KR950003042B1 - Device for cooling spindle head of machine - Google Patents

Abstract

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Description

Cooling System of Machine Tool

1 is a side view showing an embodiment of a machine tool according to the present invention;

2 is a side view showing a part of the spindle head of the machine tool shown in FIG.

3 is a plan sectional view of the spindle head.

* Explanation of symbols for main parts of the drawings

1: bed 2: table

3: column 4: spindle head

5, 6, 7, 11: Motor 10: Tool holder

12: spindle 13, 14, 15, 17: gear

16: axis 18: output shaft

19 tool 20 outer wall

21: inner wall 22: cooling oil

23: storage box 25: oil tank

26, 27: cooling medium line (Line) 30: bearing

W: Workpiece

The present invention relates to a cooling device in a machine tool having a spindle head.

In order to increase the processing efficiency, the machine tool spindle is designed to operate at high speed. Long spindle rotation at high speeds generates a lot of heat in bearings, gears and other rotational components.

As a result, the spindle and the spindle head for supporting the spindle are susceptible to deformation by heat, resulting in poor machining precision.

It is an object of the present invention to provide a cooling device for a machine tool having a spindle and a medium such as a spindle head for supporting the spindle and cooling oil for cooling the spindle head.

The present invention for achieving the above object is a bed, a table installed relatively movable with respect to the bed, a vertical column installed on the bed, a spindle head installed to move vertically along this column, A cooling device of a machine tool comprising a spindle extending rotatably at a lower portion and a spindle driving means mounted in the spindle head for rotationally driving the spindle. Stacking oil is formed between the outer wall and the outer wall, characterized in that the cooling oil supplied into the oil space through the line from the oil tank is circulated along the line.

EXAMPLE

Next, the Example of the preferable form of this invention is described, referring drawings.

As in FIG. 1, a general machine tool consists of a bed 1, a table 2, a column 3 and a spindle head 4. As shown in FIG.

The table 2 is placed on the bed 1 so that it can be operated in the direction of arrow X by the motor 5. The column 3 is adapted to be operated in the directions of arrows Y1 and Y2 by the motor 6. The spindle head 4 can move up and down in the directions of arrows Z1 and Z2 by the motor 7 along the vertical plane of the column 3.

In FIG. 2, the spindle head 4 rotatably supports the spindle 12.

The spindle 12 has a gear 13 which is engaged with a gear 4 fixed to the shaft 16. The gear 15 fixed to the shaft 16 is engaged with the gear 17 fixed to the output shaft 18 of the motor 11. When the shaft 18 rotates, the rotational force of the motor 11 is transmitted to the spindle 12 through the gears 17, 15, 14, and 13. The tool holder 10 is mounted to the lower end of the spindle 12 so as to be attached and detached, and the tool 19 is mounted in the tool holder 10.

The cooling oil 22 shown in FIG. 2 is connected to the outer wall 20 and the inner wall of the spindle head 4 via the cooling medium line 27 from the oil tank 25 as in FIG. 1 by a known pump or the like. It is fed into the oil space formed between 21. The cooling oil 22 is also returned from the oil space to the oil tank 25 by the cooling medium line 26.

In summary, the cooling oil 22 is circulated to flow through the oil space between the outer wall 20 and the inner wall 21 formed in the spindle head 4, thereby cooling the spindle head 4. .

As shown in Figs. 2 and 3, the spindle head 4 is composed of an outer wall 20 and an inner wall 21, and an oil space is formed therebetween. This oil space has a rectangular cross-sectional shape as shown in Fig. 3, but can be a circular ring in the design of a machine tool. In other words, it has a double structure having an inner wall 21 in addition to the outer wall 20 of the spindle head 4.

In action, the table 2 is placed at an arbitrary position. The inner wall 21 functions as a storage box 23 for the gears 13 to 17 and other parts.

As best shown in FIG. 2, the oil space is formed almost over the entire length of the inner wall 21.

As in FIG. 3, the front circumference of the inner wall 21 is completely surrounded by the oil space.

The column 3 moves horizontally, and the spindle head 4 moves downwards so that the workpiece W on the table 2 can be processed by the tool 19 while the spindle 12 rotates at high speed. .

Therefore, since a lot of heat is generated in the gears 13 to 17, the bearing 30, and other engaging portions, the temperature of the storage box 23 rises as a result. The spindle head 4 is therefore easily deformed by heat.

However, as the cooling oil 22 flows through the spindle head 4, especially the oil space therein, heat is effectively transferred to the cooling oil 22, so that the temperature of the storage box 23 is not excessively increased. Do not.

Therefore, deformation of the spindle head 4 or the storage box 23 can be avoided, and the work W can be precisely machined by the tool 19.

The invention is not limited to the described embodiments, but may be applied to any type of machine, including, for example, woodworking machines.

Claims (1)

A bed (1), a table (2) mounted relatively movable with respect to the bed (1), a vertical column (3) installed on the bed (1), and a vertical movement along this column (3) A spindle head 4, a spindle 12 extended to be rotatable below the spindle head 4, and spindle drive means mounted in the spindle head 4 for rotationally driving the spindle 12. In the cooling device of the machine tool comprising a, the outer circumference of the spindle head 4 is surrounded by the outer wall 20 to form an oil space between the outer wall 20 and the inner wall 21, the oil Cooling device (22) characterized in that the cooling oil (22) supplied to the interior of the oil space through the line (27) from the tank 25 is circulated along the line (26).

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