JPH10109192A - Slide drive device of mechanical press using link - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change stroke length and die height even during a press operation by adjusting a position of a fulcrum pin, also to correct a bottom dead center position by changing finely the die height during the operation, and further to make an equipment compact since a specific fulcrum pin is installed inside a plunger and a specific link is arranged inside the plunger. SOLUTION: When a crank shaft 12 is rotate, and oscillating movement of a connecting rod 13 is performed, and a reciprocating movement of a slip piece 14 is performed to the left and the right. A slide 3 is elevated and lowered through second link 22, third link 23 and fourth link 24. At this time, a balance weight 40 is elevated and lowered by actions of the fourth link 24 and a sixth link 26, and a dynamic balance to elevating and lowering of the slide 3 is kept. When changing elevating and lowering stroke length and a bottom dead center position of the slide 3, a worm is turned, and a first fulcrum pin 31 which is a fulcrum, is moved to the left and the right by an action of a screw bar 11.

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, Japanese Patent Application Laid-Open No. H08-118082 can be mentioned as one having a relatively small number of links, a small change in the bottom dead center position due to the inertia force of the slide, and easy to cope with a change in press speed.

However, the above-mentioned conventional example does not disclose a device for changing a slide stroke length and a die height.

[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.

[0005]

A divided vertical link having a fulcrum that can be adjusted in the horizontal direction as a fulcrum is provided, and this fulcrum and both of the divided links are connected via another link.

A plunger fixed to a slide and movable up and down by being guided by a frame of a mechanical press, a crankshaft having a pair of eccentric portions having the same eccentricity and having a phase difference of 180 °, and a large end portion provided on the eccentric portion. A crank mechanism composed of a pair of left and right connecting rods connected to each other, a slider connected to a small end of the connecting rod and guided in a left and right direction by a groove provided in a frame; , A first link having one end connected to the first fulcrum pin, a second link having one end connected to the slider, and a second link. And a third link having one end connected to the other end of the first link and the other end connected to the plunger to drive these slides. By deploying the linkage symmetrically, constitute a slide drive unit for a mechanical press with a link that can alter the stroke length and the bottom dead center position of the mechanical press slide.

Further, a second fulcrum pin provided at a position inside the plunger on the shelf of the frame above the slide, a fifth link having one end connected to the second fulcrum pin, and a third link A fourth link whose one end is connected to the other end of the fourth link and the plunger at one end thereof, and whose other end of the fifth link is connected substantially at the center, and one end of which is connected to the other end of the fourth link. And a balance weight guided by the frame and movable up and down. The balance weight is connected to the other end of the sixth link, and a link mechanism for driving these balance weights is symmetrically arranged. By arranging them, a slide drive device of a mechanical press using the link is configured.

[0008]

When the position of the fulcrum is changed, the angle formed by the two links which are divided, connected and in a V-shape changes, so that the die height changes. At the same time, the stroke length changes by the cumulative amount of slide displacement. This will be described later in detail with reference to FIGS. 2 and 3 of the present application.

[0009]

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 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 screwed into the worm wheel 9, and when the worm 8 rotates, the worm wheel 9 rotates and the screw rod 11 moves left and right.

A crankshaft 12 is rotatably provided on the frame 1, and the crankshaft 12 is provided with an eccentric portion having the same eccentricity and a phase difference of 180 °. The large ends of the pair of left and right connecting rods 13 are connected to these eccentric portions, respectively.

The second link 22 is connected to the small end of the connecting rod 13 together with the slider 14 via a third pin 33.

The slider 14 is movably guided in the left-right direction by a groove provided in the frame 1.

When the crankshaft 12 rotates, the connecting rod 13 swings and the slider 14 reciprocates right and left.

Since the apparatus of the present invention is symmetric in FIG. 1, the structure of the left half will be described below.

One end of the first link 21 is connected to the screw rod 11 by a first fulcrum pin 31.

One end of the second link 22 and one end of the third link 23 are connected to the other end of the first link 21 by a second pin 32.

The other end of the third link 23 and the fourth link 24
Is connected to the plunger 6 by a fourth pin 34.

A second fulcrum pin 37 is provided on the shelf 3 of the frame 1 above the slide 3. This second fulcrum 37
One end of the fifth link 25 is connected to the pin.

The other end of the fifth link 25 is connected to the fourth link 2
The fourth pin 4 is connected to a substantially central portion by a fifth pin 35.

The other end of the fourth link 24 is connected to a sixth pin 36
To the sixth link 26.

A bracket 41 is fixed to the frame 1, and a balance weight guide rod 42 is fixed to the bracket 41.

The balance weight guide rod 42 is fitted to a guide member 43 fixed to the balance weight 40, and the balance weight 40 is guided by the balance weight guide rod 42 and can be moved up and down.

