JP2000042864A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain thermal deformation of a column by integrally molding a cooling medium penetrating passage in the shape of a through hole in a wall material of a column wall of the column of a machine tool main body by casting, and flowing a cooling medium to the cooling medium penetrating passage. SOLUTION: A coolant penetrating passage 9 is integrally molded in the shape of a through hole in a wall material of a column wall 8 by casting so as to pass through into the wall material of the column wall 8 to both side surfaces of the column wall 8. At time of working, a spindle rotates at a high speed. Heating is caused in the bearing part in a spindle head and the meshing part of gears by this high speed rotation. These heat is transmitted up to a column 3, so that the column 3 is easily thermally deformed. In this case, since a coolant flows in the coolant penetrating passage 9 on the inside of the column wall 8, this generating heat is absorbed to thus prevent deformation by heat of the column 3, thereby machines a work with high accuracy by a tool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a machine tool.

[0002]

2. Description of the Related Art In recent years, the speed of a spindle of a machine tool has been increased in order to increase the processing efficiency.

[0003]

However, when the speed of the main shaft is increased as described above, heat generated from bearings and gear drive units in the column is increased, and the heat is transmitted to the column. Deformation is likely to occur. For this reason, the processing accuracy is reduced.

[0004] It is an object of the present invention to provide a machine tool capable of minimizing thermal deformation of a column and improving machining accuracy.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a cooling medium through passage integrally formed in a wall material of a column wall of a column of a machine tool main body in the form of a through hole by casting. A cooling medium is supplied to the machine tool to cool a column of the machine tool body.

[0006]

[Function] Even if the heat generated in the main shaft etc. in the column is transmitted to the column, the cooling medium is caused to flow through the cooling medium through passage integrally formed in the wall material of the column wall into a through hole by casting. Can be cooled efficiently. In addition, since the cooling medium flows along the cooling medium through-path integrally formed into the wall material of the column wall in the form of a through hole by casting, not only is the efficiency high, but also the temperature of the machine body can be controlled without unevenness. .

Further, since the coolant passage is formed in the wall material of the column wall, the column wall can be cooled from the wall material of the column wall, and the outside can be in contact with air. Therefore, the heat transmitted to the column is absorbed by the cooling medium in the wall material of the column wall, and heat is radiated to the air outside the column wall. Therefore, cooling can be performed more efficiently.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.

The machine tool includes a bed 1, a table 2, a column 3, a spindle head 4, and the like. The table 2 is set on the bed 1 and can be moved in the X direction by driving the motor 5. The column 3 can be moved in the direction of the arrow Y1 or Y2 by driving the motor 6. The spindle head 4 is the column 3
Can be moved up and down in the direction of the arrow Z1 or Z2 by driving the motor 7 along the vertical direction.

FIG. 2 shows the column 3 and the bed 1 of the machine tool. A tubular coolant passage 9 is provided in the wall material of the column wall 8 in the form of a through hole. That is, the coolant passage 9 is integrally formed in the wall material of the column wall 8 by casting so as to pass through the wall material of the column wall 8 to both side surfaces of the column wall 8.

The coolant passage 9 is formed by using covers 10 at both ends of the through hole. The holes of the tubular cooling medium passage 9 which are formed on both sides of the column wall are covered with the cover 10.
It is tied at. Thus, one coolant passage 9 is formed. The cover 10 is attached to the column 3 with screws. Inlet 1 for coolant passage 9
1 and an outlet 12 are provided. These entrances are connected to lines 13 and 14, respectively (see FIG. 1). The coolant is supplied from the coolant storage unit 15 via the line 13, passes between the coolant passages 9 inside the column wall, and returns to the storage unit 15 via the line 14.

FIG. 4 is a sectional view taken along the line AA of FIG. 3, showing the manner in which the coolant passage 9 and the cover 10 are used. A temperature sensor 18 is embedded in each of the covers 10 by being covered with a heat insulating material 29. Each temperature sensor 1
Reference numeral 8 is connected to a temperature / flow rate controller 24 by conducting wires 19 to 23, respectively.

