JPH10109194A - Device for driving slide of mechanical press by using link - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select the optimum stroke length of a slide to many kinds of press work in one mechanical press, because the stroke length of the slide is remarkably changeable by changing the position of a slider. SOLUTION: A bolster 2 is fixed to the frame 1 of the mechanical press, the slide 3 is provided freely ascendably and descendably, an upper die and lower die are respectively set to the slide 3 and bolster 2 and pressing is executed. A plunger 6 is fixed to the slide 3 and the plunger 6 is freely slidably fit in a plunger guide 7 fixed to the frame 1. A nut 16 is fixed to the 2nd slider 15 which is guided with a guide provided on the frame 1 and freely positioned in the right and left directions. In this structure, when a worm 8 is rotated, a worm wheel 9 is rotated and the 2nd slider 15 is reciprocated by the action of a screw bar 11 and the nut 16. To change the stroke length and die height, the position of the 2nd slider 15 is changed by rotating the worm 8.

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 mechanical press using a link.

[0002]

2. Description of the Related Art There are many applications relating to a device for driving a slide of a mechanical press using a link. Among them, the link mechanism is arranged symmetrically to improve the dynamic balance and is suitable for high-speed operation.
74.

However, the above-mentioned prior art does not disclose an apparatus for greatly changing the stroke length of a slide.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for driving a slide of a mechanical press which can simultaneously change a stroke length and a die height. In particular, the stroke length can be significantly changed,
It is an object of the present invention to improve the prior art by adding a device which compensates for a change in bottom dead center during a press operation using a slightly changing die height.

[0005]

The position of the fulcrum of the upper link among the V-shaped links constituting the toggle mechanism can be adjusted.

A large end is connected to a plunger fixedly mounted on a slide and guided by a frame and capable of ascending and descending, a crankshaft having a pair of eccentric portions having the same eccentricity and a phase difference of 180 °, and a pair of eccentric portions. It has a crank mechanism composed of a pair of left and right connecting rods, a linear movement mechanism that moves the small end of the connecting rod in a substantially horizontal direction, and a toggle link that forms a U-shape. A third link, which is connected to the moving mechanism by a link, connects an upper end of a second link that forms an upper link of the toggle link to a first fulcrum pin that is horizontally position-adjustable, and forms a lower link of the toggle link. Of the mechanical press slide by connecting the lower end of the It is To configure the press slide drive apparatus using a link that can alter the bottom dead center position.

[0007]

When the position of the fulcrum of the upper link is changed, the angle formed by the upper link and the lower link changes, and the height of the lower end of the lower link changes. Therefore, the height of the slide of the mechanical press changes. Since the height of the slide changes, the die height changes, and the stroke length of the slide changes according to the change in the swing position of the toggle link accompanying the change in the slide height.

[0008]

In FIG. 1, a bolster 2 is fixed to a frame 1 of a mechanical press, and a slide 3 is provided so as to be able to move up and down. An upper die and a lower die are set on the slide 3 and the bolster 2, respectively. Then, press working is performed.

A slide guide rod 5 is fixed to the slide 3, and the slide guide rod 5 is fitted to a slide guide post 4 fixed to the frame 1.

A plunger 6 is fixed to the slide 3,
The plunger 6 is slidably fitted to a plunger guide 7 fixed to the frame 1.

A worm 8 is rotatably provided on the frame 1, while a worm wheel 9 is rotatably held on the frame 1 by a cap 10. The worm 8 and the worm wheel 9 are engaged.

A screw rod 11 is fixed to the worm wheel 9, and the screw rod 11 is screwed into a nut 16. The nut 16 is guided by a guide provided on the frame 1 and is capable of adjusting the position in the left-right direction.
It is fixed to. When the worm 8 rotates, the worm wheel 9 rotates, and the second slider 15 reciprocates by the action of the screw rod 11 and the nut 16.

A crankshaft 12 is rotatably provided on the frame 1. The crankshaft 12 is provided with a pair of eccentric portions having the same amount of eccentricity and having a phase difference of 180 °. Pair of connecting rods 13
Are connected at their large ends.

Since the apparatus of the present invention is symmetrical, the left half will be described below.

At the small end of the connecting rod 13,
One end of the first link 21 and the lower end of the fourth link 24 are connected by a first pin 41. The upper left end of the fourth link 24 is connected to one end of the fifth link 25 by a fourth pin 44. The other end of the fifth link 25 is connected to a second fulcrum pin 32 provided on the frame 1. The upper right end of the fourth link 24 is connected to one end of the sixth link 26 by a fifth pin 45. The other end of the sixth link 26 is connected to a third fulcrum pin 33 provided on the frame 1.

When the crankshaft 12 rotates, the connecting rod 13 swings and the first pin 41 makes a pseudo-linear movement by the action of the fourth link 24. That is, the first pin 41 is configured to reciprocate linearly in a substantially horizontal left and right direction.

The other end of the first link 21 is connected to the second link 2
One end of each of the second and third links 23 is connected by a second pin 42. The other end of the second link 22 is connected to the second slider 15 via a first fulcrum pin 31. Here, the first link 21, the second link 22, and the third link 23
A so-called toggle link is formed. In this application,
The point where the second link 22 is connected to the upper link, the third link 23 is connected to the lower link, and the point where the upper and lower links are connected is referred to as a bending point.