The sixth link 26 has a balance weight 40
Are connected by an eighth pin 38.

The operation of the apparatus of the present invention will be described below in the order of moving the slide 3 up and down for a press operation, changing the length of the up / down stroke of the slide 3 and changing the position of the bottom dead center.

When the crankshaft 12 rotates, the connecting rod 13 swings and the slider 14 reciprocates right and left. The slide 3 moves up and down via the second link 22, the third link 23 and the fourth link 24. At this time, the balance weight 40 is moved up and down by the action of the fourth link 24 and the sixth link 26, and a dynamic balance with respect to the movement of the slide 3 is obtained.

To change the vertical stroke length of the slide 3 and the position of the bottom dead center, the worm 8 is turned, and the first fulcrum pin 31 serving as a fulcrum is moved left and right by the action of the worm wheel 9 and the screw rod 11.

FIG. 3 shows the amount of movement of the first fulcrum pin 31, that is, the amount of change in the stroke length of the slide 3 with respect to the adjustment amount (ADJ) and the position of the bottom dead center.

The values shown in FIG. 3 are obtained by drawing as shown in FIG. Crankshaft 12 is O
, The center of the slider 14 reciprocates right and left between S1 and S2 by the action of the connecting rod 13. When the position of the first fulcrum pin 31 is changed to A1 to A4, the upper end of the vertical reciprocation of the slide 3 is P1
In P4, the lower ends are Q1 to Q4. Here, the horizontal axis is A
1 to A4, and the vertical axis is P1-Q1, P2-Q2, P3
FIG. 3 is a plot of −Q3 and P4-Q4 in correspondence. A lower polygonal line q indicates a change in die height when the position of the first fulcrum pin 31 is changed, that is, when so-called slide adjustment is performed. The difference between the upper polygonal line p and the lower polygonal line q is the stroke length of the slide 3. In the case of this embodiment, as shown, A1, A2, A3, A4
Are the stroke lengths corresponding to 9, 23.5, 43, 6
It is 4.5 mm. FIG. 3 shows that the stroke length and the die height can be adjusted at the same time.

[0033]

The stroke length and the die height can be changed by adjusting the position of the first fulcrum pin 31. The stroke length and die height can be changed during the press operation. Therefore, the so-called bottom dead center position can be corrected by changing the die height to a small amount during operation. Further, the second fulcrum pin 37 is connected to the plunger 6.
Since the sixth link 26 is provided inside the plunger 6, the device becomes compact.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of a cross section in an embodiment of the present invention (a left half shows a top dead center and a right 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 slider, 21 is a first link, 22 is a second link, 23 is a third link, 24 is a fourth link, 25 is a fifth link, 26
Is the sixth link, 31 is the first fulcrum pin, 32 is the second pin,
33 is a third pin, 34 is a fourth pin, 35 is a fifth pin, 3
6 is a sixth pin, 37 is a second fulcrum pin, 38 is an eighth pin,
40 is a balance weight, 41 is a bracket, 42 is a balance weight guide rod, and 43 is a guide member.

Claims (2)

[Claims] 1. A slide drive device for a mechanical press using a link capable of changing a stroke length and a bottom dead center position of the slide (3) of the mechanical press. A plunger (6) installed and guided by a frame (1) of a mechanical press and capable of moving up and down;
(B) A crankshaft (12) having a pair of eccentric portions having the same amount of eccentricity and being out of phase by 180 °, and a pair of left and right connecting rods (13) whose large ends are connected to the eccentric portions. (C) a slider (14) connected to the small end of the connecting rod (13) and guided movably in the left-right direction by a groove provided in the frame (1); A) a first fulcrum pin (31) provided on the frame (1) so as to be adjustable in the left-right direction; and (e) a first link (21) having one end connected to the first fulcrum pin (31). ) And a second link (2) having one end connected to the slider (14).
2) and (f) one end is connected to the other end of the second link (22) and the other end of the first link (21), and the other end is connected to the plunger (6). And a link mechanism for driving the slide (3) is provided symmetrically in the left-right direction. 2. A fulcrum pin (37) provided at a position inside the plunger (6) on a shelf of the frame (1) above the slide (3). ), (B) a fifth link (25) having one end connected to the second fulcrum pin (37), (c) the other end of the third link (23), and the plunger (6). At one end thereof and the fifth link (25).
The fourth link (2) whose center is connected to the other end of
4), (d) a sixth link (26) having one end connected to the other end of the fourth link (24), and (e) a vertically movable balance guided by the frame (1). A weight mechanism for connecting the balance weight to the other end of the sixth link, and disposing a link mechanism for driving the balance weight symmetrically. A slide drive device for a mechanical press using a link.