JPH09182931A - Upsetting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a time for adjustment by arranging a traveling mechanism, by which an inclination angle is changed in back/forth direction of a drive link and an oscillating quantity of a knocker arm is changed, so as to make wide range stroke adjustment possible. SOLUTION: When adjusting a knock-out quantity, an other end side pivot point of a second link 45 of a four articulated link mechanism A, which is arranged between an oscillating arm 35 and knocker arm 37, is traveled back/ forth direction by a traveling mechanism mechanism B, an inclination angle in back/forth direction of a drive link 41 around a drive link side pivot point of a first link 43 is changed. By this method, the second link 45 is traveled in relatively small quantity in back/forth direction by the traveling mechanism B, a wide range stroke adjustment is made possible from a smaller back/forth stroke of a knockout pin 22 to a larger back/forth stroke. Accordingly, an adjusting quantity of the second link 45 is made smaller, as a result, a time for adjustment can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forward stroke (knockout amount) of a knockout pin when a blank (material) in a die is pushed out by the knockout pin.
The present invention relates to a knockout adjusting device in a pressure forming machine having a mechanism for adjusting the knockout.

[0002]

2. Description of the Related Art A forging machine for producing bolts, nuts, and other parts usually uses a blanking machine supplied from the side of a machine base at a forging station having opposing dies and punches. In this case, the forging process is performed step by step precisely. In this case, the forging machine is provided with a knockout pin for discharging a blank driven into the die from the inside of the die after molding.

[0003] The knockout pin is inserted into a pin insertion hole provided in the machine base, and the tip of the knockout pin is exposed in a die.
And the rear end is in contact with a knocker arm having a knocker, swinging the knocker arm by the movement of a connecting rod or the like in conjunction with the retreating movement of the punch, and by pushing with a knockout pin with the knocker of the knocker arm, These knockout pins are moved forward to project the blank from the inside of the die to the outside.

[0004] For example, forming of bolts and the like is performed by a multi-stage forging machine having a multi-stage forging station comprising a plurality of punches and a plurality of dies arranged opposite to each punch. In such a bolt, there is a case where a small diameter portion is required to be extended to the tip of a shaft portion where a screw is engraved, and in that case, a blank processing length differs in each process. And the knockout amount of each knockout pin accordingly (ie, the amount of protrusion)
Need to be adjusted.

Conventionally, as means for adjusting the knockout amount of such a knockout pin, for example, Japanese Unexamined Patent Publication No.
No. 52137 discloses a technique as shown in FIG.

In this technique, the knockout pin P is mounted on the machine base A so that the tip of the knockout pin P is projected into the die (not shown), and swings around the support shaft C outside the machine base A. The swing lever D is connected to the cams F and G provided on the cam shaft E.
Are provided so as to be vertically swung by rollers H and I which respectively engage with the swinging lever D. The swing lever D is swung via a cam shaft E in conjunction with the movement of a punch (not shown). On the other hand, a knocker arm K that rotates about a support shaft J is provided separately from the swing lever D, and a drive link M having a roller L is connected to one end of the knocker arm K so as to swing freely. A connecting member R rotatably supported by an adjusting screw Q provided on the fixing member N is connected to an intermediate portion of the driving link M, and the connecting member R is moved in the front-rear direction by rotating the adjusting screw Q. To change the distance a from the center of the support shaft C of the swing lever D to the rolling contact position of the roller L of the drive link M, thereby causing the knocker arm to swing. The swing amount of K is changed.

According to this, the swing amount of the knocker arm K that follows the swing of the swing lever D via the drive link M is changed by changing the distance a, and the knocker arm K pushes the knockout pin P. Amount, and therefore the forward stroke of the knockout pin P (knockout amount)
Can be adjusted.

