JPH0753797Y2 - Extrusion stripper drive for forging machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion stripper driving device in a forging molding machine in which a punch side is provided with an extrusion stripper for extruding a blank formed on the punch.

[0002]

2. Description of the Related Art A press forming machine for forming bolts, nuts, and various other parts roughly cuts a blank (material) supplied from the side of a machine base at a press forming station equipped with a die and a punch which face each other. This is to continuously produce a product of a predetermined shape by precisely forging from a die.This type of forging machine is equipped with multiple forging stations and punches from the die after processing at each forging station. The process of separating the blanks from the die, pushing out the blanks punched in the die by the knockout pins, chucking the blanks by the chucks for transferring the blanks, and transferring them to the next forging station is repeated.

By the way, in the above-mentioned press forming, a blank is generally punched into a die by a punch. However, depending on the shape of the product, a recess B for press forming is also provided on the punch A side as shown in FIG. When the blank X is driven into the die C, forging may be applied to one end of the blank even on the punch side. In that case, at each forging station, the material X is produced by the above forging process.
Since one end of the blank X rushes into the punch A and is bitten into the punch A, the blank X is pushed out from the die C by the knockout pin D prior to the blank transfer after the forging.
It is necessary to push it out from the punch A as well.

Therefore, for example, Japanese Patent Publication No. 60-2180
In the publication No. 7, an extrusion stripper corresponding to the knockout pin (corresponding to the extrusion stripper E in FIG. 6) is provided on the punch side, and when the punch retracts, the drive lever is operated by the cam plate to move the extrusion stripper, A technique is disclosed in which a blank is extruded from the recess toward the die side.

[0005]

By the way, in the forging machine equipped with the forging recess and the extrusion stripper on the punch side, punches having different depths are used depending on the molded product to be manufactured. However, since the pushing stroke in the pushing pin drive device is constant depending on the shape of the cam plate, the pushing amount may be insufficient or the pushing amount may be excessive depending on the blank as it is. In that case, it is conceivable to replace the cam plate so that a prescribed amount of extrusion can be obtained, but this requires a great deal of labor, so conventionally, an extrusion stripper was constructed by combining pins with multiple lengths. However, an appropriate amount of extrusion was obtained by changing the number of combinations. However, the work of pulling out and inserting the extrusion stripper, which is passed through the small holes in the punch box, is complicated and lacks workability.

Therefore, an object of the present invention is to provide an extruding pin driving device for a forging machine in which the extruding stroke of the extruding stripper on the punch side can be easily adjusted from the outside.

[0007]

That is, the extrusion stripper driving device of the forging machine of the present invention is held by the punch which is moved forward and backward in opposition to the die and is interlocked with the backward movement of the punch. A press forming machine provided with an extrusion stripper for pushing out a blank after forging to a die side, wherein a cam plate which is reciprocally rotated in conjunction with the advance and retreat movement of the punch, and a cam action of the cam plate at one end A drive lever which is disposed in contact with the surface and drives the extrusion stripper in the extrusion direction by the rotation of the cam plate, and is attached to the cam plate and extends from the cam plate along the cam action surface and the cam. An auxiliary cam plate capable of protruding in a direction of increasing the length of a portion of the action surface for rotating the drive lever, and a protrusion amount adjustment for adjusting the protrusion amount of the auxiliary cam plate Characterized by providing a stage.

