JPS59118361A - Mutli-spindle cooling device - Google Patents

Abstract

PURPOSE:To cool a main spindle device effectively and evenly by a method wherein operating liquid is flowed through vapor pipes as well as liquid pipes and a communicating pipe, both of which are equipped with flexible parts, 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 the vapor pipes 10, 101 and is cooled by cooling fans 9, 91. The condensed operating liquid returns into the hollow chambers 71, 7 of the bearing stands 41, 4 from the liquid pipes 12, 121 having the flexible parts through the vapor pipes 101, 10. The liquid pipes 12, 121 are mutually communicated through the communicating pipe 13 having the flexible parts.

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 (11) are the first and second main devices of the machine tool, which are arranged at an interval of span P. (2), (21) are tri main shafts, (3) and (31) are bearings, (4) and (41) are bearing stands, (5) and (51) are pulleys, and (6) is a bed.

Next, the operation will be explained. Main ll1ll] (2), (21) by a rotary blade which is transmitted to the pulleys (5), (51) via a V-belt by an electric drive aid (not shown).
Rotate. At this time, the bearings (3), (3) located between the main shafts (2), (21) and the bearing stands (4), (41)
1) has the purpose of helping the main shaft C2), (21) rotate smoothly, but as it rotates, the bearing (3),
(31) generates heat due to friction and its temperature rises.

Bearings (3) and (31)K occurred. 4 tii n m
cradle (4), (41) Vrcli wari, bed (6)
and radiates heat by transferring it to the surrounding air.

Due to this, the temperature of the bearing stands (4) and (41) increases, and various parts undergo thermal deformation and distortion due to thermal expansion. For this reason, the positions of the main parts 11i1(2) and (21) fluctuate, resulting in a disadvantage that machining accuracy is reduced when machining a workpiece.

Furthermore, it is possible to create a difference in the cross-cutting at the positions of the main m (2) and (21) between each other, and to perform multiple processes at the same time.
There was a drawback that there was a difference in machining accuracy between the two.

The present invention has been made in order to eliminate the drawbacks of the conventional ones as described above, and an object of the present invention is to provide a multi-shaft cooling device that can effectively and evenly cool the first and second main shaft devices. It is an object.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Figure 3 is a lock diagram on the push side showing the functional system, and Figure 4 is a top view. The formed hollow chambers (8) and (81) are heat radiating devices and are cooled by cooling fans (9) and (91). (10) is the hollow chamber (7) and the heat dissipation device (8)
The first steam pipe (101) communicates with the hollow chamber (71
) and the heat radiating device (81), a second steam pipe '
(12) is a heat dissipation device (8) and a second steam pipe (101)
For example, the expansion and contraction of bellows etc. 0IJ'
a first liquid pipe having a flexible part (12a) capable of
121) is a second liquid pipe that connects the heat dissipation device (81) and the first steam pipe (10), and also connects, for example, to the telescopic 7-way girder part (121a) of a bellows. This is a communication pipe that communicates the liquid pipe (12) of No. 1 with the liquid pipe (121) of fJ2, and has a flexible part (13a) capable of expanding and contracting, for example, a bellows.

In addition, the hollow chambers (7), (71) and the heat dissipation device (8),
(81), first and second steam pipes (10), (101)
, first and second liquid pipes (12), (121), communication pipe (1
3) After reducing the pressure inside the chamber, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed inside the chamber.

Let me briefly explain the operation. The amount of heat received by the bearings (3), (31) in the bearing stands (4), (41) is transferred to the hollow chamber (7),
(71) Inner P70 n, etc.; The movable liquid is heated and vaporized as latent heat of vaporization, and the vaporized 70 n temple steam is converted into the first vapor -1 (10 ) to 14
to the heat dissipation device (8) through the second steam pipe (10i), and the cooling fans (9),'
(91), it is cooled by the surrounding metal air. At this time,
Vapors such as fluorocarbons condense and return to liquid, but the -7d heat of condensation is released into the surrounding metal, and the amount of heat from the bearings (3) and (31) is released into the surrounding air.

