JP2002144095A - Press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the stroke length of a slide changeable and to make a higher speed possible in spite of a press machine which moves reciprocally two kinds of connections extending nearly horizontally in the reverse direction from a crank shaft at a phase difference of 180 deg.. SOLUTION: The press machine 10 includes a crank shaft 16 which is rotatably born at a frame 14, the connections which are the connections 24a and 24b connected to the crank shaft and moved back and forth, and are guided at their front end side to a horizontal direction intersecting with the axis of rotation of the crank shaft, an oscillating body which is the oscillating body 32b having at first, second and third arm regions at equal angle intervals around the axis extending in parallel with the axis of rotation of the crank shaft and of which the first arm region is connected to the fronts of the connections and the second arm region is connected to the slide and a position regulating mechanism 36 which is connected to the third arm region of the oscillating body in order to regulate the rotating angle position of the oscillating body around the pivot connecting point of the connections and the oscillating body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to two kinds of connections extending almost horizontally from the crankshaft in opposite directions.
The present invention relates to a press that moves a slide up and down by reciprocating with a phase difference of degrees.

[0002]

2. Description of the Related Art Two connections connected to a crankshaft extend substantially horizontally in opposite directions from the crankshaft so as to reciprocate at a phase difference of 180 degrees. Various presses for moving a slide in the vertical direction have been proposed and put to practical use (for example, Japanese Patent Application Laid-Open No. HEI 8-11802). This type of press has the advantage that the two connections are opposed to each other, so that the inertia of both connections are effectively reduced to each other and the weight balance is good as compared to the toggle press and the crank press.

[0003] Two connections not supported by the crankshaft are horizontally extended in opposite directions to the left and right, a slider is assembled at the tip of each connection and guided horizontally, and both connections are reciprocated with a phase difference of 180 degrees. Japanese Patent Laid-Open No. 165900/1990 discloses a press for moving the slide vertically. This press not only has the same advantages as the press described above,
There is an advantage that it does not require a quasi-linear motion mechanism and is simple.

[0004]

However, none of the above presses can change the stroke length of the slide. Also, in all presses, the slide is moved up and down by using a toggle mechanism, so that the slide speed is greatly reduced near the bottom dead center compared to the crank press, and as a result, the slide near the bottom dead center is reduced. Is long, whereas the slide stroke near top dead center is short.

[0005] In the above press machine, high-precision machining is possible because the stroke near the bottom dead center is long, but the material is gold because the stroke near the top dead center is short. The time allowed to be sent into the mold is reduced, which hinders speedup for products that do not require very high precision. Further, in a press machine using a toggle mechanism, a change in slide acceleration near the top dead center is large, which also hinders speeding up.

An object of the present invention is to provide a press machine which reciprocates two types of connections extending substantially horizontally in opposite directions from a crankshaft with a phase difference of 180 degrees.
Another object of the present invention is to make it possible to change the stroke length of a slide and to increase the speed.

[0007]

A press machine according to the present invention comprises:
A crankshaft rotatably supported on the frame; 180
First and second guides which are connected to the crankshaft in a state of being driven by a phase difference of degrees and extend substantially horizontally in opposite directions, and are guided at the leading end side in a horizontal direction intersecting the rotation axis of the crankshaft. A connection and first and second rockers respectively corresponding to the first and second connections, wherein at least the first, second and third arm regions are parallel to the rotation axis of the crankshaft. First and second rockers having equiangular spacing about an extending axis, a first arm region pivotally connected to a tip of a corresponding connection and a second arm region connected to a slide. And a third arm area of the oscillator for adjusting a rotation angle position of the oscillator around a pivot connection point between the connection and the oscillator, which is a pivot connection point extending parallel to the rotation axis. pivot And a connecting position adjusting mechanism.

When the crankshaft is rotated, both connections are reciprocated in the horizontal direction with a phase difference of 180 degrees, so that both rockers are rocked in opposite phases around the pivot connection point to the position adjusting mechanism. , Whereby the slide is moved up and down.
Therefore, the weight balance can be increased and the speed can be increased without using a toggle mechanism.

When the rotation angle position of the rocking body around the pivot connection point is changed by the position adjusting mechanism, the size of the rocking angle range of both rocking bodies is changed, thereby changing the stroke length of the slide. You.

