JP2001300797A - Slide adjusting device of forging press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide adjusting device of a forging press which can rapidly and smoothly adjust the shut height while a slide is stopped at a top dead center, and maintain the thickness accuracy of a forging at a predetermined value. SOLUTION: The forging press 1 with a lower portion of a connecting rod 30 to an upper portion of the slide 40 via an eccentric wrist pin 45 comprises a partial pinion 61 mounted on a lower portion of the eccentric wrist pin 45 and concentric with the eccentric wrist pin 45, a rack bar 62r having a rack 62 engaged with the partial pinion 61, and a hydraulic cylinder 63 for adjustment which reciprocates the rack bar 62r in the axial direction thereof. Since the hydraulic cylinder 63 for adjustment is put into the reciprocating motion, and the motion thereof rotates the eccentric wrist pin 45 directly via the engagement of the rack 62 with the partial pinion 61, the eccentric wrist pin 45 is rotated at a high speed, and thus, the shut height can be adjusted at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a slide adjusting device for a forging press. In recent years, a forging press with high productivity has been demanded in order to reduce the cost of forged products.
On the other hand, if the forged product is continuously pressed, various factors that affect the thickness dimension of the forged product such as billet temperature, number of shots, forging load, mold temperature, and temperature of each part of the frame change. Thickness accuracy deteriorates. Therefore, in order to keep the processing accuracy of the product constant, it is necessary to adjust the shut height while the top dead center is stopped during the press operation. However, when the press productivity is increased and the cycle time is shortened, the top dead center stop time is also shortened, so that a slide adjusting mechanism that operates at high speed is required. The present invention relates to a slide adjusting device suitable for such a highly productive forging press.

[0002]

2. Description of the Related Art As a conventional slide adjusting device for adjusting a shut height of a forging press, a typical one is as follows.
The following eccentric wrist pin type slide adjustment devices are available. Conventional example 1 described in Japanese Patent Publication No. 55-16739 discloses a worm tooth formed around the center of a wrist pin,
The worm is engaged with the worm teeth to rotate the worm. However, there is a problem that high-speed operation cannot be performed with this worm drive system. JP 57
In the related art 2 described in Japanese Patent Application Laid-Open No. 152339, the adjusting lever extending from the wrist pin is swung by a screw to rotate the wrist pin. There is a problem of being slow.

[0003]

SUMMARY OF THE INVENTION In view of the foregoing, according to the present invention, the shut height can be adjusted quickly and smoothly while the slide is stopped at the top dead center, and the thickness accuracy of the forged product is kept constant. It is an object of the present invention to provide a slide adjustment device that can perform the adjustment.

[0004]

A slide adjusting device for a forging press according to claim 1 is a forging press in which a lower part of a connecting rod and an upper part of a slide are connected by an eccentric wrist pin, and is attached to a lower part of the eccentric wrist pin. Further, it is characterized by comprising a partial pinion concentric with the eccentric wrist pin, a rack bar provided with a rack meshing with the partial pinion, and an adjusting hydraulic cylinder for reciprocating the rack bar in its axial direction. A slide adjusting device for a forging press according to a second aspect is characterized in that, in the invention according to the first aspect, a movement amount sensor for detecting a movement amount of the rack bar is provided. According to a third aspect of the present invention, there is provided a slide adjusting device for a forging press according to the first aspect, wherein a hold arm for tightening or releasing the eccentric wrist pin with respect to the upper portion of the slide is provided. A hold cylinder to be operated is provided.

According to the first aspect of the present invention, the adjusting hydraulic cylinder linearly moves, and the movement directly rotates the eccentric wrist pin through the engagement between the rack and the partial pinion, so that the eccentric wrist pin rotates quickly. . Therefore, while the slide is stopped at the top dead center, the shut height can be adjusted quickly and smoothly, and the thickness accuracy of the forged product can be kept constant. Since the amount of movement and the amount of rotation of the eccentric wrist pin are proportional,
By detecting the moving amount of the rack with the moving amount sensor,
The adjustment amount of the slide shut height can always be grasped. According to the third aspect of the invention, when the hold cylinder is operated to release the hold arm, the eccentric wrist pin becomes rotatable, so that the eccentric wrist pin can be quickly rotated. When the is tightened, the eccentric wrist pin does not rotate, so that the adjusted shut height does not go wrong during the press operation.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. First, before describing the slide adjusting device 50 of the present embodiment, a forging press 1 employing the slide adjusting device 50 will be described.

