JPS59118344A - Multi-spindle cooling device - Google Patents

Abstract

PURPOSE:To cool main spindle devices effectively and evenly by a method wherein operating liquid is flowed through vapor pipes, liquid pipes and communicating pipes 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 vapor pipes 10, 101 by utilizing the vapor pressure of itself and is cooled by cooling fans 9, 91. The condensed operating liquid returns into the hollow chambers 7, 71 of the bearing stands 4, 41 through the liquid pipes 12, 121 by utilizing the gravity thereof. A part of the vapor of the operating liquid passing through the vapor pipe 10 inflows into the heat radiating device 81 through the first communicating pipe 13 while the condensed and liquified operating liquid inflows into the hollow chamber 71 of the bearing stand 41 through the liquid pipe 121. On the other hand, a part of the vapor of the operating liquid passing through the vapor pipe 101 inflows into the hollow chamber 7 of the bearing stand 4 through the second communicating pipe 131, the heat radiating device 8 and the liquid pipe 12.

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) and (0) are the first parts of the machine tool. This is a second spindle device and is arranged at intervals of S/f P. (2), C? ]) is the main axis, (3),
0]) is the bearing, (4), C4υ is the bearing stand, (5), (5
Wa is the pulley and (6) is the bed.

Next, the operation will be explained. The main shaft (2), ■υ is rotated by the rotational force transmitted to the pulley (5), (!5υ) via a V-belt by a driving electric motor (not shown).

At this time, the bearing (3), eυ located between the main shaft (2), ■υ and the bearing stand (4), Ql) is the main shaft (2), 121).
The purpose is to help the bearings (3), 01) rotate smoothly, but as they rotate, the bearings (3), 01) generate heat due to friction and their temperature rises. The amount of heat generated in the bearing (3), 0υ is transferred to the bearing stand (4
), Gl]), and is transferred to the bed (6) and the surrounding air to radiate heat. At this time, the temperature of the bearing stand (4), Ql) increases, and various parts undergo various thermal deformations and strains due to thermal expansion. For this reason, the main axis (2).

There was a drawback that the position of Qυ fluctuated and the machining accuracy decreased when machining the workpiece. Furthermore, there is a drawback that there is a difference in the fluctuation of the position of the main axis (2) and @υ between them, and at the same time, there is a difference in the machining accuracy when performing a plurality of machining operations.

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 8 is a block diagram showing the functional system.
The figures are cross-sectional side views, and in each of these figures, (7),
(7]) is an annular hollow chamber formed inside the bearing stand (4), (8), 6υ is a heat dissipation device, and a cooling fan (
9J, 91). QC), (101
) are the steam pipes that communicate the hollow chambers (7), (c) with the heat radiating device (8) and eυ, respectively, (6), (121) are the hollow chambers (7), (c) with the heat radiating device (8), These are liquid pipes that communicate with f8υ. α■ is steam pipe αO and heat dissipation device 6]
), the first communication pipe (181) communicates with the steam pipe (1
01) and the heat dissipation device (8).

In addition, the hollow chambers (7), (71) and the heat dissipation device (8), G
31), Steam pipe GO, (101), Liquid pipe (2), (
121), a predetermined amount of a working liquid such as ammonia or chlorofluorocarbon is sealed therein.