As described above, according to the present invention, despite the fact that the two types of connections extending substantially horizontally in the opposite direction from the crankshaft are reciprocated with a phase difference of 180 degrees and the press machine has a good weight balance. In addition, the stroke length of the slide can be changed, and the speed can be increased.

[0011] The press further includes a first and a second slider respectively corresponding to the combination of the connection and the rocking body and connected to the corresponding connection and the first arm area of the rocking body. And each slide may be disposed on the frame to guide the tip of the corresponding connection in a horizontal direction. By doing so, the movement of the tip of each connection becomes smooth, and the vertical movement of the slide is stabilized.

[0012] The press machine is further provided with an equilibrium device having an equilibrium weight arranged on the frame so as to be able to move up and down. Can be included. In this case, since the vertical movement of the slide and the balance weight is opposite to each other, the unbalance force due to the vertical movement of the slide and the balance weight is mutually reduced.

The balance weight is located above the crankshaft and is arranged on the frame so as to be able to reciprocate up and down. The balance device is further connected to the first oscillator at a lower end side, and A first connector connected to the counterweight at the upper end, and a second connector connected to the second oscillator at the lower end and connected to the counterweight at the upper end. it can.

Each rocker may further have a fourth arm region, and the link may be connected to a corresponding fourth arm region of the rocker. That way,
The vertical movement of the balance weight with respect to the vertical movement of the slide is more stabilized.

The position adjusting mechanism is disposed on the frame so as to be movable in one direction, and is connected to the second arm area of each of the rocking members, and is rotatable about an axis extending in the one direction. And a disk-shaped rotating body that is immovably arranged in the frame in the one direction, and a rotating mechanism that rotates the rotating body, and one of the slider and the rotating body has a female screw hole. The other of the slider and the rotating body may have a male screw portion screwed into the female screw hole. Accordingly, 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.

Instead of the above, the position adjusting mechanism is a first and a second slider corresponding to the first and the second swinging members, and is arranged on the frame so as to be movable in one direction. A first and a second slider connected to a second arm area of an oscillating body; and a disk disposed on the frame so as to be rotatable about an axis extending in the one direction and immovable in the one direction. A rotating body, and a rotating mechanism for rotating the rotating body. One of the slider and the rotating body has a female screw hole, and the other of the slider and the rotating body is screwed into the female screw hole. It can have mated male threads. Also in this case, since the position of the slider in the vertical direction can be finely adjusted, 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.

[0017] The press may further include one or more weight guides for regulating the vertical movement of the counterweight in the vertical direction. By doing so, the reciprocating motion of the balance weight in the horizontal direction is prevented, so that the vibration of the press machine in the horizontal direction due to the reciprocation of the balance weight can be prevented.

The first arm region of each oscillator extends downward from the tip of the corresponding connection, and the position adjusting mechanism is disposed at a height between the crankshaft and the slide. Good.

In a preferred embodiment, the crankshaft has first and second eccentrics eccentric in opposite directions about its axis of rotation, wherein the first and second connections are respectively: The first and second eccentric portions are pivotally connected.

[0020]

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.
The crankshaft 16 is supported by the upper frame 14 so as to be rotatable about an axis extending in the horizontal direction, and is rotated by the rotation of a flywheel 18 shown in FIG.
The flywheel 18 is rotated by a motor (not shown) such as an electric motor.

The crankshaft 16 has eccentric portions 16a and 16b which are eccentric in opposite directions and shifted by 180 degrees around the rotation axis. In the illustrated example, the two eccentric portions 16b
Are formed at intervals in the longitudinal direction of the crankshaft 16 with the eccentric portion 16a therebetween.

The so-called slide 20 for supporting the upper mold is
The lower end of the upper frame 14 is assembled to a pair of connecting rods that penetrate the lower end of the upper frame movably in the vertical direction, that is, the lower ends of the plungers 22. Both plungers 22 are slide 2
0 extend upward from both ends in parallel, and reciprocate up and down with the rotation of the crankshaft 16. As a result, the slide 20 is reciprocated in the vertical direction.

