JPH11320187A - Slide driving device of link press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the device and enable processing of a high accurate product by effectively transmitting a pressing force to a slide in a vertical direction without occurrence of a thrust force to the slide. SOLUTION: A longitudinal groove is formed at a center portion of a frame 1A by a guide, and a slide 14 internally installed in the groove and the other side of a connecting rod 11 connected to a crank shaft 9 are connected to an upper link 16 with the first connecting pin 15 together. An upper arm 19A of a bell crank 19 connected to the first supporting point pin 18 supported on the frame 1A, and the other side of the upper link 16, are connected to the second connecting pin 17. The other side of an intermediate link 22 connected to a lower arm 19B with the third connecting pin 21 and the other side of a lower link 26 connected to a slide 28 are connected to a bracket 23 installed on the frame 1A with the fourth connecting pin 27 together with a transverse link 25 connected with the second supporting point pin 24. These members are symmetrically arranged on right and left sides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide driving device for a press machine using a link mechanism, and is particularly effective for a slide driving device for a link press used for processing a highly accurate product.

[0002]

2. Description of the Related Art A press machine that drives a slide up and down by using a link mechanism includes, for example, Japanese Patent Publication No. 46-22424 in which the lower end of a lower link is directly connected to a slide, and a plunger provided with a thrust force on a frame. There is Japanese Patent Application Laid-Open No. H08-118082, which is configured to be connected to the upper end of a plunger that stands on a slide so as to be received by a guide.

[0003]

In a slide driving device for a press machine using a link mechanism, when the link mechanism bends and extends to drive the slide up and down, the lower link rises up at a large angle with respect to the vertical direction. Therefore, the pressing force is not effectively transmitted vertically to the slide during the press working, and is not suitable for processing a high-precision product. In particular, in a slide drive device in which the lower link is directly connected to the slide, a large thrust force acting on the slide is generated immediately at the start of pressing the slide and when the slide is driven downward,
Tilt the slide up and down, lowering the accuracy of the press machine. For this reason, a slide drive device configured to receive the thrust force by the plunger guide is often used in spite of an increase in the number of constituent members. Since it becomes larger, practical effects cannot be expected much. Also, due to its structure,
The distance between the left and right points of the slide becomes large, and the press machine becomes large regardless of the pressure capacity of the press machine.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to make the inclination angle of a lower link for raising and lowering a slide small, and to directly connect the lower link and the slide without using a plunger and a plunger guide. However, it is an object of the present invention to provide a slide drive for a link press that can reduce the distance between points and reduce the size of a press machine without generating a thrust force on a slide, and can process a product with high accuracy.

[0005]

In order to solve the above-mentioned problems, the present invention provides a crank which is directly connected to a flywheel or connected via a reduction gear by power transmitted to the flywheel using a motor as a power source. A slide drive device for a link press that raises and lowers a slide guided by a slide guide via a shaft, a connecting rod connecting a base end portion to an eccentric portion of the crankshaft, and a link member connecting a distal end portion of the connecting rod. A guide which is provided at the center part of the frame of the link press so as to face the front and rear, or at one of the front and rear, and which forms a vertical groove in the vertical direction; An upper link for connecting the lower end together of the slider and the tip of the connecting rod with a first connecting pin, and an upper end and an upper link of the upper link. A bell crank which is connected to the tip of the bell by a second connecting pin and is swingably connected to a first fulcrum pin supported by the frame; one end of which is a tip of the lower arm of the bell crank and a third connecting pin; And a middle link connected by
A lower link whose lower end is swingably connected to the slide adjusting device of the slide, and a distal end is connected to the frame together with a lower end of the middle link and an upper end of the lower link by a fourth connecting pin, and provided on the frame. And a horizontal link whose base end is swingably connected to the stationary member by a second fulcrum pin, and the arrangement of these members is left-right symmetric.

