JPH1158077A - Variable stroke toggle press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a toggle press, in which a torque capacity curve does not change even if the stroke of a ram is varied, and number of the parts can be reduced, by providing a servo motor device connected with a rotary shaft and driven in the normal rotation and the reverse rotation while using a top dead center as the base point in the rotary shaft. SOLUTION: At the time of working the servo motor 34, this rotation driving force is transmitted to the rotary shaft 20 through a speed reducer 33 and a first link 23 is simultaneously rotated. Since the ram 30 is attached pivotally through a second link 28 in the first link 23, the ram 30 is slid downward through a guide of a frame l with the rotation of the first link 23. Since the servo motor 34 is worked so as to rotate in the interval between a position corresponding to a bottom dead center of the ram 30 to the rotary shaft 20 and a position before working, the ram 30 becomes high output at near the bottom dead center of the stroke amonut. Therefore, a die fitted to the ram 30 executes the pressing to a material to be worked at near the bottom dead center of the stroke amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable stroke toggle press capable of easily changing a stroke length.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a conventional toggle press comprises a frame 1, a ram 2 provided on one side of the frame 1 so as to be vertically movable, and an upper portion of the frame 1. A rotating shaft 4 rotatably supported via bearings 3 and 3. Below the ram 3 of the frame 1, a fixed tool mounting portion 5 is provided so as to face the ram 3.

On the other hand, a crankpin 6 is provided at one end of the rotary shaft 4, and one end of a connection 7 is mounted on the crankpin 6. This connection 7
Is connected to one end of a first link 9 via a pin 8. The other end of the first link is pivotally connected to the frame 1 via a pin 10. One end of a second link 11 is pivotally connected to a pin 8 provided at the other end of the connection 7. The other end of the second link is pivotally connected to the ram 2 via a pin 12.

On the other hand, the other end of the rotary shaft 4 is freely rotatable with respect to the clutch 13 and the rotary shaft 4 in the axial direction via key means.
Are provided respectively. The flywheel 14 has
The rotation of the electric motor 15 provided on the frame 1 is transmitted via a V-belt.

When the electric motor 15 operates,
The torque of the electric motor 15 is transmitted to the flywheel 14 via the V-belt, and the flywheel 14 freely rotates around the rotating shaft 4. When the clutch 13 provided on the rotating shaft 4 is moved in the direction of the flywheel 14, the clutch 13 comes into contact with the rotating flywheel 14, and the rotational force of the flywheel 14 is transmitted to the rotating shaft 4 via key means.

When the rotational force of the flywheel 14 is transmitted to the rotary shaft 4 by the clutch 13, the rotary shaft 4 rotates, and the rotation of the rotary shaft 4 causes the crankpin 6 to rotate eccentrically, and is mounted on the crankpin 6. The connection 7 moves in the horizontal direction by the amount of eccentricity of the crank pin 6 and the ram 2 provided on the frame 1 via the second link 11.
Move down. Connection 7 and first link 9 and second
Since the link 11 constitutes a toggle mechanism, the frame 1
The ram 2 provided in the first stage performs a pressurizing action once every rotation of the rotary shaft 4.

[0007]

The above-mentioned toggle press is a system in which a ram is moved up and down by moving a connection horizontally with a crankpin. The stroke of the ram can be varied by rotating a shaft, a connection, and a link. This is done by replacing any part. However, replacing any part of the rotating shaft, connection, or link will change the torque capacity curve set for the toggle press, and the toggle press will not be able to exhibit the desired pressing force. Become.

In the toggle press, a large space needs to be provided in the frame in order to set a large stroke of the ram. However, providing a large space in the frame deteriorates the rigidity of the frame. There is a problem.

The present invention has been made in view of the above points, and an object of the present invention is to provide a variable stroke toggle press capable of reducing the number of parts without changing the torque capacity curve even when the ram stroke is varied. Aim.

[0010]

The variable stroke toggle press according to the present invention has a first link fixed to a rotating shaft rotatably supported on a frame, and a second link pivotally connected to the first link. The rotating shaft is connected to the servo motor device by pivoting on the ram supported vertically up and down on the frame, and the servo motor device is rotated forward and backward, so that the rotating shaft rotates forward and backward from the bottom dead center. By changing the stop position of the rotary shaft, the stroke can be easily changed without changing the position of the bottom dead center.

[0011]

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

In FIGS. 1 and 2, the same members as those in FIGS. 3 and 4 are denoted by the same reference numerals.

In FIG. 1, reference numeral 20 denotes a rotating shaft. The rotating shaft 20 is rotatably supported by the frame 1 via bearings 21 and 21. Rotating shaft 2
0 is provided with a small-diameter shaft 22 at one end thereof.
2 is provided with a first link 23.

