JPH0646586Y2 - Punching device in multi-stage press forming machine - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a punching device in a multi-stage forging machine, in which raw materials are sequentially and continuously formed from rough to fine by a plurality of sets of dies and punches. The present invention relates to a punching device that forms a hole in a direction orthogonal to the axial direction.

(Prior Art) A multistage forging machine is widely used as a molding machine for molding bolts, nuts, and other various parts. This multi-stage press forming machine has a plurality of forging stations in which a plurality of dies fixed to a die block and a plurality of punches that are advanced and retracted by a ram are arranged to face each other. It is configured such that the material sequentially supplied between the punch and the punch is continuously pressed from coarse to fine to obtain a product having a predetermined shape.

By the way, in this type of forging machine, when a punching station in which a punch for punching is attached to a ram is provided as the final station or an intermediate station of the above-mentioned stations, and the punching is performed continuously with the forging of the material. However, such punching punches attached to the ram can form only holes in the forging direction, that is, the axial direction of the material. Therefore, in the case of forming a hole in a direction orthogonal to the axial direction, conventionally, it was necessary to take out the raw material from the press forming machine and then separately perform a punching process with a dedicated machine.

On the other hand, as shown in Japanese Utility Model Publication No. 58-32827, for example, a punch for punching which moves forward and backward in the direction orthogonal to the axial direction of the die is provided, and the punch is held in the die by the punch. It is conceivable to form holes in the material.
According to this, it becomes possible to form a hole in a direction orthogonal to the axial direction on the side surface of a hollow material such as a cylindrical shape, for example, continuously with the forging process.

(Problems to be solved by the invention) However, when the die is provided with a punch for punching in a direction orthogonal to the axial direction as described above and the punching is performed on the side surface of the material by the punch, the punching is performed. Punch for
Since it cannot be driven integrally with the punch for punching by the ram, a separate driving means for the punch for punching is required, which considerably complicates the structure of the stamping machine.

In addition, particularly when performing punching on the side surface of the material in a direction orthogonal to the axial direction as described above, the material may be discharged from the die unless the punch for punching is reliably extracted from the material after the punching. If this is not possible, or the punch or the material will be damaged when ejected, the tip of the punch for punching will penetrate the side surface of the material and project into the inside. When pulling out the punch, a large frictional force acts, so that the punch cannot be reliably pulled out, which may cause the above-mentioned problems.

The present invention addresses the above situation in the prior art, and when performing punching on a side surface of a material in a direction orthogonal to its axial direction in a multi-stage press forming machine, the punch for punching is separately driven by a driving means. The punch for punching is moved by the movement of the ram to move back and forth without providing the punch, and in particular, the punch for punching is configured to be forcibly extracted from the material after punching. An object of the present invention is to make it possible to continuously perform the above-described punching of a product without complicating the structure of the molding machine and without damaging punches or materials. .

(Means for Solving the Problems) In order to achieve the above object, the punching device in the multi-stage press forming machine according to the present invention is configured as follows.

That is, this punching device has a plurality of forging stations in which a die fixed to a die block and a punch that is advanced and retracted by a ram are arranged to face each other. A die is provided at a punching station as a final station in a multi-stage press forming machine for press-forming a product, the die being fixed to the die block and storing the material, and the advance of the ram fixed to the ram. Sometimes, a punch for inserting and fixing the material in the die and a guide hole opened in the inner surface of the material accommodating recess in the die are inserted into the die to advance and retreat in the direction orthogonal to the axial direction of the die, whereby the tip portion is recessed. A punching punch that is capable of plunging and retracting into the inside and a cam machine that abuts against a member on the ram side and is pushed into the die when the ram advances. A driving member for causing the tip end portion of the punch punch to project into the material accommodating recess through the die, and a die for driving the driving member when the driving member is engaged and swings in a direction in which the engaging portion moves to the ram side. With a cam follower to pull out from inside,
A cam member that is fixed to the ram and swings the cam follower in the above direction when the ram moves backward.

