JPH11245096A - Slider link press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a small horizontal force acted on a slide even when the pressing force of press processing is acted from a high position of a slide stroke, and enable high precision press processing by applying a fast back motion, wherein a lowering stroke is slow and a rising stroke is fast, so as to enable the fine adjustment of the bottom dead center of the slide with good productivity. SOLUTION: According to the device, a spherical bearing 5A, which is fit to a crank pin 4A a crank shaft 4 and swung up/downwards at the swing link 5 bottom part while a swing supporting point shaft 8 is a center, and a ball bearing 3A installed 3A installed at the point on a slide 3 top face which moves up/down below the crank shaft 4 are connected to a connecting link 9 having ball parts 9A, 9B at both ends. The press also comprises a bottom dead center adjusting device 10 for adjusting the bottom dead center of a slide 3 by constantly moving a swing supporting point pin 8 up/downwards.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slider link press in which a slide is moved up and down by oscillating a swing link. In the field of press working, cold forging such as sizing and precision extrusion is mainly used. This is effective when processing is desired to be performed with higher precision.

[0002]

2. Description of the Related Art When cold forging is performed, a crank press, a knuckle press or the like is selected and used depending on a product to be processed. As a knuckle press, for example, a connecting rod connected to a slide as in Japanese Patent Publication No. 51-19189 is connected to one arm of a bell crank,
There is one in which a slider that is loosely fitted to a crankpin of a crankshaft is slidably fitted into a long hole of the other arm. Further, as a crank press, for example, as disclosed in JP-A-55-48500, there is a press in which a metal loosely fitted to a crank pin is slidably fitted in a slide groove.

[0003]

Among the cold forging processes in the prior art described above, sizing, extrusion, and the like are relatively far from the bottom dead center of the stroke in which the slide moves from the top dead center to the bottom dead center. Requires pressing force from a high position. However, in the above press machines, when a pressing force acts from a high position, the pressing force acts at a large angle with respect to the vertical direction, and the component force for pushing the slide in the horizontal direction is large,
There is a disadvantage that a high precision pressed product cannot be obtained.
In addition, since the bottom dead center position of the slide is set by the die height adjustment device configured between the connecting rod and the slide, it is difficult to adjust the bottom dead center position of the minute slide, and a stable and high precision press is performed. There is a disadvantage that a processed product cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and has a structure in which even if a pressing force of press working is applied from a position where a slide stroke is high, a lateral force acting on a slide is small, and It is an object of the present invention to provide a slider link press which has good productivity as a slightly fast-returning motion with a slow stroke and a fast rising stroke, can correct a bottom dead center position of a minute slide, and can perform a more accurate press working.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention converts a rotational output of a rotationally driven crankshaft into a reciprocating motion via an oscillating link, and raises and lowers a slide. In a link press, a crankshaft provided rotatably in the horizontal direction on a frame above the slide, and a near-horizontal direction orthogonal to the crankshaft are provided at a position parallel to and away from the crankshaft. A rocking link that reciprocates around a rocking fulcrum pin and a groove that is rotatably fitted to the crankpin of the crankshaft and that is linear in the longitudinal direction of the rocking link or an arc-shaped groove that has a center at the top. A slide drive device is constituted by a slidably provided slider, and a connection link which is slidably connected at both ends to a lower surface portion of the swing link and an upper surface portion of the slide so as to swing vertically. Together, in conjunction with the swing fulcrum pin,
The apparatus is provided with a bottom dead center correction device for sliding the fulcrum pin vertically.

In the above-described slider link press, the bottom dead center correction device for the slide is fixedly mounted on the frame above the swing fulcrum pin, a worm wheel provided inside the case, and engaged with the worm wheel. The worm shaft includes a worm shaft driven by a motor, and a screw shaft provided at one end portion of which is screwed to a worm wheel, and the other end portion is connected to a swing fulcrum pin.

In the above-described slider link press, the bottom dead center correcting device for the slide is mounted on a frame directly above the swing fulcrum pin or on a frame via a bracket, directly with the motor, or with a pulley. It is composed of a screw shaft connected via a belt, and a female screw member for screwing a female screw portion provided at one end to the screw shaft and connecting the other end to the pivot pin.

Further, in the above-mentioned slider link press, the bottom dead center correcting device for the slide is mounted on the frame directly above the swing fulcrum pin or on the frame via a bracket, and a rod of the servo cylinder is provided. It is configured to be connected to the swing fulcrum pin directly or via an intermediate member.

