JP2001009534A - Press driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press driving device which can be activated with a simple structure and a large output or a high speed. SOLUTION: This press driving device 17 of a press machine for performing a press processing to a work by co-working of a punch and a die is equipped with, a ram 15 which freely moves forward/backward for driving the punch, a first link bar 59 whose one end is rotatably connected with the ram 15, a crank block 51, whose base end is rotatably supported and to which the other end of the first link bar 59 is rotatably connected, a second link bar 47 which is rotatably connected with the end part of the crank block 51, and a forward/ backward driving device 35 for moving the other end of the second link bar 47 rotatably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press driving device for a press machine that presses a work by cooperation of a punch and a die.

[0002]

2. Description of the Related Art Conventionally, as a driving device such as a turret punch press, a rotary energy of a flywheel is transmitted to a crank mechanism through a clutch brake to move a ram up and down, and to process a work as a workpiece. And a hydraulic drive system that processes the workpiece by controlling the hydraulic pressure with cylinders and valves.In addition, the ram is directly moved up and down by the power of the servo motor without using the flywheel or clutch brake. 2. Description of the Related Art Servo motor driving systems for processing a work are known.

[0003]

By the way, among the conventional press driving devices, the stroke for the crank mechanism cannot be changed by the mechanical drive flywheel type. Also,
A coupling mechanism such as a clutch is required, and power for the coupling is required. Furthermore, since the rotation of the flywheel is transmitted by the clutch, a punching speed pattern of the press cannot be created.

[0004] In the hydraulic drive system, the punching speed of the press can be made variable, so that various punching speed patterns can be formed and the stroke can be varied. Becomes larger. In addition, heat is generated due to poor efficiency, and a cooling device such as an oil cooler is required, resulting in high cost. further,
There are many hydraulic piping parts, which requires assembling man-hours and increases costs.

In the servo motor drive system, both the punching speed and the stroke of the press can be made variable, and the structure is simple. However, since the work can be processed directly, a large power is required. In addition, a deceleration (power boosting) mechanism is required, the cost is high, and the inertia is large.

An object of the present invention is to provide a press drive device which has a simple structure and can operate at a large output or at a high speed.

[0007]

According to a first aspect of the present invention, there is provided a press driving apparatus for a press machine for performing a press working on a work by cooperation of a punch and a die. A retractable ram for driving the punch, a first link bar having one end rotatably connected to the ram, and a first link bar rotatably supported at a base end and the other end of the first link bar A crank block rotatably connected, a second link bar rotatably connected to an end of the crank block, and a second link bar;
An advancing / retracting drive device for rotatably advancing / retreating the other end of the link bar.

Therefore, when the advance / retreat drive device is driven, the crank block is rotated about the base end via the second link bar, and the ram is moved forward / backward via the first link bar. The punch moves up and down, for example, and the work is pressed by the cooperation of the punch and the die.

Thus, the press driving device can be manufactured with a simple structure, and a large output can be easily obtained.
Speeding up becomes possible.

According to a second aspect of the present invention, there is provided a press driving device according to the first aspect, wherein the forward / backward driving device includes a motor, a screw shaft connected to the motor, and the second link bar. And a connected nut member.

Therefore, when the motor is driven, the forward / backward drive device is constituted by the motor, the screw shaft connected to the motor, and the nut member connected to the second link bar. The screw shaft is rotated, and the second link bar is easily moved back and forth via the nut member.

Thus, there is no need for a complicated speed reduction mechanism, so that the structure is simplified and the cost is reduced. In addition, speeding up is achieved.

According to a third aspect of the present invention, there is provided a press driving apparatus according to the first or second aspect,
Near the bottom dead center of the ram, the connecting point between the base end of the crank block and the first link bar is adjusted so that the moving amount of the ram and the moving amount of the advance / retreat drive device are simply proportional to the lever ratio of the crank block. The connecting line is set so as to be perpendicular to the center line of the ram near the bottom dead center of the ram.

Therefore, since the crank block is a bell crank, the driving force of the advance / retreat driving device is converted by the lever ratio according to the principle of leverage and transmitted to the ram via the first link bar. As a result, a large output can be easily obtained, and the position can be easily set.

According to a fourth aspect of the present invention, there is provided the press driving device according to the first, second or third aspect, wherein the connecting position between the second link bar and the crank block is positioned at an arbitrary position by an actuator. The feature is that it is possible.

Therefore, by operating the actuator, the connection position between the second link bar and the crank block is set at an arbitrary position. As a result, the ram is driven at a high output or at a high speed.

According to a fifth aspect of the present invention, there is provided a press driving device according to the first, second, third, or fourth aspect, further comprising position setting means for setting the position of the forward / backward driving device. It is assumed that.

Therefore, since the position setting means for setting the position of the advance / retreat driving device is provided, the lever setting is taken in by the position setting means, and the change of the ram position is recognized.