The eccentric portions 16a and 16b respectively have
Connections 24a and 24b are pivotally connected to extend substantially horizontally in opposite directions. As a result, the connections 24a and 24b are reciprocated substantially horizontally in opposite directions with a phase difference of 180 degrees.
In the illustrated example, two connections 24b are provided.

The connection 24a is bifurcated from the base connected to the eccentric portion 16a.
The distal end portion is pivotally connected to the pair of slides 26a via 8a. On the other hand, the two connections 24b extend horizontally in parallel from the base connected to the eccentric portion 16b, and have their distal ends connected to the pair of sliders 2 via the pivot 28b.
6b is pivotally connected.

Moving members or slides 26a and 26b
Are slidably disposed on guide portions 30a and 30b formed on the frame 14 to guide the distal ends of the connections 24a and 24b in the horizontal direction, respectively. Thereby, the movement of the distal ends of the connections 16a and 16b is smooth, and the vertical movement of the slide 20 is stabilized.

The pivots 28a and 28b pivotally support rocking levers or rockers 32a and 32b, respectively. Each of the oscillators 32a and 32b is formed in a cross shape having first, second, third and fourth arm regions at equal angular intervals around an axis extending parallel to the rotation axis of the crankshaft. And extends downward from corresponding sliders 26a and 26b.

The first arm regions of the rockers 32a and 32b are provided at their distal ends with corresponding pivots 28a and 28a, respectively.
b are pivotally connected to the distal ends of the corresponding connections 24a and 24b and the corresponding slides 26a and 26b. The arm regions of the oscillators 32a and 32b have their distal ends connected to the plunger 22 by connectors, that is, connecting members 34a and 34b, respectively.

The third arm regions of the oscillators 32a and 32b respectively include oscillators 32a and 32b around pivots 28a and 28b acting as pivot connection points between the connections 24a and 24b and the oscillators 32a and 32b.
Position adjustment mechanism 36 for adjusting the rotation angle position of 2b
The distal end is connected to.

Further, the fourth arm regions of the oscillating bodies 32a and 32b have their distal ends connected to the connecting bodies 38a and 38a, respectively.
8b, the slide 20 is connected to a balancing device 40 for balancing vibrations generated due to the vertical movement of the slide 20.

The position adjusting mechanism 36 includes a pair of sliders 42a, 4
2b, a disk-shaped rotator 44 disposed on the frame 14 so as to be rotatable about an axis extending in the horizontal direction and immovable in the horizontal direction, and a rotation mechanism 46 for rotating the rotator 46
And the sliders 42a and 42b
And two sets of connecting links 48a and 48b pivotally connected to the fourth arm area of the second arm 32b.

The sliders 42a and 42b are
Are spaced horizontally in between. Slider 42
One of the a and b and the rotating body 44 has a screw hole, and the other has a male screw portion screwed into the female screw hole. In the illustrated example, the sliders 42a and 42b have screw holes, respectively, and the rotating body 44 has male screw portions 50a and 50b.

The sliders 42a and 42b are respectively
The guide portions 52a and 52b formed on the frame 14 are slidably received in a horizontal direction and in opposite directions to each other. Further, the sliders 42a and 42b are respectively connected to connecting links 48a and 48b and sliders 56a and 56b slidably received in guide portions 54a and 54b formed in the frame 14 in a horizontal direction and in opposite directions to each other. They are connected by pivots 58a and 58b.

The connecting links 48a and 48b are each associated with a corresponding youdouba-3 by a pivot 60.
It is connected to the fourth arm regions 2a and 32b.
The externally threaded portions 50a and 50b are reverse-threaded so as to extend in opposite directions to each other.
The corresponding female screw holes 2b are also screw holes in opposite directions.

In the illustrated example, the rotating body 44 is a worm wheel having a plurality of teeth on its outer periphery, and the rotating mechanism 46 is a worm screw that meshes with the worm wheel. The rotation mechanism 46 is rotated by a mechanism such as a servomotor that uses an electric motor (not shown) as a drive source.

The balancing device 40 includes connecting members 38a and 38b.
In addition, the frame 1 above the crankshaft 16
4, a balance weight 62 arranged to be able to reciprocate up and down.
It has. The connecting bodies 38a and 38b are respectively
At its lower end, it is pivotally connected to the fourth arm regions of the rockers 32a and 32b, and at its upper end it is pivotally connected to the counterweight 62.