FIG. 2 is a schematic sectional view of the forging press 1.
In the figure, reference numeral 11 indicates a bed. The bed 11 supports the weight of the forging press and the load during forging. A crown 13 is provided above the bed 11. In this crown 13,
An eccentric shaft 20 described later is rotatably mounted via a sleeve 13S. Between the bed 11 and the crown 13, a pair of left and right columns 12, 12 is provided. The pair of left and right columns 12 and 12 support the crown 13 and maintain an interval between the bed 11 and the crown 13. Guide on the inner surface of each column 12
There are 12S each. This pair of guides 12S
, 12S are slides 40 to be described later inserted therebetween.
This guides the up and down movement. The bed 11, the column 12, and the crown 13 are connected to a tie rod 14
It is clamped and assembled by.

An eccentric shaft 20 is mounted horizontally on the crown 13, and supports 2 at both ends of the eccentric shaft 20.
1, 21 are rotatably supported by the crown 13 via a sleeve 13S. An eccentric portion 22 having a larger diameter than the support portion 21 is provided at a central portion of the eccentric shaft 20 in the axial direction.

The bases of a pair of left and right connecting rods 30, 30 are rotatably mounted on the eccentric portion 22 of the eccentric shaft 20 in parallel. The distal ends of the pair of left and right connecting rods 30, 30 are inserted into connecting rod connecting portions of the slide 40, and are connected to the slide 40 by eccentric wrist pins 45 described later.

The slide 40 is slidably inserted between the guides 12S of the pair of left and right columns 12, 12. A connecting rod connecting portion that is recessed downward is provided on the upper portion of the slide 40. A shaft insertion groove 40G is formed in the center of the upper surface of the connecting rod connecting portion of the slide 40 at right angles to the eccentric shaft 20.

The eccentric wrist pin 45 is a cylindrical shaft. Supporting portions 46, 46 are formed at both ends of the eccentric wrist pin 45, and a fixing portion 48 is formed at the center in the axial direction. The support portions 46, 46 and the fixing portion 48 are concentric shafts having the same diameter. The support portions 46, 46 and the fixing portion 48
A pair of left and right eccentric portions 47, 47 are formed between the two. The eccentric portions 47, 47 are formed concentrically,
The center of the axis is eccentric with respect to the center of the axis of the support portion 46 or the like. In addition, the diameter of the eccentric portions 47, 47 is
Greater than etc.

The support portions 4 at both ends of the eccentric wrist pin 45
6 and 46 are rotatably supported by a slide 40, and the pair of left and right connecting rods 30 and 30 are rotatably attached to the pair of left and right eccentric portions 47 and 47, respectively. The lower surface of the fixing portion 48 of the eccentric wrist pin 45 is in contact with the upper surface of the connecting portion of the slide 40.

With the above configuration, when the eccentric wrist pin 45 rotates, the vertical distance between the tip of the connecting rod 30 and the lower surface of the slide 40 changes. Therefore, if the eccentric wrist pin 45 is rotated, the shut height of the forging press 1 can be changed.

A slide adjusting device 50 according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic sectional perspective view of a slide adjusting device 50 of a forging press according to the present embodiment. The slide adjusting device 50 adjusts the shut height of the forging press 1 by rotating the eccentric wrist pin 45. As shown in FIG.
Is basically composed of an eccentric mechanism 60, a movement amount sensor 70, and a wrist pin hold unit 80.

First, the eccentric mechanism 60 will be described. A partial pinion 61 is attached to the center lower portion of the fixed portion 48 of the eccentric wrist pin 45. This partial pinion 61
Is mounted such that the center of its base circle coincides with the axial center of the fixing portion 48 of the eccentric wrist pin 45.

The partial pinion 61 includes a rack rod 62
Racks 62r are engaged. This rack bar 62
The rack 62r is a rod provided at the upper center in the axial direction, and is inserted horizontally into the shaft insertion groove 40G of the slide 40 (see FIG. 2). Further, the shaft portion sandwiching the rack 62r is slidably supported by the slide 40.

One end of the rack bar 62 is attached to a piston rod of a hydraulic cylinder 63 for adjustment. The adjusting hydraulic cylinder 63 is provided on the back of the slide 40,
Mounted horizontally. This adjusting hydraulic cylinder 6
Numeral 3 indicates that the piston rod moves forward and backward by hydraulic pressure.

