JPH08238599A - Ram driving devic of press machine - Google Patents

Abstract

PURPOSE: To provide a ram driving device of press machine which makes the vibration low by restricting the vibration to generate caused on the movement of a ram assembly together with the low noise while keeping the high productivity as the press machine. CONSTITUTION: A ram rotary shaft 5 being freely rotating is supported on a frame 1, a double cam 7 composed of a ram lowering cam 7A and a ram raising cam 7B is attached to this ram rotary shaft 5, and a ram assembly 11 providing a striker 9 on the lower side is installed freely movable up and down on the frame 1. A 1st, a 2nd rollers 13, 15 supported freely rotating with the ram assembly 11 are made with rotating in contact with the lowering cam 7A, the ram raising cam 7B respectively and a vibration restricting device 19 to move a weight 17 composed of almost same weight in the reverse phase is installed on the ram assembly 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ram drive device of a press machine for vertically moving a striker striking the punch in order to punch a work in a press machine in cooperation with a punch and a die.

[0002]

2. Description of the Related Art Conventionally, as a ram driving device of a press machine for driving a striker striking the punch in order to perform punching processing on a work in a press machine, for example, JP-A-5-23890 is known.
Japanese publications are known.

As the ram drive device, as shown in FIG. 3, a rotatable rotary shaft 105 is supported by a frame 101 of a press machine via a bearing 103. The rotary shaft 105 is rotationally driven by a drive motor (not shown).

A ram lowering cam 10 is mounted on the rotary shaft 105.
Double cam 10 consisting of 7A and ram lifting cam 107B
7 is attached. In addition, the frame 101 includes a ram assembly 111 having a striker 109 at a lower portion.
Is provided. A rotatable first roller 113 and a rotatable second roller 115 are supported on the lower portion and the upper portion of the ram assembly 111, and the first roller 113 and the second roller 115 are respectively attached to the ram lowering cam 107A and the ram lowering arm. It is in rolling contact with the ascending cam 107B.

With the above structure, when the rotary shaft 105 is rotated as shown by the arrow in FIG.
A rotates, and the ram assembly 111 descends via the first roller 113 according to the eccentricity thereof, and then the ram lifting cam 107B rotates to raise the ram assembly 111 via the second roller 115 according to the eccentricity. Therefore, the ram assembly 111 is moved up and down by the rotation of the rotary shaft 105.

Since the striker 109 is provided in the lower portion of the ram assembly 111, for example, when the striker 109 strikes a punch, the punch and the die cooperate to punch the work. .

The ram lowering cam 107A has a shape that slows the movement of the ram assembly 111 when punching a work to reduce the working noise, and realizes the lowest noise working.

[0008]

In the ram drive device described above, in order to increase the vertical movement speed of the ram assembly 111 and increase the productivity of the press machine, the double cam 107 is rotated at a high rotational speed. Need to let.

However, for low noise machining, the ram assembly 111 is used only when machining work is performed in one cycle.
Since the movement of the ram assembly 111 is slowed, a rapid acceleration / deceleration of the ram assembly 111 occurs before and after that. Further, the ram assembly 111 has a structure that requires strength in order to enable processing of, for example, 30 tons, and its weight is also large.

Therefore, there is a problem in that the ram assembly 111, which has a large weight, moves abruptly and a large vibration is applied to the frame 101, and the vibration is transmitted to each part of the press machine and further vibrates the ground. .

An object of the present invention is to provide a ram drive device for a press machine, which is low in noise while suppressing the vibration generated by the movement of the ram assembly while maintaining high productivity as a press machine. Especially.

[0012]

In order to achieve the above object, a ram drive device according to a first aspect of the present invention supports a rotatable ram rotating shaft on a frame, and the ram lowering cam is mounted on the ram rotating shaft. And a ram lifting cam are mounted, and a ram assembly having a striker at the bottom is provided on the frame so as to be vertically movable, and the first and second rollers rotatably supported by the ram assembly are respectively mounted on the ram assembly. The ram lowering cam and the ram raising cam are brought into rolling contact with each other, and the ram assembly is provided with a vibration suppressing device for moving weights having substantially the same weight as the ram assembly in opposite phases.

According to a second aspect of the present invention, there is provided a ram driving device for a press machine, wherein the vibration suppressing device is a pinion engaged with first racks provided on both sides of the ram assembly, and the pinion is engaged with the pinion in a vertical direction. It is characterized in that the second rack is extended and the weights are attached between the upper portions of the respective second racks.

[0014]

With the ram drive device of the press machine according to the first and second aspects of the present invention, when the ram rotating shaft is rotated, the ram lowering cam and the ram raising cam also rotate. The ram assembly is vertically moved via the first roller and the second roller. By the vertical movement of the ram assembly, the movement is transmitted to the first rack, the pinion, and the second rack of the vibration suppressing device. As a result, the weight is moved up and down in a phase opposite to the phase of the ram assembly, so that the force generated by the abrupt movement of the ram assembly is canceled by the weight and the vibration force to the frame is suppressed.