[0008]

In the technique shown in FIG. 6, the driving link M is moved from the support shaft C of the swing lever D.
By changing only the distance a to the rolling contact position of the roller L, the swing amount of the knocker arm K is changed. Therefore, when it is desired to adjust the knockout amount from a small knockout amount to a large knockout amount, the adjustment screw of the adjustment screw is required. The connecting member R must be largely moved in the front-rear direction together with the adjustment screw by performing a rotating operation for a long time. Therefore, it is necessary to set a large adjustment amount by the front-rear movement of the adjustment screw, and accordingly, the adjustment screw has to be adjusted accordingly. There was a problem that it took time to adjust by moving back and forth.

Accordingly, the present invention is capable of performing a wide stroke adjustment from a smaller forward movement stroke of the knockout pin to a larger forward movement stroke with a small amount of adjustment, and reducing the amount of adjustment of the adjusting member. It is another object of the present invention to provide a press forming machine including a knockout adjusting unit capable of shortening the time required for adjustment.

[0010]

That is, the present invention has a forging station in which a die 4 and a punch 6 are provided so as to face each other, and a knockout pin for projecting a blank out of the die behind the die 4. 22 and the punch 6
Forming with a rocking lever 35 that rocks in conjunction with the back-and-forth movement of the knocker, and a knocker arm 37 that rocks the knockout pin 22 by rocking in conjunction with the rocking of the rocking lever 35. In the machine, the swing lever 35 and the knocker arm 37 are provided with a lever portion 35a and an arm portion 37a, respectively, which extend rearward so as to face each other. The lever portion 35a and the arm portion 37a are respectively provided with facing surfaces. While the sliding contact surfaces 35b and 37b are formed, both sliding contact surfaces 3 are provided between the lever portion 35a and the arm portion 37a.
A drive link 41 whose both ends are in sliding contact with 5b and 37b, a fixed member 42 facing the drive link 41, and a pair of first and second links 43 and 45 connecting the drive link 41 and the fixed member 42. The four-link mechanism A is configured such that the one end of the first link 43 of the four-link mechanism A has a second portion at the intermediate portion in the longitudinal direction of the drive link 41.
One end of the link 45 is connected to the drive link side pivotal support of the first link 43 in the drive link 41 and the drive link 4
1 is pivotally supported at an intermediate portion between the one end portion and one end portion, and the other end side pivotal fulcrum of the second link 45 is moved to the fixing member 42 in the front-rear direction to drive the first link 43. By changing the tilt angle of the drive link 41 about the lateral pivot point in the front-rear direction, the knocker arm 3
It is characterized in that a moving mechanism B for changing the swing amount of 7 is provided.

According to the above configuration, when the knockout amount is adjusted, the other end of the second link 45 of the four-link mechanism A provided between the swing lever 35 and the knocker arm 37 by the moving mechanism B. Move the pivot point back and forth,
By changing the inclination angle of the drive link 41 about the drive link side pivot point of the first link 43 in the front-rear direction, the swing amount of the knocker arm 37 can be changed, and the knockout amount by the knockout pin 22 can be adjusted. It becomes possible.

In this case, since the drive link 41 is supported by the first link 43 at the intermediate portion in the longitudinal direction, when the drive link 41 swings, the arm 37 moves from the swing fulcrum of the knocker arm 37 to the arm 37. And the distance from the pivot point of the swing lever 35 to the sliding contact position with the other end of the driving link 41 is simultaneously changed. Become, and
The change increases the distance on the one side, while decreasing the distance on the other side. As a result, the second moving mechanism B
It is possible to perform a wide stroke adjustment from a smaller forward stroke of the knockout pin 37 to a larger forward stroke by merely moving the link 45 back and forth relatively small, that is, with a small adjustment amount of the second link 45. Becomes

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view of a multi-stage press forming machine according to the present invention. A die block 3 is disposed at a predetermined position on a machine base 2 of the press forming machine 1. 3 are provided with a plurality of dies 4... 4 from coarse to fine at regular intervals. In addition, the above die block 3
In front of the ram 5 mounted on the machine 2 in front of
The same number of punches 6 ... 6 as the dies 4 ... 4
Are formed so as to face each other, and a plurality of forging stations are formed, and a rear end of the ram 5 is integrated with a flywheel 8 which is rotated by a drive motor 7 of the forging machine 1. The ram 5 moves back and forth toward the die block 3 by being connected to the die block 3 via a connecting member 10.

