JPH11347795A - Press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the process of the vertical movement to be set in accordance with the kind of press working by providing one link connected to a slide, a slider connected to the other link and arranged vertically movably on the frame, and a device for adjusting the vertical position of the slider, and thereby making an expanding and contracting movement with the rotation of the crank shaft. SOLUTION: When a first worm wheel 50 is rotated, moving the position of a first slider 34 (pivot 42) upward or downward, the connecting condition changes of a first and a second link mechanism 32, 56, changing the instantaneous speed (process curve). With nearly the same stroke length, the instantaneous speed can be adjusted and changed, raising the pivot 42, slowing down the change in speed near the bottom dead point, and performing precision machining at low speed, as well as lowering the pivot 42, speeding up the change in speed, and performing punching at high speed. With the change in the position of the pivot 66 by a second worm wheel 82, the position of the bottom dead point of the slide 20 can be adjusted, as can the stroke length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine for converting a rotary motion of a crankshaft supported on a frame into a reciprocating motion by a link mechanism and transmitting the reciprocating motion to a slide.

[0002]

2. Description of the Related Art In a press such as a link press, which converts the rotational movement of a crankshaft into a vertical movement by a link mechanism such as a knuckle mechanism or a toggle mechanism and transmits the vertical movement to a slide, generally, the vertical movement of the slide is precisely processed. The process is limited to a certain process determined according to the type of processing, such as (low-speed processing) and processing such as punching (high-speed processing).

That is, the vertical movement of the slide can be expressed as a stroke curve with the vertical position of the slide (the amount of displacement of the slide) in the vertical direction and the horizontal axis of the rotation angle of the crankshaft. On the machine, such a stroke curve was unchanged.

[0004] For this reason, in a conventional press of this type,
Since the speed at each point in the vertical movement of the slide (the instantaneous speed at each point) cannot be changed for the same stroke length, the same press machine can be used for precision machining (low-speed machining) and punching (high-speed machining). Etc. cannot be used in common for various press workings.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to set the stroke of the vertical movement according to the type of press working without changing the stroke of the vertical movement of the slide.

[0006]

According to the present invention, there is provided a press machine comprising: a frame; a slide disposed on the frame so as to be able to move up and down; a crank shaft supported by the frame; And a motion conversion device for converting the motion into a vertical motion.

The motion conversion device is a link mechanism having a pair of links connected so as to be able to bend and extend, wherein one link is connected to the slide and the other link of the link mechanism is pivotally connected. And a position adjusting device for adjusting the position of the slider in the vertical direction, wherein the link mechanism bends and extends with the rotation of the crankshaft. And is connected to the crankshaft.

When the position of the slider in the vertical direction is changed by the position adjusting device, the connecting point between the slider and the other link is displaced upward or downward with respect to the frame, thereby changing the speed (instantaneous speed) at each point in the vertical movement of the slide. Speed) and the slide travel curve changes.

According to the present invention, a link mechanism is used as a motion converting means of a motion converting device for converting a rotational motion of a crankshaft into a vertical motion and reciprocating a slide, and a fixed fulcrum of the link mechanism of the motion converting device. Is connected to the slider, and the position of the slider in the vertical direction (fixed fulcrum) can be changed by the position adjusting device, so that the stroke curve of the slide can be adjusted, and as a result, the stroke of the vertical movement of the slide is almost the same. Nevertheless, the instantaneous speed at each point of the vertical movement can be adjusted according to the type of press working.

[0010] The position adjusting device is a disk-shaped rotating body disposed on the frame so as to be rotatable about an axis extending in the vertical direction and immovable in the vertical direction, the rotating body having a female screw hole; A rotating mechanism for rotating the rotating body, wherein the slider can have a male screw portion screwed into the female screw hole. Thereby, the position of the slider in the vertical direction can be finely adjusted, so that the stroke curve of the slide and the instantaneous speed at each point of the vertical movement can be finely adjusted according to the type of press working.

[0011] The frame may have a guide portion for regulating the reciprocating movement of the slider in a vertical direction.
This allows the slider to be stably received by the frame, so that the bending and extending movement of the link mechanism is stabilized, and the vertical movement of the slide is stabilized.