(Operation) According to the above configuration, when the material is supplied to the punching station as the final station in which the punching device is provided and the ram advances, the punch attached to the ram causes the punch to be attached to the material and the material storage concave portion of the die. The driving member is pushed into the die by the advance of the ram while being inserted and fixed therein, and the punching punch provided in the die is driven in the direction orthogonal to the axial direction via the cam mechanism.
The tip portion thereof is projected into the material storage recess. As a result, a hole is formed on the side surface of the material inserted in the recess in a direction orthogonal to the axial direction of the material.

Also, after the holes are formed on the side surface of the material in this way,
When the ram retreats, the cam member fixed to the ram also retreats, causing the cam follower to swing in the direction in which the engaging portion with the drive member moves to the ram side, and the drive member from the die. Therefore, the punching punch penetrating the side surface of the material is forcibly withdrawn from the material.

In this way, it becomes possible to form a hole on the side surface of the material without separately providing a driving means for the punch, and the punch is reliably extracted from the material after the punching, and the punch and the material are not damaged. Will be prevented.

(Example) Hereinafter, the Example of this invention is described.

First, the schematic structure of the multi-stage forging machine according to the present embodiment will be described. As shown in FIG. 1, the forging machine 1 includes a die block 2 fixed to a machine base (not shown), The die block 2 has a ram 3 which is disposed so as to face the die block 2 and moves forward and backward with respect to the block 2. On the front surface of the die block 2, a plurality of dies 4 ₁ to ₄ 4 ranging from rough to fine are mounted via the die holders 5 _{1 to} 5 ₄ and arranged in a line, and a wire is attached to one end. Cutter 6 that cuts to a specified size
Is provided. On the other hand, on the front end face of the ram 3, punch holders 7 _{1 to} 7 ₄ are arranged in parallel so as to face the respective dies 4 ₁ to 4 ₄ and these punch holders 7 _{1 to} 7 ₄ are arranged on the respective die. Punches 8 ₁ to 8 ₄ paired with 4 ₁ to _{4 4} are provided so as to project forward. Then, a columnar material A as shown in FIG. 2 (1) cut into a predetermined size by the cutter 6
But die 4 ₁ by being sequentially supplied by to 4 ₄ and the punch 8 _{1-8 4} and the supply device to the four forging stations I~IV disposed opposite (not shown), FIG. 2 (2) , A cylindrical hollow material (intermediate product) B having a partition wall B ₁ at the front and a small hole B ₂ formed at the center of the partition wall B _1.
Is to be pressed. Then, the material B is supplied to the punching station V as the final station of the forging machine 1 in which the punching die 9 and the punch 10 are further opposed to each other, and as shown in FIG. A final product C having holes C ₁ and C _{1 in} a direction orthogonal to the axial direction at two side surfaces is obtained.

Next, the structure of the punching station V will be described with reference to FIGS. 3 to 5. In the station V, as shown in FIG. 3, a die holder 11 fixed to the die block 2 is provided with a guide sleeve 12 from the back. The spacer 13 and the die 9 are fitted together, and a hollow guide pin 14 whose rear end is fixed to the spacer 13 is provided at the center of the die 9 over substantially the entire length of the die 9. A stripper 15 is slidably fitted on the pin 14 so as to be slidable. In addition, the spacer 13 has two push rods.
16, 16 are held so as to be able to move forward and backward, and a knockout pin 17 is slidably fitted to the guide sleeve 12, and when the knockout pin 17 advances, the knockout pin 17 is pushed through the push rods 16, 16. By moving the stripper 15 forward, the material stored in the material storage recess 18 at the front end of the die 9 is discharged forward from the die 9.

Further, as shown in the enlarged view of FIG.
1 in the direction orthogonal to the axial direction on both sides of the material storage recess 18
A pair of punch punch guide holes 19, 19 are formed, and
Perforation punches 20, 20 are slidably fitted and held in these holes 19, 19, respectively. This punch punch 20 has a holder 21
A cap 22 screwed to the holder 21 and a punch main body 23 having a base portion clamped between them and a tip protruding toward the material storage recess 18 side. Then, when the punch main body 23 advances in the guide hole 19, the tip portion of the punch main body 23 projects into the material storage recess 18 by a predetermined amount. Here, a hollow guide pin whose tip is located in the recess 18
The side surface of 14 is provided with punched waste discharge holes 14a, 14a corresponding to the positions where the punch bodies 23, 23 enter.