A quill 11 and a cutter (not shown) for cutting the wire a into a predetermined size are provided on one side of the die block 3. A material supply means 12 for intermittently supplying a wire a to the quill 11 by a predetermined length at the rear position.
Are arranged. Further, on the die block 3, a material transfer chuck (not shown) for transferring a wire, a so-called blank, cut to a certain size by the quill 11 and a cutter (not shown) between a plurality of forging stations. ) Is provided, and a blank driven by punches 6 ... 6 is pushed out from the dies 4 ... 4 behind the dies 4 ... 4 as shown in FIG. Knockout pin means 14 is provided.

The drive mechanism of the material supply device 12, the chuck transfer means 13 and the knockout pin means 14 includes a pair of parallel link type rotary mechanisms 15 for rotating the crankshaft 9 for reciprocating the ram 5. , 15 to a camshaft 17 provided with a plurality of cam plates 16, 16a, 16b for protruding and driving the knockout pin means 14, while rotating the camshaft 17 via a chain transmission mechanism 18. The rotation is transmitted to the chuck opening / closing shaft 19 of the chuck transfer means 13 and the drive shaft 20 of the material supply means 12. Thereby, in synchronization with the advance / retreat operation of the ram 5, the material supply device 12, the chuck transfer means 13
And the knockout pin means 14 is driven.

Next, a description will be given of the knockout pin means 14 and the front / rear position adjusting means 21 for moving the means 14 back and forth to change the front / rear position of the tip portion in the die 4.

The knockout pin means 14 includes a knockout pin 22, a push rod 23 for moving the pin 22 back and forth, and an intermediate pin interposed between the knockout pin 22 and the push rod 23. 24. The front / rear position adjusting means 21 includes a motor 25 fixedly provided at an upper rear end of the machine base 2 and a motor 25.
A gear 28 driven through a transmission mechanism including a gear 26 fixed to the tip of the gear 26 and a gear 27 meshing with the gear 26, and a gear 29 meshing with the gear 28 are fixed to the shaft end. And a screw sleeve 30 screwed to the machine base 2 from the rear end of the machine base 2.

Then, the screw sleeve 30 is rotated in a predetermined direction by the motor 25 via the transmission mechanism, so that the depth of the hole formed by the tip of the knockout pin 22 and the die 4 becomes a desired blank shape. The front and rear positions of the knockout pin 22 are adjusted to be changed accordingly.

When the front / rear position of the knockout pin 22 is adjusted as described above, the knockout amount adjusting means 31 for adjusting the forward movement stroke of the knockout pin 22 is configured as follows. ing.

That is, a support shaft 32 is provided behind the cam shaft 17 in parallel with the cam shaft 17.
And a plurality of arm portions 3 on which rollers 33, 33a, 33b rollingly contacting the respective cam plates 16, 16a, 16b are axially supported.
One swing lever 35 integrally provided with the same number of lever portions 35a... 35a as the number of knockout pins 22 is rotatably supported.

Also, above the support shaft 32, the shaft 32
A support shaft 36 is provided in parallel with and a knocker arm 37 for hitting the pressing rod 23 is rotatably supported on the support shaft 36. At the upper end of this knocker arm 37,
A knocker 38 for hitting the pressing rod 23 is attached. The lever portion 37a of the knocker arm 37 and the lever portions 35a of the swing lever 35 both extend rearward and are provided so that the arm portion 37a and the lever portion 35a face each other. And lever part 3
Arc-shaped sliding contact surfaces 35b and 37b for receiving the ends of the drive links, which will be described later, are formed on the surface facing 5a, respectively.