Each of the press machines has the link mechanism,
It may include a pair of the motion converting devices including the slider and the position adjusting device. In this case, the two link mechanisms are commonly connected to the crankshaft by the connecting device, and the two position adjusting devices are driven synchronously. Thereby, the slide is reciprocated in the vertical direction by the synchronized bending and extension movement of the pair of link mechanisms, so that the vertical movement of the slide is stabilized.

In an embodiment in which the press machine includes a pair of motion converting devices, the connecting device includes the second link mechanism individually corresponding to the motion converting device, the second slider, and the second slider. And a position adjusting device. The two second link mechanisms are commonly connected to the crankshaft and are driven synchronously. Thereby, the slide is reciprocated in the vertical direction through the synchronized bending and extension movement of the pair of second link mechanisms, so that the vertical movement of the slide is further stabilized.

[0014] The press may further include a connecting device for connecting the motion converting device to the crankshaft. The connecting device includes a second link mechanism having a pair of second links connected to bend and extend, and one second
A second slider that is pivotally connected to the link and is disposed on the frame so as to be movable in the vertical direction, a second position adjusting device that adjusts the position of the second slider in the vertical direction, and the crank. A connection piece for connecting the second link mechanism to the crankshaft so as to cause the second link mechanism to bend and extend with the rotation of the shaft. Accordingly, if the position of the second slider in the vertical direction is adjusted, the bending range of the link mechanism connected to the slide changes without moving in the vertical direction, so that the bottom dead center position and the stroke length of the slide are changed. Can be adjusted by the second position adjustment device.

The second position adjusting device is a disk-shaped second rotating body disposed on the frame so as to be rotatable around an axis extending in the up-down direction and immovable in the up-down direction. A second rotating body having a female screw hole, a second rotating mechanism for rotating the second rotating body, and a second rotating mechanism coupled to the second slider and screwed into the second female screw hole And an external thread. Thus, the vertical position of the second slider can be finely adjusted, so that the bottom dead center position and the stroke length of the slide can be finely adjusted.

In a preferred embodiment, the first and second rotating bodies are worm wheels, and the first and second rotating mechanisms are a worm screw that meshes with the worm wheel and a sprocket attached to the worm screw. including.

[0017] The press may further include an equilibrium device connected to the other link of the link mechanism of the motion conversion device to balance an imbalance force caused by the vertical motion of the slide. Thus, vibration caused by the vertical movement of the slide is reduced.

In the case where the press includes an equilibrium device, the other link of the link mechanism is pivotally connected to the slider at a central portion in the longitudinal direction, and is pivotally connected to the equilibrium device at one end. An end can be pivotally connected to the one link. In this way, the balance device and the slide can be moved by the same link mechanism.
Since it is moved in the vertical direction with the phase shifted by 0 degrees, the vibration caused by the vertical movement of the slide is further reduced.

The balancing device includes a balancing weight located above the link mechanism and the crankshaft and arranged on the frame so as to be able to reciprocate up and down, and a balancing weight for moving the balancing weight in a direction opposite to the slide. And a connecting link for pivotally connecting the counterweight to the other link of the link mechanism. As a result, the vertical movement between the balance weight and the slide is reversed, and the unbalance force caused by the vertical movement between the slide and the balance weight is mutually reduced.

[0020] The balancing device may further comprise at least one weight guide for regulating the reciprocating movement of the balancing weight in the vertical direction. As a result, the reciprocating movement of the balance weight is restricted downward, so that the reciprocating movement of the balance weight in the horizontal direction is prevented, and the vibration of the press machine in the horizontal direction due to the movement of the balance weight is prevented.

[0021]

1 to 7, a press machine 10 includes a lower frame 12 on which a lower die is placed, and an upper frame 14 supported by the lower frame 12. As shown in FIG.
The crankshaft 16 is rotatably supported by the upper frame 14 about an axis extending in the horizontal direction, and supports a flywheel 18 (see FIG. 3) at an end. The slide 20 for assembling the upper mold is attached to the lower ends of a pair of rods 22 that penetrate the lower end of the upper frame 14 movably in the vertical direction.