The balance weight 62 is restricted from moving up and down by a plurality of weight guides 64 provided on the frame 14. Thereby, the balance weight 62 in the horizontal direction is obtained.
Of the press machine in the horizontal direction due to the reciprocating movement of the balance weight 62 is prevented.

In the pre-like 10, the pivot connecting or supporting the plurality of members pivotally extends in the horizontal direction parallel to the rotation axis of the crankshaft 16. Therefore, the pivotal movement of the members interconnected by or supported by each pivot is a movement about an axis extending horizontally.

The rotation of the flywheel 18 corresponds to the crankshaft 1
When the crankshaft 16 rotates, the pair of one connection 24a and the slide 26a
The pair of the other connection 24b and the slider 26b is 1
It is reciprocated right and left with a phase shift of 80 degrees. As a result, both the rockers 32a and 32b are rocked synchronously around the pivot connection point to the position adjustment mechanism and with a phase shift of 180 degrees, so that the slide 20 reciprocates in the vertical direction. Therefore, the weight balance can be increased and the speed can be increased without using a toggle mechanism.

The rocking motion of both rocking bodies 32a and 32b is
The balance weight 62 is transmitted to the balance weight 62 by the coupling bodies 38a and 38b, and moves the balance weight 62 up and down with a phase difference of 180 degrees from the up and down movement of the slide 20. Thereby, the slide 20
The vertical movement between the slide 20 and the balance weight 62 is opposite to each other, and the unbalance force caused by the vertical movement between the slide 20 and the balance weight 62 is mutually reduced.

When the rotating mechanism 46 is rotated, the rotating body 44
Is rotated, the male screw portion 50 screwed with the rotating body 44
a and 50b are reversed in the left-right direction, and finally the sliders 42a and 42b are reversed in the left-right direction.
As a result, the rotational angular positions of the oscillators 32a and 32b around the pivots 28a and 28b are changed.

As described above, regardless of the rotation of the crankshaft 16, the rocking body 32 around the pivots 28a and 28b
When the rotation angle positions of the a and 32b are changed,
Since the swing angle ranges of 2a and 32b are changed, the position of the bottom dead center and the stroke length of the slide 20 can be adjusted by rotating the rotating body 44.

In the position adjusting mechanism 36, the slider 42
Since the rotating members a and 42b are screwed to the rotating body 44 and moved in the horizontal direction by one pitch by rotating the rotating body 46 once, the horizontal positions of the sliders 42a and 42b are finely adjusted. Is done. Thereby, the stroke length of the slide 20 can be more finely adjusted according to the type of press working.

In the above embodiment, the balance device 40 is provided, but such a balance device 40 is not necessarily required. Instead of moving the sliders 42a and 42b in the horizontal direction, the sliders 42a and 42b may be moved in a direction other than the horizontal direction, for example, in the vertical direction. Further, instead of connecting the oscillators 32a and 32b to separate sliders 42a and 42b,
2a and 32b may be connected to a common slider.

Referring to FIG. 8, the press 70 does not include the balancing device 40. Therefore, both oscillators 32a and 32b are formed in a T-shape (or Y-shape) by the three arm regions.
(Shape). The press machine 70 includes both swinging bodies 32.
a and 32b are connected to a common slider 42, and the slider 42 is moved vertically by a rotating body 44. For this reason, in the press 70, the male screw portion 50 is formed in the slider 42, and the female screw hole screwed with the male screw portion 50 is formed in the rotating body 44.

In the press 70, the position adjusting mechanism 36
Are the members 44, 46, 48a, 48 in the above embodiment.
b, 50a, 50b, 52a, 52b, 54a, 54b
And members 44, 46, 48, 5 of the same kind as 56a, 56b
0, 52, 54 and 56.

The press 70 has the same functions and effects as those of the press 10 except for the functions and effects produced by the balancing device.

If a position adjusting mechanism having a worm wheel and a worm screw is used as the slider moving means,
Since the amount of movement of the sliders 32a and 32b is small with respect to the amount of rotation of the rotating body 44, both the bottom dead center position and the stroke length can be finely and accurately adjusted. However, another position adjusting mechanism including a lever mechanism or the like may be used as the slider moving means.