According to a sixth aspect of the present invention, there is provided a press driving apparatus according to the first, second, third, fourth, or fifth aspect, wherein the press machine is a punch press machine. .

Therefore, when this press driving device is provided in a punch press machine, even if the work is a thick plate, the work is easily performed, and if the work is a thin plate, the work is performed at a high speed, which is very effective.

[0021]

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

Referring to FIGS. 3 and 4, a turret punch press 1 of, for example, a punch press as a press machine includes a portal frame 3, and the portal frame 3 is connected to a lower frame 5. , An upper frame 7 and left and right side frames 9 connecting the lower frame 5 and the upper frame 7.

A rotatable lower turret 11 is supported on the lower frame 5, and a rotatable upper turret 13 is supported on the upper frame 7.
Moreover, a plurality of dies D are mounted on the circumference of the lower turret 11 at appropriate intervals, and a plurality of punches P are mounted on the circumference of the upper turret 13 at appropriate intervals. .

The lower turret 11 and the upper turret 13
4, the position of the die D and the punch P mounted on the right end in FIG. The upper frame 7 above the punching position K
Is provided with a vertically movable ram 15. Moreover,
A press drive device 17 for driving the ram 15 is provided on the upper frame 7.

On the right side of the lower frame 5, a work movement positioning device 19 is provided. That is, a fixed center table 21 is provided on the lower frame 5 on the right side of the front side of the punching position K in FIGS.
1, FIG. 3 and FIG.
(In the left-right direction).

A carriage base 25 extending in the X-axis direction (vertical direction in FIG. 4) across the center table 21 is integrally provided on the side table 23. The carriage 27 is provided on the carriage base 25 so as to be movable in the X-axis direction. Moreover, the carriage 27 is provided with a plurality of work clamps 29. In addition, a control device 31 for controlling the turret punch press 1 is provided on an upper portion of a frame 33 erected on the left side in FIG.

With the above-described structure, the carriage 27 is moved in the X-axis direction while the work W is clamped by the work clamp 29, and the carriage base 25 is moved in the Y-axis direction. It is moved to the position of the punching processing position K and positioned. By driving the press drive device 17 in this state, the ram 15 moves up and down, and the work W is punched by the cooperation of the punch P and the die D.

The press driving device 17 will be described in more detail. Referring to FIG.
Is provided with a forward / backward drive device 35. As the forward / backward drive device 35, a motor 37 such as a servo motor or an inverter motor is provided.
Is provided with a position detector 39 such as an encoder. A ball screw 43 as a feed screw is connected to the output shaft of the motor 37 via a coupling 41. A nut member 45 is screwed into the ball screw 43. Further, one end (the left end in FIG. 1) of the second link bar 47 is rotatably connected to the nut member 45 by a pin 49.

At the other end (right end in FIG. 1) of the second link bar 47, the upper end of the crank block 51 is
3 and are rotatably connected. Crank block 51
The left end (the lower left end in FIG. 1) of the base end is rotatably connected to a bracket 55 attached to the upper frame 7 by a pin 57. A first link bar 5 is provided at the right end (lower right end in FIG. 1) of the base of the crank block 51.
The upper end, which is the other end of 9, is rotatably connected by a pin 61. A lower end, which is one end of the first link bar 59, is connected to an upper end of the ram 15 by a pin 63. Moreover, the control device 31 is provided with a position setting means 63.

With the above configuration, when the motor 37 is driven, the second link bar 47 is moved in the left-right direction in FIG. As a result, the crank block 51
1 is moved vertically in FIG. 1 with the pin 57 as a fulcrum, so that the ram 15 is moved vertically via the first link bar 59.

If a servo motor is used as the motor 37, the stroke and speed can be controlled arbitrarily.
Higher speed and lower noise can be achieved.

Since the crank block 51 is a bell crank, the forward / backward driving device 3 is driven by the principle of leverage.
5 is transmitted by the lever ratio to the ram 15 via the first link bar 59, so that a large output can be easily obtained and the speed can be increased.
For example, high output can be performed when processing a thick plate, and high speed can be performed when processing a thin plate with a small pressing force.

Further, since the forward / backward drive device 35 is composed of the motor 37, the ball screw 43 and the nut member 45, no complicated speed reduction mechanism is required, the structure is simplified, and the number of device units can be reduced. When the ball screw 43 is used, the motor shaft diameter and the screw shaft diameter can be made equal, and the inertia can be increased. Further, by providing a speed reduction (power boosting) mechanism on the driven side of the ball screw 43, the inertia can be made smaller than when the ball screw 43 is provided on the driving side. Therefore, the motor 37
Can be reduced in size or the speed of the device can be increased.

As shown in FIG. 2, a bracket 65 is attached to the upper end of the crank block 51. The bracket 65 is provided with a hydraulic cylinder 67, and the tip of a piston rod 69 mounted on the hydraulic cylinder 67 is connected to the pin 53. Moreover, the pin 53 is mounted in a vertically long hole 71 formed in the crank block 51 so as to be able to move in the vertical direction.

