JP4700775B2 - Press drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press drive device of a press machine that presses a workpiece by cooperation of a punch and a die.
[0002]
[Prior art]
As a conventional drive device such as a turret punch press, a mechanically driven fly that transmits the rotational energy of a flywheel to a crank mechanism via a clutch brake to raise and lower the ram and process a workpiece as a workpiece. Wheel type and hydraulic drive system that processes the workpiece by controlling the hydraulic pressure with cylinders and valves, and further, the servo motor power moves the ram directly up and down without using the flywheel or clutch brake and processes the workpiece A servo motor drive system is known.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional press drive device, the stroke for the crank mechanism cannot be varied in the mechanical drive flywheel type. Further, a coupling mechanism such as a clutch is required, and power for the coupling is necessary. Furthermore, since the rotation of the flywheel is transmitted by a clutch, it is not possible to create a press punching speed pattern.
[0004]
With the hydraulic drive system, the punching speed of the press can be made variable, so various punching speed patterns can be created and the stroke can be changed, but the efficiency is poor due to loss such as leakage at the valve, and the power increases. . Moreover, since it is inefficient, it generates heat, and a cooling device such as an oil cooler is required, resulting in high costs. In addition, there are many hydraulic piping parts, which takes assembling steps and increases costs.
[0005]
In the servo motor drive system, both the punching speed and stroke of the press can be made variable, and the structure is simple, but since the workpiece can be processed directly, it requires a large amount of power, so the speed ( A (boost) mechanism is required, its cost is high, and inertia is high, which hinders speeding up.
[0006]
An object of the present invention is to provide a press drive device that has a simple structure and can be operated with a large output or high speed.
[0007]
[Means for Solving the Problems]
The present invention has been made in view of the conventional problems as described above, and is a press drive device in a press machine provided with the ram so as to be movable up and down, and an upper portion of the press machine at a position above the ram (15). A first link bar having a lower end connected to the ram (15) via a pin (63) to a crank block (51) rotatably connected to the frame (7) via a pin (57). 59) is connected to the lower part of the crank block (51) via a pin (61), and a ball screw (43) rotated by a motor (37) is provided horizontally, and this ball screw (43) The other end of the second link bar (47) is rotatably connected to the nut member (45) screwed to the nut member (45) via a pin (49). The crank block (51) is connected to the first link bar (59), the second link bar (47) and the upper frame (7). The crank block (51) includes a right triangle connecting the pins (61, 53, 57) connected to the crank block (51) , and the top side of the crank block (51) having the right triangle shape is connected to the upper frame (7). The pin (57) connected to the crank block (51) and the pin (57) connected to the first link bar (59) are substantially the same height when the ram (15) is near bottom dead center. located of, when said pin second link bar (47) coupled said to crank block (51) (53), said ram (15) is near the bottom dead center, the crank block (51) The pin (57) connected to the upper frame (7) is positioned substantially vertically above the pin (57), and the crank block (51) is connected to the frame (7) from the pin (57). The dimension b to the pin (53) connecting the second link bar (47) to the crank block (51) is from the pin (57) connecting the crank block (51) to the frame (7). The crank block (51) is larger than the dimension a up to the pin (61) connecting the first link bar (59) to the crank block (51) and in the vicinity of the bottom dead center of the ram (15). ) and the pin that is connected to the upper frame (7) to (57), and said pin coupled (61) to said first link bar (59) the crank block (51) The connecting line is arranged so as to be perpendicular to the center line of the ram (15).
[0008]
In the press drive device, the pin (53) that connects the second link bar (47) and the crank block (51) is stepless or multi-stepped in the vertical direction with respect to the crank block (51). It is possible to move in stages.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0022]
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 includes a lower frame 5 and an upper frame. 7 and left and right side frames 9 that connect the lower frame 5 and the upper frame 7 to each other.
[0023]
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. In addition, 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. .
[0024]
Among the plurality of dies D and punches P respectively mounted on the lower turret 11 and the upper turret 13, 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 ram 15 that can move up and down. In addition, a press drive device 17 for driving the ram 15 is provided on the upper frame 7.