The temperature / flow rate controller 24 can set the temperature and flow rate of the coolant to predetermined values according to the temperature detected by the temperature sensor 18.

FIG. 5 is a conceptual diagram of the cooling liquid storage section 15. As shown in FIG.
According to the program set by the temperature / flow rate controller 24, the operation unit 25 of the coolant storage unit 15 adjusts the temperature of the coolant in the cooling tank 26, and operates the pump 27 to adjust the flow rate of the coolant. Entrance 1 via line 13
1 to send the cooling liquid. In this way,
The temperature control is performed by adjusting the temperature and flow rate of the coolant according to the temperature detected by each temperature sensor 18 embedded in the cover 10.

In use, as described with reference to FIG. 1, the position of the table 2 is set, the column 3 is moved, and the spindle head 4 is further lowered.
The upper workpiece W is processed. During this processing, the main shaft 16 rotates at a high speed. Due to this high-speed rotation, heat is generated in a bearing portion and a gear meshing portion in the spindle head. These heats are transmitted to the column 3. As a result, the column 3 is apt to undergo thermal deformation.

However, since the coolant flows through the coolant passage 9 inside the column wall 8, the generated heat is absorbed. Further, the heat generated outside the column wall is radiated to the air. Therefore, deformation of the column 3 due to heat can be prevented. Therefore, the workpiece 17 can be processed with high accuracy by the tool 17.

The present invention is not limited to the embodiment described above. For example, the cross-sectional shape of the cooling medium passage 9 is not limited to a circular shape.

FIG. 6 is a sectional view showing a column wall according to another embodiment. The column wall 8 is manufactured by casting in the form of a through hole so that the cross section of the cooling medium through passage 9 is polygonal. In this case, the contact area between the cooling medium and the inside of the wall material of the column wall 8 is larger than that having a circular cross section. Therefore, heat absorption is performed more efficiently.

The width of the cooling medium passage 9 may not be uniform, and may be appropriately widened or narrowed. Further, the cooling medium through passage 9 may be formed more densely as appropriate.

FIG. 7 shows an AA cross section of the column wall 8 when the cooling medium passage 9 is made denser. By doing so, the entire surface of the column wall 8 can be effectively cooled even when the heat transmitted to the column 3 is large.

The cooling medium passage 9 can be provided not only at the side surface of the column but also at any place where the upper and lower surfaces can be installed. Coolant passage 9 installed in the area where it can be installed
Can be connected by a cover 10 to form a single continuous passage.

The number of cooling medium passages 9 provided on one side may be two or more. In the embodiment shown in FIG. 8, one cooling medium passage 9 is formed on one side surface of the column wall 8 on the inside and outside, respectively. In this case, it is possible to send the cooling medium at an appropriate temperature and an appropriate flow rate to the inner and outer cooling medium passages 9 independently of each other so as to have different temperatures. Accordingly, more efficient temperature control without waste can be achieved.

In the embodiment shown in FIG.
Are provided with two inlets 11 and two outlets 12 on one side surface, and two cooling medium passages 9 are provided. In this case, the upper and lower coolant passages 9 having different temperatures are provided with:
A cooling medium of an appropriate temperature and an appropriate flow rate can be sent independently. Accordingly, more efficient temperature control without waste can be achieved.

In the embodiment shown in FIG. 10, a part of the surface of the column wall 8 is provided with irregularities. By doing this,
The contact area of the column wall 8 with the air is increased, so that the heat transmitted to the column 3 is radiated to the air more efficiently.

The cooling medium passage 9 is not only laterally, but also
It can be arranged in other directions. In the embodiment shown in FIG. 11, the coolant passage 9 is formed in a vertical direction. Even in this case, temperature control can be efficiently performed without unevenness.