[0009]

[Function] Since the swing fulcrum pin of the swing link is sufficiently away from the crankshaft, even if the swing link is swung by being driven by the crankpin, the center position of the spherical bearing of the swing link is the point of the slide. Since the amount of fluctuation in the longitudinal direction of the swing link from the center is extremely small, it is possible to hold the connecting link almost vertically, and to quantitatively position the swing fulcrum pin vertically with the slide bottom dead center correction device. When adjusted, the bottom dead center of the slide also moves up and down in proportion to the adjustment amount, and the bottom dead center position of the slide is corrected. In addition, since the connecting link is always held in the vertical direction, the pressing force acting on the slide is always directed in the vertical direction, and hardly generates a thrust force for pressing the slide in the horizontal direction.

[0010]

1 to 6 show an embodiment of a slider link press according to the present invention. 1 to 4 show a first embodiment of the present invention. As shown in FIGS. 1 and 2, a slide 3 is provided on a frame 2 of a slider link press 1 so as to be vertically movable. A crankshaft 4 is provided on the frame 2 above the slide 3 so as to be rotatable in the horizontal direction of the slider link press 1 in the left-right direction.
A crankshaft 4 corresponding to a point on the slide 3 is provided with a crankpin 4A. A crank pin 4A is inserted into a longitudinal linear groove 6 of an oscillating link 5 extending substantially horizontally in a direction perpendicular to the crank shaft 4. The swing link 5 is parallel to the crankshaft 4 and is rotatably held by a swing fulcrum pin 8 rearward at a predetermined distance from the crankshaft 4.

The slider 7 has a structure in which the crank pin 4A is divided into upper and lower parts, and upper and lower divided sliders 7A, 7B
Are longitudinal guides of the upper surface and the lower surface of the groove 6, respectively.
Alternatively, the crank pin 4 is slidably held in the guide groove.
The slider 7 is integrally formed by fitting A into the center hole.

Spherical bearings 5A and 3A are provided on the lower surface of the oscillating link 5 and the center of the point of the slide 3 so that the centers thereof are aligned in the vertical direction. Is provided with a connecting link 9 which is swingably connected to both. When the swing link 5 swings up and down with the rotation of the crankshaft 4, the center of the spherical bearing 5A slightly shifts in the front-rear direction, and the connecting link 9 tilts back and forth by a small angle.
The connection is held by the spherical bearings 5A, 3A.

The number of points on the slide 3 is 2 shown in FIG.
Although there may be a group other than the base, when a plurality of bases are provided, the same number of connecting links as the number of points may be provided, and the swing link 5 and the slide 3 may be connected and synchronized.

The swing fulcrum pin 8 of the swing link 5 is connected to one end of the screw shaft 11 of the bottom dead center correction device 10. A screw shaft 11 erected on the swing fulcrum pin 8 is fitted to a case 12 fixed to the frame 2 so as to be vertically movable, and has a screw portion 11A at an upper end. In the case 12, a worm wheel 13 provided with a female screw screwed into the screw portion 11A of the screw shaft 11 at the center and a worm shaft 14 engaged with the worm wheel 13 are provided inside. Using a brake motor (not shown) connected to the worm shaft 14 as a drive source, the worm shaft 14
By rotating the screw shaft 11 forward / reverse via the worm wheel 13 and the worm wheel 13, the position of the swing fulcrum pin 8 of the swing link 5 is moved up and down by a required dimension, and the bottom dead center position of the slide 3 is moved. Adjust In the present embodiment, the power source for driving the worm shaft 14 is a brake motor, but a motor such as a servomotor may be used as the power source.

As shown in FIG. 2, main gears 15 and 15 are provided at both ends of a crankshaft 4 rotatably supported by bearings of the frame 2, and a drive shaft 16 rotatably supported by the frame 2 is provided. And the pinions 17, 17 provided at the same position. A flywheel 18 rotatably provided at one end of the drive shaft 16 is rotatably driven by a main motor 19, and the power of the flywheel 18 is connected / disconnected by a clutch / brake (not shown) built in the flywheel 18 to drive the flywheel 18.
Is rotated / stopped.

