JPH10202461A - Vibration control method and device for shaft feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the vibration of a movable member such as a carriage in a shaft feed device, and improve shaft feed accuracy for the movable member. SOLUTION: A shaft feed device 13 has a carriage 11 screwed to a drive shaft 15 freely rotatable in normal and reverse directions via a rotation drive means, so as to keep the carriage 11 freely movable back and forth. Also, the carriage 11 is provided with a mass damper 19 having a weight 27 moving in a direction within a phase opposite to the travel of the carriage 11. According to this construction, even when a vibration occurs on the carriage 11 during the travel and stoppage thereof on the operation of a motor 17, the weight 27 moves along a direction within a phase opposite to the travel of the carriage 11. As a result, the vibration of the carriage 11 attenuates more quickly, thereby stabilizing the stopping or positioning accuracy of the carriage 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration method and apparatus for a shaft feeder used in a punch press, a laser beam machine, or another machine tool, and more particularly, to a method for rotating and reversing a rotary drive means such as a motor. The present invention relates to an anti-vibration method and apparatus for a shaft feeder in which a movable member such as a carriage is screwed to a rotatable drive shaft, and the movable member is provided to be movable back and forth.

[0002]

2. Description of the Related Art Conventionally, an axis feeder has been used as a means for moving a movable member of a machine tool. For example,
As shown in FIG. 3, a center table 103C and a side table 103 provided in the punch press 101 are provided.
A carriage base 105 is provided on one side of M, and a carriage 109 having a clamp device 107 for clamping the work W is provided on the carriage base 105.
It is configured to move in the X-axis direction. In addition,
The carriage base 105 is moved in the Y-axis direction together with the side table 103M. Shaft feeder 111
Is for moving the carriage 109 in the X-axis direction, and the carriage 109 is a drive shaft 11 such as a ball screw.
3, and the drive shaft 113 is rotatably connected to the drive shaft 113 by a rotation drive means such as a motor 115.

When the drive shaft 113 rotates forward and backward by driving a motor 115, the carriage 109
3, the workpiece W clamped by the clamp device 107 is positioned at a desired position.

[0004]

By the way, in the conventional shaft feeder 111, when the rigidity of the carriage 109 is low, or when the heavy work W is clamped and moved by the clamp device 107 of the carriage 109, the carriage 109 is not moved. Since vibration occurs in the carriage 109 when the shaft is fed, there has been a problem that the stop position accuracy of the carriage 109 is not stable and the positioning accuracy of the work W is not stable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to prevent vibration of a movable member of a shaft feeder and improve the axis feed accuracy of the movable member. To provide an anti-vibration method and apparatus.

[0006]

According to one aspect of the present invention, there is provided a shaft feeder according to the present invention.
A vibration damping method for a shaft feeder, wherein a movable member is screwed into a drive shaft that is rotatable forward and backward by a rotation drive unit, and the movable member is moved in the axial direction of the drive shaft by forward and reverse rotation of the drive shaft. In addition, a weight attached to the movable member so as to be movable in the axial direction is moved in a phase opposite to the movement of the movable member to attenuate the vibration of the movable member.

Therefore, even if the movable member moves due to the rotation of the drive shaft driven by the rotary drive means, and the movable member vibrates during this movement, the weight moves in the opposite phase to the movement of the movable member. The vibration of the member is damped faster. In particular, when the rotation of the drive shaft stops, the unstable vibration of the movable member quickly converges, so that the stopping accuracy and the positioning accuracy of the movable member are easily stabilized. In particular, as compared with the related art, the stop accuracy is remarkable at the time of high-speed feeding.

According to a second aspect of the present invention, there is provided an anti-vibration device for a shaft feeder, wherein a movable member is screwed onto a drive shaft rotatable forward and backward by a rotary drive means, and the movable member is rotated by forward and reverse rotation of the drive shaft. What is claimed is: 1. A vibration damping device for an axis feed device provided movably in an axial direction of said drive shaft, wherein said movable member is provided with a mass damper having a weight which moves in a phase opposite to the movement of said movable member. It is characterized by the following.

Therefore, the operation is similar to that of the first aspect, and since the weight moves in the opposite phase to the movement of the movable member, the vibration of the movable member is attenuated more quickly, and the stopping accuracy and the positioning accuracy of the movable member are stabilized.

According to a third aspect of the present invention, there is provided an anti-vibration device for an axial feeder according to the second aspect, wherein the weight is provided movably in the axial direction of the movable member. An elastic body for pressing the weight toward the center of the weight is provided on both sides of the weight.

Therefore, the elastic body pressing the weight toward the center of the weight from both sides moves the weight in the axial direction in response to the movement of the movable member. Is moved in a phase opposite to that of the movable member because the weight is heavy.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a shaft feeder according to a first embodiment of the present invention;

The shaft feeder according to this embodiment is a device for moving a movable member such as a carriage or another member of a punch press, a laser beam machine, or another machine tool back and forth.

The machine tools such as the punch press and the laser beam machine are already known, so that the description thereof will be omitted. The vibration damping method and device of the shaft feeder according to the present embodiment will be described with reference to FIGS. 1 and 2. A punch frame 1 as a machine tool is provided with a main frame 3 having a substantially C-shape. A center table 5C and a side table 5M are provided in the center of the main body frame 3 and on both front and rear sides (left and right in FIG. 1) in the X-axis direction.