FIG. 2 shows the rotation axis 24 of the main shaft of the crankshaft 16 and the eccentric axis 26 of the eccentric shaft.

The rods 22 extend upwardly in parallel from both ends of the slide 20 and have a motion converting device 30 for converting the rotational motion of the crankshaft 16 into a reciprocating motion in the vertical direction.
, And are synchronously moved in the vertical direction by the corresponding motion conversion device 30. As a result, the slide 20 is reciprocated vertically with respect to the lower frame 12.

Each of the motion converting devices 30 has a first link mechanism 32 having a pair of first links 32a and 32b connected so as to be capable of bending and extending, and a first link mechanism 32 arranged on the upper frame 14 so as to be vertically movable. 1 slider 34 and a first position adjusting device 36 for adjusting the position of the first slider 34 in the vertical direction.

The first link mechanisms 32 are connected to the crankshaft 1
The first link mechanism 32 is connected to the eccentric shaft portion of the crankshaft 16 by the connecting device 38 so that the first link mechanism 32 bends and extends with the rotation of the sixth link 6.

In each of the first link mechanisms 32, one first link 32a is pivotally connected at one end to the rod 22 by a pivot 40, and the other first link 32b is pivoted at one end. The first slider 34 is pivotally connected to the lower end of the first slider 34 by 42. Both first links 32a, 32b are pivotally connected at the other end by a pivot 44.

Each first slider 34 is mounted on the upper frame 1
The first guide portion 46 formed on the upper frame 14 is moved such that the direction of movement thereof is in the vertical direction.
And has a first male screw 48 extending upwardly at the top.

Each of the first position adjusting devices 36 includes a first worm wheel 50 supported on the upper frame 14, a first worm screw 52 meshing with the first worm wheel 50, and a first worm screw 52. And a first proket 54 attached to the second proket 52.

Each first worm wheel 50 can rotate around an axis extending in the vertical direction, but cannot move two-dimensionally in a horizontal plane and cannot move in the vertical direction. Further, each first worm wheel 50 has a first female screw hole which is screwed with the male screw 48 of the first slider 34.

In each first position adjusting device 36, the first
When the first sprocket 54 is rotated, the first worm screw 52 is rotated, so that the first worm wheel 50 meshing with the first worm screw 52 is rotated. Thus, the first slider 3 having the first male screw 48 screwed into the first female screw hole of the first worm wheel 50
4 is moved upward or downward.

However, since both first sprockets 54 are connected by a chain or the like and are rotated synchronously, both first worm wheels 50 are synchronously rotated. As a result, the first sliders 34 are vertically displaced in synchronization with each other.

The connecting device 38 includes a pair of second link mechanisms 56 having a pair of second links 56a and 56b connected so as to be able to bend and extend, and a pair of second link mechanisms 56 disposed on the upper frame 14 so as to be vertically movable. A second slider 58, a second position adjusting device 60 for adjusting the position of the second slider 58 in the vertical direction, and a second link mechanism 56 for bending and extending the second link mechanism 56 with the rotation of the crankshaft 16. A connecting piece 62 for connecting the second link mechanism 56 to the eccentric shaft portion of the crankshaft 56 and a connecting link 64 for connecting each second link mechanism 56 to the first link mechanism 32 are provided.

The two second links 56a are pivotally connected at one end to the second sliders 58 by pivots 66, and the second links 56b are pivotally connected at the other end to the pivots 6a.
8, the connecting piece 62 and the pair of third sliders 72 are pivotally connected to each other. In each of the second link mechanisms 56, the second links 56a and 56b are connected to the second link 56.
a and the other end of the second link 56b is pivotally connected by a pivot 70.

The connecting piece 62 is connected to the eccentric shaft of the crankshaft 16. Each connection link 64 is pivotally connected to the other end of the second link 66 a by a pivot 74, and is also pivotally connected to the first link mechanism 32 by a pivot 46.

The movement of the second and third sliders 58 and 72 with respect to the upper frame 14 is regulated by a second guide portion 78 formed on the upper frame 14 such that the movement of the sliders is in the vertical direction.

