JPH0342976B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a homer that shears a hollow wire rod into a hollow material of a certain length and presses the material between a heading die and a punch to form a desired shape.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION In this type of homer, shearing dies are lined up and fixed on the side of a heading die fixed to a frame, and a hollow wire protruding from the shearing die is inserted in front of the shearing die. The cutter, which slides along the cutter, is penetrated and abuts against the stopper, and the fixed core attached to the support rod protruding from the center of the stopper is inserted into the cutter, and the fixed core is fixed by the frictional force caused by feeding the hollow wire. Floating core metals that are pressed against the gold are placed in shearing dies, and the hollow wire is sheared at the contact surfaces of both core metals by the sliding of the cutter without deforming the cut end, and the sheared hollow material is At the material protruding position, the material is pushed out from the cutter to the punch side by a pusher pin, held by fingers and moved in parallel to the front of the heading die, and pressed between the heading die and punch to form the hollow material. The push-out pin works in conjunction with the push-shear pin and projects in the same direction, but in the past, the shearing die faced the same direction as the heading die and the stopper faced the push-out pin. During ejection, the hollow material ejected from the cutter and held by the fingers is transferred so as not to get caught.
The stopper must be moved back a large distance until the fixed core bar is completely extracted from the hollow material, and a device is required to move the stopper back in time with the pusher pin, which not only complicates the structure. Since the amount of movement of the stopper is greater than the amount of protrusion of the pusher pin, the time required for its movement is long, which has been an obstacle to increasing speed.

Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention provides an annular shape that is fixed at a shearing position on the side of the heading die of the frame and whose shearing surface is oriented in the same direction as the punch. a shearing die; a driver that reciprocates between the shearing position and a material protrusion position provided closer to the heading die than the shearing position; a ring-shaped cutter that comes into contact with the shearing die at a certain time; a stopper that is attached to the drive body so that its position can be adjusted and has a protrusion formed on its outer periphery; a protruding tube that is slidably fitted and always retracted from the abutment surface of the stopper due to spring elasticity; A fixed core metal that is tightly fitted into the hollow wire, a floating core metal that is tightly fit into the hollow wire rod and is pressed against the fixed core metal due to the frictional force accompanying feeding of the hollow wire rod, and the protrusion tube is pushed and sheared at the material projection position. The present invention is configured to include a pusher pin that protrudes the hollow material that has been cut out from the cutter, and a transfer device that transfers the pushed out hollow material to the front surface of the heading die.

Effects and Effects of the Invention The present invention has the above configuration, and as the pusher pin is pushed out at the material projecting position, the end face and part of the stopper are pushed out toward the cutter side along the support rod. Therefore, the sheared hollow material passes between the inner periphery of the cutter and the outer periphery of the fixed mandrel and is ejected to the front of the cutter, and the protrusion of the hollow material is moved in the direction in which the stopper is ejected. This eliminates the need for a complicated mechanism to move the stopper in time with the ejection of the pusher pin, and the ejection is performed while the pusher pin makes one reciprocation, reducing the time required for one ejection. This has the effect of making it possible to drive at high speed.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

As shown in the figure, a forging die block 5 has a first forging die 51 and a second forging die 52 fitted on the front surface of the frame 2 and spaced apart from each other.
0 is fixedly installed, and in front of it, a first
Ram 5 fitted with punch 54 and second punch 55
The first forging die 51 and the hollow material b are sheared to a certain length by the shearing device A installed on the side of the forging die block 50. Preforming is performed by applying pressure between the first punch 54 and finishing molding is performed between the second heading die 52 and the second punch 55.

The shearing device A described above has a
A shearing die block 1, which has a supply hole 3 through which a long hollow wire a is fed from the back side, connects a shearing surface 7 from which the hollow wire a is ejected to a ram 53.
The shearing die 4 housed in the holder 5 is fixed to the shearing surface 7 by a set screw 6. In the recess in front of the shearing die block 1, the drive body 10 is moved between a shearing position It is designed to reciprocate while slidingly contacting the shearing surface 7.

The drive body 10 has a swing plate 11 and a drive plate 12.
The support body 15 is fixed to a cylindrical body 14 externally fitted on the support shaft 13 at intervals in the front-rear direction, and the support body 15 is attached to a guide bar 17 by rotation of a threaded rod 16 between the swing plate 11 and the drive plate 12. The drive plate 12 is attached so that its position can be adjusted in the longitudinal direction along the
A swinging drive device (not shown) is connected to the lower end of the swinging plate 11, and a cutter 20 that slides on the front surface of the shearing die 4 and whose axis coincides with the shearing die 4 at the shearing position X is attached to the swinging plate 11. It is housed in a holder 21 and fixed with a set screw 22. A stopper 25 having three axial protrusions 26 formed on its outer periphery is housed in a holder 27 in a mounting hole 24 formed concentrically with the cutter 20 in the support 15 and fixed by a set screw 28. , the tip of the hollow wire a protruding through the cutter 20 is the stopper 2.
The support rod 31 that protrudes toward the cutter 20 side is tightly fitted into the center hole 62 formed in the stopper 25 so as to abut against the collar 29 at the tip of the protrusion 26 of the stopper 25. By screwing the male threaded portion 63 into the rear end of the center hole 62 and passing it through, and tightening the lock nut 65 at the penetrating end, the support rod 31 is secured to the stopper 25.
A fixed core bar 30 having a diameter slightly smaller than the inner diameter of the hollow wire a is fixed to the male screw part 66 at the tip of the support rod 31 so as to be adjustable in the front and back direction and with the axis aligned. is fixed by screwing so that its axis is aligned with the stopper 25 and its tip surface is in sliding contact with the front surface of the shearing die 4. On the other hand, in the shearing die block 1, a hole is inserted into the supply hole 3. , a floating core metal 32 is fitted to the outer periphery of the hollow wire rod a, and an O-ring 33 is fitted to the inner periphery of the hollow wire rod a, and a floating core metal 32 is fitted therein.
When the hollow wire a is fed out, it is pressed against the end surface of the fixed core metal 30 by the frictional force between the inner circumferential surface and the O-ring 33.

