JP2000117571A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove heat generated by sliding surface friction by forming a cavity in the bottom of a saddle sliding surface formed on a saddle of a machine tool and by passing coolant in the cavity. SOLUTION: Temperature sensors 22 embedded in a bed sliding surface and a saddle sliding surface 24 detect the temperature of the sliding surfaces. Based on the detected temperature information, a liquid temperature adjustment device sends appropriate temperature and flow rate of water or coolant to a coolant entrance of the bed sliding surface and a coolant entrance of the saddle sliding surface 24 via a line. If friction heat is generated in the sliding surface between the bed and the saddle 10, the water or the coolant is passed in a cavity 18 so as to reduce the heat generated by the sliding surface friction. If the friction heat is generated in the sliding surface between the saddle 10 and a table, the water or the coolant is passed in a cavity 26 formed in the bottom of the saddle sliding surface 24 so that the water or the coolant absorbs the heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool.

[0002]

2. Description of the Related Art In recent years, machine tools have been required to quickly position a workpiece in order to reduce a machining time.

[0003]

However, when the workpiece is quickly positioned to reduce the processing time, a large amount of frictional heat is generated on the sliding surface between the bed and the saddle or between the saddle and the table or the tool rest. The heat is transmitted to a bed, a saddle, a table, and the like, causing thermal displacement. For this reason, accuracy decreases.

[0004] In order to solve such inconveniences, an object of the present invention is to remove heat generated by sliding surface friction generated on a sliding surface of a bed or a saddle and to maintain accuracy by removing the heat.

[0005]

SUMMARY OF THE INVENTION One solution of the present invention is to form a cavity in a rib of a bed sliding surface formed on a machine tool bed, and to allow a cooling medium to pass through the cavity. Thus, the machine tool has a configuration capable of removing heat generated by sliding surface friction.

Another solution of the present invention is to form a cavity below a saddle sliding surface formed on a saddle of a machine tool,
A machine tool characterized in that heat generated by sliding surface friction can be removed by passing a cooling medium through a cavity.

[0007]

[Function] Even if frictional heat is generated on the sliding surface between the bed and the saddle, a cavity is formed in the rib and the cooling medium is passed through the cavity, so that the heat generated by the sliding surface friction is reduced. be able to.

[0008] Even if frictional heat is generated on the sliding surface between the saddle and the table or the tool post, a cavity is formed below the saddle sliding surface, and the cooling medium passes through the cavity. Heat generated by friction can be reduced.

[0009]

FIG. 1 shows a schematic diagram of a machine tool according to a preferred embodiment of the present invention. The machine tool includes a column 2, a bed 4, a spindle head 6, a saddle 10, and a table 12.

The bed 4 has ribs 8 formed thereon.
Above the rib 8, a saddle 10 is slidably supported. By driving the motor, the saddle 10 can slide in the Y direction. A table 12 is slidably supported above the saddle 10. By driving the motor, the table 12 can slide in the X direction. By driving the motor, the spindle head 6 can move up and down in the Z direction along the vertical direction of the column 2.

The temperature adjusting device 14 is connected via a cord 34 to a temperature sensor 22 embedded in each of the bed body 5, the rib 8, and the saddle 10. Further, the temperature control device 14 is connected to the inlet and outlet of the coolant formed on each rib 8 via lines 32 and 33. Further, the temperature control device 14 is connected to an inlet and an outlet of a coolant formed in the saddle 10 via lines 32 and 33, respectively.

FIG. 2 shows a column 2, a bed 4 and ribs 8 of a machine tool according to a preferred embodiment of the present invention. A cavity 18 is formed in the center of the rib 8 along the length direction of the rib 8. Water or cooling liquid can flow through the cavity 18.

A temperature sensor 22 is embedded in the bed sliding surface 20 of the rib 8. A temperature sensor 22 is also embedded in the center of the bed body 5. These temperature sensors 22 are connected to the liquid temperature controller 14.
With these temperature sensors 22, the bed sliding surface 2
The liquid temperature controller 14 can be controlled by measuring the temperature difference between 0 and the bed body 5.

FIG. 3 is a perspective view of the rib 8, the saddle 10, and the table 12 of FIG. Saddle 1 on rib 8
0 is slidably supported in the Y direction. The table 12 has an X on the saddle sliding surface 24 formed on the saddle 10.
It is slidably supported in the direction.

Saddle sliding surface 24 formed on saddle 10
A cavity 26 is formed below the space. This cavity 26
Water or cooling liquid flows through the inside. Water or cooling liquid can flow while the saddle 10 is moving.