The second position adjusting device 60 is supported by the upper frame 14 and a bifurcated bracket 80 pivotally connected to the second links 56b and the second sliders 58 by pivots 66. Second warm wheel 8
2, a second worm screw 84 meshing with the second worm wheel 82, and a second sprocket 86 attached to the second worm screw 84.

The second worm wheel 84 can rotate around an axis extending in the vertical direction, but cannot move two-dimensionally in a horizontal plane and in the vertical direction. The second worm wheel 86 is connected to a second male screw 88 formed at the lower end of the bracket 80 by a second worm wheel 86.
Female screw holes.

In the illustrated example, the pivots 66 and 68 are provided such that their pivots coincide with an axis 90 extending vertically through the rotation axis of the crankshaft 16. For this reason, the two second link mechanisms 56 are symmetrically arranged with respect to the axis 90. Also, both motion conversion devices 30 are:
The two second link mechanisms 56 and the axis 90 are symmetrically arranged.

In the illustrated example, the two second links 56a are directly connected to the connecting piece 62 and the third slider 72, but the two second links 56a are connected to the connecting piece 62 and the third slider 72. You may connect only to one side. Axis 6
6, 68 may not be arranged as described above.

First and second worm wheels 50, 8
Instead of 2, other flat rotating bodies such as gears, ratchets, sprockets, and timing pulleys may be used. Also,
Instead of the first and second worm screws 52 and the first and second sprockets 54 and 86, depending on the rotating body,
A rotating mechanism including other members such as a ratchet, a chain, a timing pulley, and a timing belt may be used.

In the press machine 10, the first slider 3
4 is not moved unless the first worm wheel 50 is rotated. Therefore, in the first link mechanism 32, the pivot 40 acts as a movable fulcrum, but the pivot 42
Acts as a fixed fulcrum that is position adjustable.

On the other hand, the third slider 72 is reciprocated in the same direction by the reciprocating movement of the connecting piece 62 in the vertical direction as the crankshaft 16 rotates.
However, the second slider 58 and the bracket 80 are not moved unless the second worm wheel 82 is rotated. For this reason, in the second link mechanism 56, the pivot 68 acts as a movable fulcrum, and the pivot 66 acts as a fixed fulcrum whose position can be adjusted.

Thus, both second link mechanisms 56 are
Third slider 7 due to rotational movement of crankshaft 16
Bending and stretching movements are synchronized by the up and down movement of 2. The bending movement of each second link mechanism 56 reciprocates the pivot 44 in the horizontal direction. When the pivot 44 is reciprocated in the horizontal direction,
Since the first link mechanisms 32 bend and extend in synchronization with each other, the pivot 40 is moved up and down. As a result, the rod 22 and the slide 20 reciprocate vertically.

The vertical movement of the slide 20 is
Are reciprocated in the vertical direction by the synchronized bending and extension movements of the pair of first link mechanisms 32 and the synchronized bending and extension movements of the pair of second link mechanisms 56, so that the stabilization is significantly stabilized.

When the position of the first slider 34 (the pivot 42) is moved upward or downward irrespective of the rotation of the crankshaft 16, the first link mechanism 32 is displaced upward or downward. The connection state of the second link mechanisms 32 and 56 changes, whereby the instantaneous speed (stroke curve of the vertical movement) at each point in the vertical movement of the slide 20 changes.

For this reason, by rotating the first worm wheel 50 to move the position of the first slider 34 (the pivot 42) upward or downward, the vertical movement of the slide 20 can be performed with substantially the same stroke length. Can adjust and change the instantaneous speed (slide stroke curve) at each time point. In particular, the speed change near the bottom dead center becomes slower as the first slider 34 (the pivot 42) is higher.

For example, when the fixed point (the pivot 42) of the first link mechanism 32 is moved upward to set the distance A to the state shown in FIG. 1, the stroke curve of the vertical movement of the slide 20 is shown in FIG. Becomes a curve 92 shown by a solid line. In contrast,
When the fixed side fulcrum (the pivot 42) of the first link mechanism 32 is moved downward to set the distance A to the state shown in FIG.
The stroke curve of the vertical movement of the slide 20 is a curve 94 shown by a dotted line in FIG.