[0008]

According to the above construction, by storing the auxiliary cam plate inside the cam plate, the length of the portion of the cam working surface of the cam plate for rotating the drive lever is minimized and it acts on the drive lever. The pressing amount is reduced, and the moving stroke of the extrusion stripper driven by the drive lever is shortened. On the other hand, if the auxiliary cam plate is used in a state of protruding from the cam plate, the cam acting surface of the cam plate becomes longer according to the amount of protrusion, the amount of rotation of the drive lever increases, and the pushing stripper's The moving stroke also becomes longer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a multi-stage press forming machine 1, in which a die block 2 is provided at a predetermined position of a machine base of the molding machine 1, and a plurality of (5 in the drawing) dies 3 are provided in the die block 2. ~ 3 are arranged at regular intervals, and the same number of punches 5 as the above-mentioned dies 3 are provided on the front surface of the ram 4 (shown in Fig. 2) moving toward and away from these dies 3-3. The die 3 and the punch 5 are arranged so as to face each other to form a plurality of forging stations, and a blank (not shown) is roughly cut between the punch 5 and the die 3 by the forward and backward movement of the punch 5. Since then, it is designed to be pressed in stages in a step-by-step manner.

A support frame 6 is slidably mounted on the die block 2 described above. A drive rod 7 that moves forward and backward with a predetermined stroke in a die arrangement direction orthogonal to the punch 5 is connected to one end of the support frame 6 in synchronization with the forward and backward movements of the ram 4 and the punch 5 by a connecting pin 8. As the drive rod 7 moves back and forth, the support frame 6 is reciprocated by a distance equal to the interval between the adjacent dies 3 and 3 within the time when the punch 4 is retracted.

Further, the front surface of the support frame 6 has the same number of blank transfer chucks 9 to 9 as the dies 3 to 3.
Is provided. Then, as the support frame 6 is reciprocally moved by the drive rod 7, the chucks 9 to 9 chuck the blanks and transfer the blanks between the dies. That is,
The blanks are transferred while the punch 5 is retracting.

On the other hand, on the side of the punch 5 arranged so as to face the dies 3 to 3, a drive shaft (not shown) is provided as shown in FIG.
Connecting rod 1 to crankshaft 10 which is eccentrically rotated by
The crank pin 12 is attached via 1 and the crank pin 12 is connected to the ram 4, so that the ram 4 moves with the rotation of the crank shaft 10 and the ram 4
The punch 5 attached to the tip of the die is configured to move back and forth with respect to the die 3.

In this case, the punch block 13 is fixed to the front surface of the ram 4, and the punch holder 15 is attached to the punch block 13 through the spacer 14.
The punch 5 is fitted in the punch holder 15, and the punch 5 is fixed by a bolt 16 which is passed through the punch holder 15. Also, punch block 13 and ram 4
A taper groove 17 is formed between the punch block 13 and the ram 4, and a taper member 19 is provided in the taper groove 17 so as to be in contact with a taper surface 18 on the ram 4 side and movable up and down. The base member 20 is fixed over the upper surface portion. The screw shaft 21 is formed on the upper surface of the taper member 19.
Is mounted in a state where the rotation is stopped by a lock nut 22, and the upper end of the screw shaft 21 penetrates the base member 20 and is taken out upward, and the nut-like body 23 is taken out at the taken-out portion.
Are screwed together. Therefore, when the taper member 19 is moved up and down by rotating the nut-like body 23 by an appropriate means, the pressing member 24 interposed between the taper member 19 and the back surface of the punch 5 is used. The punch mounting position can be adjusted by moving the punch 5 in its axial direction.

Further, the die 3 described above is provided with a well-known knockout pin (not shown), and the punch 5 is provided with a recess 25 for forging forming on the front surface facing the die 3 and is also forged. An extrusion stripper 26 is provided for extruding the material from the recess 25 toward the die 3 side after processing. Therefore, pin holes are integrally formed through the punch 5, the pressing member 24, the taper member 19 and the ram front face portion 4a, and the extrusion stripper 26 is slidably passed through these pin holes. Also,
The extrusion stripper 26 has a base on the ram 4 side,
It is projected into a space 27 formed inside the ram front surface portion 4a. Correspondingly, in the upper part of the void 27,
A support shaft 29 orthogonal to the forward / backward movement direction of the punch 5 or the ram 4 is arranged over a pair of brackets 28 (only one of which is shown in the drawing) erected on the upper surface of the ram 4. The support shaft 29 has a substantially L-shape. The drive lever 30 is attached, and one end of the drive lever 30 is hung in the space 27 so that the cushion member 3 is attached to the base of the extrusion stripper 26.
It is applied through 1. Although the above-mentioned extrusion stripper is divided into a plurality of pins, the detailed structure thereof is omitted here, and one extrusion stripper 2 is provided.
6 will be described.

