JPS59118355A - Multi-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, liquid pipes and a communicating pipe having flexible part to transport the quantity of heat of bearings from the hollow chambers thereof to heat radiating devices. CONSTITUTION:The quantity of heat of 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 evaporates 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 vapor pipes 10, 101. The liquid pipes 12, 121 are communicated mutually through the communicating pipe 13 having the flexible part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to a plurality of (1) main spindles of a machine tool, for example.
This invention relates to a multi-axis cooling device that cools a 1il receiving section.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2. In each of these figures, +o, tll) are the second spindle device of the machine tool, and are arranged at spacing /P. (2).

aLl is the main shaft, (3) 1st rule is the bearing, (4) and (rolling) are the bearing stands, i51 and +511 are the pulleys, and (6) is the bed.

Next, the details of the operation will be explained. V-Pel and Boo IJt5+ are provided via an electric drive lever (not shown) and a tiger.

■The rotational force transmitted to the main shaft +21, 1411
Rotate. At this time, the main axis (2), (2) pull and [I@
Bearing tall located between I bearing f3 (41s-)
, (foundation) has the purpose of helping the main shaft +21, (2υ rotate smoothly, but as it rotates, the bearing +3
1,01) generates heat due to friction and its temperature rises. bearing f
31. The amount of heat generated at pη is transmitted to the bearing stand f+) and Ω→, and is transferred to the bed (6) and the surrounding air, where it is radiated. At this time, the bearing stand! 41, +4]) increases in temperature,
Each part undergoes various thermal deformations and strains due to thermal expansion. As a result, the position of the spindle +21 (21) fluctuates, resulting in a drawback that the machining accuracy decreases when machining the workpiece. Furthermore, the mutual principal axis +21, l1f
There is a drawback that there is a difference in the variation in the position of r, and that there is a difference in the machining accuracy between the two processes, even though a plurality of processes are performed at the same time.

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 capable of effectively and evenly cooling the entire second spindle 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 complete functional system.
The figures are cross-sectional side views, and in each of these figures, (7),
(7υ is the bearing stand (4).

An annular hollow chamber formed inside the (goods), +8+ 1
+81) is a heat dissipation device, and cooling fans t9), (
91). +10), (101
) is hollow chamber +7), (711 and heat dissipation device +811
Steam pipes connecting <8υ, (country, (121)
is the heat dissipation device i81, (811 and steam pipe [10),
(101) are liquid pipes that communicate with each other. (+
1 communicates the liquid pipe 021 and the liquid pipe (121), and also includes a flexible part (ILL) such as a bellows that can be expanded and contracted.
It is a communicating pipe with

Direction, hollow chamber (7), (7++ and heat dissipation device t8)
e''s steam pipe scream, (101), liquid pipe 0ri, (
After the inside of the communicating tube (1(8) of 121) is vacuumed, a predetermined amount of a working liquid such as ammonia or fluorocarbon is sealed therein.

Next, the operation will be explained. Bearing stand...+1. The bearing received heat in (6) +31, the amount of heat at G3 is in the hollow chamber (7)
, When the working liquid such as fluorocarbons in the ffl is heated and vaporized, it is used as vapor latent heat, and the vaporized fluorocarbons and other vapors utilize their own vapor pressure to move through the steam pipes [101, (101
) to the heat dissipation device L81 and tal, where it is cooled by surrounding air by a cooling fan (9) s 191). At this time, vapors such as fluorocarbons condense and return to liquid, but the latent heat of condensation is released into the surrounding air.
of heat is radiated to the surrounding air. The condensed working liquid flows from the liquid pipes (12) and (121) to the steam pipes jlO) and (1
01) and the hollow chamber (7) of the Foundation using gravity.

Return to (7+).

By repeating this operation, the bearing stand i
4), G11) heat dissipation device +8+, ta
1) for efficient cooling by transporting heat.

