JPS58206351A - Multiple spindle cooling device - Google Patents

Abstract

PURPOSE:To provide a variable relation between the diameters of shafts, and cooling and uniformalized quantity of liquid by a method wherein liquid pipes of both main shafts connecting a hollow chamber to a radiater chamber between a bearing and a bearing block through a liquid pipe and a steam pipe are connected together and either the steam or liquid pipe is communicated with another radiater by a flexible pipe. CONSTITUTION:When a bearing block 4 shows a higher increased temperature than that of another block 41, an amount of vapour, steam pressure, and temperature show higher values than those of another block under evaporation of work liquid in a hollow chamber 7 at the block 4, so that a higher evaporating latent heat is taken to provide more cooling and the temperature of the block 4 is prevented from being increased more than that of the other block. Then, the hot steam evaporated in the hollow chamber 7 passes through a steam pipe 10, moves to a radiater 81. The liquid condensed there shows a higher temperature than that of the liquid in the device 8, passes through a liquid pipe 121 and flows into the hollow chamber 71, so that the temperature of the block 41 is increased and a difference in increased temperatures between both bearing blocks is restricted low. Although the amount of liquid in the hollow chamber 71 is increased under repetition of this operation, a part of the liquid is returned back to the hollow chamber 7 through a communication pipe 13 and then unformalized. A span can be made variable in a range of expansion and contraction of flexible pipes 10a, 101a and 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-shaft cooling device for cooling the bearings of, for example, a plurality of main spindles of a machine tool, and particularly to a multi-shaft cooling device number having a structure in which the mutual positional relationship of a plurality of main spindles is variable. This is related to this.

Conventionally, there have been devices of this type that are not shown in FIGS. 1 and 2. In each of these figures, (1), αυ is the first . This is a second main shaft device, and is arranged and adjusted at intervals of an arbitrary span P by a movement adjustment device (not shown). +
21, (21) C main axis, +31, (31)
C main axis +21. (Bearing supporting 211, +41,
(41) is bearing f31. (31) Bearing stand supporting the +
51, (51) is Puri, (June, bed).

Next, the operation will be explained. The rotational force transmitted to the pulley +5+ (51) by a driving electric motor (not shown) via the V-belt causes the main shaft +21. c? 1) Rotate. At this time, the main shaft +2+12υ and the bearing stand 141, (4
The purpose of the bearing 131, (31) located between the main shaft 12+, (21) is to help the main shaft 12+, (21) rotate smoothly. (31) generates heat due to friction and its temperature rises. Bearing (: pull, (31
) is the amount of heat generated in the bearing stand +41. (41), and is transferred to the bed [61 and the surrounding air to radiate heat. At this time, the heat is transferred to the bearing stand +41. (41) increases in temperature, and various parts undergo various thermal deformations and strains due to thermal expansion. Therefore, the main axis +21
．． cl! There was a drawback in that the position of 11 fluctuated and the machining accuracy decreased when machining the workpiece. Further, there is a drawback that there is a difference in the fluctuation of the positions of the main axes +21 and +211 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 3 is a block diagram showing the functional system, Figure 4
The figures are cross-sectional side views, and in these figures, f7+,
(71) is a bearing (31, (31) and a bearing stand (41, (
41), an annular hollow chamber formed between 18+, ('
81) is a heat dissipation device, cooling fan +9+, (91
). H, (101) is a hollow chamber (7
1, (71) and the heat dissipation device (81), +s+, respectively, and includes an expandable and contractible flexible part (IQa), such as a bellows (101a).
have. Q3, (121) is a hollow chamber +71.
(71), the heat dissipation device +8+, and (sl), each having a portion (13a) that communicates with the communication pipe. Furthermore, the hollow chamber (
71, (71) and heat dissipation device +81. (81), steam pipe Gα, (101), liquid pipe (121, after vacuum depressurizing the inside of (121), ammonia.

A predetermined amount of working fluid such as fluorocarbon is sealed inside.