Further, the die 9 has a pair of drive member guide holes 24, 24.
Are formed so as to penetrate the punch guide holes 19 and 19 in the axial direction of the die 9 respectively, and a pair of punch driving members 25 and 25 are respectively formed in the holes 19 and 19 in the front-rear direction. It is slidably fitted. The drive member 25 is in the shape of a cylinder, and the oblique upper surface of the latter half of the drive member 25 is notched, and the notch 25a is provided with a protrusion 25b that is inclined in a predetermined direction with respect to the axial direction. And this ridge 25b
In, the inclined groove 21a provided in the holder 21 in the punch punch 20 is engaged, the cam mechanism 26 is constituted by the protrusion 25b and the inclined groove 21a, each drive member 25, 25,
When the ram 3 is advanced, the screw members 28, 28 (third part) that protrude to the front surface of the punch case 27 that holds the punch 10 on the ram 3 side.
(See the figure) and pushed into the back of the guide holes 24, 24,
At this time, the punch punches 20, 20 are driven to the side of the material accommodating recess 18 so that the tip of the punch main body 23 is projected into the recess 18. Here, a spring receiving member 25c is arranged behind the driving member 25 in the guide hole 24, and the driving member 25 is moved by a spring (not shown) interposed between the member 25c and the spacer 13. It is biased forward.

On the other hand, as shown in FIG. 3, the punch case 27 is fitted and fixed in the punch holder 29 fixed to the ram 3, and the punch 10 is fitted in the case 27 so as to be slidable back and forth. Are held together. A spacer 30 is also slidably fitted behind the punch 10 in the punch case 27, and a spring is provided behind the spacer 30.
31 is mounted, and the punch 31 is urged by the spring 31 via the spacer 30 so as to project forward.

In addition to the above configuration, the punching station V is provided with a bar-shaped cam 32 extending toward the die holder 11 side below the punch case 27 on the front surface of the punch holder 29 fixed to the ram 3. This rod-shaped cam 32
A mounting member 33 whose base end is fixed to the punch holder 29.
It is fixed by using a holding member 34, and the tip portion is slidably fitted to a guide sleeve 35 provided on the die holder 11. The upper surface of the rod-shaped cam 32 has a lower cam surface 32a on the base end side and a higher cam surface 32a on the tip end side.
It is said that.

Further, on the front surface of the die holder 11, there is provided an L-shaped cam follower 37 whose central portion is swingably supported by a pin 36 so as to be located immediately above the rod-shaped cam 32. The roller 38 provided at one end is located on the cam surface 32a on the upper surface of the rod-shaped cam 32, and the other end of the cam follower 37 is bifurcated, and these bifurcated portions 37a and 37b are formed. Engagement holes provided at the front ends of the pair of drive members 25, 25 projecting forward from the die 9.
25d and 25d are respectively engaged. Then, as shown in FIG. 3, when the ram 3 is in the retracted position, the cam follower is
When the roller 38 at one end of the rod 37 is at a position where the cam surface 32a on the tip end side of the rod-shaped cam 32 is high, the cam follower 37 is in the a direction, that is, the branch portion 37 at the other end.
The engaging portions of the driving members 25, 25 with the engaging holes 25d, 25d of a, 37b are swung in the direction of moving to the ram 3 side, and the branch portion 37
a, 37b is in a state where the drive members 25, 25 are pulled out forward,
Further, when the ram 3 moves forward and the roller 38 is at the position where the cam surface 32a on the side of the base end portion of the rod-shaped cam 32 is low, the cam follower 37 is allowed to swing in the direction opposite to the a direction, and the above drive is performed. The retracting of the members 25, 25 is made possible. Here, the swing of the cam follower 37 in the a direction is regulated at a predetermined position by a stopper 39, and the cam follower 37 is constantly urged in the a direction by a spring 40 via a pusher 41. It is designed to prevent rattling. Also, in this embodiment, as shown in FIG. 4, the branch portion of the cam follower 37 is
The heights of the 37a and 37b are different, and accordingly, the positions of the pair of drive members 25 and 25 are also different. One is diagonally above the center of the die 9 and the other is diagonally below. It is provided. This is to avoid interference between the driving members 25, 25 and the material feeding device by feeding the material from the lower position where the driving members 25, 25 are arranged when feeding the material from the side. Since the punching station V is the last station, the material supplying device does not move to the driving member 25 having a high installation position.

