JPH106094A - Device for restricting vibration in press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely restrict vibration on a machine frame even if the vibration state of the machine frame is changed caused by changing a punching condition. SOLUTION: A weight 17 is installed at a lower end of a lifting rod 13, disc springs 19, 21 are installed between the upper side of a supporting plate 9 and the upper end part of the lifting rod 13 and between the lower side of the supporting plate 9 and the upper side of the weight 17 respectively, 1st racks 25, 33 extending to the upper and lower direction are installed on the machine frame 3, 2nd racks 27, 35 extending to the upper and lower direction are installed on the weight 17, pinions 29, 37 engaging the 1st racks 25, 33 and the 2nd racks 27, 35 are installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration suppressing device for suppressing vibration of a pair of machine frames generated when a punch in a press machine punches a work.

[0002]

2. Description of the Related Art A vibration suppressing device in a conventional press machine will be briefly described.

[0003] A support plate is provided between a pair of machine frames facing each other in the press machine, and a lifting bolt is provided on the support plate so as to be able to move up and down. A weight is screwed on the lower end of the lifting bolt, and a plate having a predetermined spring constant is provided between the upper side of the support plate and the upper end of the lifting bolt and between the lower side of the support plate and the upper side of the weight. A spring is provided.

Therefore, when the punch moves downward and hits the work, the machine frame is deformed upward (in the direction opposite to the direction of movement of the punch), and elastic energy due to the deformation is stored in the machine frame. Further, when the punch moves downward and punches the work, the elastic energy is released at a time, and the machine frame vibrates. On the other hand, when the machine frame vibrates, the weight vibrates under the opposite phase to the vibration of the machine frame due to the action of the disc spring or the like, and the vibration of the machine frame is suppressed.

[0005]

By the way, the vibration of the machine frame generated when a workpiece is punched differs depending on the punching conditions and is not uniform. Therefore, in order to vibrate the weight under the opposite phase to the vibration of the machine frame, it is necessary to change the spring constant of the disc spring for each punching condition, and the operation of suppressing the vibration of the machine frame becomes complicated. There's a problem.

[0006]

In order to solve the conventional problems as described above, in the present invention, as a first means, a support plate is provided between a pair of opposed machine frames of a press machine. An elevating rod is provided on the support plate so as to be able to move up and down, and a weight is provided at a lower end of the elevating rod. Each body (including spring, urethane rubber etc.) is provided,
It is characterized in that a follow-up mechanism for vibrating the weight under the opposite phase following the vibration of the machine frame is provided.

As a second means, in addition to the invention-specific matter of the first means, the following mechanism is provided on the machine frame and extends vertically in a first rack; A second rack extending in the direction, and a pinion meshed with the first rack and the second rack.

Accordingly, when the punch moves in the traveling direction and hits the work, the machine frame is deformed in the direction opposite to the direction of the punch movement, and elastic energy due to the deformation is stored in the machine frame. Further, when the punch moves in the traveling direction and punches the work, elastic energy is released at a time, and the machine frame vibrates.

On the other hand, when the machine frame vibrates, the weight is vibrated under the opposite phase following the vibration of the machine frame by the operation of the following mechanism. According to the second aspect of the present invention, when the machine frame vibrates integrally with the first rack, the weight follows the vibration of the machine frame due to the action of the rack and the pinion, and the weight of the weight is opposite to that of the first frame. Vibrates integrally with the second rack. Thereby, vibration of the machine frame can be suppressed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIGS. 1 and 2, a punch press 1 which is an example of a press machine includes front and rear portions (right and left in FIG.
2 includes a pair of machine frames 3 facing diagonally lower right and diagonally upper left), and the pair of machine frames 3 are connected by an appropriate connecting member 5 or the like. The punch press 1 includes a vibration suppressing device 7 that suppresses vibration of the machine frame 3. Hereinafter, the vibration suppressing device 7 will be described in detail.

A support plate 9 is provided between the pair of machine frames 3 via a bracket 11, and a plurality of lifting bolts 13 are provided on the support plate 9 via a guide hole 15 so as to be able to move up and down. A weight 17 is screwed to the lower ends of the plurality of lifting bolts 13, and a disc spring 19 is provided between the upper side of the support plate 9 (the upper side in FIGS. 1 and 2) and the upper end of each lifting bolt 13. Similarly, a disc spring 21 is provided between the lower side of the support plate 9 and the upper side of the weight 17 in each lifting bolt 13.

A follow-up mechanism 23 for vibrating the weight 17 under the opposite phase following the vibration of the machine frame 3 is provided.

More specifically, a first front rack 25 extending in the vertical direction is provided on the front machine frame 3.
On the front side of the weight 17, a second front rack 27 extending in the vertical direction is provided. And the machine frame 3 on the front side
A front pinion 29 meshed with the first front rack 25 and the second front rack 27 is rotatably provided via a bracket 31. Similarly, a first rear rack 33 extending vertically is provided on the rear machine frame 3, and a second rear rack 3 extending vertically is provided on the rear side of the weight 17.
5 are provided. A rear pinion 37 meshing with the first rear rack 33 and the second rear rack 35 is rotatably provided on the rear machine frame 3 via a bracket 39. The front pinion 29 and the rear pinion 3
7 may be provided on the weight 17 instead of being provided on the machine frame 3.

Next, the operation of the embodiment of the present invention will be described.

When the punch (not shown) moves downward and hits the work (not shown), the machine frame 3 is deformed upward (in the direction opposite to the direction of movement of the punch), and the mechanical frame 3 is elastically deformed. Energy is stored. further,
When the punch moves downward and punches a workpiece, elastic energy is released at one time, and the machine frame 3 vibrates.
On the other hand, when the machine frame vibrates, the machine frame
When the front rack 25 and the first rear rack 33 vibrate integrally, due to the action of the racks 23, 27, 33, 35 and the pinions 29, 37, as shown in FIG. Following this, it vibrates integrally with the second front rack 27 and the second rear rack 35 under the opposite phase. Thereby, the vibration of the machine frame 3 generated when the workpiece is punched is suppressed.

According to the embodiment of the present invention as described above,
Since the weight 17 is vibrated in the opposite phase to the vibration of the machine frame 3, even if the punching condition changes and the vibration state of the machine frame 3 changes, the machine frame 3 can be reliably rotated.
Vibration can be suppressed.

[0018]

According to the first or second aspect of the present invention, the weight is vibrated under the opposite phase following the vibration of the machine frame. , The vibration of the machine frame can be reliably suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a vibration suppression device.

FIG. 2 is a schematic perspective view of a punch press.

FIG. 3 is an operation explanatory view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punch press 3 Machine frame 7 Vibration suppression device 9 Support plate 13 Lifting bolt 17 Weight 19, 21 Belleville spring 23 Follower mechanism 25 First front rack 27 Second front rack 29 Front pinion 33 First rear rack 35 Second rear side Rack 37 Rear pinion

Claims (2)

[Claims] 1. A supporting plate is provided between a pair of opposed machine frames of a press machine, a lifting rod is provided on the supporting plate so as to be able to move up and down, a weight is provided at a lower end of the lifting rod, and an upper part of the supporting plate is provided. An elastic body is provided between the upper end of the lifting rod and between the lower side of the support plate and the upper side of the weight, and a follow-up mechanism is provided to follow the vibration of the machine frame and vibrate the weight under the opposite phase. A vibration suppressing device for a press machine, characterized in that: A second rack provided on the machine frame and extending in the vertical direction; a second rack provided on the weight and extending in the vertical direction; The vibration suppressing device for a press machine according to claim 1, further comprising a pinion meshed with the rack.