Furthermore, a bracket 32 (only one of which is shown in the drawing) is provided upright on the upper surface of the ram 4 above the support shaft 29 and at a position close to the crankpin 12.
Between the cam shaft 33 (see FIGS. 2 to 4) in parallel with the support shaft 29.
(Refer to FIG. 3), and a cam mount 34 is attached to the cam shaft 33.
Can be installed. A bracket 35 is provided on the cam mount 34, and a connecting pin 36 is attached to the bracket 35.
The connection link 37 is pivotally attached via the
The other end of is also pivotally attached to the above-mentioned connecting rod 11 at a portion close to the crankshaft 10 via the connecting pin 38. Therefore, of the kinematic force due to the eccentric rotation of the crankshaft 10, the force of the vertical movement component is extracted as the rotational force around the cam shaft 33 to the cam mount 34 via the connecting link 37.

Further, each of the above-mentioned cam mounts 34 is provided with a protruding cam mount 39 (see FIG. 3) on the peripheral surface thereof, and a cam plate 40 corresponding to the cam mounts 34.
Can be installed. The mounting structure in that case is not particularly limited, but in the case of the illustrated embodiment structure, FIG.
As shown in FIG. 4, the mounting portion 39 is fitted into the dovetail-shaped groove 41 provided on the cam plate 40, and is screwed from the side opposite to the groove 41 through the flange 40a provided on the cam plate 40. By pressing the bolt 42 against the mounting portion 39, the mounting portion 39 and the groove 41 are fixed by the engaging force by the engaging portion m (shown by an arrow) and the pressing force by the bolt 42. The cam follower 43 pivotally supported at the other end of the drive arm 30 is in contact with the cam acting surface of the cam plate 40.

Further, the cam plate 40 is formed with a cam action surface in such a shape that the cam follower 43 is pushed down by the rotation interlocked with the backward movement of the punch 5. That is, the cam acting surface shape of the cam plate 40 is continuous with the curved surface portion a1 in the direction away from the cam shaft 33 and is flat in the direction away from the cam shaft 33.
1 and the end of the flat portion b1 is the cam shaft 3
It is an arc part c1 centered on 3, and when the punch 5 retracts,
The cam plate 40 is rotated in the direction of arrow x in FIG. 3 by the rotational force applied to the cam mount 34 by the connecting link 37, and the cam follower 43 is pushed down from the curved surface portion a1 to the flat portion b1. ing.

Further, an auxiliary cam plate 44 is built in the cam plate 40, and can be projected from the above-mentioned arc portion c1 of the cam plate 40 by a drive mechanism 45 described later. In this case, the auxiliary cam plate 44 is inserted into the space 46 of the cam plate 40 (see FIG. 4) and is supported by the guide rod 47 provided on the side of the cam plate 40 so that it can be guided by the guide rod 47. It is attached to slide. In addition, a flat portion b which is continuous with the flat portion b1 of the cam acting surface of the cam plate 40 in the protruding state on the auxiliary cam plate 44.
2 and an arc portion c2 that is continuous with this are formed.

The drive mechanism 45 for causing the auxiliary cam plate 44 to project from the cam plate 40 and to store the auxiliary cam plate 44 is only rotated in parallel with the guide rod 47 above the cam plate 40 in the cam mount 34. A freely arranged screw shaft 48 (see FIG. 4), a moving base 49 screwed to a threaded portion of the screw shaft 48, and a cam plate 40 protruding from the moving base 49 and provided on the cam plate 40. The connecting rod 51 engaged with the auxiliary cam plate 44 through the opening 50 and the screw shaft 48.
Bevel gear 52 provided at one end of the bevel gear 5 and the bevel gear 5
In addition to having a bevel gear 53 that is screwed to 2, the rotary shaft 54 is rotatably supported by passing through the above-mentioned cam mount 34.