Therefore, according to the eccentric mechanism 60, the piston rod of the hydraulic cylinder 63 for adjustment linearly moves, and the movement is directly transmitted to the rack 62r of the rack rod 62 and the partial pinion 61.
Since the eccentric wrist pin 45 is rotated through the engagement of the eccentric wrist, the eccentric wrist pin 45 can be rotated quickly. Therefore, the shut height can be adjusted at high speed.

Next, the movement amount sensor 70 will be described. A lower end of a fastening plate 71 is fixed to one end of the rack bar 62 of the eccentric mechanism 60. One end of a guide rod 72 is fixed to the upper end of the fastening plate 71. The guide rod 72 is provided in parallel with the adjusting hydraulic cylinder 63, and is slidably supported by the slide 40. The other end of the guide rod 72 projects outward from the back of the slide 40, and a rack is formed at the other end. The rack at the other end of the guide rod 72 includes
The pinions are engaged with each other, and the pinions are attached to a rotating shaft of a known rotary encoder 73.

For this reason, the guide rod 72 is connected to the fastening plate 7
1, the guide rod 72 is moved in the same direction by the same amount as the rack bar 62 of the eccentric mechanism 60.
It is detected as the amount of rotation of the rotary shaft of the rotary encoder 73 via the rack and the pinion. That is, the rack bar 6
2 can be detected as a rotation amount by the rotary encoder 73 via the guide rod 72.

Therefore, according to the movement amount sensor 70,
By detecting the amount of movement of the rack 62r of the rack bar 62 as the amount of rotation by the rotary encoder 73, the shut height adjustment amount of the slide can be always grasped.

Next, the wrist pin hold unit 80
Will be described. The wrist pin hold unit 80 includes a pin 81, a hold arm 82, and a hold cylinder 90.
It is basically composed of

The pin 81 is a shaft provided in parallel with the eccentric wrist pin 45 and fixed to the slide 40. One end of a hold arm 82 is attached to the pin 81 so as to swing up and down. This hold arm 82
Is provided above the eccentric wrist pin 45 between the pair of left and right connecting rods 30, 30. The hold arm 82 has an arc shape in a side view, and the lower surface thereof is in contact with the upper surface of the fixing portion 48 of the eccentric wrist pin 45.

A hold cylinder 90, which is a known hydraulic cylinder, is attached to the other end of the hold arm 82 so as to sandwich the eccentric wrist pin 45 with the pin 81. In the hold cylinder 90, the lower end of the cylinder body 91 is placed on the upper surface of the other end of the hold arm 82. A piston 92 is inserted into the upper portion of the cylinder body 91 in a liquid-tight manner. This piston 92 has
The upper end of the rod 93 is fixed. This rod 93
Are the lower end of the cylinder body 91 and the hold arm 8
The lower end is fixed to the slide 40 through the other end of 2.

For this reason, when hydraulic pressure is applied to the hold cylinder 90, the hold cylinder 90 extends, the cylinder body 91 moves downward, and the other end of the hold arm 82 is pushed downward by the cylinder body 91, and the hold arm 82 Swings downward with the pin 81 as a fulcrum. Then, the lower surface of the hold arm 82 pushes the eccentric wrist pin 45 downward and strongly presses the upper surface of the connecting rod connecting portion of the slide 40, so that the rotation of the eccentric wrist pin 45 can be fixed.

Conversely, when the hydraulic pressure is released to the hold cylinder 90, the hold cylinder 90 contracts and the cylinder body 9
The force by which 1 pushes the other end of the hold arm 82 downward is reduced. Then, the hold arm 82 is moved to the eccentric wrist pin 45.
Is reduced, and the eccentric wrist pin 45 becomes rotatable.

Therefore, according to the wrist pin hold unit 80, when the hold cylinder 90 is operated to release the tightening of the eccentric wrist pin 45 by the hold arm 82, the eccentric wrist pin 45 becomes rotatable. The eccentric wrist pin 45 can be rotated, and when the hold arm 82 is tightened by the hold cylinder 90, the eccentric wrist pin 45 does not rotate, so that the adjusted shut height does not go out during the pressing operation.

Next, the operation and effect of the slide adjusting device 50 of the forging press according to the present embodiment will be described. Forging press 1
When the eccentric shaft 20 is rotated by a motor or the like, the slide 40 is guided by the guide 12S of the column 12 by the pair of left and right connecting rods 30 and slides up and down, and a forged product is continuously formed.

As the forging operation is repeated, the billet temperature and the like change, the shut height becomes longer than at the start of forging, for example, and the thickness accuracy of the forged product deteriorates, so that the slide 40 stops at the top dead center. In the meantime, the slide height is adjusted by the slide adjusting device 50 as described below so as to shorten the shut height.