Therefore, by raising the fixed-side fulcrum (the pivot 42) of the first link mechanism 32, the speed change near the bottom dead center can be slowed and precision machining can be performed at a low speed. By lowering the 34 (the pivot 42), the speed change near the bottom dead center can be made faster to perform high-speed machining. As is clear from FIG. 8, the stroke lengths of both are almost the same.

When the second slider 58 (the pivot 66) is moved upward irrespective of the rotation of the crankshaft 16, the second
Since the bending angle of the link mechanism 56 becomes smaller and the bending angle of the first link mechanism 32 becomes larger, the slide 20 is displaced downward. On the other hand, when the second slider 58 (the pivot 66) is moved downward, the bending angle of the second link mechanism 56 is increased, and thereby the bending angle of the first link mechanism 32 is reduced. 20 is moved upward.

That is, the second slider 58 (the pivot 6
When 6) is moved upward or downward, since the position of the third slider 72 (the pivot 68) in the vertical direction does not change, the bending angle of the second link mechanism 56 changes,
The bending range does not move vertically. Therefore, the second
By rotating the worm wheel 82 to adjust the position of the fixed side fulcrum (the pivot 66) of the second link mechanism 56, the position of the bottom dead center and the stroke length of the slide 20 can be adjusted.

By rotating the worm wheels 50 and 82 screwed with the external threads 48 and 88 of the sliders 34 and 58 like the position adjusting devices 36 and 60, the position of the fixed-side fulcrum of the second link mechanism 56 is adjusted. If it is displaced, the fixed fulcrum of the link mechanisms 32, 56 (sliders 34, 5
Since the position 8) can be finely adjusted, the stroke curve, the bottom dead center, and the stroke length of the slide 20 can be finely adjusted according to the type of press working.

If the movement of the sliders 34, 58, 72 is restricted in the vertical direction by the guide portions 46, 78,
Since the movement of the sliders 34, 58, 72 with respect to the frame 14 is stabilized, the bending and extending movements of the link mechanisms 32, 56 are stabilized, and the vertical movement of the slide 20 is stabilized.

Referring to FIG. 9 and FIG.
00 further includes a balancing device 102 that balances unbalance forces due to vertical movement of the slide 20. The balancing device 102 includes a balancing weight 104 arranged on the frame 14 so as to be able to reciprocate up and down. The reciprocating movement of the balance weight 104 is regulated in the vertical direction by a plurality of weight guides 106.

The balance weight 104 is connected to the link mechanisms 32, 58.
And above the crankshaft 16. The counterweight 104 also has an extension 108 extending downward from both ends of the main body, and is pivotally connected to the first link 32a of the first link mechanism 32 by a connection link 110 at the extension 108. Have been.

In the case of the press machine 100, the first link 32
a has an extension extending further from the side of the pivot 42, and is connected at its end to the connection link 110 by the pivot 112. Axis 42 includes axes 44 and 112
It is arranged at the center position between. Therefore, Axis 4
The momentum of 4 and 112 is the same, but the direction of motion is reversed.

The connecting ring 110 forms a third link mechanism together with the first link 32 a, and is connected to the extension 108 of the counterweight 104 by a pivot 114 at an end opposite to the pivot 112.

The first link mechanism 32a and the connecting link 11
0 is the first link mechanism 3
2 with respect to the first link mechanism following the bending and stretching movement of the second link mechanism.
Bending and stretching movements with phase shift. Thereby, the balance weight 10
4 reciprocates in the vertical direction with a phase shift of 180 degrees with respect to the slide 20.

Therefore, the vibration caused by the vertical movement of the slide 20 is offset by the vertical movement of the balance weight 104 shifted by 180 degrees. At this time, since the movement of the balance weight 104 is regulated in the vertical direction by the weight guide 106,
The reciprocating movement of the balance weight 104 in the horizontal direction is prevented, and the vibration of the press machine in the horizontal direction due to the movement of the balance weight 104 is prevented.

The present invention is not limited to the above embodiment.
For example, only one set of link mechanisms may be used as the first and second link mechanisms 32 and 56, respectively. In this case, the counterweight 104 is formed by a plurality of links pivotally supported by the frame 14 so as to be positioned below the horizontal center portion. At the link mechanism 32.