[0006]

1 to 4 show an embodiment of a slide drive device for a link press according to the present invention. FIG.
FIG. 2 shows a first embodiment of the present invention. FIG. 1 is a front sectional view of the link press 1 when the slide is at a top dead center, and FIG. 2 is a sectional view taken along the line AA of FIG. 1 and 2
As shown in FIG. 1, a frame 1A of the link press 1 is provided with a main motor 2 as a power source, and is connected to a flywheel 5 provided on a drive shaft 6 via a pulley 3 and a belt 4.
The power of the main motor 2 is transmitted by connecting / disconnecting a clutch / brake (not shown). A pinion 7 is provided on the drive shaft 6 and meshes with a main gear 8 provided on a crankshaft 9 rotatably supported by the frame 1A. The base end of the connecting rod 11 is connected to the eccentric part 9A of the crankshaft 9.

At the center of the frame 1A, there is provided a guide 12 for vertically forming a vertical groove 13 facing the front and rear, and a slider 14 is provided in the vertical groove 13 of the guide 12 so as to be vertically movable. I do. Slider 14 and connecting rod 11
Are connected to the lower end of the upper link 16 together by the first connection pin 15. Above the frame 1A, a first fulcrum pin 18 supported by the frame 1A is provided, and a bell crank 19 is swingably connected. The bell crank 19 connects the tip of the upper arm 19A of the bell crank 19 above the first fulcrum pin 18 to the upper end of the upper link 16 with the second connection pin 17, and the bell crank 19 below the first fulcrum pin 18 The distal end of the arm 19B is connected to one end of the middle link 22 by a third connecting pin 21.

A slide adjusting device 29 for adjusting the die height H is provided on the slide 28, and a lower link 26 for swingably connecting a ball-shaped lower end is provided upright.
A bracket 23 is fixed below the frame 1A,
The base end of the horizontal link 25 is swingably connected with the second fulcrum pin 24. The distal end of the horizontal link 25 is connected to the fourth connecting pin 27 together with the lower end of the middle link 22 and the upper end of the lower link 26.
Connect with.

As shown in FIG. 1, the above-mentioned link members are symmetrically arranged to constitute the slide drive device of the first embodiment. The slide 28 guided by the slide guides 31, 31 by the slide drive device configured as described above moves up and down by a predetermined stroke length S from a top dead center indicated by a solid line to a bottom dead center indicated by a two-dot chain line. repeat.

As shown in FIG. 1, the crankshaft 9 rotates to move the slide 28 up and down a predetermined stroke length S, and the eccentric portion 9A of the crankshaft 9 rotates along the locus a of the center O1. Then, the first connecting pin 15 for connecting the distal end of the connecting rod 11, the lower end of the upper link 16 and the slider 14 is regulated by the vertical groove 13 of the guide 12, and moves up and down along the locus b of the center O2. I do. As a result, the center O3 of the second connecting pin 17 connecting the upper arm 19A of the bell crank 19 and the upper end of the upper link 16 has a locus c
Rocks along. Also, the lower arm 19 of the bell crank 19
The center O4 of the third connecting pin 21 connecting the B and the middle link 22 is along the locus d, and the center O5 of the fourth connecting pin 27 connecting the middle link 22, the lower link 26 and the lateral link 25 is the locus. rocks along e.

At this time, as described above, the fourth connecting pin 27
O5 swings as shown by the trajectory e, and the lower link 2
6 moves the slide 28 up and down while maintaining a substantially vertical state, so that the parallelism between the slide 28 and the bolster 30 when the slide 28 is raised and lowered is stable, and acts on the slide guides 31 and 31 that guide the slide 28 during the up and down movement. Thrust force can be greatly reduced.

As described above, by making the maximum inclination angle θ at which the lower link 26 swings during one stroke of raising and lowering the slide 28 minute, the lower link and the slide can be directly connected without the intervention of the plunger and the plunger guide. Even in a system in which the slide guide 31 is connected, seizure, early abrasion, breakage, and the like of the slide guide 31 can be prevented, and the pressing force is effectively transmitted to the slide vertically during press working. High-precision product processing can be performed even when processing is started from a high position above the dead center. The lower link 26
In order to reduce the maximum inclination angle θ, the arm of the lower link 26 may be lengthened. However, the lower surface position of the slide 28 is lowered, and the die height specification is reduced. It is necessary to provide extra length, and it is preferable to lengthen the arm of the lateral link 25.