A carriage base 7 is provided on one side of the center table 5C and the side table 5M. Inside the carriage base 7, a carriage 11 (movable member) having a clamp device 9 for clamping a work W is provided. The center table 5C and the side table 5 are provided.
Axial feeder 1 provided on one side of M (upper side in FIG. 1)
3 to move and position in the X-axis direction. The carriage base 7 is a side table 5M.
Also, it can be moved and positioned in the Y-axis direction.

A drive shaft 15 such as a ball screw is screwed into the carriage 11 of the shaft feeder 13.
Are rotatably connected by a rotation driving means such as a motor 17.

The above-mentioned carriage 1 has the above-mentioned carriage 1
An anti-vibration device 21 having a mass damper 19 that moves in the opposite phase to the movement of the first and attenuates the vibration of the carriage 11 is provided. More specifically, the mass damper 19 is provided with two support members 2 on the upper surface of the carriage 11 in the example of the present embodiment.
3 is provided upright, and a wheel such as a roller 25 is interposed between the two support members 23 in the X-axis direction (the axial direction of the drive shaft 15).
Is provided with a movable weight 27.
7 are springs 29 on both sides of the weight 27 in FIG.
It is pressed toward the center of the weight 27 via the (elastic body). Note that the weight 27 is in the carriage 1
1 may be configured to slide on the upper surface.

It is desirable that the weight 27 has a maximum weight within a range that does not cause a large load when the carriage 11 is moved and accelerated.

The motor 17 is rotated to drive the drive shaft 15.
Is rotated forward and backward, so that the carriage 11
5, the workpiece W clamped by the clamp device 9 is positioned at a desired position.

When the carriage 11 is axially fed or stopped, vibration occurs in the carriage 11. With the above-described configuration, the weight 27 reacts to the vibration of the carriage 11 due to the urging force of the spring 29 and the vibration of the damping motion is generated. do. The weight 27 vibrates out of phase with the vibration of the carriage 11, that is, moves in a phase opposite to the movement of the carriage 11, so that the vibration of the carriage 11 in the X-axis direction is efficiently attenuated.

For example, when the movement of the carriage 11 stops due to the stop of the rotation of the drive shaft 15, particularly unstable vibration occurs in the carriage 11, but the weight 27 causes the spring 29 to move due to the inertial force accompanying the movement of the carriage 11. The weight 2 is pressed by the damping motion of the two springs 29.
Since 7 moves in the opposite phase to the movement of the carriage 11, the vibration of the carriage 11 in the X-axis direction is attenuated more quickly.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes. In the example of the present embodiment, the carriage provided with the clamp device is used as a movable member, and the axis feeder that moves the carriage is described as an example. However, the vibration isolation of the axis feeder that moves other movable members of the machine tool is described. It may be a device.

[0023]

As can be understood from the above embodiment, according to the first aspect of the present invention, the movable member moves by the rotation of the drive shaft driven by the rotary drive means. Even if vibration occurs in the movable member, the vibration of the movable member can be attenuated more quickly because the weight moves in the opposite phase to the movement of the movable member. In particular, even when the rotation of the drive shaft stops, unstable vibration of the movable member generated at this time can be quickly converged, so that the stopping accuracy and the positioning accuracy of the movable member can be stabilized. In particular, at the time of high-speed feeding, it is remarkable in that the stopping accuracy is improved.

According to the second aspect of the present invention, similar to the first aspect, the weight moves in the opposite phase to the movement of the movable member, so that the vibration of the movable member is attenuated more quickly, and the stopping accuracy of the movable member is reduced. And stabilize positioning accuracy. Further, the vibration isolator has a simple structure and is inexpensive.

According to the third aspect of the present invention, the elastic body pressing the weight from both sides toward the center of the weight moves the weight in the axial direction in response to the vibration of the movable member. However, since the weight is heavy, the vibration is delayed, and the movement of the movable member can be easily performed in the opposite phase to the movement of the movable member. The movement of the weight causes the vibration of the movable member to be attenuated more quickly. be able to.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention and is a plan view of a shaft feeder provided with a vibration isolator.

FIG. 2 is a front view taken along line II-II of FIG.

FIG. 3 shows a conventional example and is a plan view of a shaft feeder.

[Explanation of symbols]

 Reference Signs List 1 punch press 3 main body frame 5 table 9 clamp device 11 carriage (movable member) 13 axis feed device 15 drive shaft 17 motor (rotation driving means) 19 mass damper 21 vibration damping device 23 support member 25 roller 27 weight 29 spring (elastic body)

Claims (3)

[Claims] 1. A shaft feeder, wherein a movable member is screwed to a drive shaft rotatable in forward and reverse directions by a rotation drive means, and the movable member is moved in the axial direction of the drive shaft by forward and reverse rotation of the drive shaft. A shaft feeding device, wherein a vibration attached to the movable member in an axial direction is moved in a phase opposite to the movement of the movable member to attenuate the vibration of the movable member. Anti-vibration method. 2. A shaft in which a movable member is screwed to a drive shaft rotatable in forward and reverse directions by a rotary drive means, and the movable member is movably provided in the axial direction of the drive shaft by forward and reverse rotation of the drive shaft. What is claimed is: 1. A vibration damping device for a feeder, wherein said movable member is provided with a mass damper having a weight that moves in a phase opposite to the movement of said movable member. 3. The weight is provided so as to be movable in the axial direction of the movable member, and elastic members are provided on both sides of the weight so as to press the weight toward the center of the weight. The vibration isolator for a shaft feeder according to claim 2, wherein