As shown in FIG. 2, the first link 23 has a circular portion 24 and an arm portion 25 extending radially outward from the circular portion 24. The first link 23 is attached to the rotating shaft 20 by passing an opening provided in the disk portion 24 through the shaft portion 22, and a plurality of bolts 26 are passed through the opening provided in the periphery of the disk portion 24, and the end surface of the rotating shaft 20 is connected to the first link 23. Is fixed to the rotating shaft 20 by being screwed into a screw hole provided in the rotary shaft 20.

The first link 23 has an arm 25 pivotally connected to one end of a second link 28 via a pin 27. The other end of the second link 28 is pivotally connected to a ram 30 supported on the frame 1 via pins 29 so as to be vertically movable.

That is, the first link 23 and the second link 2
Numerals 8 are connected so as to form a dogleg shape, rotatably support the other end of the first link 23, and slidably support the other end of the second link 28, thereby forming a toggle joint mechanism. Is configured.

The ram 30 has a ram main body 31 and an output adjusting device 32 arranged inside the ram main body 31. The output adjusting device 32 includes a plurality of laminated disc springs (FIG.
6).

As shown in FIG. 1, the other end of the rotary shaft 20 is connected to a servomotor 34 via a speed reducer 33. The rotation of the servomotor 34 is controlled by control means (not shown) so as to rotate forward and reverse. The angle position of the rotating shaft 20, that is, the height position of the first link 23, is visually recognized by an operator by the hands 35. By determining the initial angular position of the rotary shaft 20, the stroke amount of the ram 30 is determined.

Next, the operation will be described. Servo motor 3
The rotation of the rotary shaft 4 is controlled by control means so as to rotate the rotary shaft 20 forward and backward from the top dead center. Before the operation, the first link 23 fixed to the rotating shaft 20 is at the position shown in FIG.

Then, when a switch (not shown) is turned on and the servo motor 34 is operated, the rotational driving force of the servo motor 34 is transmitted to the rotary shaft 20 via the speed reducer 33, and the rotary shaft 20 is moved by the arrow A in FIG. In the direction of. Since the first link 23 is fixed to the rotating shaft 20, the first link 23 also rotates at the same time. Since the ram 30 is pivotally connected to the first link 23 via the second link 28, the rotation of the first link 23 causes the ram 30 to rotate.
Slide downward through the guide of the frame.

The servo motor 34 operates so that the rotary shaft 20 rotates between a position corresponding to the bottom dead center of the ram and a position before the operation.
Becomes high near the bottom dead center of the stroke amount. Therefore, a mold (not shown) mounted on the ram 30 presses the workpiece near the bottom dead center of the stroke amount.

The provision of the output adjusting device 32 on the ram 30 makes it possible to prevent the frame and the mold from being damaged even when an output exceeding a predetermined output occurs during the press working.

Further, when changing the stroke length of the ram 30, the position of the bottom dead center is kept as it is,
You can do this by changing the stop position. This is performed by controlling the servomotor 34.

[0024]

As described above, according to the present invention, since the link is directly connected to the rotary shaft, the conventional toggle press connection and crankshaft are not required, and the number of parts can be reduced. Further, since the stroke can be changed by changing the stop position of the rotary shaft, the torque capacity curve does not change with the change of the stroke, and further, by moving the ram over the set stroke, The press die setting time is shortened, and it becomes easy to find the cause of the abnormality when the abnormality of the die occurs.

[Brief description of the drawings]

FIG. 1 is a side view of a variable stroke toggle press according to the present invention.

FIG. 2 is a front view of a variable stroke toggle press according to the present invention.

FIG. 3 is a side view of a conventional toggle press.

FIG. 4 is a front view of a conventional toggle press.

[Explanation of symbols]

 1 Frame 20 Rotary Shaft 22 Small Diameter Shaft 23 First Link 28 Second Link 30 Ram 32 Output Adjuster 34 Servo Motor

Claims (3)

[Claims] 1. A frame, a rotating shaft rotatably supported by the frame, a ram supported vertically by the frame, and a first ram fixed to the rotating shaft.
A link, a second link having one end pivotally connected to the first link and the other end pivotally connected to the ram, and a servomotor device connected to the rotation shaft for rotating the rotation shaft forward and reverse around the top dead center. Variable stroke toggle press. 2. The variable stroke toggle press according to claim 1, wherein an output adjusting device is provided on the ram. 3. The toggle press according to claim 2, wherein the output adjusting device has a disc spring.