FIG. 3 is a side sectional view of the link press 41 when the slide is at the top dead center in the second embodiment of the present invention. As shown in FIG. 3, the drive shaft (6) and the reduction gears (7, 8) are not provided between the flywheel (5) and the crankshaft (9) in the first embodiment described above, and the flywheel is directly provided. 45 and a crankshaft 49 are connected to form a slide drive device.

The frame 41A of the link press 41 includes
A main motor 42 as a power source is provided, and a crankshaft 49 is provided.
A clutch / brake (not shown) is connected to a flywheel 45 provided above via a pulley 43 and a belt 44.
Then, the power of the main motor 42 is transmitted. The base end of the connecting rod 11 is connected to the eccentric portion 49A of the crankshaft 49.

The structure of a member connecting the connecting rod 11 connected to the crankshaft 49 to the lower link 26 connected to the slide adjusting device 29 of the slide 28 other than the above-described structure is the same as that of the first embodiment, and will be described. Abbreviate.

[0016]

As is apparent from the above description, according to the present invention, the inclination angle of the lower link for raising and lowering the slide is made very small, and thrust force is not generated on the slide, so that the slide can be effectively pressed at the time of press working. Since pressure is transmitted vertically to the slide, highly accurate product processing can be performed. Further, even with a system in which the lower link and the slide are directly connected without using the plunger and the plunger guide, it is possible to prevent the sticking of the slide guide and to improve the life of the mold. Further, since the distance between points can be reduced, the size of the press machine can be reduced.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a link press according to a first embodiment of the present invention.

2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a side sectional view of a main part of a slide drive device according to a second embodiment of the present invention.

[Explanation of symbols]

1 is a link press, 1A is a frame, 2 is a main motor, 3 is a pulley, 4 is a belt, 5 is a flywheel, 6
Is a drive shaft, 7 is a pinion, 8 is a main gear, 9 is a crankshaft, 9A is an eccentric part, 11 is a connecting rod, 1
2 is a guide, 13 is a vertical groove, 14 is a slider, 15 is a first connecting pin, 16 is an upper link, 17 is a second connecting pin, 18 is a first fulcrum pin, 19 is a bell crank, 19A is an upper arm,
9B is a lower arm, 21 is a third connecting pin, 22 is a middle link, 2
3 is a bracket, 24 is a second fulcrum pin, 25 is a lateral link, 26 is a lower link, 27 is a fourth connecting pin, 28 is a slide, 29 is a slide adjustment device, 30 is a bolster, 31
Is a slide guide, 41 is a link press, 41A is a frame, 42 is a main motor, 43 is a pulley, 44 is a belt, 45 is a flywheel, 49 is a crankshaft, and 49A.
Is the eccentric part, and θ is the maximum inclination angle of the lower link.

Claims (1)

[Claims] 1. A crankshaft (9) connected directly to a flywheel or via a reduction gear by power transmitted to a flywheel using a motor as a power source, and an eccentric portion (9A) of the crankshaft (9). ) And a connecting rod (11) connecting the base end to the connecting rod (1).
In a slide drive device of a link press that moves up and down a slide (28) guided by a slide guide (31, 31) via a link member connected to a tip portion of 1),
(B) a guide (12) provided at the center part of the frame (1A) of the link press in the front-rear direction or at one of the front and rear sides and forming a vertical groove (13) in the vertical direction;
(B) A vertically movable slider (14) provided in the vertical groove (13) of the guide (12), and (c) a slider (14) and the tip of the connecting rod (11). The upper link (1) connecting the lower ends together with the first connecting pin (15)
6), and (d) the upper end of the upper link (16) and the upper arm (19).
A bell crank (19) that is connected to the distal end portion of (A) by a second connecting pin (17) and swingably connected to a first fulcrum pin (18) supported by the frame (1A).
And (e) one end of the lower arm (19) of the bell crank (19).
B) a middle link (22) connected to the tip end by a third connecting pin (21); and (f) a lower end pivotally connected to a slide adjusting device (29) of the slide (28). The link (26) is connected to the (g) distal end together with the lower end of the middle link (22) and the upper end of the lower link (26) by a fourth connecting pin (27), and the frame (1A).
And a horizontal link (25) having a base end pivotally connected to a stationary member provided at a second support pin (24).
A slide drive device for a link press, wherein the arrangement of these members is symmetrical.