The first and second link mechanisms 32, 5
As 6, the links 32b and 56b may not be used in either case where only one set of link mechanisms is used or where only two sets of link mechanisms 32 and 56 are used.

Further, instead of the connecting device 38 as in the illustrated example, another connecting device may be used to transmit the rotational motion of the crankshaft 16 to the motion converting device 30.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a press according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a motion converting portion of the press machine of FIG. 1, and is a view in a state where a first slider is lowered as compared with FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is a sectional view taken along line 4-4 in FIG.

FIG. 5 is a cross-sectional view taken along line 5-5 in FIG.

FIG. 6 is a cross-sectional view taken along line 6-6 in FIG.

FIG. 7 is a sectional view taken along line 7-7 in FIG. 1;

FIG. 8 is a view showing a stroke line of a slide in the press machine shown in FIG.

FIG. 9 is a cross-sectional view similar to FIG. 2, showing another embodiment of the press according to the present invention.

FIG. 10 is a cross-sectional view taken along line 10-10 in FIG.

[Explanation of symbols]

 10, 100 Press machine 12, 14 Frame 16 Crankshaft 18 Flywheel 20 Slide 22 Rod 30 Motion conversion device 32 First link mechanism 32a, 32b First link 34 First slider 36 Position adjustment mechanism 38 Connecting device 46 , 78 Guide part 48 First male screw 50 First worm wheel (first rotating body) 52 First worm screw (First rotating mechanism) 54 First sprocket (First rotating mechanism) 56 Second Link mechanism 56a, 56b second link 58 second slider 60 second position adjustment mechanism 62 connecting piece 62 connecting link 72 third slider 80 bracket 82 second worm wheel (second rotating body) 84 second No. 2 worm screw (second rotation mechanism) 86 Second sprocket (second rotation mechanism) 88 External thread 102 balancing device 104 balancing weight 106 weight guide 108 extension 110 connecting links

Claims (7)

[Claims] 1. A frame, a slide arranged on the frame so as to be able to move up and down, a crankshaft supported by the frame, and a motion conversion device for converting a rotational motion of the crankshaft into a vertical motion of the slide. Wherein the motion conversion device includes a link mechanism having a pair of links connected so as to be able to bend and extend, wherein one link is connected to the slide and a link mechanism pivotally connected to the other link of the link mechanism. And a position adjusting device for adjusting the position of the slider in the vertical direction, wherein the link mechanism bends and extends with the rotation of the crankshaft. A press connected to the crankshaft to perform 2. The rotating device according to claim 1, wherein the position adjusting device is a disk-shaped rotating body that is rotatable around an axis extending in the vertical direction and is immovable in the vertical direction, and has a female screw hole. The press according to claim 1, further comprising: a rotating mechanism configured to rotate the rotating body, wherein the slider has a male screw portion screwed into the female screw hole. 3. The press according to claim 1, wherein the frame has a guide portion for regulating a reciprocating movement of the slider in a vertical direction. 4. A pair of said motion converting devices each comprising said link mechanism, said slider and said position adjusting device, wherein both link mechanisms are commonly connected to said crankshaft by said connecting device. The press according to any one of claims 1 to 3, wherein the presses are driven synchronously. 5. A second connecting device for connecting the motion converting device to the crankshaft, wherein the connecting device includes a second link having a pair of second links connected to be able to bend and extend.
A link mechanism, a second slider pivotally connected to one of the second links and arranged on the frame so as to be movable in the vertical direction, and a second slider for adjusting the position of the second slider in the vertical direction. 5. The position adjusting device according to claim 1, further comprising: a connecting piece that connects the second link mechanism to the crankshaft so as to cause the second link mechanism to bend and extend with the rotation of the crankshaft. 6. A press according to any one of the preceding claims. 6. The motion converting device according to claim 1, further comprising a balancing device connected to the other link of the link mechanism of the motion converting device to balance an unbalance force caused by the vertical motion of the slide. The press according to claim 1. 7. The other link of the link mechanism of the motion conversion device is pivotally connected to the slider at a central portion in the longitudinal direction, and is pivotally connected to the balancing device at one end, and further to the other end. 7. The press according to claim 6, wherein the press is pivotally connected to the one link.