When the fluid pressure cylinder 67 is actuated, the piston rod 69 is moved up and down.
Will be adjusted vertically. Note that, instead of the fluid pressure cylinder 67, a motor or the like may be used as an actuator. Moreover, it can be moved steplessly or in multiple steps.

Therefore, the crank block 51 is
As described above, since the bell crank is used, the position of the connecting portion of the second link bar 47 can be appropriately changed, and the ram 15 can be driven with high output or high speed. At the same time as this change, the position setting means 63 can take in the leverage change and recognize the change in the position of the ram 15. The position setting means 63 comprises a servo or inverter motor control device.

The line connecting the base end of the crank block 51 and the first link bar 59 is the center line of the ram 15 and the ram 1
5, the moving amount (y) of the ram 15 and the movement of the advance / retreat driving device 35 near the bottom dead center of the ram 15 (bottom dead center 0 to 10 mm) are set. Travel (x)
It is simply proportional (y = x / a) to the leverage ratio (1: a). Therefore, the position can be easily set.

The present invention is not limited to the above-described embodiment of the present invention, but can be embodied in other modes by making appropriate changes. In the present embodiment, the feed screw of the advance / retreat driving device 35 may be not a screw but a nut. Further, the ball screw and the rotor of the motor may be integrated. This eliminates the need for coupling, thereby reducing inertia.

[0039]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, when the forward / backward drive device is driven, the crank block is mounted via the second link bar. By rotating about the end as a fulcrum and further moving the ram forward and backward via the first link bar,
The punch moves up and down, for example, and the work can be pressed by the cooperation of the punch and the die.

Thus, the press drive device can be manufactured with a simple structure, and a large output can be easily obtained, and the speed can be increased.

According to the second aspect of the present invention, the forward / backward drive device is constituted by the motor, the screw shaft connected to the motor, and the nut member connected to the second link bar. When the motor is driven, the screw shaft is rotated, and the second link bar can be easily advanced and retracted via the nut member.

Thus, a complicated speed reduction mechanism is not required, so that the structure can be simplified and the cost can be reduced. Moreover, the speed can be increased.

According to the third aspect of the present invention, since the crank block is a bell crank, the driving force of the advance / retreat driving device is converted by the lever ratio by the principle of leverage and transmitted to the ram via the first link bar. Is done. As a result, a large output can be easily obtained, and the position can be easily set.

According to the fourth aspect of the present invention, the coupling position between the second link bar and the crank block is positioned at an arbitrary position by operating the actuator.
As a result, the ram can be driven at a high output or at a high speed.

According to the fifth aspect of the present invention, since the position setting means for setting the position of the forward / backward drive device is provided, the position setting means can take in the lever ratio and recognize the change of the ram position. it can.

According to the sixth aspect of the present invention, when this press driving device is provided in a punch press machine, a work can be easily processed even when the work is a thick plate, and when the work is a thin plate, the work can be performed at a high speed. Is very effective.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a press driving device according to the present invention.

FIG. 2 is a diagram illustrating an example of an adjusting device for adjusting a tip position of a second link bar.

FIG. 3 is a side view of a turret punch press showing an example of the press machine of the present invention.

FIG. 4 is a plan view of FIG.

[Explanation of symbols]

 Reference Signs List 1 turret punch press (press machine) 17 press drive device 31 control device 35 advance / retreat drive device 37 motor 39 position detector 43 ball screw (feed screw) 45 nut member 47 second link bar 49 pin 51 crank block 53 pin 57 pin 59th 1 link bar 61 pin 63 position setting means 67 fluid pressure cylinder

Claims (6)

[Claims] 1. A press driving device of a press machine for performing a press working on a work by cooperation of a punch and a die,
A retractable ram for driving the punch, a first link bar having one end rotatably connected to the ram, and a first link bar rotatably supported at a base end and the other end of the first link bar A crank block rotatably connected to the crank block, and a second crank block rotatably connected to an end of the crank block.
A press drive device comprising: a link bar; and an advance / retreat drive device for rotatably moving and retracting the other end of the second link bar. 2. The reciprocating drive device comprises a motor, a screw shaft connected to the motor, and a nut member connected to the second link bar. The press drive as described. 3. The base end of the crank block and the first link so that the ram movement amount and the movement amount of the advance / retreat driving device near the bottom dead center of the ram are simply proportional to the lever ratio of the crank block. 3. The press drive device according to claim 1, wherein a line connecting the connection points of the bars is installed so as to be perpendicular to a center line of the ram near the bottom dead center of the ram. 4. The press drive device according to claim 1, wherein a connection position between the second link bar and the crank block can be positioned at an arbitrary position by an actuator. 5. The apparatus according to claim 1, further comprising a position setting means for setting a position of said forward / backward drive device.
5. The press driving device according to 3 or 4. 6. The press driving device according to claim 1, wherein said press machine is a punch press machine.