If the water flow needs to be considerably increased, the cover 10 may have a curved shape as shown in FIG. As shown in FIG. 13, the flow path may be slightly inclined. These reduce the burden on the cover.

The cover 10 shown in FIG. 14 is formed in a tubular shape. In this case, more side surfaces of the column wall can come into contact with air, and heat can be more efficiently radiated from the side surface of the column wall to air.

When the temperature of the column wall 8 is more finely controlled, two or more temperature sensors 18 may be embedded in one cover 10.

In the embodiment shown in FIG. 15, two temperature sensors 18 are embedded in one cover 10. In this case, one of the two temperature sensors 18 is disposed near the flow path, and the other is disposed away from the flow path. By doing so, the temperature condition of the column can be grasped more minutely, and more precise temperature control becomes possible.

The temperature sensor can be provided not only on the cover but also in other places or in a combination of various places.

[0031]

As described above, according to the present invention,
Processing can be performed with high precision by suppressing thermal displacement of the column. Therefore, the accuracy of the product can be improved. In particular, since the coolant passage is integrally formed into the through hole in the wall material of the column wall of the column of the machine tool body by casting, and the coolant flows through the coolant passage, the entire column is efficiently and uniformly distributed. Can be cooled. Therefore, the influence of thermal deformation is smaller, and the processing accuracy can be further improved.

When replacing the cover, since the covers are independent of each other, it is not necessary to replace the entire cover, and only the necessary parts are necessary. Therefore it is economical.

By attaching a temperature sensor,
Since the temperature and the flow rate of the cooling medium are adjusted according to the detected temperature, it is possible to perform cooling with higher accuracy and efficiency.

[Brief description of the drawings]

FIG. 1 is a side view showing a machine tool according to a preferred embodiment of the present invention.

FIG. 2 is a perspective view showing a column and a base of FIG. 1;

FIG. 3 is a sectional view of a column wall of the machine tool shown in FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a conceptual diagram of a coolant storage section of the machine tool shown in FIG.

FIG. 6 is a sectional view showing a column wall of a machine tool according to another embodiment of the present invention.

FIG. 7 shows a column wall A showing still another embodiment of the present invention.
-A sectional drawing.

FIG. 8 is a perspective view of a column wall showing still another embodiment of the present invention.

FIG. 9 is a perspective view of a column wall showing still another embodiment of the present invention.

FIG. 10 is a sectional view taken along line AA of a column wall showing still another embodiment of the present invention.

FIG. 11 is a perspective view of a column and a base showing still another embodiment of the present invention.

FIG. 12 is a sectional view of the column wall taken along line AA, showing a modification of the cover.

FIG. 13A is a cross-sectional view of a column wall taken along line AA showing a modification of the cover. (B) is a BB view of (A).

FIG. 14A is a sectional view taken along line AA of a column wall showing a modification of the connection cover. (B) is a diagram viewed along line CC of (A).

FIG. 15 is a cross-sectional view taken along line AA of a column wall showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 3 Column 4 Spindle head 8 Column wall 9 Coolant passage 10 Cover 13, 14 Line 15 Coolant storage part 18 Temperature sensor 19, 20, 21, 22, 23 Conductor 24 Temperature / flow rate controller 28 Convex part 29 Thermal insulation material 30 mounting part 31 screw

Continued on the front page (72) Inventor Shigeru Yamada 1870 Todekomyoji, Takaoka-shi, Toyama F-term in Kitamura Kikai Co., Ltd. 3C048 BB01 EE01

Claims (3)

[Claims] 1. A cooling medium through passage is integrally formed in a wall material of a column wall of a column of a machine tool body by casting in the form of a through hole, and a cooling medium is flowed through the cooling medium through passage. A machine tool characterized in that the column is cooled. 2. The machine tool according to claim 1, wherein a cooling medium through passage is formed by using covers at both ends of the through hole. 3. The machine tool according to claim 2, wherein a temperature sensor is set on the cover to control the temperature of the cooling medium.