[0015]

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

With reference to FIGS. 1 and 2, a rotatable ram rotating shaft 5 is supported by a frame 1 of a press machine via a bearing 3. The ram rotating shaft 5 is rotationally driven by a drive motor (not shown).

A ram lowering cam 7 is attached to the ram rotating shaft 5.
A double cam 7 including A and a ram raising cam 7B is mounted. Further, the frame 1 is provided with a ram assembly 11 having a striker 9 at the lower part. A rotatable first roller 13 and a rotatable second roller 15 are supported on the lower portion and the upper portion of the ram assembly 11, respectively. It is rollingly contacted with the ascending cam 7B.

With the above structure, when the ram rotating shaft 5 is rotated as shown by the arrow in FIG. 1, the ram lowering cam 7A is provided.
Rotates, and the ram assembly 11 descends via the first roller 13 according to the amount of eccentricity, and then the ram raising cam 7
The rotation of B causes the ram assembly 11 to rise via the second roller 15 in accordance with the amount of eccentricity, so that the ram assembly 11 is vertically moved by the rotation of the ram rotation shaft 5.

Since a striker 9 is provided in the lower portion of the ram assembly 11, for example, when the striker 9 strikes a punch, the work is punched by the cooperation of the punch and the die. .

The ram lowering cam 7A has a shape that slows down the movement of the ram assembly 11 when punching a workpiece to reduce the processing noise, and is intended to perform noise reduction as much as possible.

The ram assembly 11 is provided with a vibration suppressing device 19 for moving the weight 17 having substantially the same weight as the ram assembly 11 in the opposite phase.
That is, as the vibration suppressing device 19, the first rack 21 is provided on both sides of the upper portion of the ram assembly 11, and the pinion 23 is meshed with the first rack 21.

Each pinion 23 is rotatably supported by a pinion shaft 25 attached to the frame 1. Moreover, a second rack 27 extending in the vertical direction is meshed with the outside of each pinion 23. The weight 17 is attached to the upper portion between the second racks 27.

With the above construction, when the ram assembly 11 moves up and down, the movement of the ram assembly 11 moves along the first rack 21 and the pinion 2.
3 and the second rack 27. As a result, the weight 17 is moved in the opposite phase to the movement of the ram assembly 11.

That is, when the ram assembly 11 descends as shown by the solid line in FIG. 1, the weight 17 rises as shown by the solid line. The ram assembly 11 is shown in FIG.
When the weight 17 rises as shown by the dotted line, the weight 17 descends as shown by the dotted line.

Therefore, since the weight 17 having substantially the same weight as the ram assembly 11 moves in the opposite phase,
The force generated by the abrupt movement of the ram assembly 11 is canceled by the weight 17, and the vibration force on the frame 1 is suppressed and reduced.

Thus, the vibration of the frame 1 is reduced, and the load on the components such as the servo motor, the switch, the sensor, etc., which compose the press machine 1 is also reduced, and the durability can be improved. In addition, since the vibration of the frame 1 is reduced, the excitation force on the ground is also weakened, so that vibration pollution can be improved. Furthermore, weight 1
The balance effect of 7 allows the ram assembly 11 to move smoothly.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in other modes by making appropriate changes.

[0028]

As will be understood from the above description of the embodiments, according to the inventions of claims 1 and 2, when the ram assembly is moved up and down, the vibration suppressing device works and the weight is in the opposite phase to the ram assembly. You can move it up and down with. As a result, the force generated by the abrupt movement of the ram assembly is canceled by the weight, and the vibration force on the frame can be suppressed, and the vibration can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a ram drive device of a press machine according to an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a front sectional view of a ram drive device of a conventional press machine.

[Explanation of symbols]

 1 frame 5 ram rotating shaft 7 double cam 7A ram lowering cam 7B ram raising cam 9 striker 11 ram assembly 13 first roller 15 second roller 17 weight 19 vibration suppressor 21 first rack 23 pinion 25 pinion shaft 27 second rack

Claims (2)

[Claims] 1. A ram assembly having a rotatable ram support shaft supported by a frame, a ram lowering cam and a ram raising cam being mounted on the ram rotary shaft, and a striker at the lower part. The first and second rollers rotatably supported on the ram assembly and rotatably mounted on the frame are brought into rolling contact with the ram lowering cam and the ram raising cam respectively, and the ram assembly is attached to the ram assembly. A ram driving device for a press machine, comprising a vibration suppressing device for moving weights of approximately the same weight in opposite phases. 2. The vibration suppressing device comprises: a pinion meshed with a first rack provided on both sides of the ram assembly; and a second pinion meshed with the pinion and extending vertically.
2. A ram drive device for a press machine according to claim 1, wherein the ram drive device comprises a rack and a weight mounted between the upper parts of the respective second racks.