JPH11226788A - Slider link press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slider link press, with which the pressing force acted to the slide is faced in the vertical direction and the partial force pressing the slide in the side direction is hardly acted and the high precise pressing can be executed. SOLUTION: A shaking link 5 faced in the horizontal direction in a frame 2 at the upper part of the slide 3 is arranged so as to be freely reciprocated with the shaking support shaft 6 which is parallel with a crankshaft 4 and arranged at the sufficiently separated position, as the center. The lower part of the shaking link 5 and the upper part of the slide 3, are connected with a connecting link 9 faced in the vertical direction so as to be freely swung, and the slider 8 loosely fitted to a crank pin 4A of the crankshaft 4 is inserted into a groove 7 in the longitudinal direction of the shaking link 5 so as to be freely slid.

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 high precision.

[0002]

2. Description of the Related Art When cold forging is performed, a crank press, a knuckle press, a lever 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 shown in Japanese Patent Publication No. 51-19189 is connected to one arm of a bell crank, and a sliding element loosely fitted to a crankpin of a crankshaft is inserted into a long hole of the other arm. Some are slidably fitted. As the lever press, for example, Japanese Patent Application Laid-Open
As in -70693, one arm of a lever rotating about a fulcrum shaft is directly engaged with a slide, and a slider loosely fitted to a crankpin of a crankshaft is slidably fitted to a fork of the other arm. There is something inserted. 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 inserted into a groove of a slide.

[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.

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 An object of the present invention is to provide a slider link press having good productivity as a slightly fast-returning motion having a slow stroke and a fast rising stroke.

[0005]

In order to solve the above-mentioned problems, the present invention converts the rotational output of a rotationally driven crankshaft into a reciprocating motion via an oscillating link and raises and lowers a slide. In the slider link press
A crankshaft rotatably provided in the frame above the slide in the horizontal direction, and a swing fulcrum provided at a position parallel to and away from the crankshaft in a direction substantially orthogonal to the crankshaft. An oscillating link that reciprocates around an axis, a slider rotatably fitted to a crank pin of a crankshaft, and slidably provided in a linear groove in the longitudinal direction of the oscillating link; and an oscillating link. And a connecting link which is connected to the upper and lower portions of the slide so as to swing freely at both ends and is provided in a vertical direction.

In the above-described slider link press, the linear groove in the longitudinal direction of the oscillating link is an arc-shaped groove having an upper center.

In the above-described slider link press, the pressing force of the swing link is adjusted so that the component of the pressing force applied to the swing fulcrum shaft of the swing link is 30% or less of the pressing force. An operation point, an operation point of the driving force of the crank pin, and a relative position between the center of the pivot shaft are set.

Further, in the slider link press described above, the slider is divided into upper and lower portions of the crank pin, and each divided slider is provided in the longitudinal direction of the upper surface and the lower surface of the groove of the swing link, or a guide groove. To slidably hold.

[0009]

1 to 7 show an embodiment of a slider link press according to the present invention. FIG. 1 shows a first embodiment of the present invention.
An example will be described. As shown in FIG. 1, 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. In the front-rear direction orthogonal to the crankshaft 4, a swing link 5 that is oriented substantially horizontally is provided.
A swinging fulcrum shaft 6 provided rearward in parallel with the crankshaft 4.
Is provided so as to be able to reciprocate up and down around the center. A groove 7 is linearly formed in the swing link 5 in the longitudinal direction, and a slider 8 rotatably fitted to a crank pin 4A of the crankshaft 4 is slidably fitted into the groove 7. The slider 8 having the upper and lower divided structure is held by a longitudinal guide or a guide groove provided on the upper surface and the lower surface of the groove 7.
By inserting the crank pin 4A, they are slidably fitted to each other.

Spherical bearings 3A and 5A are provided at the center in the front-rear direction of the upper surface of the slide 3 and the lower surface of the swinging link 5 corresponding to the upper and lower sides thereof, and a connecting link 9 having spherical ends at both ends is provided therebetween. Connected. When the swing link 5 is driven up and down by the crank pin 4 </ b> A with the rotation of the crankshaft 4, the spherical bearing 5 rotates about the swing fulcrum shaft 6.
A rotates, so that the center of the spherical bearing 5A is
Is slightly displaced in the front-back direction from above the point center.
To escape this displacement, both ends of the connecting link 9 are swingable by spherical bearings 3A and 5A. However, since the swing link 5 is longer than the stroke of the slide 3, the displacement of the upper and lower ends of the connecting link 9 in the front-rear direction is extremely small, and the connecting link 9 can transmit power in an almost vertical posture. There is an advantage that transmission efficiency is good.

A flywheel 10, which is driven to rotate by a main motor 16, is provided with a clutch / brake (not shown) for transmitting / receiving power to / from a drive shaft 11. A pinion 12 is provided on the drive shaft 11 and meshes with a main gear 13 fixed to the crankshaft 4 to drive the crankshaft 4 to rotate. With the rotation of the crankshaft 4, the crankpin 4 </ b> A rotates the swing link 5 up and down through the slider 8 and the groove 7, and moves the slide 3 up and down through the connecting link 9. Upper and lower dies (not shown) are fixed to the lower surface of the slide 3 and the upper surface of the bolster 15 provided on the bed 14, and press working is performed.

FIG. 2 shows an embodiment of the drive system for transmitting the power of the crankshaft 4 from the drive shaft 11 of the slider link press 1 in the first embodiment. The slider link press 1 shown in FIG.
2 and 12 and main gears 13 and 13 meshing with them
Are provided at both ends of the crankshaft 4.