The lever 35a and the arm 3
7a, a drive link 41 having rollers 39 and 40 slidably contacting both sliding contact surfaces 35b and 37b at both ends, a fixed frame 42 facing the drive link 41, and the drive links 41. A four-node link mechanism A including a pair of first and second links 43 and 45 connecting the fixed frame 42 is provided. First of the four-bar linkage A
One end of the link 43 is pivotally attached to the intermediate portion in the lengthwise direction of the drive link 41 by a pin 44, and the other end is pivotally attached to the fixed frame 42 by a pin 44a. One end is the drive link 41
The pin 46 is pivotally attached to an intermediate portion between the pin 44 and the roller 39. A screw shaft 47 is pivotally attached to the other end of the second link 45 by a pin 46a.
The screw shaft 47 is screwed into a tubular nut 49 which is rotatably supported by the fixed frame 42.

In this case, as shown in FIG. 2, the cylinder nut 49 is rotatably supported by a holding member 50 attached to the fixed frame 42 by fixing means such as bolts (not shown). A gear 51 is fixed to an end of the cylindrical nut 49, and a gear 53 provided on an output shaft 52 a of a pulse motor 52 mounted on an upper portion of the fixed frame 42 is interlocked with the gear 51. Are linked.

In this manner, the other end pin 46a of the second link 45 is moved in the front-rear direction by the screw shaft 47, the cylinder nut 49, and the pulse motor 52, and the drive link side pin 44 of the first link is moved. The moving mechanism B is configured to change the swing amount of the knocker arm 37 by changing the inclination angle of the drive link 41 in the front-rear direction around the center.

A base end of a rod 54 is pivotally supported at the end of the lever 35 a of the swing lever 35, and the end of the rod 54 is connected to the other end of the arm 37 a of the knocker arm 37. A spring member 56 inserted into the attached ball bearing 55 and fitted on the rod 54 is interposed between the tip of the rod 54 and the ball bearing 55, and the force of the spring member 56 The arm portion 37a of the knocker arm 37 is constantly urged toward the lever portion 35a side of the swing lever 35, and the drive link 41
Both rollers 39 and 40 are always in contact with the sliding surface 37 of the arm portion 37.
b and the sliding portion 35b of the lever portion 35a.

In addition, as shown in FIGS. 3 and 5, the sliding contact surface 37b of the knocker arm 37 and the sliding contact surface 35b of the swing lever 35 are arc surfaces having the same radius of curvature. Further, the slide contact surfaces 35b and 37b are formed so as to be located on a circle having the same radius around the pin 44 at the protrusion end position. Thereby, even if the drive link 41 is swung in the front-rear direction about the pin 44 to adjust the forward movement stroke amount of the knockout pin 22,
The protrusion end position is always located at the same position.

In the head forming machine equipped with such a knockout amount adjusting means 31, after the head is pressed by the ram 5 and the punch 6, the punch 6 is moved from the die 4 to the punch 6.
The cam shaft 17 is rotated in conjunction with the backward movement of the cam plate 16, and the cam plates 16, 16a and 16b rotate from the position shown in FIG. 2 to the position shown in FIG. 3, and the swing lever 35 swings upward. Accordingly, the knocker arm 37 also swings from the projecting start position shown in FIG. 2 to the projecting end position shown in FIG. 3 via the drive link 41 of the four-bar linkage A, so that the knocker 38 moves the pushing rod 23. Hit the middle pin 24,
The blank is projected from the inside of the die 4 through the knockout pin 22.

Further, as the punch 6 moves from the backward movement to the forward movement, the cam plates 16, 16a and 16b further rotate from the position shown in FIG. 3 to the position shown in FIG. 2, and the swing lever 35 swings downward. At the same time, the knocker arm 37 also swings counterclockwise by the force of the spring member 56, and the knocker 38 separates from the pushing rod 23 to the rear, so that the knockout pin 22 and the intermediate pin 2 are driven by blanking.
4. Prepare for the retraction of the push rod 23.