[0025]
A work movement positioning device 19 is provided on the right side of the lower frame 5. That is, a fixed center table 21 is provided on the lower frame 5 on the right side in FIGS. 3 and 4 at the front side of the punching processing position K. A side table 23 that is movable in the Y-axis direction (left and right in FIGS. 3 and 4) is provided.
[0026]
On the side table 23, a carriage base 25 extending in the X-axis direction (vertical direction in FIG. 4) straddling the center table 21 is integrally provided. A carriage 27 that is movable in the X-axis direction is provided on the carriage base 25. Moreover, the carriage 27 is provided with a plurality of work clamps 29. 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.
[0027]
With the configuration described above, the carriage 27 is moved in the X-axis direction while the workpiece W is clamped by the workpiece clamp 29, and the carriage base 25 is moved in the Y-axis direction, whereby the desired position of the workpiece W is punched. Move and position to position K. By driving the press drive device 17 in this state, the ram 15 moves up and down, and the workpiece W is punched by the cooperation of the punch P and the die D.
[0028]
The press drive device 17 will be described in more detail. Referring also to FIG. 1, the upper frame 7 is provided with an advance / retreat drive device 35. The advance / retreat drive 35 is provided with a motor 37 such as a servo motor or an inverter motor, and the motor 37 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 onto the ball screw 43. Moreover, one end (left end in FIG. 1) of the second link bar 47 is rotatably connected to the nut member 45 by a pin 49.
[0029]
The other end of the second link bar 47 (the right end in FIG. 1) is connected to the upper end of the crank block 51 by a pin 53 so as to be rotatable. A left portion (left lower end in FIG. 1) of the base end of the crank block 51 is rotatably connected to a bracket 55 attached to the upper frame 7 by a pin 57. The upper end portion, which is the other end of the first link bar 59, is connected to the right end portion (right lower end in FIG. 1) of the base of the crank block 51 by a pin 61 so as to be rotatable. A lower end portion which is one end of the first link bar 59 is connected to an upper end of the ram 15 by a pin 63. In addition, the control device 31 is provided with position setting means 63.
[0030]
With the above configuration, when the motor 37 is driven, the ball screw 43 is rotated, so that the second link bar 47 is moved in the left-right direction in FIG. As a result, the crank block 51 is moved in the vertical direction in FIG. 1 with the pin 57 as a fulcrum, so that the ram 15 is moved in the vertical direction via the first link bar 59.
[0031]
When a servo motor is used as the motor 37, the stroke and speed can be arbitrarily controlled, and speeding up and noise reduction can be achieved.
[0032]
Since the crank block 51 is a bell crank, the driving force of the advancing / retreating drive device 35 is converted into the lever ratio by the lever principle and transmitted to the ram 15 via the first link bar 59. The output can be obtained and the speed can be increased. For example, high-power processing can be performed when processing a thick plate, and high-speed processing can be performed when processing a thin plate with a small pressure.
[0033]
Further, since the advance / retreat drive device 35 is constituted by the motor 37, the ball screw 43, and the nut member 45, a complicated reduction mechanism is not required, and the structure can be simplified and the number of device units can be reduced. Further, 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 deceleration (boost) mechanism on the driven side of the ball screw 43, the inertia can be made smaller than that provided on the driving side. Therefore, the motor 37 can be downsized or the speed of the apparatus can be increased.
[0034]
As shown in FIG. 2, a bracket 65 is attached to the upper end portion of the crank block 51. The bracket 65 is provided with a fluid pressure cylinder 67, and the tip of a piston rod 69 attached to the fluid pressure cylinder 67 is connected to the pin 53. Moreover, the pin 53 is mounted in a vertically elongated hole 71 formed in the crank block 51 so as to be movable in the vertical direction.
[0035]
With the above configuration, when the fluid pressure cylinder 67 is operated, the piston rod 69 is moved up and down, so that the position of the second link bar 47 is adjusted in the vertical direction with respect to the crank block 51. Instead of the fluid pressure cylinder 67, it may also be used such as motor accession Chue over data. Moreover, it can be moved steplessly or in multiple steps.