Corresponding to such a drive mechanism 45, FIG.
As shown in FIG. 3, a mount 56 is provided on the side of the cam mount 34, and a forward / reverse motor 57 and a cylinder 58 for moving the output shaft of the motor 57 forward and backward are provided on the mount 56. This motor 57 has a bevel gear 59 on its output shaft, and when it is advanced by the cylinder 58, the bevel gear 60 formed on the projecting end of the rotary shaft 54 described above.
The rotation shaft 54 is rotated as the motor 57 is rotated from this meshed state, and the screw shaft 48 is rotated by the meshing of the bevel gears 52 and 53. 48, and the auxiliary cam plate 44 moves the motor 5
The cam plate 40 is projected or stored in accordance with the rotation direction of 7. As is clear from this, the amount of protrusion of the auxiliary cam plate 44 from the cam plate 40 is determined by the rotation amount of the motor 57. Further, since the motor 58 selects the projecting amount or the housed state of the auxiliary cam plate 44 as described above, it is retracted by the cylinder 57 after the selection so that the bevel gears 59 and 60 are disengaged from each other and the spindle 33 is rotated. Do not prevent the rotation of the cam plate 40 around it.

Although the adjusting structure using the cam plate 40 is provided for each punch, the protrusion amount of the auxiliary cam plate 44 is adjusted by the motor 57 individually.

Further, in the drive lever 30 described above,
A rod 61 (see FIG. 2) is attached to the upper surface of the ram 4 in order to constantly urge the cam follower 43 in the direction of contacting the cam plate 40.
Is erected, the arm 62 on the drive lever 30 side is fitted onto the rod 61, and the receiving member 63 at the tip of the rod is installed.
A coil spring 64 is provided between the arm 62 and the arm 62 so that the movement of the drive lever 30 is absorbed by the coil spring 64 and, at the same time, the above-mentioned urging is performed.

Next, the operation will be described.

As described above, in the press forming with the die 3 and the punch 5, the punch 5 is brought close to the die 3 by the ram 4, the blank is driven into the die 3 by the punch 4, and then the punch 5 is retracted, While the pressing by the next approach is performed, the support frame 6 is reciprocally moved by the drive rod 7, and the blanks punched by the knockout pins from the dies 3 to 3 are transferred to the blank transfer chucks 9 to.
It will be transferred between the forging stations by 9.

Further, in the case where the punch 5 provided with the recess 25 as shown in FIG. 2 is used and the blank is processed also on the punch 5 side, it is interlocked with the separation of the punch 5 from the die 3, A blank is ejected from the die 3 by a knockout pin, and at the time when the blank comes out of the die 3, the extrusion stripper 26 on the punch 5 side pushes the blank from the recess 25 of the punch 5 and chucks the blank transfer chuck 9. Is required.

In this case, in this embodiment, the auxiliary cam plate 44 is completely housed in the empty space 46 of the cam plate 40 prior to the operation of the forging machine 1 and is moved by the cam plate 40 when the punch is retracted. If the cam follower 43 is pushed down, the cam follower 43 is pushed down as the cam plate 40 rotates in the direction of the arrow x while sliding relatively from the curved surface portion a1 of the cam acting surface to the flat portion b1, and then the arc portion c1. Therefore, the push-down will be stopped. Therefore, the descending amount of the cam follower 43 in that case is as small as L1, the rotation of the drive lever 30 corresponding to this descending amount can be obtained, and the pushing stripper 26 driven by the driving lever 30 in the material pushing direction. The extrusion stroke of is also the shortest.