First, when the slide 40 stops at the top dead center, the hydraulic pressure of the hold cylinder 90 of the wrist pin hold unit 80 is released, and the hold cylinder 90 is contracted. Then, the force by which the hold arm 82 presses the eccentric wrist pin 45 downward decreases, and the eccentric wrist pin 45 becomes rotatable.

Next, when hydraulic pressure is applied to the adjusting hydraulic cylinder 63 and the adjusting hydraulic cylinder 63 is extended, the rack bar 62 moves forward, and the rack 62 r of the rack bar 62 moves the eccentric wrist pin 45 via the partial pinion 61. Rotate. Then, the distance between the slide 40 and the upper end of the connecting rod 30 increases, and the shut height decreases.

At this time, the rack bar 62 moves linearly, and since this linear motion is converted into the rotational motion of the eccentric wrist pin 45 by the rack 62r and the partial pinion 61, the operation of rotating the eccentric wrist pin 45 is performed. It can be done quickly and smoothly.

Further, the moving amount of the rack bar 62 is controlled by the rotary encoder 7 via the fastening plate 71 and the guide rod 72.
3, and the rotary encoder 73 detects the rotation amount of the rotating shaft. That is, the amount of adjustment of the shut height can be constantly grasped by the movement amount sensor 70. Therefore, the adjustment amount of the shut height can be set accurately.

When the change of the shut height is completed, hydraulic pressure is again applied to the hold cylinder 90 of the wrist pin hold unit 80, the hold cylinder 90 is extended, and the force of the hold arm 82 pressing the eccentric wrist pin 45 downward is large. Become. Then the eccentric wrist pin 45
The rotation is fixed between the upper surface of the connecting rod connecting portion of the slide 40 and the lower surface of the hold arm 82, and the adjustment of the shut height by the slide adjustment device 50 is completed.

As described above, according to the forging press slide adjusting device 50 of this embodiment, the rotation of the eccentric wrist pin 45 can be performed at a high speed, so that even if the forging press 1 is moved at a high speed, the slide 40 can be moved. While stopped at the top dead center, the adjustment of the shut height can be performed quickly and smoothly, and the thickness accuracy of the forged product can be kept constant.

[0036]

According to the slide adjusting device for a forging press of the first aspect, the adjusting hydraulic cylinder moves linearly.
The movement directly rotates the eccentric wrist pin through the engagement between the rack and the partial pinion, so that the eccentric wrist pin rotates quickly. Therefore, while the slide is stopped at the top dead center, the shut height can be adjusted quickly and smoothly, and the thickness accuracy of the forged product can be kept constant. According to this, the amount of movement of the rack and the amount of rotation of the eccentric wrist pin are proportional, and therefore, by detecting the amount of movement of the rack with the amount of movement sensor, it is possible to constantly grasp the slide height adjustment amount of the slide. According to the slide adjusting device of the forging press of claim 3, when the hold cylinder is operated and the hold arm is released, the eccentric wrist pin becomes rotatable, so that the eccentric wrist pin can be quickly rotated, When the hold arm is tightened by the hold cylinder, the eccentric wrist pin does not rotate, so that the adjusted shut height does not go wrong during the press operation.

[Brief description of the drawings]

FIG. 1 is a schematic sectional perspective view of a slide adjusting device of a forging press according to an embodiment.

FIG. 2 is a schematic sectional view of a forging press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forging press 30 Connecting rod 40 Slide 45 Eccentric wrist pin 50 Slide adjustment device 61 Partial pinion 62 Rack bar 62r Rack 63 Hydraulic cylinder for adjustment 70 Movement amount sensor 82 Hold arm 90 Hold cylinder

Claims (3)

[Claims] 1. A forging press in which a lower part of a connecting rod and an upper part of a slide are connected by an eccentric wrist pin, the forging press being attached to the lower part of the eccentric wrist pin and being concentric with the eccentric wrist pin; A slide adjusting device for a forging press, comprising: a rack bar provided with a meshing rack; and an adjusting hydraulic cylinder for reciprocating the rack bar in the axial direction. 2. A slide adjusting device for a forging press according to claim 1, further comprising a movement amount sensor for detecting a movement amount of said rack bar. 3. A holding arm for tightening and releasing the eccentric wrist pin with respect to an upper portion of the slide, and a hold cylinder for operating the holding arm in a tightening direction and a releasing direction. 2. A slide adjusting device for a forging press according to 1.