[0036]
Therefore, since the crank block 51 portion is a bell crank as described above, the position of the connecting portion of the second link bar 47 can be appropriately changed, and the ram 15 can be driven at high output or high speed. it can. Simultaneously with this change, the position setting means 63 can take in the lever ratio change and recognize the change in the position of the ram 15. The position setting means 63 is a servo or inverter motor control device.
[0037]
The line connecting the pin 57 connecting the crank block 51 to the upper frame 7 and the pin 61 connecting the first link bar 59 to the crank block 51 is in the vicinity of the center line of the ram 15 and the bottom dead center of the ram 15. since it is installed such that a right angle at, near bottom dead center of the ram 15 (the bottom dead center 0 to 10 mm), the amount of movement of the ram 15 (y) and the amount of movement of the advancing drive device 35 (x) is It is simply proportional (y = x / a) to the lever ratio (1: a). Therefore, position setting can be performed easily.
[0038]
In addition, this invention is not limited to embodiment of invention mentioned above, It can implement in another aspect by making an appropriate change. In the present embodiment, the feed screw of the advance / retreat drive device 35 may be a nut rotation instead of a screw rotation. Further, the ball screw and the rotor of the motor may be integrated. Thereby, since a coupling becomes unnecessary, an inertia can be reduced.
[0039]
【The invention's effect】
As will be understood from the description of the embodiments of the above such as, according to the present invention, when by rotating the ball screw reciprocates nut member in the horizontal direction, the crank via a second link bar block Kugakai When the ram is moved up and down via the first link bar, the punch moves up and down, for example, and the workpiece can be pressed by the cooperation of the punch and the die.
[0040]
Thus, the press drive device can be manufactured with a simple structure, and a large output can be easily obtained .
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining a press drive device of 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.
4 is a plan view in FIG. 3. FIG.
[Explanation of symbols]
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 59 First link bar 61 Pin 63 Position setting means 67 Fluid pressure cylinder

Claims (2)

A press drive device in a press machine provided with a ram so as to be movable up and down, and is rotatably connected to an upper frame (7) of the press machine via a pin (57) at a position above the ram (15). An upper end portion of a first link bar (59) connected to the ram (15) via a pin (63) is connected to the crank block (51) via a pin (61). The ball screw (43) rotated by the motor (37) is provided horizontally, and the nut member (45) movably screwed to the ball screw (43) is provided via a pin (49). The other end of the second link bar (47) having one end rotatably connected thereto is rotatably connected to the upper portion of the crank block (51) via a pin (53). The hook (51) includes the first link bar (59), the second link bar (47), the upper frame (7), and the pins (61, 53, 57) connecting the crank block (51). ) has a shape that encompasses the right triangle connecting the said pin (57) and said first link bar the top side coupled to said upper frame (7) of the right-angled triangular crank blocks (51) (59) The pin (61) connected to the crank block (51) is substantially at the same height when the ram (15) is near bottom dead center , and the second link bar (47) is connected to the crank block (51). the pin linked to) (53), when said ram (15) is near the bottom dead center, said substantially on the vertical of the pin crank block (51) coupled to said upper frame (7) (57) A configuration is located in the position, and was ligated the said from the pin crank block (51) coupled to said frame (7) (57) a second link bar (47) to said crank blocks (51) The dimension b to the pin (53) is that the first link bar (59) is connected to the crank block (51) from the pin (57) connecting the crank block (51) to the frame (7). The pin (57) which is larger than the dimension a up to the pin (61) and which connects the crank block (51) to the upper frame (7) in the vicinity of the bottom dead center of the ram (15); said first link bar (59) a line connecting the said pin (61) which is connected to a crank block (51) is installed in such that the center line at right angles with the ram (15) There is a press drive device.   2. The press drive device according to claim 1, wherein the pin (53) connecting the second link bar (47) and the crank block (51) is not vertically arranged with respect to the crank block (51). A press drive device characterized by being movable in stages or in multiple stages.

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