A bolster 20 is fixedly mounted on a bed 21 at a lower portion of the frame 2, and the lower surface of the slide 3 and the bolster 2
The upper die and the lower die (not shown) are mounted on the upper surface of the slide No. 0, and the slide 3 is moved up and down by the slide drive device configured as described above to perform press working. At this time, as described above, since the connecting links 9 and 9 are almost upright only by falling down by a small angle from the vertical direction, almost all the power transmitted from the crank pin 4A becomes the pressing force of the slide 3, No thrust force for pushing the slide 3 laterally is generated. At the same time, the bottom dead center correction device 10 shown in FIG.
When the swing fulcrum pin 8 of the swing link 5 is moved up and down by a required distance, a small correction amount of the bottom dead center of the slide 3 proportional to this movement distance can be obtained.

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the groove 6 provided in the longitudinal direction of the swing link 5 in the first embodiment shown in FIG.
The same as the first embodiment including the bottom dead center correction device 10 except that an arc-shaped groove 26 having an upper center is formed in which the divided sliders 7A and 7B which are divided into two vertically are slidably fitted. This is a configuration, and the description is omitted.

The slider link press 1 having the swing link 5 of the first embodiment in which the shape of the groove 6 is linear,
The swing link 2 of the second embodiment in which the shape of the groove 26 is an arc.
5, the stroke curve of the slider link press 1A provided with the slide 5 has a slow descending stroke of the slide 3 and a long descending area, a fast ascending stroke and a short ascending area, but the curvature radius R of the arc and the crankshaft of the crank pin 4A. As the ratio of the amount of eccentricity r to 4 increases, the descending stroke becomes shorter and approaches the crank motion.

FIG. 4 shows a slide (3) in which the horizontal axis represents the amount of vertical movement of the swing fulcrum pin (8) of the swing link (5).
FIG. 3 is an example of a diagram in which the bottom dead center correction amount is expressed as a vertical axis.
With the above configuration, the amount of movement of the swing fulcrum pin (8) is proportional to the amount of bottom dead center correction of the slide (3). Therefore, the bottom dead center position of the slide (3) is minutely set by the bottom dead center correction device (10) in addition to being set by the die height adjusting device formed between the connecting link (9) and the slide (3) in the normal operation. The position of the bottom dead center of the slide (3) can be adjusted, and a more stable and more accurate pressed product can be obtained.

FIG. 5 shows a third embodiment in which another bottom dead center correction device 10A is provided in the slide drive device of the first embodiment. The slide drive device has the same configuration as in the first embodiment, and a description thereof will be omitted. A bracket 28 is fixedly mounted on the frame 2 above the swing fulcrum pin 8, and a servomotor 30 provided with a screw shaft 29 is erected on the bracket 28. The screw shaft 29 is connected to the swing fulcrum pin 8 and screwed with a female screw member 31 erected on the swing fulcrum pin 8. Female screw member 31
Is a female screw portion 31 screwed to the screw shaft 29 on the screw shaft 29 side.
A, the outer peripheral portion is slidably fitted to the bracket 28, and is guided up and down by the bracket 28 by forward / reverse rotation drive of the servo motor 30, and the swing fulcrum pin 8 of the swing link 5 Is moved up and down by a required dimension to adjust the position of the bottom dead center of the slide 3. In this embodiment, the servo motor 30 is provided directly on the screw shaft 29. However, a pulley is provided on the shaft end of the screw shaft 29 and the shaft of the servo motor 30, and the power of the servo motor 30 is supplied via a belt. It may be transmitted to the shaft 29. Further, the power source in the present embodiment is the servo motor 30, but a geared motor or the like may be used as the power source.

FIG. 6 shows an oscillating link 5 in which the shape of the groove 6 of the slide driving device according to the third embodiment is linear, and an oscillating link in which the shape of the groove 26 is arc-shaped as in the second embodiment. 25 shows a fourth embodiment in which a slide drive device is configured.

FIG. 7 shows a fifth embodiment in which another bottom dead center correction device 10B is provided in the slide drive device of the first embodiment. The slide drive device has the same configuration as in the first embodiment, and a description thereof will be omitted. A bracket 32 is fixed to the frame 2 above the swing fulcrum pin 8.
A servo cylinder 33 stands upright, and the servo cylinder 33
A clevis 34 is provided at the tip of the rod 33A.
It is connected to the swing fulcrum pin 8 of the swing link 5. When the rod 33A of the servo cylinder 33 moves a required stroke amount set by receiving a signal from a control device (not shown), the rod 33A of the servo cylinder 33 moves in synchronization with the operation stroke amount of the servo cylinder 33, and The position is moved up and down by a required size to adjust the position of the bottom dead center of the slide 3.