FIGS. 3 and 4 show a second embodiment and a third embodiment showing another embodiment of the drive system for transmitting the power of the crankshaft 4 from the drive shaft 11. In FIGS. In the slider link press 1 </ b> A of the second embodiment shown in FIG. 3, a pinion 12 provided on a drive shaft 11 hidden behind is engaged with a main gear 13 provided at a central portion of the crankshaft 4. Also,
In the slider link press 1B of the third embodiment shown in FIG. 4, a pinion 12 is provided at the other end of the drive shaft 11, and meshes with a main gear 13 provided at one end of the crankshaft 4.

The slider links 1, 1A,
1B has a slide 3 provided with left and right points, provided with swing links 5 corresponding to the two points, respectively, and connects the point portion and the swing link 5 with connecting links 9, 9 respectively.
Are connected by Since there are two swing links 5, 5, the crankshaft 4 is divided into three parts, a central part and left and right parts, and is connected by a crank pin 4A. The other configurations of the second and third embodiments are the same as those of the first embodiment shown in FIG.

FIG. 5 shows the pressing force P acting on the slide 3 and the force acting on the crankpin 4A of the crankshaft 4 for driving the swing link 5 when press working is performed by the slider link press 1 of the first embodiment. Q and swing fulcrum shaft 6
Shows the ratio of the force T acting on. In the case of the slider link press 1, P: Q: T = 100: 90: 25
And a component T of 30% or less of the pressing force P is applied to the pivot 6.
The position relation of the point of action of the force on the swing link 5 is set so that only the force acts. That is, the crankshaft 4
A moving range of the point of action of the force between the crank pin 4A rotating together with the groove 7 of the oscillating link 5, an extremely small moving range of the point of action of the force of the connecting link 9 and the oscillating link 5 in the horizontal direction,
And the angle between the horizontal direction including the pivot 6 and the direction of the groove 7 and the center of the spherical bearing 5A. The same applies to the second embodiment and the third embodiment.

FIG. 6 shows a fourth embodiment of the present invention. The form of the drive system for transmitting the power of the crankshaft 4 from the drive shaft 11 is the same as that of the above-described embodiment shown in FIGS. As shown in FIG. 6, the swinging link 5 of the slider link press 1S has an arc-shaped groove 7A having an upper center.
The ratio of the radius of curvature R of the arc to the amount of eccentricity r of the crankpin 4A with respect to the crankshaft 4 is 2.5: 1 in the case of the fourth embodiment. The practical range of the ratio of r: r is from 2: 1 to 4: 1. If the ratio of R: r becomes larger than that, the case of the linear groove 7 of the first embodiment shown in FIG. However, practical effects are represented by the first embodiment.

FIG. 7 shows a case where a linear groove 7 is provided in the oscillating link 5 (first to third embodiments) and a case where an arc-shaped groove 7A is provided (fourth embodiment). FIG. 4 is a diagram comparing a stroke curve of a slide with a stroke curve of a slide of a crank press. The stroke curves of the slider link press provided with the oscillating link 5 are all such that the descending stroke of the slide is slow and the descending region is long, and the ascending stroke is fast and the ascending region is short. However, as the above-described R: r ratio increases, the ratio becomes larger. It can be seen that the descending stroke becomes shorter and approaches that of a crank press. If the groove shape is set according to the purpose of use, an optimum press working effect can be obtained.

[0018]

As is apparent from the above description, according to the present invention, the provision of the swinging link and the connecting link enables high-precision press working in a state where the pressing force transmitted to the slide is close to 100%. Can be performed. In addition, by appropriately selecting the point of application of the force of the swing link, the component force applied to the swing fulcrum shaft can be reduced to 30% or less, which is advantageous in manufacturing. Further, by selecting the groove of the oscillating link, the mode of the rapid return motion of the slide stroke can be changed, and an optimal stroke for press working can be applied.

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

FIG. 5 is a side view of a main part showing distribution of force in the first 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 stroke diagram in the embodiment of the present invention.

[Explanation of symbols]

1, 1A, 1B, 1S are slider link presses, 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, and 6 is a swing. A fulcrum shaft, 7, 7A are grooves, 8 is a slider,
9 is a connecting link, 10 is a flywheel, 11 is a drive shaft, 12 is a pinion, 13 is a main gear, 14 is a bed, 15 is a bolster, and 16 is a main motor.

Claims (4)

[Claims] 1. The rotational output of a crankshaft that is rotationally driven,
In a slider link press that converts the motion into reciprocating motion via a swing link and moves the slide up and down,
(B) a crankshaft rotatably provided in the frame above the slide in the horizontal direction, and (b) a near-horizontal direction orthogonal to the crankshaft, parallel to and away from the crankshaft. A swing link that reciprocates around a swing fulcrum shaft provided at a position, and (c) is rotatably fitted to a crank pin of the crankshaft, and is fitted into a linear groove in the longitudinal direction of the swing link. A slider slidably provided;
(D) a slider link press, comprising: a lower end of the swing link and an upper end of the slide, both ends of which are swingably connected to each other, and a connection link is provided in a vertical direction. . 2. The slider link press according to claim 1, wherein the linear groove in the longitudinal direction of the oscillating link is an arc-shaped groove having an upper center. 3. The point of action of the pressing force on the oscillating link, such that the component of the pressing force applied to the oscillating fulcrum axis of the oscillating link is 30% or less of the pressing force. The slider link press according to claim 1 or 2, wherein a relational position between a point of application of a driving force of a crank pin and the center of the pivot shaft is set. 4. The slider is divided into two parts vertically above and below the crankpin, and each of the divided sliders is slidable by guides or guide grooves provided in the longitudinal direction of the upper surface and the lower surface of the groove of the swing link. 2. The slider link press according to claim 1, wherein the slider link press is held.