The present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing one embodiment of a press machine of the present invention.

FIG. 2 is an enlarged sectional view of an upper portion of the press shown in FIG.

FIG. 3 is an enlarged cross-sectional view taken along line 3-3 in FIG.

FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG.

FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG.

FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 1;

FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG.

FIG. 8 is a cross-sectional view showing another embodiment of the press according to the present invention, and is a cross-sectional view showing a portion similar to FIG.

[Explanation of symbols]

 10, 70 Press machine 12, 14 Frame 16 Crankshaft 18 Flywheel 20 Slide 22 Plunger 24a, 24b Connection 26a, 26b Slider 28a, 28b Axis 30a, 30b Slider guide 32a, 32b Oscillator 34a, 34b Connecting member 36 Position Adjusting Mechanism 38a, 38b Linked Body 40 Balancing Device 42a, 42b Slider 44 Rotating Body 46 Rotating Mechanism 48a, 48b Linking Link 50, 50a, 50b Male Thread 52, 52a, 52b Slider Guide 62 Balance Weight 64 Weight Guide

Claims (8)

[Claims] 1. A crankshaft rotatably supported by a frame, connected to the crankshaft so as to be driven by a phase difference of 180 degrees, extending substantially horizontally in opposite directions to each other, and having the tip end side connected to the crankshaft. First and second connections guided in a horizontal direction intersecting the rotation axis of the first and second oscillators respectively corresponding to the first and second connections; Second and third arm regions are equiangularly spaced about an axis extending parallel to the axis of rotation of the crankshaft, the first arm region being pivotally connected to a tip of a corresponding connection and having a second arm region. A first and a second rocking body having a second arm region connected to a slide; and a pivot connecting point between the connection and the rocking body, the pivot being connected around a pivot connecting point extending parallel to the rotation axis. And a position adjusting mechanism pivotally connected to a third arm region of the rocking body to adjust a rotation angle position of the moving body. 2. The apparatus further includes first and second sliders respectively corresponding to a combination of the connection and the oscillating body and connected to a corresponding connection and a first arm region of the oscillating body. The press according to claim 1, wherein each slider is disposed on the frame to guide a tip of a corresponding connection in a horizontal direction. 3. A balancing device comprising a balancing weight disposed on the frame so as to be vertically movable, the balance being connected to the bell crank so as to vertically move with a phase difference of 180 degrees from the vertical movement of the slide. The press according to claim 1 or 2, comprising a balancing device. 4. The equilibrium weight is located above the crankshaft and is reciprocally movable in the frame in the vertical direction. The equilibrium device is further connected to the first oscillator at a lower end side. A first connecting body connected to the counterweight at the upper end and a second connector connected to the second oscillator at the lower end and connected to the counterweight at the upper end. The press according to claim 3. 5. The press according to claim 4, wherein each rocker further has a fourth arm region, and wherein the link is connected to a fourth arm region of a corresponding rocker. 6. A position adjustment mechanism, comprising: a slider disposed on the frame so as to be movable in one direction and connected to the second arm regions of both rockers; and a rotation mechanism about an axis extending in the one direction. A disk-shaped rotator disposed on the frame as possible and immovable in the one direction, and a rotation mechanism for rotating the rotator, wherein one of the slider and the rotator has a female screw hole. The press according to any one of claims 1 to 5, wherein the other of the slider and the rotating body has a male screw portion screwed into the female screw hole. 7. The position adjustment mechanism according to claim 1, wherein the first and second position adjustment mechanisms include:
First and second sliders corresponding to the first oscillator, the first and second sliders being disposed on the frame so as to be movable in one direction, and being connected to the second arm area of the corresponding oscillator.
A slider, including a disk-shaped rotator disposed on the frame so as to be rotatable around the axis extending in the one direction and immovable in the one direction, and a rotation mechanism for rotating the rotator, The one of the slider and the rotating body has a female screw hole, and the other of the slider and the rotating body has a male screw part screwed into the female screw hole. The press described in 1. 8. A first arm region of each oscillator extends below a tip of a corresponding connection, and the position adjusting mechanism is disposed at a height between the crankshaft and the slide. The press according to any one of claims 1 to 7.