FIG. 8 shows an oscillating link 5 in which the shape of the groove 6 of the slide drive device of the fifth embodiment is linear, and an oscillating link in which the shape of the groove 26 is arc-shaped, as in the second embodiment. Reference numeral 25 denotes a sixth embodiment in which a slide drive device is configured.

[0024]

As is apparent from the above description, according to the present invention, the swing fulcrum pin of the swing link is provided as far as possible from the crankshaft, and the connecting link is provided in the vertical direction. Accordingly, the amount of vertical movement of the swing fulcrum pin is proportional to the displacement of the bottom dead center of the slide, and minute bottom dead center can be easily corrected quantitatively. Furthermore, the pressing force for driving the slide with the crank pin is almost 100%.
The transmission can be performed with high efficiency, and the thrust force is hardly generated on the slide, so that a more accurate press working can be performed.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a slider link press according to a first embodiment of the present invention.

FIG. 2 is a front view of the main part,

FIG. 3 is a front view of a main part of a slider link press according to a second embodiment of the present invention.

FIG. 4 is a diagram showing the relationship between the displacement of the swing fulcrum pin and the bottom dead center displacement of the slide according to the present invention.

FIG. 5 is a front view of a main part of a slider link press according to a third embodiment of the present invention.

FIG. 6 is a side view of a main part of a slider link press according to a fourth embodiment of the present invention.

FIG. 7 is a side view of a main part of a slider link press according to a fifth embodiment of the present invention.

FIG. 8 is a side view of a main part of a slider link press according to a sixth embodiment of the present invention.

[Explanation of symbols]

1, 1A is a slider link press, 2 is a frame, 3 is a slide, 3A is a spherical bearing, 4 is a crankshaft, 4A is a crank pin, 5 is a swing link, 5A is a spherical bearing, 6, 6
A is a groove, 7 is a slider, 7A and 7B are divided sliders, 8
Is a swing fulcrum pin, 9 is a connecting link, 9A and 9B are spheres,
10, 10A and 10B are bottom dead center correction devices, 11 is a screw shaft, 11A is a screw portion, 12 is a case, 13 is a worm wheel, 14 is a worm shaft, 15 is a main gear, 16 is a drive shaft, 17 is a pinion, 18 Is flywheel, 19
Is a main motor, 20 is a bolster, 21 is a bed, 2
5 is a swing link, 26 is a groove, 27 is a slider, 27A,
27B is a divided slider, 28 is a bracket, 29 is a screw shaft, 30 is a servomotor, 31 female screw member, 31A is a female screw part, 32 is a bracket, 33 is a servo cylinder, 3
3A is a rod and 34 is a clevis.

Claims (4)

[Claims] 1. The rotational output of a crankshaft that is rotationally driven,
In a slider link press for converting a reciprocating motion into a reciprocating motion through a swing link and moving the slide up and down, (a) a crank shaft rotatably provided in a frame above the slide in a horizontal direction and (b) the crank A swing link that reciprocates around a swing fulcrum pin provided at a position parallel to and away from the crankshaft, in a direction substantially perpendicular to the axis, and (c) a crank pin of the crankshaft. A slider rotatably fitted and slidably provided in a linear groove in the longitudinal direction of the rocking link or in an arc-shaped groove having a center at an upper part; (d) a lower surface of the rocking link and The upper and lower ends of the slide are swingably connected to each other to form a slide drive device with a connection link provided in a vertical direction. Fulcrum pin The slider link press, wherein a bottom dead center correction device of a slide for moving the location in the vertical direction, equipped. 2. A case according to claim 1, wherein the bottom dead center correction device for the slide is fixed to a frame above the swing fulcrum pin, and a worm wheel provided inside the case. (C) a worm shaft engaged with the worm wheel and driven by a motor; and (d) a screw shaft for screwing a screw portion provided at one end to the worm wheel and connecting the other end to the swing fulcrum pin. And a slider link press comprising: 3. A motor according to claim 1, wherein the bottom dead center correction device for the slide is: (a) a motor that is erected directly on a frame above the swing fulcrum pin or via a bracket;
(B) a screw shaft connected directly to the motor or via a pulley and a belt; and (c) a female screw connecting the female screw portion provided at one end to the screw shaft and connecting the other end to the swing fulcrum pin. A slider link press, comprising: a member; 4. The servo cylinder according to claim 1, wherein the bottom dead center correcting device for the slide is directly mounted on a frame above the swing fulcrum pin or on a frame via a bracket, and directly on a rod of the servo cylinder. Alternatively, a slider link press characterized by being connected to the swing fulcrum pin via an intermediate member.