On the other hand, if the auxiliary cam plate 44 is projected from the cam plate 40, the flat portion of the cam acting surface of the cam plate 40 will have the amount of protrusion of b2 added to b1. The descending amount of the cam follower 43 increases from L1, and the pushing stroke of the pushing stripper 26 becomes longer.
Also, the lengthening amount can be changed by adjusting the protrusion amount of the auxiliary cam plate 44.

Therefore, when it is necessary to change the extrusion stroke of the extrusion slipper 26 on the side of the punch 5 in order to replace and use the punch 5 in which the depth of the concave portion 25 differs depending on the product to be press-formed, the above-mentioned operation is performed. By moving the auxiliary cam plate 44 by the motor 57, it is possible to selectively shorten or lengthen the pushing stroke according to the punch 5 to be used. And, in that case, the extrusion stroke can be adjusted without replacing the cam plate or changing the length of the extrusion stripper 26, so that the extrusion stroke can be easily adjusted and the adjustment can be performed steplessly. Can be applied to.

Further, in the above-mentioned embodiment, the recess 5 is formed in the punch 5.
Although 5 is formed and forged, a pin is projected from the punch side, and a punch with this pin and a die
The present invention can also be applied to the case of forming a cup-shaped hollow blank in the die. In that case also, since the blank adheres to the punch and retreats after the forging process, a mechanism in which the extrusion stripper is projected from the punch and the blank is pushed to the die side is adopted.

In the above embodiment, the connecting link 37
The driving force of the crankshaft 10 by the cam mount 34
Although the rotational force of the cam plate 40 is transmitted to the cam shaft 40, the drive shaft for driving the crank shaft 10 and the cam shaft 33 may be linked by a gear device to directly drive the cam shaft 33. It is possible.

[0031]

As is apparent from the above description, according to the present invention, when the auxiliary cam plate is housed inside the cam plate, the cam working surface of the cam plate becomes extremely small, and the pressing amount acting on the drive lever is reduced. And the travel stroke of the extrusion stripper driven by the drive lever is shortened. On the other hand, if the auxiliary cam plate is used in a state of protruding from the cam plate, the cam working surface of the cam plate becomes steplessly long according to the amount of projection, and the amount of rotation of the drive lever increases and the pushing out The movement stroke of the stripper is also lengthened. Therefore, unlike the conventional push stroke switching method, there is no need to replace the cam plate or adjust the length of the push pin, and switching can be performed with good workability.

[Brief description of drawings]

FIG. 1 is a front view of a die-molding side of a press molding machine according to the present invention.

FIG. 2 is a sectional view of a punch and a ram side facing the die block.

FIG. 3 is an enlarged view of a cam plate portion in FIG.

FIG. 4 is a schematic configuration diagram of the cam plate.

5 is a view taken along the line AA of FIG.

FIG. 6 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Press forming machine 3 Die 4 Ram 5 Punch 25 Recessed portion 26 Extrusion stripper 30 Drive lever 40 Cam plate 44 Auxiliary cam plate 48 Spiral shaft 49 Moving table 51 Connecting rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-77867 (JP, A) Actual opening Sho-53-12842 (JP, U) Actual opening Sho-58-128735 (JP, U) JP-B Sho-60- 21807 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A press forging in which a punch which is moved forward and backward facing a die is provided with an extruding stripper for interlocking with the backward movement of the punch and for pushing the blank after pressing, which is held by the punch, toward the die side. A molding machine, which is a cam plate that is reciprocally rotated in conjunction with the advance and retreat movement of the punch,
A drive lever, one end of which is disposed in contact with the cam action surface of the cam plate, drives the extrusion stripper in the extrusion direction by the rotation of the cam plate, and is attached to the cam plate, and the cam action is performed by the cam plate. Of the auxiliary cam plate that is capable of protruding along the surface and in a direction that increases the length of the portion of the cam action surface that rotates the drive lever, and the projection amount that adjusts the projection amount of the auxiliary cam plate An extrusion stripper driving device for a forging machine, which is provided with an adjusting means.