In the drive plate 12 of the drive body 10, a protrusion pipe 38 for protruding the sheared hollow material b from the stopper 25 side to the cutter 20 side is slidably provided in a mounting hole 35 formed concentrically with the stopper 25. is fitted, and its tip passes through between the outer periphery of the stopper 25 and the inner periphery of its holder 27 with the three long grooves 39 formed in the axial direction fitted into the three protrusions 26 of the stopper 25. It is attached so that it can protrude toward the cutter 20 side, and is protruded by the elasticity of a compression coil spring 43 fitted between the cover 40 attached to the rear end of the protrusion tube 38 and the rear end surface of the stopper 25. The tube 38 is urged in the backward direction, and the protruding tube 3 is always
The rearward movement of the lid body 40 of No. 8 is regulated by being locked to a bent locking portion 45 at the rear end of an elongated locking plate 44 fixed to the sides of the drive plate 12 and the support body 15. , the end surface of the protruding tube 38 is the stopper 25
It is designed to be held in a position slightly retracted from the tip surface of the

At the material protruding position Y, the kick-out pins 56, 56 that protrude the formed hollow material b of the forging die block 50 are interlocked with, and are the same as, the rear position of the ejecting tube 38 of the driving body 10. A pusher pin 46 that moves forward and backward in the direction is attached by being fitted into a support block 47, and this pusher pin 46 is attached to the locking plate 4.
The protruding pipe 3 passes through the through hole 45a of the locking part 45 of No.
By pushing the lid 40 at the rear end of 8, the protruding tube 38 moves along and around the support rod 31 from the stopper 25 side toward the cutter 20 side against the elasticity of the compression coil spring 43. It is designed to be ejected at high speed to cover the area. Further, a driving body 10 is located in front of the forging die block 50.
The fingers 48 hold the sheared hollow material b ejected from the cutter 20 by pinching it and transfer it to the front position of the first heading die 51, and the hollow material b ejected after preforming is transferred to the second heading die. A finger 58, which is transferred to a position in front of the die 52, is attached so as to be reciprocated in conjunction with each other.

The present embodiment has the above-mentioned configuration, in which the driving body 10 of the shearing device A is the shearing device
The floating core bar 32 passes between the fixed core bar 30 and hits the stopper 25, and the floating core bar 32 touches the fixed core bar 30.
When the driving body 10 swings at a high speed by a drive device (not shown) in the state where it hits, the tip surface of the fixed core bar 30 slides on the tip surface of the floating core bar 32, and at the same time the cutter 20 slides on the tip surface of the shearing die 4. By sliding on the front surface at high speed, the hollow wire a is sheared into a hollow material b of a certain length, and after shearing, the driving body 1
0 moves to the material protrusion position Y, the stopper 25
By driving the pusher pin 46, the protruding tube 38 is pushed out at high speed to a position near the back of the cutter 20 without the fixed core bar 30 moving, and the sheared hollow material b is pushed into the inner part of the cutter 20. The cutter 2 passes through between the circumference and the outer circumference of the fixed core bar 30.
0, and after the ejection, the ejection tube 3
8 retreats to its original position by the elastic expansion force of the compression coil spring 43, and this protrusion process is carried out during the extremely short time required for the protrusion tube 38 to reciprocate at high speed. The drive body 1
0 returns to the shearing position X, the hollow wire a is sheared, and the above operations are repeated, whereby the hollow material b is formed into a desired shape through each process.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway plan view, FIG. 2 is a cross-sectional view of the shearing device in a shearing position, and FIG. 3 is a partially cutaway perspective view of the drive body. 2: Frame, 4: Shearing die, 7: Shearing surface,
10: Drive body, 20: Katsuta, 25: Stopper,
30: Fixed core bar, 31: Support rod, 32: Floating core bar, 48: Finger, 51: First heading die, 5
2: Second heading die, 53: Ram, 54: First punch, 55: Second punch, A: Shearing device, X: Shearing position, Y: Material protrusion position, a: Hollow wire rod, b:
Hollow material.

Claims (1)

[Scope of Claims] 1. A homer in which a punch is attached to the tip of a ram that reciprocates against a forging die fixed to the frame to press and shape a hollow material between the forging die and the frame. an annular shearing die fixedly installed at a shearing position on the side of the forging die and having a shearing surface oriented in the same direction as the punch; and a material protrusion position provided at the shearing position and closer to the forging die from the shearing position. a drive body that reciprocates between the drive body; an annular cutter that is attached to the drive body and comes into contact with the shearing die when the drive body is in the shearing position; and an annular cutter that is attached to the drive body so that its position can be adjusted. a stopper having a protrusion formed on its outer periphery; and a long groove is fitted into the protrusion to allow the stopper to freely slide in the axial direction, and the stopper is always retracted from the abutment surface of the stopper due to spring elasticity. a protruding pipe that is fixed to the stopper so that its tip end surface matches the shearing surface of the cutter and that fits tightly into the hollow wire; a floating core metal that is pressed against the fixed core metal by frictional force; a pusher pin that pushes the ejection tube at the material projection position to eject the sheared hollow material from the cutter; and a pusher pin that pushes the sheared hollow material out of the cutter, and pushes the ejected hollow material toward the front of the heading die. A homer comprising: a transport device for transporting;