The knockout amount adjusting means 3
In 1, if the pulse motor 52 is rotated in the normal rotation direction or the reverse rotation direction, the cylinder nut 49 rotates, and the screw shaft 47 moves back and forth according to the rotation direction. Is transmitted to the link 41
Swings about the pin 44 so that the drive link 4
The inclination angle about the pin 44 is changed.

In this case, since the drive link 41 has its lengthwise intermediate portion supported by the pin 44, the screw shaft 47 is moved backward from the state shown in FIG. 5, for example, as shown in FIG. By selecting a state in which the drive link 41 is tilted so that the upper roller 39 is positioned rearward and the lower roller 40 is positioned forward with the pin 44 as the center, the sliding contact surface 37b from the axis of the support shaft 36 is selected. And roller 39
The distance Xa from the axis of the support shaft 32 to the rolling contact position between the sliding contact surface 35b and the roller 40 is changed to be shorter, while the distance Xa to the rolling contact position with the roller shaft 40 becomes longer. Will be. Thereby, the vertical movement amount of the drive link 41 with respect to the swing of the swing lever 35 is adjusted to be small, and the swing amount of the knocker arm 37 with respect to the vertical movement of the drive link 41 is also adjusted at the same time. . Therefore, by the synergistic effect of the two adjustments, the amount by which the knocker 38 pushes the knockout pin 22 (that is, the knockout amount La) is changed to be smaller, as is apparent from FIG. become.

On the other hand, when the screw shaft 47 is moved forward from the state shown in FIG. 3 as shown in FIG.
The upper roller 39 is tilted so that the upper roller 39 is positioned forward and the lower roller 40 is positioned rearward about the pin 44. Thereby, while the distance Xb from the axis of the support shaft 36 to the rolling contact position between the sliding contact surface 37b and the roller 39 is reduced,
The distance Yb from the axis of the support shaft 32 to the rolling contact position between the sliding contact surface 35b and the roller 40 is changed to be longer.

As a result, the vertical movement of the drive link 41 with respect to the swing of the swing lever 35 is adjusted to be large, and the swing of the knocker arm 37 with respect to the vertical movement of the drive link 41 is also simultaneously large. Will be adjusted. Therefore, due to the synergistic effect of both adjustments, the screw shaft 4
7, the amount by which the knocker 38 pushes the knockout pin 22 (that is, the knockout amount Lb) is changed to a greater extent as shown in FIG.

As described above, the screw shaft 4 is
It is possible to perform a wide range of stroke adjustments from a smaller forward movement stroke of the knockout pin to a larger forward movement stroke with only a relatively small amount of movement of the knockout pin 7 relative to the fixed frame 42. .
As described above, the amount of adjustment of the second link 45, in other words, the screw shaft 47 can be reduced, so that the time required for adjustment can be reduced.

In the above embodiment, the multi-stage press forming machine 1 is taken as an example. However, it goes without saying that the present invention can be applied to a single-stage press forming machine. In other words, in the case of manufacturing bolts having different shaft lengths little by little, it is necessary to adjust the knockout amount of the knockout pin each time to match the processing length of the forged product. The present invention can effectively cope with such a case.

In the above embodiment, the cylinder nut 49 is rotated by the pulse motor 52 to move the second link 45 back and forth by the reciprocation of the screw shaft 47. For example, the screw shaft 47 and the cylinder Instead of the moving mechanism using the nut 49 and the pulse motor 52, the moving mechanism may be configured to be moved back and forth by, for example, a fluid pressure cylinder.

Further, the second link 45 is connected to the drive link 4
1 and the lower roller 40 of the drive link 41 and the pin 4
Needless to say, it may be arranged at an intermediate portion between the first and fourth members.