Four temperature sensors 22 are embedded in the saddle sliding surface 24. A temperature sensor 22 is also embedded in the center of the saddle body 11. These temperature sensors 22 are connected to the liquid temperature controller 14. The temperature difference between the saddle sliding surface 24 and the saddle main body 11 is measured by the temperature sensors 22, and the temperature of the liquid temperature controller 14 is measured.
Can be controlled.

FIG. 4 shows a cross section of a portion where the temperature sensor 22 is embedded (particularly, the rib 8 in FIG. 3). The temperature sensor 22 is covered with a heat insulating material 28, and is attached to the attachment 30. The temperature sensor 22 embedded in the rib sliding surface 20 detects the temperature of the rib sliding surface 20 and transmits the temperature information to the liquid temperature controller 14.

FIG. 5 is a partial sectional view of a portion where the temperature sensor 22 is embedded (particularly, a portion of the saddle 10 in FIG. 3). The temperature sensor 22 embedded in the saddle sliding surface 24 detects the temperature of the saddle sliding surface 24,
The temperature information can be transmitted to the liquid temperature controller 14.

FIG. 6 shows a bed body 5 and a bed sliding surface 2.
2 shows the relationship between the liquid temperature controller 14 and the temperature sensor 22 embedded in the saddle body 11 and the saddle sliding surface 24, respectively.

The liquid temperature controller 14 can integrate all temperature information from the temperature sensors 22 provided on the bed body 5, the bed sliding surface 20, the saddle body 11, and the saddle sliding surface 24, respectively. The liquid temperature controller 14 is
Based on the temperature information, an appropriate temperature and flow rate of water or cooling liquid can be sent to the cooling liquid inlet of the bed sliding surface 20 and the cooling liquid inlet of the saddle sliding surface 20 via the line 32. .

Water or coolant flows from the coolant inlet of the bed sliding surface 20 and the coolant inlet of the saddle sliding surface 24 through the cavity 1.
8, 26, through the coolant outlet of the bed sliding surface 20, the coolant outlet of the saddle sliding surface 24, and back to the liquid temperature controller 14 via the line 33, where the temperature of the water or the coolant is reduced. It can be adjusted and reused.

In use, the workpiece W is placed on the table 12
The workpiece W can be machined by moving the saddle 10 and the table 12 for positioning, moving the saddle 10 and the table 12, and moving the spindle head 6 up and down. Here, when the saddle 10 and the table 12 are moved, frictional heat is generated between the bed 4 and the saddle 10 and on the sliding surface between the saddle 10 and the table 12.

On the other hand, the rib 8 and the saddle 10
The temperature sensors 22 embedded in the bed sliding surface 20 and the saddle sliding surface 24 detect the temperature of the sliding surface. Based on the temperature information detected from the temperature sensor 22, the liquid temperature control device 14 supplies water or cooling liquid at an appropriate temperature and flow rate through the line 32 to the bed sliding surface 20.
And the cooling liquid inlet of the saddle sliding surface 24.

For this reason, even if frictional heat is generated on the sliding surface between the bed 4 and the saddle 10, the water or the cooling liquid absorbs the heat because the water or the cooling liquid passes through the cavity 18 and slides. The heat generated by moving surface friction can be reduced.
Further, even if frictional heat is generated on the sliding surface between the saddle 10 and the table 12, the water or the cooling liquid flows through the cavity 26 formed below the saddle sliding surface 24, Absorbs heat and can reduce the heat generated by sliding surface friction.

Next, FIGS. 7 to 11 show modifications of the present invention.

FIG. 7 shows a modification of the rib 8 of FIG.

In FIG. 7, two cavities 16 are formed above the ribs 8. The sliding surface can be cooled by flowing water or a cooling liquid into the cavity 16 above the rib 8, and stronger cooling can be performed. The cavities 16 can be formed at three or more places. Of course, a cavity can be similarly formed in the case of the saddle 10.

In the modification shown in FIG. 8, the saddle 1 shown in FIG.
Below the 0 sliding surface, two polygonal cavities 26 are formed. By increasing the contact area between the water or the cooling liquid and the cylindrical cavity 26, it is possible to increase the heat absorption rate of the water or the cooling liquid and perform more efficient cooling.

The cavity 26 formed below the sliding surface of the saddle 10 can be formed in three or more places. Of course, polygonal cavities can be formed in the ribs 8 as well. Multiple cavities can also be formed. Also,
The shape of the cavity is not limited to a cylindrical shape or a polygonal shape.

A cavity 18 formed in the rib 8 or the saddle 10,
26 can be formed densely as needed.

FIG. 9 shows a modification of the cavity 26.
This corresponds to the AA cross section of the saddle 10 in FIG.

In the case of FIG. 9, the cavity 26 at the intersection of the saddle 10 and the bed sliding surface 20 is formed densely. Dense parts can be cooled particularly strongly.