Next, the operation will be explained. Bearing stand +41. (41)
The amount of heat received by the bearing (31, (31) in the hollow chamber 17+
, When the working liquid such as fluorocarbons in (71) is heated and vaporized, it is taken away as latent heat of vaporization, and the vaporized fluorocarbons etc. utilize their own vapor pressure to pass through the steam pipe Ql to the heat dissipation device (81). to the heat dissipation device (8) via the steam pipe (101)
and are cooled by the surrounding air by the cooling fan +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 of the bearing +:n, (31) is radiated to the surrounding air. The condensed working liquid passes through the liquid pipe H, (121) and returns to the hollow chamber m, (71) using gravity. By repeating this operation, the bearing stand +41. (
41) is transported to the heat dissipation device (81), +131 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 when the working liquid in the hollow chamber (7) on the bearing pedestal (4) side is vaporized will decrease.・The steam pressure and steam temperature are higher than the other. Therefore, a larger amount of latent heat of vaporization is absorbed, the bearing pedestal (4) is further cooled, and the temperature rise of the bearing pedestal (4) is suppressed from becoming larger than that of the other bearing pedestal (41). Then, the bearing stand (4 (
The high-temperature steam vaporized in the side hollow chamber (7) moves to the heat radiating device (81) through the steam pipe concave, and then moves to the heat radiating device (81).
The working liquid condensed at ) has a higher temperature than the working liquid condensed at the heat dissipation device (8), and flows into the hollow chamber (71) on the bearing stand (41) side via the liquid pipe (121). Therefore, in the bearing pedestal (41), the working fluid is warmed by the higher temperature, increasing the temperature rise, and both bearing pedestals +41. (41)
The difference in temperature rise can be kept small. In addition, the bearing stand (41
) has a smaller temperature rise than bearing stand (4);
The working liquid in the hollow chamber (71) on the side 1) 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 (41 side). (101)
, heat dissipation device 181. Lower temperature working liquid flows in through the liquid pipe @. As a result, the bearing stand (4) is cooled by the lower temperature of the working fluid, reducing the temperature rise.
Double bearing stand 141. The temperature rise difference in (41) can be kept small. As this operation is repeated, the amount of working fluid in the hollow chamber (7) on the bearing pedestal (4) side gradually decreases, and the amount of working fluid in the hollow ii1 (71) on the bearing pedestal (41) side gradually decreases. However, the communication pipe (13) increases the heat dissipation device (
A part of the working liquid that returns from the hollow chamber (71) on the bearing stand (41) side from 81) can be returned to the hollow chamber (7) on the bearing stand (4) side. I am working as a guard to ensure that. By repeating such an operation, if the heating cover/temperature of either of the bearing pedestals 141 (41) begins to increase, the temperature of both bearing pedestals +41. (
41) works to keep the difference in temperature rise small, and both bearing stands + 41. (41) is 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 addition, the span P between the main shaft (2) and the main shaft (21) is
), CIota) and the flexible portion (13a) of the communication pipe O-ken.

In the above embodiment, the case where the cooling fan +9+ (91) was used was described, but the cooling fan +91. (9
A similar effect can be obtained by performing natural air cooling without using 1), or by using cooling water, oil, etc. other than cooling air as a cooling source.

Moreover, in the above embodiment, the flexible part (10a).

Although a case has been described in which the (101a) row I and (13a) are constructed of bellows, the flexible portion that can be expanded and contracted may be constructed of a material other than the bellows.

In addition, in the above embodiment, the case was described in which the steam pipe (1 (1, (101)) was connected to the other heat radiating device (81), +s+, but in contrast to this, the liquid pipe (IL (121) The heat dissipation devices (81) and 181 may be connected to each other, and the liquid pipes (121, (121) may be provided with expandable and contractible flexible parts, and the liquid pipes H, (121) may be communicated with each other through the communication pipe (13). The same effects as in the example can be expected.

As explained above, this invention includes an annular hollow chamber formed between a bearing and a bearing pedestal and filled with a working liquid, and a heat dissipation device that communicates with the hollow chamber through piping composed of a steam pipe and a liquid pipe. and the first . a second spindle device;
A communication pipe is provided which communicates the liquid pipe of the first main spindle device with the liquid pipe of the second main spindle device and has a flexible part that can be expanded and contracted. Either one of the pipes is connected to the other heat radiating device, and either the steam pipe or the liquid pipe is provided with an expandable and contractible flexible part so that the heat of the bearing stand is transported from the hollow chamber to the heat radiating device. This makes it possible to quickly remove heat from the bearing stand and cool it efficiently and evenly, which has an extremely large practical effect of minimizing thermal deformation and distortion of the bearing and improving the machining accuracy of machine tools, etc. .

[Brief explanation of the drawing]

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, 111. (11) is the first. second spindle device, +31. (31) is a bearing, +41. (41) is the bearing stand, 17+, (71) is the hollow chamber, +s+, (8
1) is a heat dissipation device, concave, (101) is a steam pipe, (10a
), (101a) is the flexible part, Q7:I, (
121) is a liquid pipe, 03 is a communication 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

Claims (1)

[Claims] (1) An annular hollow chamber formed between the bearing that supports the main shaft and the bearing stand that supports the bearing and in which the working liquid is sealed, and the hollow chamber that is connected to the hollow chamber by piping composed of a steam pipe and a liquid pipe. and a heat dissipation device in communication with each other. a second main spindle device, comprising a communication pipe that communicates the liquid pipe of the first main spindle device with the liquid pipe of the second main spindle device and has a flexible part that can be expanded and contracted; In addition, either the steam pipe or the liquid pipe of the second main shaft device is connected to the other heat radiating device, and either the steam pipe or the liquid pipe is provided with a flexible part that can be expanded and contracted, and the amount of heat of the bearing stand is reduced to the above. A multi-axis cooling device characterized in that heat is transported from the hollow chamber to the heat radiating device. (21) The multi-axis cooling device according to claim 1, wherein the flexible portion is constituted by a bellows.