Next, the operation will be explained. The heat of the bearing (3) and 0η received by the bearing stand (4) and Qυ is taken away as vapor latent heat when the working liquid such as fluorocarbon in the hollow chamber (7) and (2) is heated and vaporized. Steam such as fluorocarbons passes through the steam pipe (QO, Dot) using its own steam pressure and is sent to the heat dissipation device (8).
) and is cooled by the surrounding air by cooling fans (9), 91). At this time, the vapor of fluorocarbon or the like condenses and returns to liquid, but releases the latent heat of condensation to the surrounding air, and the amount of heat from the bearings (3, 01) is radiated to the surrounding air. The condensed working liquid passes through the liquid pipes (2) and (121), and uses gravity to flow into the hollow chamber (7) of the bearing stand (4) and G11.
Return to n. Further, a part of the vapor of the working liquid passing through the steam pipe α0 flows into the heat dissipation device 6 through the first communication pipe α■,
The working liquid condensed and liquefied in the heat dissipation device 6υ is transferred to the liquid pipe (12
1) and flows into the hollow chamber (7]) of the bearing stand (4]). On the other hand, a part of the vapor of the working liquid passing through the steam pipe (101) flows into the heat radiating device (8) via the second communicating pipe (181), and the working liquid condensed and liquefied in the heat radiating device (8) is liquefied. It flows into the hollow chamber (7) of the bearing base (4) through the pipe α. By repeating this operation, the bearing stand (4
), Ql) is transferred to the heat dissipation device (8) and etυ 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 θυ, the hollow chamber (of the bearing stand (4)
7) The amount of vapor, pressure, and temperature during vaporization of the working liquid in the above are larger than those in the other. Therefore, a larger amount of latent heat of vaporization is absorbed and the bearing pedestal (4) is cooled to a greater extent, and the first Steam with higher pressure and temperature flows in through the communication pipe α1. As a result, when viewed from the bearing stand (4) side, the heat radiation area increases by the amount that flows into the other heat radiation device 6) via the first communication pipe a3, and the cooling capacity increases. In addition, in the heat dissipation device f3η, high temperature steam flowing from the hollow chamber (7) of the bearing stand (4) flows into the bearing stand 0υ.
The hollow chamber (7υ) mixes with the low-temperature steam that flows in,
As a result, the temperature of the steam flowing into the hollow chamber (c) of the bearing stand 0υ becomes higher. Therefore, the temperature of the working fluid condensed and liquefied in the heat dissipation device O1l]) also increases, and the temperature rise of the bearing stand Ql) increases by the increased temperature. On the other hand, low-temperature steam flows not only into the heat radiating device 6υ but also into the other heat radiating device (8) from the hollow chamber (c) of the bearing stand o]) through the second communication pipe (181), and the steam flows into the heat radiating device ( In step 8), it mixes with the high-temperature steam that has flowed in from the hollow chamber (7) of the bearing pedestal (4), and as a result, the temperature of the steam that has flowed in from the hollow chamber (7) of the bearing pedestal (4) becomes lower. Therefore, the temperature of the working liquid condensed and liquefied in the heat dissipation device (8) is also lowered, and the temperature rise of the bearing stand (4) is reduced by the lowered temperature.

By repeating these operations, if the heat generation amount or temperature rise of either the bearing stands (4) or (6) begins to increase, the difference in temperature rise between the bearing stands (4) and (6) will be reduced. It works to suppress the cooling, and both bearing stands (4), Ql) are effectively cooled evenly. 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 addition, although the above embodiment describes the case where the cooling fan (9), aυ is used, natural air cooling may be used without using the cooling fan (9), 0), or cooling air may be used as the cooling source. Similar effects can be obtained by using other cooling water, oil, etc.

In addition, in the above embodiment, the hollow chambers (7) and (c) are
4).

01), but the hollow chambers (7) and (71) can be used as bearings (3), 0υ, or bearings (3), 01) and bearing stands (4)', (9). It may be provided between the two.

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.

As explained above, the present invention includes an annular hollow chamber formed inside the bearing portion and filled with a working liquid, and a heat dissipation device communicated with the hollow chamber through piping constituted by a steam pipe and a liquid pipe. 1゜Second main shaft device, first communication pipe that communicates the steam pipe of the first main shaft device and the heat dissipation device of the second main shaft device, the steam pipe of the second main shaft device and the first main shaft device By providing a second communication pipe that communicates with the heat dissipation device and transporting the heat of the bearing from the hollow chamber to the heat dissipation device, the heat of the bearing is quickly removed and cooled efficiently and evenly. As a result, thermal deformation and distortion of the bearing portion can be minimized 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 cross-sectional side views showing a conventional multi-shaft cooling device, and FIGS. 8 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), Qυ is the first. Second spindle device, (
4), Qυ is the bearing stand, (7), (7]) is the hollow chamber, (8
), @]) is a heat dissipation device, 00. (6) and (10
1), (121) is piping, α■. (181) is the first. This is the second communication pipe. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - No. 114 Figure 2 Figure 3 1

Claims (4)

[Claims] (1) A first component having an annular hollow chamber formed inside the bearing portion and filled with a working liquid, and a heat dissipation device communicated with the hollow chamber through piping constituted by a steam pipe and a liquid pipe. a second main shaft device; a first communication pipe that communicates the steam pipe of the first main shaft device with the heat dissipation device of the second main shaft device; a steam pipe of the second main shaft device and the first main shaft; A multi-axis cooling device characterized by comprising a second communication pipe that communicates with a heat dissipation device of the device. (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.