FIG. 10 is a longitudinal sectional view showing a modification of the rib 8 of FIG. A temperature sensor 22 is embedded in the center of the rib sliding surface 20. A cooling liquid inlet IN is provided below the cooling liquid inlet IN. The water or the coolant that has entered from the coolant inlet IN flows left and right equally and is discharged from the left and right outlets OUT. The rib 8 frequently contacts the saddle at its center. Therefore, by cooling from the central portion, it is possible to quickly cool before distributing frictional heat due to sliding surface friction. Of course, the saddle 10 can have the same configuration.

FIG. 11 is a longitudinal sectional view showing a modification of the rib 8 of FIG. On the rib sliding surface 20, a plurality of temperature sensors 22 detect the temperature of each location, all the temperature information is transmitted to the liquid adjustment temperature adjustment device 14, and the liquid adjustment temperature adjustment device 14 can be controlled. it can. In addition, by watching the temperature distribution of the rib sliding surface 20, water or a cooling liquid can be flown from one or more optimal inlets to perform effective and efficient cooling.

The present invention is not limited to the embodiment described above. The number of the temperature sensors 22 provided on the bed body 5, the bed sliding surface 20, the saddle body 11, and the saddle sliding surface 24 can be appropriately increased.
By increasing the number of temperature sensors, the temperature state can be grasped more finely and the liquid temperature controller can be controlled more appropriately.

In the machine tool of the present invention, the table 12 is slidably supported on the saddle 10, but the support object is not limited to the table 12. A tool rest or the like may be slidably supported on the saddle 10.

In the present invention, the water or the cooling liquid is passed through the cavities 16, 18, and 26, but is not limited to the liquid, but may be a gas cooling medium.

[0038]

According to the present invention, the heat generated by the sliding surface friction on the bed sliding surface or the saddle sliding surface is removed, the thermal displacement of the bed, saddle, table, etc. is suppressed, and the accuracy is maintained. Can be.

According to the second or fourth aspect of the present invention, since the cooling medium having an appropriate liquid temperature and flow rate is sent to the cavities in the bed body, the bed sliding surface, the saddle body, and the saddle sliding surface, there is no waste. Efficient temperature control can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic view of a machine tool according to the present invention.

FIG. 2 is a perspective view showing a column, a bed, and a rib of the machine tool shown in FIG. 1;

FIG. 3 is a perspective view showing a rib, a saddle, and a table of the machine tool shown in FIG. 1;

FIG. 4 is a cross-sectional view showing a portion of the rib of FIG. 3 in which a temperature sensor is embedded.

FIG. 5 is a partial cross-sectional view showing a part of the saddle in FIG. 3 in which a temperature sensor is embedded.

FIG. 6 is a conceptual diagram showing a relationship between a temperature sensor embedded in various places and a liquid temperature adjusting device.

FIG. 7 is a sectional view showing a modification of the rib of FIG. 3;

FIG. 8 is a partial sectional view showing a modification of the saddle in FIG. 3;

FIG. 9 is a sectional view taken along the line AA showing a modification of the saddle in FIG. 3;

FIG. 10 is a longitudinal sectional view showing a modified example of the rib of FIG. 2;

11 is a longitudinal sectional view showing another modification of the rib in FIG. 2;

[Explanation of symbols]

 W Work 2 Column 4 Bed 6 Spindle head 8 Rib 10 Saddle 12 Table 14 Liquid temperature controller 16 Cavity 18 Cavity 20 Bed sliding surface 22 Temperature sensor 24 Saddle sliding surface 26 Cavity 32 Line 33 Line 34 Code

Claims (4)

[Claims] 1. A cavity (18) in a rib (8) of a bed sliding surface (20) formed on a bed (4) of a machine tool.
A machine tool characterized in that heat generated due to sliding surface friction can be removed by passing a cooling medium through the cavity (18). 2. A temperature sensor (22) is provided on the bed sliding surface (20) and the bed body (5), and a temperature difference between the bed sliding surface (20) and the bed body (5) is measured to obtain a liquid temperature. 2. The machine tool according to claim 1, wherein the adjusting device (14) can be controlled. 3. Forming a cavity (26) below a saddle sliding surface (24) formed on a saddle (10) of a machine tool, and passing a cooling medium through the cavity (26).
A machine tool having a configuration capable of removing heat generated by sliding surface friction. 4. A temperature sensor (22) is provided on the saddle sliding surface (24) and the saddle body (11), and a temperature difference between the saddle sliding surface (24) and the saddle body (11) is measured to obtain a liquid temperature. Machine tool according to claim 3, characterized in that the adjusting device (14) can be controlled.