The condensed working liquid flows through the first and second liquid pipes (12) and (1
21) to the second and first steam pipes (101), (10)
is returned to the hollow chambers (71), (7) of the bearing stands (41), (4) using gravity with one diameter. By repeating such a TiIJ process, the amount of heat from the bearing stands (4) and (41) is transferred to the heat radiating devices (8) and (81) 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. Steam pressure/
The steam temperature becomes higher than the other. Therefore, a larger amount of latent heat of evaporation is absorbed, the bearing stand (4) is cooled more thoroughly, and the temperature rise of the bearing stand (4) is suppressed from becoming larger than that of the other bearing stand (41). Then, the high-temperature steam vaporized in the hollow chamber (7) of the bearing stand (4) moves through the first steam pipe (1o) to the heat radiator (8) at 14; The condensed working liquid is transferred to the heat dissipation device (81) K
The temperature of the working liquid is higher than that of the working liquid that condenses in the first liquid pipe (1
2) from the second steam pipe (101) to the bearing stand (4) at 114.
1) flows into the hollow chamber (71). Therefore, the bearing stand (4
In 1), the temperature of the working liquid is relaxed by the amount of the sieve, the temperature rise is slowed down, and the difference in temperature rise between the two bearing stands (4) and (41) is small. In addition, the temperature rise of the bearing pedestal (41) is smaller than that of the shaft pedestal (4), and the working fluid in the hollow chamber (71) of the bearing pedestal (41) is
7) Inner work # Amount of vapor vaporized by the fan compared to liquid, vapor pressure,
Steam temperature is low. Therefore, a lower temperature working liquid flows from the second steam pipe (1o1), the heat dissipation device (81), and the second liquid pipe (12) through the steam pipe (1o) of nest 1.As a result, the bearing In the stand (4), the working liquid is cooled by the lower temperature, reducing the temperature rise, and both bearing stands (4), (
41) The difference in temperature rise can be kept small. As this operation is repeated, the hollow chamber (
7) decreases and the working liquid layer in the hollow chamber (71) of the bearing stand (41) increases;
3) from the heat dissipation device (8) to the first liquid pipe (12),
The second steam pipe (101) allows a portion of the working liquid which returns via the hollow chamber (71) of the bearing pedestal (41) to be returned to the hollow chamber (7) of the bearing pedestal (4); It works to keep the amount of liquid at a predetermined level. By repeating these operations9, if the heat generation amount and temperature rise of either of the bearing stands (4) and (41) begins to increase, both bearing stands (4) and (41)
11 Reduce the difference in temperature rise between pedestals (4) and (41) (l-
Both bearing stands (4) and (41) are cooled evenly and effectively. Therefore, in the machine tool, thermal deformation and distortion of the bearing portion can be minimized, and the degree of machining can be improved. In addition, the span P between the main shaft (2) and the main shaft (21) is the 15th second liquid pipe (12),
(121), flexible part (12a) of communication pipe (13)
), (121a), and (13a).

Incidentally, in the above embodiment, the case where cooling fans (9) and (91) are used is described, but cooling fans (9) and (91) are used.
Similar young fruits can be obtained by natural wind cooling without using cooling air, or by using cooling water, oil, etc. other than cooling air as a cooling source.

Further, in the above embodiment, the flexible parts (12a) and (1
21a) and (13a) are constructed with bellows. The flexible part which can be expanded and contracted may be constructed with a material other than the bellows.

Furthermore, in the above embodiment, the hollow chambers (7) and (71) were provided in the bearing stands (4) and (41), respectively, but the hollow chambers (7) and (71) were provided in the bearing stands (3) , (31
), or bearings (3), (31) and 41ilI cradle (
4) and (41).

By the way, in the above explanation, the case where the number of spindle devices is 21 is described, but the present invention can also be applied to a case where three or more spindle devices are used, and the same effects as in the above embodiment can be obtained.

As described above, the present invention provides first and second main shafts each having a hollow chamber formed inside a bearing portion and filled with a working fluid, and a heat radiating device for radiating heat from the bearing portion. a first steam pipe that communicates the hollow chamber of the first spindle device with the heat radiating device of the first spindle device; and a first steam pipe that communicates the hollow chamber of the second spindle device with the heat radiator of the second spindle device; a second steam pipe, a first liquid pipe that communicates between the heat dissipation device of the first spindle device and the second steam pipe and has a flexible section capable of expansion and contraction; In addition to communicating with the steam pipe of the bearing, it also transfers heat to the equipment.It quickly removes the heat from the bearing and cools it efficiently and evenly.
It has an extremely large practical effect in that it can minimize thermal deformation and distortion of the bearing part and improve the degree of machining of machine tools.

[Brief explanation of the drawing]

FIGS. 1 and 2 are side views showing a conventional multi-axis cooling device, and FIGS. It is. In the figure, (1) and (11) are number 1.5! I: 2 main shaft device, (4), (41) are bearing stands, (7), (71)
rfi hollow chamber, (8), (81) are heat dissipation devices, (10)
, (101) i'j first and second steam pipes, (12),
(121) are the first and second liquid pipes, (12a), (121
a) is 7 Lexi 7”/l/ part, (13) is a communicating pipe,
(13a) is a flexible portion. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 8

Claims (5)

[Claims] (1) Formed inside the III1111 receiving part and made by dJ
first and second spindle devices each having an annular hollow chamber in which the rack body is enclosed and a heat radiating device that radiates heat from the bearing portion; the hollow chamber of the first spindle device; and the first spindle. a first steam pipe communicating with the heat radiating device of the apparatus; a second steam pipe communicating the hollow chamber of the second main shaft device with the heat radiating device of the second main shaft device; A first liquid pipe that communicates between the heat dissipation device and the second liquid pipe and has a 7 lexigulue part that is extendable and retractable; a first liquid pipe that communicates the heat dissipation device of the second spindle device with the first liquid pipe; A second liquid pipe having a flexi-guru part with a diameter of η, and a communication pipe having a 7-flexi-guru part that communicates the first liquid pipe and the second liquid pipe and is capable of expansion and contraction at 0T. Multi-axis cooling device. (2) The multi-4QLL 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 stand and the bearing. (5) The multi-axis cooling device according to any one of claims 1 to 4, characterized in that the 7 lexigle portions are constituted by bellows.