Next, the operation of this embodiment will be described.

The material A shown in FIG. 2 (1) is sequentially supplied to the respective forging stations I to IV shown in FIG. 1, and the corresponding dies 4 ₁ to 4 ₄ and punches 8 ₁ to 8 _{4 at} these stations are supplied. With this, the press working is performed from coarse to fine to obtain a hollow intermediate material B as shown in FIG.

In this punching station V, as shown by the chain line in FIG. 5, the advance of the ram 3 is started when the material B is fed to the front position of the center of the die 9, and the punch holder 29 and the ram 3 are moved to the ram 3. As the punch 10 attached via the punch case 27 advances toward the die 9,
The material B is inserted into the material storage recess 18 of the die 9 while being fitted to the guide pin 14. Then, when the ram 3 or the punch 10 is advanced by a predetermined amount, the partition B _{1 of the} material B is fixed in the material storage recess 18 while being sandwiched between the guide pin 14 and the punch 10.

If the ram 3 further advances from this state, the
As shown in FIGS. 6 and 7, the punch 10 relatively retracts in the punch case 27 while compressing the spring 31, and only the punch case 27 advances together with the punch holder 29, and the screw member 28 protruding to the front surface thereof. , 28 abut the driving members 25, 25 protruding from the front surface of the die 9. When the ram 3 further advances in this state, the drive members 25, 25 are guided by the guide holes 2
The cam mechanism 26,2
The pair of punching punches 20, 20 are driven via 6 in a direction orthogonal to the axial direction of the die 9, and the tips of the punch main bodies 23, 23 project into the material accommodating recess 18. At this time, this recess
Since the material B is housed and fixed in the inside of the punch 18 as described above, the tip end portions of the punch main bodies 23, 23 of the punching punch 20 are provided with holes on the side surfaces of the material B. As a result, holes are formed on the side surface of the material in a direction orthogonal to the axial direction.

Here, in this embodiment, as shown in FIG.
The punched dust generated by the punching process is the discharge hole 14 on the side surface of the distal end portion of the hollow guide pin 14 inserted into the material B.
The air passage 27 is provided in the punch case 27 and the punch 10 while being discharged from the a and 14a into the guide pin 14.
The compressed air introduced from a, 10a through the small hole B ₂ in the partition wall B ₁ of the material B and the small hole 14b at the tip of the guide pin 14 is sent backward in the guide pin 14, Pin 14
It is designed to be discharged to the outside from a discharge port 14c provided on the side surface of the base portion of the.