The other end of the third link 23 is connected to the plunger 6
And one end of the seventh link 27 via a third pin 43.

A bracket 17 is fixedly mounted on the shelf-like portion of the frame 1 above the slide 3, and a fourth
A fulcrum pin 34 is provided. This fourth fulcrum pin 34
The one end of the eighth link 28 is connected to the
The other end of the sixth pin 46 is substantially at the center of the seventh link 27.
Are connected by

The other end of the seventh link 27 is connected to the lower end of the balance weight 40 by a seventh pin 47.

The frame 1 is provided with a fifth fulcrum pin 35, and one end of a ninth link 29 is connected to the fifth fulcrum pin 35. The other end of the ninth link 29 is connected to an upper end of the balance weight 40 by an eighth pin 48.

In FIG. 1, the movement of the first pin 41 is made to be a pseudo straight line by using the T-shaped fourth link 24, but this linear movement mechanism is, as shown in FIG. The first slider 14 may be connected, and the first slider 14 may be guided by a guide provided on the frame 1.

When the crankshaft 12 rotates, the connecting rod 13 swings. The operation of the fourth link 24 and the like causes the first pin 41 to perform a pseudo-linear motion. The slide 3 moves up and down by the action of the toggle mechanism constituted by the second link 22, the third link 23 and the first link 21.

The balance weight 40 moves up and down while swinging by the action of the seventh link 27, the ninth link 29, and the like. The slide 3 is dynamically balanced by the balance weight 40.

When changing the stroke length and the die height, the worm 8 is turned to change the position of the second slider 15.

FIG. 3 shows the die height and the stroke length with respect to the amount of movement of the second slider 15. This figure 3
Is obtained by the drawing shown in FIG.

In FIG. 2, the position of the second slider 15 is indicated by A.
The height of the top dead center of slide 3 when P1 to A6 is P1
From P6, the height of the bottom dead center is Q1 to Q6. Therefore,
When the position of the second slider 15 is A1 to A6, the die height is Q1 to Q6, and the stroke length is Pi-Qi. Here, i = 1 to 6 is meant.

In FIG. 3, the above P1 to P6, Q1 to Q
If 6 is represented by a polygonal line according to A1 to A6, it becomes a p-line and a q-line. The q line indicates the die height, and the distance between the p line and the q line indicates the stroke length.

[0029]

The stroke length of the slide 3 can be greatly changed by changing the position of the second slider 15, so that the stroke length of the slide most suitable for various types of press work with one mechanical press. Can be selected. Further, when the stroke length of the slide is changed, the die height slightly changes, so that a so-called bottom dead center position correction function of the slide can be performed using the same device.

[Brief description of the drawings]

FIG. 1 is a front view with a partial cross section (a right half shows a top dead center, and a left half shows a bottom dead center).

FIG. 2 is an explanatory diagram for calculating a change in a stroke length with respect to an adjustment amount;

FIG. 3 is an explanatory diagram showing a change in a stroke length with respect to an adjustment amount.

[Explanation of symbols]

1 is a frame, 2 is a bolster, 3 is a slide, 4 is a slide guide post, 5 is a slide guide rod, 6 is a plunger, 7 is a plunger guide, 8 is a worm, 9 is a worm wheel, 10 is a cap, and 11 is a screw rod. , 1
2 is a crankshaft, 13 is a connecting rod, 14 is a first slider, 15 is a second slider, 16 is a nut, 17 is a bracket, 21 is a first link, 22 is a second link, 23
Is the third link, 24 is the fourth link, 25 is the fifth link,
26 is a sixth link, 27 is a seventh link, 28 is an eighth link, 29 is a ninth link, 31 is a first fulcrum pin, 32 is a second fulcrum pin, 33 is a third fulcrum pin, and 34 is a fourth fulcrum pin. Pin, 35 is the fifth fulcrum pin, 40 is the balance weight, 4
1 is a first pin, 42 is a second pin, 43 is a third pin, 44
Is a fourth pin, 45 is a fifth pin, 46 is a sixth pin, 47 is a seventh pin, and 48 is an eighth pin.

Claims (1)

[Claims] 1. A slide drive device for a press using a link capable of changing a stroke length and a position of a bottom dead center of a slide (3) of a mechanical press, wherein (a) the slide drive device is fixed to the slide (3). And a crank shaft (12) having a pair of eccentric portions having the same amount of eccentricity and being out of phase by 180 ° and a pair of eccentric portions. (C) a linear moving mechanism for moving the small end of the connecting rod (13) in a substantially horizontal direction, and (c) a linear moving mechanism for moving the small end of the connecting rod (13) in a substantially horizontal direction. D) a toggle link having a U-shape,
A second link (2) which is connected to the bending point by a link with the linear movement mechanism and forms an upper link of the toggle link.
The upper end of 2) is connected to a first fulcrum pin (31) whose position can be adjusted in the horizontal direction, and the lower end of a third link (23) which forms a lower link of the toggle link is connected to the plunger (6). A slide drive device for a mechanical press using links, wherein link mechanisms for connecting and driving the slides (3) are arranged symmetrically.