, both bearing stands +41. Also, the span P between the main shaft (2) and the main shaft port can be set to 0.01.
(101) flexible part (10a), (101a
), 1st. It can be made variable within the expansion and contraction range of the flexible parts (12a), (121a) of the second liquid pipes (1), (121) and the flexible parts (1, 3a) of the communication pipe (13).

Although the above embodiment describes the case where the cooling fan t9+ is used, natural air cooling may be used without using the cooling fan (9), or cooling water, oil, etc. other than the cooling air may be used as the cooling source. A similar effect can be obtained.

Further, in the above embodiment, the hollow chamber +71. (71) is the bearing stand +41. (Did we mention the case where each of the hollow chambers (71, (71) are provided in the bearing t31.131)?
) or bearing (3), 6υ and bearing stand +41. Although the above explanation deals with the case where there are two spindle devices, the present invention can also be applied to the case where there are three or more spindle devices. The same effects as in the above embodiment are achieved.

As described above, this invention provides first and second shafts each having an annular hollow chamber formed inside the bearing portion and filled with a working fluid. a second main shaft device, a heat radiating device that radiates heat from the first and second main shaft devices, a heat radiating device that guides the vapor of the working liquid vaporized in the hollow chambers of the first and second main shaft devices to the heat radiating device, and expands and contracts. The first with a possible flexible part. The working liquid that is condensed and liquefied in the second steam pipe and the heat dissipation device is transferred to the first steam pipe.
The first spindle has flexible parts that are respectively guided into the hollow chambers of the second spindle device and are extendable and retractable. second liquid pipe, first
By providing a communication pipe that communicates the liquid pipe with the second liquid pipe and has a flexible part that can be expanded and contracted, the amount of heat in the bearing part is transported from the hollow chamber to the heat radiating device, thereby reducing the amount of heat in the bearing part. Since it can be quickly, efficiently, and evenly cooled, 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 cross-sectional side view showing a multi-shaft cooling device according to an embodiment of the present invention. It is. In the figure, txt, (tυ are the first and second spindle devices,
+41, (41) is the bearing stand, (71, (71) is the hollow chamber, +81 is the heat dissipation device, [101, (101) is the first
．． Second steam pipe, (10a). (101a) is a flexible part, (1), (121
) is the first. Second liquid pipe, (12a), (121a
) is a flexible part, ``bet'' is a communicating pipe, and (13a) is a flexible part. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3

Claims (1)

Scope of Claims: (1) First and second parts each having an annular hollow chamber formed inside the bearing part and filled with a working liquid. 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 has a flexible portion that guides the vapor of the working liquid vaporized in the hollow chamber of the second main shaft device to the heat radiating device, and has an expandable and contractible flexible portion. A second steam pipe transfers the working liquid to be condensed and liquefied in the heat dissipation device to the first steam pipe. The first spindle has flexible parts that are respectively guided into the hollow chambers of the second spindle device and are extendable and retractable. A multi-axis cooling device comprising a second liquid pipe, a communication pipe that communicates the first liquid pipe and the second liquid pipe and has a flexible part that can be expanded and contracted. (21) The multi-shaft cooling device according to claim 1, characterized in that the hollow chamber is formed in a bearing stand. (3) Claim, characterized in that the hollow chamber is formed in a bearing The multi-shaft cooling device according to claim 1. (4) The multi-shaft cooling device according to claim 1, characterized in that the hollow chamber is formed between the bearing and the bearing stand. (5) Flexible 5. The multi-axis cooling device according to claim 4, wherein the portion is constituted by a bellows.