JPS59118356A - 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 laten 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 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 vapor pipes 10, 101 are mutually communicated through the communicating pipe 13.

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, fi+.

(11) is the second spindle device of the machine tool plate, which is arranged at an interval of span P. +21, (2υ is the main shaft, +31, C3υ is the bearing, (4), (6) are the bearing stands, +51, +51) are the pulleys, and (6) is the bed.

Next, the operation will be explained. The main shaft +21, (211) is rotated by the rotational force transmitted by the driving electric motor (not shown) to the boot 51, (5υ) via the V-belt tracker. At this time, the main shaft f21, (211 and the bearing stand (
The bearing t31, 01) located between 4) and (6) has the purpose of helping the main shaft +21, H rotate smoothly, but as it rotates, the bearing t31, <6D
generates heat due to friction and the temperature rises. bearing! 31, (
3]) is transmitted to the bearing stand (4)-, and is transferred to the bed (6) and the surrounding air to radiate heat. Apart from this, the temperature of the bearing stand (4) increases, and various parts undergo various thermal deformations and strains due to thermal expansion. Therefore, the main axis t2+,
There was a drawback that the position of +211 fluctuated and the machining accuracy decreased when machining a workpiece of km. Furthermore, there is a drawback that there is a difference in the fluctuation of the position of the main axis f21, (31) 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 to eliminate the drawbacks of the conventional ones as described above, and provides a multi-shaft cooling device that can effectively and evenly cool the second main shaft device. It is aimed at C.

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 Kinen system, Figure 4
The figures are cross-sectional side views, and in each of these figures +7)
, f7+) is an annular hollow chamber formed inside the bearing stand (4), and +8), +81) are heat dissipation devices, which are cooled by cooling fans +9+, (91). tio+, (101) is a hollow chamber (7+,
(71) and a heat dissipation device (8).

(Steam pipes connecting 8υ, 112), (1
21) is a heat dissipation device +8), (81) and steam pipe +lO
), (1011 are liquid pipes that communicate with each other.(
13) is a communication pipe that communicates the steam pipe (lO) and the steam pipe (101).

Inquiry, hollow chamber (71, H and heat dissipation device (81, (81)
1 steam pipe 10), (lil), liquid pipe Q21. (
121) After reducing the pressure inside the communication pipe 03), a predetermined amount of a working liquid such as ammonia or chlorofluorocarbon is sealed therein.

Next, we will explain the operation. The amount of heat received by the bearing stand (4), the bearing (3), and the heat in the hollow chamber (7), and the power)
When heating and vaporizing the working liquid such as fluorocarbons inside, it is taken away as vapor latent heat, and the vapor of the vaporized fluorocarbons uses its own vapor pressure to pass through the steam pipe C1ot, (via 10η to the heat dissipation device t8), 181 ) and turn on the cooling fan (9).

(91) and is cooled by the surrounding air. At this time,
Vapors such as fluorocarbons condense and return to liquid, but they release latent heat of condensation to the surrounding air, and the amount of heat from the bearings 13], e]) is radiated to the surrounding air. The condensed working liquid flows through the liquid pipes (121, (
121), returns to the hollow chamber (7), ffυ of the bearing ff'J (4' + (Foundation)) using gravity via the steam pipe +10+, [101).

By repeating the operation sound like 0, WI + receiving f; tql , (n) (1) Qijy amount? The heat dissipation device 14 (8), +81) KmS is sent to ensure efficient cooling.

By the way, when the bearing stand (41 is the other bearing stand - temperature rise compared to JJK, - amount) becomes larger, li! Li1 Sentence (4) In addition to absorbing a large amount of latent heat of vaporization and cooling the bearing pedestal 141 to a greater extent, the bearing pedestal 14) is
) The heat dissipation device (8j7 is not far away, and air flows into the other heat dissipation device (ne) through the communication pipe (131) to a higher pressure/temperature. This is seen from the bearing stand (4) side. and the other heat radiating device (81) through the communication pipe (131'), the heat radiating capacity increases and the cooling capacity further increases.In addition, in the heat radiating device; Room (7
) The higher temperature steam that has flowed into the hollow chamber 1711 mixes with the lower temperature steam that has flowed into the hollow chamber 1711, and as a result, the hollow chamber συ according to the shaft head rule! The temperature of the increased steam becomes 1°. Therefore, the temperature of the working fluid condensed and liquefied by the heat dissipation device also increases, and the autopsy table (
(b) increases the temperature rise.

I don't want to do this type of ML, both lll
1I] When the heat generation and temperature rise of either of the bearings (4) and (foundation) begins to increase, both bearings 141 work to keep the difference in temperature rise small, and both bearing stands 14
1° (turn) is effective cooling on average. Therefore, in machine laminated boards, the thermal deformation of bearings should be minimized by 4'll.
The machining accuracy can be improved completely.

In addition, in the above 6th example, the case where the cooling fan [91, filυ was used was described, but the cooling fan t91, filυ was used.
Similar young fruits can be obtained by natural air cooling without using Iυr, or by using cooling water, oil, etc. other than 6° cooling air as a cooling source.

In addition, in the above example, the case where the hollow chamber (71, ff1i is provided in the bearing stand (4) and
*Or bearing; 31, GIU and @cradle (4), (
It may also be provided between the

By the way, in the above explanation, the explanation was made regarding a lifting platform with a fixed lifting platform, but the present invention can also be applied to a case of three or more spindle devices, and the same effect as the above embodiment can be obtained. play.

As explained above, the present invention includes: an annular hollow chamber formed inside a bearing portion and filled with a working liquid; a heat radiating device for radiating heat from the bearing portion; and a steam pipe communicating the hollow chamber and the heat radiating device. and a second main spindle device, each having a liquid pipe that communicates the heat radiating device with the steam pipe, and a second main shaft device that communicates the steam pipe of the main spindle device of the first one with the steam pipe of the second main spindle device. Connection, tube? By providing heat in the bearing part and transporting all 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.
This has an extremely large practical effect in that thermal deformation and distortion of the bearing part can be suppressed to a minimum and the machining accuracy of machine tools, etc. can be completely improved.

[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, H, (11) is the main shaft device of the oar, fang 2, (
4), (b) is the bearing stand, f7+, (711 is the hollow chamber, (8), is the heat dissipation device, (101, (10) is the steam pipe, G2i, (121) is the liquid pipe α rise is the communication pipe The same reference numerals in the figures indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] [11] An annular hollow chamber formed inside the bearing portion and filled with a working liquid, a heat radiating device for radiating heat from the bearing portion, and steam communicating the hollow chamber and the heat radiating device. and a liquid pipe that communicates the heat radiating device with the steam pipe. A multi-shaft cooling device comprising a second main shaft device, and a communication pipe that communicates a steam pipe of the second main shaft device with a steam pipe of the second main shaft device. (2) The multi-shaft 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.