The spring force urging means for constantly urging the knocker arm 37 toward the swing lever 35 is provided between the knocker arm 37 and the swing lever 35 as described above. A spring force urging means may be provided between 37 and the machine base 2, and the knocker arm 37 may be constantly urged toward the swing lever 35 by the spring force urging means.

[0039]

As described above, according to the present invention, when adjusting the knockout amount, the second mechanism of the four-joint link mechanism A provided between the swing lever 35 and the knocker arm 37 by the moving mechanism B is used. By moving the pivot point at the other end of the link 45 in the front-rear direction and changing the inclination angle of the drive link 41 in the front-rear direction about the drive link-side pivot point of the first link 43, the swing of the knocker arm 37 is changed. The distance from the pivot point to the sliding contact position of the arm 37 with one end of the drive link 41 and the distance from the pivot point of the swing lever 35 to the sliding contact position of the lever 35 with the other end of the drive link 41 are set. at the same time,
In addition, while the distance on one side is longer, the distance on the other side can be changed to be shorter, so that the movement mechanism B can move the second link 45 relatively back and forth only by a relatively small amount. That is, it is possible to perform a wide range of stroke adjustment from a smaller forward movement stroke of the knockout pin 22 to a larger forward movement stroke with a small adjustment amount, and accordingly, the adjustment amount of the second link 45 can be reduced. Thus, the time required for the adjustment can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a multi-stage press forming machine according to the present invention.

FIG. 2 is an enlarged view of a part of a knockout amount adjusting means of the forging machine.

FIG. 3 is an enlarged view of a part of a knockout amount adjusting means showing the protruding state.

FIG. 4 is an enlarged view of a portion of a knockout amount adjusting means showing a state in which the knockout amount is changed to be large.

FIG. 5 is an enlarged view of a portion of a knockout amount adjusting means showing the protruding state.

FIG. 6 is an explanatory diagram of a conventional knockout amount adjusting mechanism.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pressure forming machine 2 machine stand 3 die 6 punch 14 knockout pin means 16, 16a, 16b cam plate 17 camshaft 22 knockout pin 31 knockout amount adjusting means 35 rocking lever 35a lever portion 35b sliding contact surface 37 knocker arm 37a arm Part 37b Sliding contact surface 41 Drive link 42 Fixed frame 43 First link 44, 44a Pin 45 Second link 46, 46a Pin 47 Screw shaft 49 Cylinder nut 52 Pulse motor 24 Knockout pin A Four-node link mechanism B Moving means

Claims (1)

[Claims] 1. A die forming station having a die 4 and a punch 6 facing each other, a knockout pin 22 for ejecting a blank to the outside of the die 4, and a back and forth movement of the punch 6. And a knocker arm 37 that pushes the knockout pin 22 by swinging in conjunction with swing of the swing lever 35. hand,
The swing lever 35 and the knocker arm 37 are provided with a lever portion 35a and an arm portion 37a extending rearward, respectively, so as to face each other.
a, sliding surfaces 35b and 37b are formed on the opposite surfaces of the lever portion 35a and the arm portion 37a, respectively.
Between the two sliding contact surfaces 35b and 37b, a drive link 41 whose both ends are in sliding contact with each other, a fixing member 42 opposed to the drive link 41, and a pair of connecting the driving link 41 and the fixing member 42. A four-node link mechanism A including the first and second links 43 and 45 is provided.
Of the first link 43, one end of the first link 43 is located at an intermediate portion in the longitudinal direction of the drive link 41, and the second link 45 has one end thereof at the drive link side pivotal support portion of the first link 43 in the drive link 41 and the drive link. 41 is pivotally supported at an intermediate portion between one end and 41, and the other end side pivotal support point of the second link 45 is moved in the front-rear direction with respect to the fixing member 42 to drive the first link 43. The forging machine is provided with a moving mechanism B for changing the swing amount of the knocker arm 37 by changing the tilt angle of the drive link 41 about the lateral pivot point in the front-rear direction.