JP2000107971A - Table feeding mechanism of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table feeding mechanism of machine tool which makes the vibration by the high speed operation of a table feeding mechanism using a ball screw hardly transmit to a machine main body, so as to improve the quality of a pressing surface accuracy. SOLUTION: In a table feeding mechanism of machine tool in which a table 1 is moved by the rotation of a ball screw 5 provided parallel to the moving direction of the table 1, a guide member 17 which is connected with the ball screw 5 by a connecting member 9 having a nut 8 screwed with the ball screw 5, and set parallel with the ball screw 5; a vibration absorbing member 12 fixed to the table 1; and a connecting member 13 to connect the guide member 7 and the vibration absorbing member 12; are provided to compose the table feeding mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a table feed mechanism for moving a table of a machine tool such as a surface grinder.

[0002]

2. Description of the Related Art Conventionally, a hydraulic cylinder has been used as a table feed mechanism of a surface grinding machine. The use of a hydraulic cylinder has the advantages of high-speed feed and easy reversal, but the rise in oil temperature has a large adverse effect on machine parts, and the essential problem of oil leakage was there.

Therefore, as a feed mechanism for solving the problems caused by the hydraulic pressure, a drive system using a ball screw is adopted. For example, Japanese Patent Publication No. 60-39496 discloses that a wire or a steel plate-like member is tensioned and fixed to a table while being positioned parallel to a guide surface, and a feed nut of a feed screw mechanism provided on a guide rail side is connected to the wire. Or, it is connected in the middle of the strip-shaped member, transmits the movement of the feed nut to the table by the tensile force of the wire or the strip-shaped member, and is a direction perpendicular to the tension direction of the wire or the strip-shaped member. A moving body feeding device has been disclosed which absorbs vibration caused by bending or bending of a feed screw by bending the table to move the table more precisely along the guide surface.

[0004]

However, the above-mentioned moving body feeding apparatus has a problem that vibration is generated due to a shock particularly when the table is turned over during high-speed operation, and such vibration adversely affects the feeding accuracy of the table. In addition to the above, there is a problem that such vibration is transmitted to the grinding head, thereby causing an inaccuracy in the machining surface of the workpiece.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention makes it difficult for a vibration caused by a high-speed operation of a table feed mechanism using a ball screw feed to be transmitted to a machine body, thereby improving the quality of a machined surface. Provides a mechanism.

[0006]

SUMMARY OF THE INVENTION A feed mechanism for a machine tool according to the present invention is a table feed mechanism for a machine tool which moves a table by rotating a ball screw provided in parallel with the moving direction of the table. A guide member connected to the ball screw and installed in parallel with the ball screw, a vibration absorbing member fixed to the table, and a connecting member connecting the guide member and the vibration absorbing member. Features.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a guide member is a linear guide, and a vibration absorbing member is connected to a table and is disposed in parallel with the rod, or a coupling mechanism provided on the table and the guide member. can do.

In the present invention, the vibration generated by the ball screw is transmitted to the bearing of the pillow block of the linear guide as the guide member via the connecting member, but most of the vibration is absorbed by the rigidity of the linear guide. Furthermore, the remaining vibration is absorbed by the vibration absorbing member connected to the table.

FIG. 1 is a plan view showing an embodiment of the feed mechanism of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a side view.

The table 1 is provided with a guide 3 of the body frame 2.
It is movably supported above. Brackets 4 are fixed to the left and right sides of the body frame 2, and ball screws 5 are rotatably attached to these brackets 4 so as to be parallel to the moving direction of the table 1. One end of the ball screw 5 is connected to a motor 6 for rotating the ball screw 5.

The body frame 2 is further provided with a linear guide as a guide member 7 in parallel with the ball screw 5. The linear guide 7 prevents the ball screw 5 from rotating, and ensures linear movement. The ball screw 5 is connected to the linear guide 7 by a connecting member 9 having a nut 8 screwed with the ball screw 5. The connecting member 9 is connected to the linear guide 7 via a pillow block 10 having a bearing.

At the lower part of the table 1, a vibration absorbing member 12 is provided.
The bracket 11 is fixed to the vibration absorbing member 12, and the bracket 11 and the connecting member 9 are connected by the connecting member 13.

Next, the operation of the feed mechanism of the present invention will be described.

When the motor 6 rotates, the ball screw 5 rotates, the connecting member 9 including the nut 8 screwed with the ball screw 5 moves, and the connecting member 9 moves along the linear guide 7 as a guide member. When the connecting member 9 moves, the connecting member 13 fixed to the pillow block 10 of the connecting member 9
Then, the table 1 is moved by the bracket 11 fixed thereto and fixed to the vibration absorbing member 12.

During high-speed movement, the vibration generated by the ball screw 5 is transmitted to the linear guide 7 and the pillow block 10, but most of the vibration can be absorbed by the rigidity of the linear guide 7. Further, the remaining vibration is absorbed by the bending in the longitudinal direction of the rod, which is the vibration absorbing member connected to the table.

FIG. 4 is a view showing another embodiment of the vibration absorbing member of the present invention. The couplings 14a and 14b provided on the table 1 and the guide member 7 can move freely in the vertical direction by a bearing structure 15. , In the left-right direction.

[0017]

According to the present invention, the circulating vibration caused by the high-speed operation of the ball screw can be absorbed by the vibration absorbing member. As a result, the circulating vibration of the ball screw is not transmitted to the table. And the machining surface accuracy of the workpiece can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a feed mechanism of the present invention.

FIG. 2 is a front view showing an embodiment of the feed mechanism of the present invention.

FIG. 3 is a side view showing one embodiment of the feed mechanism of the present invention.

FIG. 4 is a view showing another embodiment of the vibration absorbing member of the present invention.

[Explanation of symbols]

Reference Signs List 1 Table 2 Body frame 3 Guide 4 Bracket 5 Ball screw 6 Motor 7 Guide member (linear guide) 8 Nut 9 Connecting member 10 Pillow block 11 Bracket 12 Vibration absorbing member 13 Connecting member 14a, 14b
Coupling 15 Bearing structure

Claims (4)

[Claims] 1. A table feed mechanism for a machine tool for moving a table by rotation of a ball screw provided in parallel with the direction of movement of the table, wherein the table feed mechanism is connected to the ball screw by a connecting member having a nut screwed into the ball screw and parallel to the ball screw. An installed guide member, a vibration absorbing member fixed to the table,
A table feed mechanism comprising a connecting member for connecting a guide member and a vibration absorbing member. 2. The feed mechanism of a machine tool according to claim 1, wherein the guide member is a linear guide. 3. The feed mechanism of a machine tool according to claim 1, wherein the vibration absorbing member is a rod fixed to a table and arranged in parallel with a guide member. 4. The method according to claim 1, wherein the vibration absorbing member is a coupling mechanism provided on the table and the guide member, wherein the coupling mechanisms move freely in the up and down directions but are restricted in the left and right directions. 3. The method according to claim 1, wherein
The feed mechanism of the machine tool described in the above.