JPS59118346A - 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. The vapor of the vaporized Flon or the like moves to the heat radiating devices 8, 81 through the vapor pipes 10, 101 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. A part of the operating liquid passing through the liquid pipe 12 inflows into the hollow chamber 71 of the bearing stand 41 through the communicating pipe 13 while a part of the operating liquid passing through the liquid pipe 121 inflows into the hollow chamber 7 of the bearing stand 4 through the communicating pipe 131.

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 shown in FIGS. 1 and 2. In each of these figures, (1), αp is the first point of the machine tool. This is a second spindle device and is arranged at an interval of S/sONP. (2), @υ is the principal axis, (3), 0
1) is the bearing, (4), Qυ is the bearing stand, (5), (51)
is a pulley, and (6) is a bed.

Next, the operation will be explained. A driving electric motor (not shown) rotates the main shaft (2) and eυ by the rotational force transmitted to the pulley (5) and Gυ via the belt.

At this time, the main shaft (,2), (21) and the bearing stand (4),
The bearing (3), C31) located between θ◇ is connected to the main shaft (2
) and ■υ to rotate smoothly, but as the bearings (3) and <31) rotate, they generate heat due to friction and their temperature rises. The amount of heat generated in the bearing (3), C(υ) is transmitted to the bearing pedestal (4), (41), and is transferred to the bed (6) and the surrounding air, where it radiates heat.
, ■ The temperature rises, and each part undergoes various thermal deformations and changes due to thermal expansion.
Causes distortion. For this reason, the main axis (2).

■There was a drawback that the position of υ fluctuated and the machining accuracy decreased when machining the workpiece. Furthermore, there is a drawback that there is a difference in the positional fluctuations 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), (/41), (8), 6υ is a heat dissipation device, which is cooled by cooling fans (9), (9]). ing. α0゜(101) is the hollow chamber (7), (c) and the heat dissipation device (s),
t81), respectively, (1 second, (1
21) is a hollow chamber (7), (7]) and a heat dissipation device (s)
, $1), respectively.

α Pit is a first communication pipe that communicates between the liquid pipe (6) and the hollow chamber συ, and (131) is a second communication chamber that communicates between the liquid pipe (121) and the hollow chamber (7).

In addition, the hollow chambers (7), (2) and the heat dissipation device (8), Q3
υ, steam pipe θS, (101), liquid pipe α2. (1
After reducing the pressure inside 21), a predetermined amount of working liquid such as ammonia or fluorocarbon is sealed inside.

Next, the operation will be explained. The amount of heat received by the bearings <3) and eυ in the bearing stands (4) and (41) is
When the working liquid such as Freon in υ is heated and vaporized, it is taken away as vapor latent heat, and the vapor of the vaporized Freon, etc. uses its own vapor pressure to pass through the steam pipes Q (11, (101)) to the heat dissipation device. (8), move to Bl) and install the cooling fan (9)
, aυ by the surrounding air. 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 bearing (3) radiates a heat amount of 0υ to the surrounding air. The condensed working liquid is transferred to liquid pipes (6), (121
) and return to the hollow chambers (7) and (71) of the bearing stands (4) and (41) using gravity. In addition, a part of the working liquid passing through the liquid pipe (6) is transferred to the first communication pipe (via 13 to the bearing base 0).
A part of the working liquid that flows into the hollow chamber (c) and passes through the liquid pipe (121) passes through the second communication pipe (131) to the bearing stand (4).
into the hollow chamber (7). By repeating such operations, the amount of heat in the bearing stand (4), Q]) is transported to the heat dissipation device (8), el) for efficient cooling.

By the way, if the temperature rise (calorific value) of the bearing pedestal (4) is larger than that of the other bearing pedestal (41), the amount of vapor during vaporization of the working liquid in the hollow chamber (7) of the bearing pedestal (4) will decrease. The pressure and temperature are higher than the other. Therefore, more latent heat of vaporization is taken away and the bearing pedestal (4) is cooled more.
It works to suppress the temperature rise of the other bearing stand from becoming larger than that of the other bearing stand Ql). Then, the hollow chamber of the bearing stand (4) (
7) Steam with high pressure and temperature vaporized in the steam pipe 00
The working liquid that is condensed and liquefied in the heat radiating device (8) has a higher temperature than the working liquid that condenses in the heat radiating device t81), and passes through the liquid pipe θ9 to the bearing stand (4).
A part of the low-temperature working liquid that flows into the hollow chamber (7) and passes through the liquid pipe (121) passes through the second communication pipe (181) and enters the hollow chamber (7) of the bearing stand (4). Inflow, bearing stand (4
) The temperature of the working fluid in the hollow chamber (7) is lowered to reduce the temperature rise of the bearing stand (4). On the other hand, low-temperature working liquid that has been condensed and liquefied in the heat dissipation device υ flows into the hollow chamber (7) of the bearing base 0 through the liquid pipe (121), and
A part of the high-temperature working liquid passing through the liquid pipe (2) flows through the first communication pipe (13), increases the temperature of the working liquid in the hollow chamber n of the bearing pedestal (9), and increases the temperature by that amount. This increases the temperature rise of the bearing stand 0]). As a result, the bearing pedestal (4) is cooled by the lower temperature of the working fluid, reducing the temperature rise, while the bearing pedestal (!4υ) is warmed by the higher temperature of the working fluid, increasing the temperature rise, and both Bearing stand (4), (
The temperature rise of 4η can be suppressed to a small level.

By repeating these operations, if either of the two wheel cradle (rG, (4IJ) starts to increase the heat generation amount/temperature rise of one of them, the difference in temperature rise between the two bearing pedestals (4) and (41) will be reduced. It works to suppress both bearing stands (4), (41
) are effectively cooled on average. Therefore, in the machine tool, thermal deformation and distortion of the bearing portion can be minimized, and machining accuracy can be improved.

In the above embodiment, a case was described in which the cooling fan (9) and alυ were used, but natural air cooling may be used without using the cooling fan (9) and Gυ, or cooling other than cooling air may be used as the cooling source. A similar effect can be obtained using water, oil, etc.

Further, in the above embodiment, the hollow chambers (7) and (71) are the bearing stands (4).

The hollow chambers (7), (71) are connected to the bearings (3), 43]), or the bearings (3), 0υ and the bearing stand (4), Q]). It may be provided in between.

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 spindle device, first communication pipe that communicates the liquid pipe of the first spindle device with the hollow chamber of the second spindle device, the liquid pipe of the second spindle device and the first spindle device By providing a second communication pipe that communicates with the hollow chamber and transporting the heat of the bearing section from the hollow chamber to the heat dissipation device, the heat of the bearing section 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 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), 01) is the first. a second spindle device;
(41, (4υ is a bearing stand, (7), (7υ is a hollow chamber, (
8), 61) are heat dissipation devices, (+1.(19 and tll
OL), (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 - Figure 1 Figure 2 Figure 3

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 liquid pipe of the first main shaft device with the hollow chamber of the second main shaft device; a liquid 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 hollow chamber 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.