In this way, when the boring process is completed, the ram 3 is retracted next. At this time, the rod-shaped cam 32 whose base end is fixed to the ram 3 via the punch holder 29 and the mounting member 33. Also by retreating, the roller at one end of the cam follower 37, which is swingably supported by the die holder 11, rides on the raised portion of the cam surface 32a of the rod-shaped cam 32, and the follower 37 is shown in FIG. 3rd from position
It will be swung in the direction a to the position shown in the figure. Therefore, the branch portions 37a and 37b of the follower 37 are connected to the engaging hole 25 at the tip.
The drive members 25, 25 engaged with d, 25d are guided by the guide holes 24, 24.
And a pair of punch punches 20, 20 via the cam mechanism 26 by the movement of the drive members 25, 25.
Will be forcibly retracted from the material storage recess 18.
As a result, even if a large frictional force acts on a portion of the punch body 23, 23 of the punching punch 20, 20 penetrating the side surface of the material B, the punch body 23, 23 can be reliably removed from the hole on the side surface of the material. Therefore, when the knockout pin 17 is advanced and the material B is discharged from the material accommodating recess 18 of the die 9 through the push rods 16 and 16 and the stripper 15, the material B and the above-mentioned material are removed. The punch main bodies 23, 23 are prevented from being damaged. Here, since the drive members 25, 25 are biased forward by a spring (not shown) installed behind the drive members 25, 25, when the ram 3 starts to move backward from the forward end, the tip of the drive members 25, 25 is moved toward the ram 3 side. Since the drive members 25, 25 start to move forward while being in contact with the screw members 28, 28, the cam followers 37 are forcibly pulled out forward as described above. The forward movement is smooth and reliable. The knockout pin 17 operates in conjunction with the advance and retreat of the ram 3, and the interlocking timing is the punch main bodies 23, 23 as the ram 3 retreats.
Is set to move forward after being extracted from the hole formed on the side surface of the material.

(Effect of the Invention) As described above, according to the punching device in the multi-stage press forming machine according to the present invention, the side surface of the hollow material is punched from a direction orthogonal to the axial direction of the hollow material. It is possible to perform it in conjunction with the movement of the ram used for press forming, without complicating the structure and increasing the cost such as when a separate drive device is provided for this type of punching, It will be possible to continue the forging process. And especially according to the present invention,
After punching, the punch punch is forcibly withdrawn from the material storage recess of the die or the side surface of the material in conjunction with the retreat of the ram, and the material cannot be discharged because the punch is not withdrawn. Or, the trouble of damaging the material or the punching punch by attempting to forcibly discharge it can be surely prevented.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a multistage forging and molding machine according to an embodiment of the present invention, and FIGS. 2 (1) to (3) are process diagrams showing a molding process of a product molded by the molding machine, respectively. Figure 3 is the first
FIG. 4 is an enlarged vertical sectional view of the punching station shown in FIG. 4, FIG. 4 is a vertical sectional front view of the die cut along the line IV-IV in FIG. 3, and FIG. 5 is a die cut along the line VV in FIG. Enlarged cross-sectional views, FIGS. 6 and 7 show operating states of the embodiment shown in FIGS.
It is sectional drawing corresponding to each figure. 1 ... Multi-stage press forming machine, 2 ... Die block, 3 ... Ram,
9 ... Die, 10 ... Punch, 18 ... Material storage recess, 20 ... Drilling punch, 25 ... Drive member, 26 ... Cam mechanism, 32 ... Cam member (rod-shaped cam), 37 ... Cam follower.

Claims (1)

[Scope of utility model registration request] 1. A die which is fixed to the die block (2) (4 ₁
And to 4 _4), advanced by the ram (3) has a punch (8 _{1-8 4)} and a plurality of forging stations formed by opposed to (I-IV) to be retracted, the material to these stations A punching device provided in a punching station (V) as a final station in a multi-stage press forming machine for sequentially supplying and press-forming hollow products, which is fixed to the die block (2) and stores a hollow material. Die (9)
A punch (10) fixed to the ram (3) for inserting and fixing a hollow material into the die (9) when the ram (3) advances, and a material storage recess (18) in the die (9).
It is inserted into a guide hole (19) opened on the inner surface of the die and moved forwards and backwards in a direction orthogonal to the axial direction of the die (9), so that the tip end thereof can be inserted and retracted into the recess (18). When the punching punch (20) and the ram (3) move forward, the punching punch (2) abuts against a member on the ram (3) side and is pushed into the die (9), and the punching punch (2) through the cam mechanism (26).
The drive member (25) that causes the tip of the (0) to project into the material storage recess (18) and the drive member (25) are engaged with each other, and the engaging portion moves toward the ram (3) side. The cam follower (37) pulls out the drive member (25) from the die (9) when the ram (3) moves, and the cam follower (37) is fixed in the ram (3) and swings in the above direction when the ram (3) moves backward. And a cam member (32) for moving the punching device in a multistage forging machine.