JPS59118352A - 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 a communicating pipe 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 81, 8 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 from the liquid pipes 12, 121 through the vapor pipes 10, 101. The liquid pipes 12, 121 are mutually communicated by the communicating pipe 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-shaft cooling device that completely cools the bearings of, for example, a plurality of main shafts of a machine tool.

Conventionally, as this type of apparatus, the ones shown in FIGS. 1 and 2 have been rare. In each of these figures, (1) is the first and second spindle devices of the machine tool, which are arranged at an interval of span P. (21, e21) U main axis, +31°0
η is bearing, 14), (b) is bearing stand, +51, (5
1) is the pulley, and (6) is the bed.

Next, the operation will be explained. By a driving electric motor (not shown)! llv per) k via boo january 51. (51) due to the rotational force transmitted to the main shaft +21. al)' 0 At this time - main shaft (2j, CD and bearing stand (4j, (6
) is the bearing +a+, 0η located between the main M[21, &
1) Does it rotate smoothly? The a bearing 137. has the purpose of helping, but as it rotates, the bearing (a+, 0]) generates heat due to rc friction and its temperature rises. The amount of heat generated at eυ is transmitted to the bearing pedestal (4j), and is transferred to the bed (6) and the surrounding air to radiate heat.At this time, the temperature of the bearing pedestal (4) and αυ increases, and various parts due to thermal expansion thermal deformation and distortion occurs.As a result, the position of the main axis L2+ (21) changes,
Workpiece? The drawback was that machining accuracy decreased during machining.

Furthermore, there is a difference in the fluctuation of the position of the spindle +2+ and @1r between them, and at the same time there is a difference in the machining accuracy when performing multiple machining operations. The drawback is that it rarely occurs.

Is there a drawback to this invention over the conventional ones mentioned above? The purpose of this invention is to provide a multi-shaft cooling device that can effectively and evenly cool the first and second main shaft devices. An example will be explained based on FIGS. 8 and 4. Is diagram 3 a functional system? Block diagram shown, No. 4
The figure shows a cross-sectional side view, and in each of these figures, +7+
s (71) is an annular hollow chamber formed inside the bearing stand tn, Q1), (81, (81) is a heat dissipation device, and is cooled by cooling fans (91, (91)).

(10) with hollow chamber (7) and heat dissipation device (81)? The first steam pipe (101) communicates with the hollow chamber (71) and the heat radiator (8), and the second steam pipe (101) communicates with the heat radiator (8).
) and a first liquid pipe communicating with the first steam pipe (lO), (
121) is a heat dissipation device (81) and a second steam pipe (101)
N3 is a communication pipe that communicates the first liquid pipe @ and the second liquid pipe (121).

In addition, the hollow chamber t7+, (71) and the heat dissipation device t8),
(81), first and second steam pipes t101, (10
1) , first and second liquid pipes □, (121), communication pipe 0
After reducing the pressure inside the chamber, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed inside.

Next, the operation will be explained. Bearing stand (4), when the working liquid such as fluorocarbons in (71) is fully heated and vaporized, it is taken away as the latent heat of evaporation, and the vapor of vaporized fluorocarbons, etc. Using its own steam pressure, the first steam g110+' is passed through the heat dissipation device (
81] and the second steam pipe (101)' to the heat dissipation device (81), and the cooling fans +91 and (9
1), N is removed by the surrounding air. At this time, the chlorofluorocarbons etc. condense into vapor and return to liquid, but what about the latent heat of condensation? The entire heat of the bearing +a++(+υ) is radiated to the surrounding air.The condensed working liquid is transferred to the first and second liquid pipe ports, (
121) to the first and second steam pipes +101, (10
1), the bearing stand n+, the hollow chamber of (41) +71. Return to (71). Behavior like this? By repeating this process, all of the heat of the bearing stand [41, Gl']) is transported to the heat dissipation device (81), +81 for efficient cooling.