By the way, if the temperature rise (heat amount) of the bearing pedestal (4) is larger than that of the other bearing pedestal □, )il, the vapor temperature during vaporization of the working liquid in the hollow chamber (7) of the bearing pedestal (4) will increase. ·pressure·
temperature becomes higher than the other. Therefore, the bearing pedestal (4) is cooled by absorbing a larger amount of latent heat of vaporization, and the bearing pedestal (4) is cooled more greatly.
4) It works to suppress the temperature rise from becoming larger than that of the other bearing. and the hollow chamber (7) of the bearing stand (4)
The high pressure and temperature steam vaporized inside the steam pipe tio+
The working liquid that is condensed and liquefied in the heat radiating device (8) has a higher temperature than the working liquid that is condensed in the heat radiating device j8tl, and passes through the liquid pipe F121 to the bearing stand (4). Hollow chamber (7) K flows in and is twisted, liquid pipe 02)
A part of the high-temperature working liquid that passes through the communication pipe O (to) flows from the a pipe (121) to the steam pipe (1013'ft) into the hollow chamber C: Iυ of the bearing pedestal 00.

The temperature of the working fluid in the row of hollow chambers of the bearing pedestal (9) is increased to increase the temperature rise of the bearing pedestal θυ.

By repeating these operations, when the heat generation amount and temperature rise of either the bearing stand +41 or W force starts to increase, the difference in temperature rise between both bearing stands (4) and (rolling) can be kept small. Works like a double bearing stand j4).

is effectively cooled on average. Therefore, in a machine tool, thermal deformation and distortion of the bearing portion can be suppressed to a minimum, and machining accuracy can be improved.

The span P between the main shaft (2) and the main shaft body movement is connected to the connecting pipe (1
It can be made variable within the expansion/contraction range of the flexible part (13a) in 3).

In addition, in the above embodiment, the cooling fan +91, (91+
Although we have described the case where a cooling fan (9) is used,
Similar effects can be obtained by cooling with natural air without using (91), or by using cooling water, oil, etc. other than cooling air as a cooling source.

In the above embodiment, the flexible part (18a) is made of bellows, but it may be made of a flexible part other than bellows that can be expanded and contracted.

In the above embodiment, the case where the inside is provided in the chamber t71 and (711 in the bearing stand t4+, (4)) is described, but the hollow chamber +7) * ('II is provided in the bearing t
31, C(I), or bearing t3+, C3υ
It is also possible to have one role between the bearing stand (4) and the bearing stand (4).

By the way, in the above explanation, the case where there are two main spindle devices has been described, but the present invention can be applied even in the case of eight or more main 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 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. , a second spindle device each having a liquid pipe that communicates the heat dissipation device and the steam pipe, and a second spindle device that communicates the liquid pipe of the first spindle device with the liquid pipe of the second spindle device and is expandable and retractable. By providing a communication pipe between the flexible parts and transporting the heat of the bearing part from the hollow chamber to the heat dissipation device, the heat of the bearing part can be quickly removed and cooled efficiently and evenly. This has a great practical effect of suppressing the total amount of thermal deformation and distortion of the parts to a minimum and improving the machining accuracy of machine tools.

[Brief explanation of the drawing]

1 and 2 are cross-sectional side views showing a conventional multi-shaft cooling device, and FIG. 8 and FIG. 4 are a 70-piece diagram and a cross-sectional side view showing a multi-shaft cooling device according to an embodiment of the present invention. . In the figure, the mountain, (+1) is the ol, the second spindle device,
(4), (roll) is the bearing stand, (71, gυ is the hollow chamber, (8
], (811 is a heat dissipation device, (101, (101) are steam pipes, (121) is a liquid pipe, (131 is a communication pipe. In addition, the same reference numerals in the figure indicate the same - or f target parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3/ //

Claims (1)

[Scope of Claims] Ill 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. first and second spindle bags d each having a pipe and a liquid pipe that communicates the heat radiating device and the steam pipe; A multi-axis cooling device characterized by comprising a communication pipe having a flexible part that can be expanded and contracted while communicating with the slider. (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. +41 A self-mounted multi-shaft cooling device, characterized in that the hollow chamber is formed between the bearing stand and the bearing. (5) The multi-axis cooling device according to any one of claims 71 to 4, characterized in that the flexible portion is constituted by a bellows.