By the way, when the temperature rise (calorific value) of bearing stand +41 becomes larger than that of the other bearing stand (■), the hollow chamber (7) of bearing stand (4)
) The amount of vapor, vapor pressure, and vapor temperature during vaporization of the working liquid in one area are larger than those in the other. Hence the larger latent heat of vaporization? The 5A bearing stand +41 is cooled more and the bearing stand (
Will the temperature rise of 4) be larger than that of the other bearing stand ■? Works to suppress. The hollow chamber (7) of the bearing stand (4)
) to the high temperature steam vaporized in the first steam pipe t10.
1 g, move to the heat dissipation device (81), and then move to the heat dissipation device (81).
) A heat dissipation device for the working liquid condensed by heating.
The steam flows from the second steam pipe (101)k into the hollow chamber (71)K of the bearing stand (6). Therefore, the working fluid in the bearing pedestal (6) is warmed by the higher temperature, increasing the temperature rise, and the difference in temperature rise between the two bearing pedestals (4) and (6) is suppressed to a small value. In addition, the temperature rise of the bearing stand (6) is smaller than that of the bearing stand (4), and the working liquid in the hollow chamber (71) of the bearing stand (B) flows into the hollow chamber (7) of the shelf holder (4). The vapor cap, vapor pressure, and vapor temperature during vaporization are lower than that of the working liquid. Therefore, the second steam pipe (101), the heat dissipation device (8), the first
A lower temperature working liquid flows from the liquid pipe ① through the first steam pipe +101'i. As a result, the working fluid in the bearing pedestal (4) is cooled by the lower temperature, reducing the temperature rise, and the difference in temperature rise between the two bearing pedestals (4j, rabbit) is kept small. When it is returned, the amount of working fluid in the bearing pedestal (inner wall Q7) gradually decreases and the amount of working fluid in the hollow chamber (71) of the bearing pedestal increases. from the heat dissipation device (81) to the second
Steam pipe (101) i through the hollow chamber (7) of the bearing stand (b)
1) A portion of the working fluid that returns into the bearing pedestal (4) can be returned to the reservoir (7), serving to maintain a predetermined amount of both working fluids.

By repeating such operation noise, the heat generation amount and temperature rise of either of the bearing stands nr, (4'f) will increase, and the temperature of both the bearing stands (4) and (4'f) will increase. It works to keep the difference small, and both bearing stands (4) and targets are effectively cooled evenly. Therefore, it is possible to minimize the thermal deformation and distortion of the μ bearing in machine tools, improving machining accuracy. can be improved.

In addition, in the above embodiment, the cooling fan +9+, (91)
'I mentioned the case where the cooling fan t91 is used.
, (91) Natural air cooling may be used without using i, or similar effects can be obtained by using cooling water, oil, etc. other than cooling air as a cooling source.

Further, in the above embodiment, the hollow chamber +71. (71) k bearings (3), (
b), or bearing +a+, el) and bearing stand +4+
, 1.4 may be provided.

By the way, in the above description, the case where there are two spindle devices has been described, but the present invention can be fully applied to the case where there are three or more spindle devices, and the same effects as in the above embodiment can be achieved.

As described above, the present invention includes N1, a second main shaft device, each of which has an annular hollow chamber formed inside the bearing portion and in which a working liquid is sealed, and a heat radiating device that radiates heat of the bearing portion; A first steam pipe that fully communicates with the hollow chamber of the first spindle device and the heat radiator of the second spindle device, and the hollow chamber of the second spindle device and the heat radiator of the first spindle device? The second steam pipe, the heat dissipation device of the first spindle device, and the first steam pipe communicate with each other? A first liquid pipe that communicates with each other, a second liquid pipe that communicates with the heat dissipation device of the second spindle device and the second steam pipe, and a communication pipe that communicates with the first liquid pipe and the second liquid pipe? By providing heat in the bearing part and transporting the heat from the hollow chamber to the heat dissipation device, all the heat in the bearing part can be quickly removed and cooled efficiently and evenly, thereby minimizing thermal deformation and distortion of the bearing part. Is it possible to control the machining accuracy of machine tools? This can be seen as an extremely significant practical effect.

[Brief explanation of the drawing]

Is the conventional multi-shaft cooling device in Figure N1 and Figure 2? The cross-sectional side view, FIG. 3, and FIG. N4 show a multi-glaze cooling device according to an embodiment of the present invention. FIG. 2 is a block diagram and a cross-sectional side view. In the figure, 11+ and C11l are the first. Second main spindle device, (4), bearing stand (7), (71) hollow chamber, t8), (81) heat dissipation device, tlol,
(101) is the first and second steam pipes, concave, (121) is the first and second liquid pipes, and a3 is a communicating pipe.0 In addition, are the same numbers in the drawing the same or corresponding parts? show. Agent Makoto Kuzuno ~ Figure 1

Claims (1)

[Scope of Claims] (1) @An annular hollow chamber formed inside the bearing portion and filled with a working liquid, and a heat radiating device that radiates all of the heat of the bearing portion? a first spindle device and a second spindle device each having the first spindle device,
a first steam pipe that fully communicates the interior of the spindle device with the heat radiating device of the second spindle device, and a hollow chamber of the second spindle device that communicates with the heat radiator of the first spindle device; a second steam pipe, a first liquid pipe that communicates the heat radiating device of the first main shaft device with the first steam pipe, a heat radiating device of the second main shaft device and the steam pipe of M2, A second liquid pipe that communicates with the first liquid pipe and a communication pipe that fully communicates with the second liquid pipe? A multi-shaft cooling device with t% characteristics. +21 The multi-shaft cooling device according to claim 1, characterized in that a bearing stand is formed in the hollow chamber. (3) The multi-shaft cooling device according to claim 1, characterized in that a bearing is formed in the hollow chamber. (4) The multi-shaft cooling device according to claim 1, wherein the hollow chamber is formed between the bearing stand and the bearing.