JPH0733430U - Press forming equipment for tubular parts with slits - Google Patents

Abstract

(57) [Summary] [Objective] When manufacturing a tubular part having a slit at one end by a multi-stage forging machine, it is possible to discharge the product from the slit forming station, and to improve the productivity of this kind of part. Realize improvement. [Structure] Die 25 of slit forming station X5
Inside the convex portion 47 for molding the slits 2 and 3 of the component 1.
d, 47e and the non-slit portions 4, 4 are fitted in the recess 47
f, 47f, and the slits 2 are formed by press-fitting the ends of the intermediate products formed at the preceding station.
3 is provided with a fixed punch 47, and an axial groove 47 extending over the entire length of the fixed punch 47 on the circumferential surface thereof.
g and 47g are provided, and the grooves 47g and 47g are formed after the press forming.
Knockout pins 48, 48 for pushing the end face of the non-slit portion 4 of the component 1 to eject the component 1 from the inside of the die 25 by sliding the inside of the die 1 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multi-stage forging forming device, and more particularly to an forging forming device for forming a tubular part having a slit on the peripheral surface of one end.

[0002]

[Prior art]

 For example, as disclosed in Japanese Utility Model Publication No. 5-30826, a die is fixed to a machine base and a punch is fixed to a ram that moves forward and backward with respect to the machine base to press a material into a predetermined shape. A multi-stage forging machine is known, in which a plurality of forging stations are provided and the raw material is sequentially supplied to these forging stations to form a product of a predetermined shape. When manufacturing a tubular part with a molding apparatus, the apparatus is configured as follows.

That is, as shown in FIG. 12, a fixed punch B having a diameter smaller than the inner diameter thereof is arranged inside the die A, and a cylindrical stripper C is arranged at the rear portion of the space formed between the two. A cavity D is formed by the inner peripheral surface of the die A, the outer peripheral surface of the fixed punch B and the front end surface of the stripper C, and the material is driven into the cavity D by the movable punch F so that A product E having a shape corresponding to the cavity D is formed. Then, after that, the product E is discharged from the die A by moving the stripper C forward.

[0004]

[Problems to be solved by the device]

 By the way, when the tubular product 1 having the slits 2 and 3 at one end as shown in FIGS. 13 and 14 is to be formed by the press forming apparatus having the above-described configuration, as shown in FIG. On the peripheral surface of the end portion of the fixed punch G, convex portions G1 and G2 are provided at the portions corresponding to the slit portions 2 and 3 of the product 1, and concave portions G3 are provided at the portions corresponding to the non-slit portion 4, respectively. It is conceivable to form the slits 2 and 3 as shown in FIGS. 13 to 15 by driving one end of a cylindrical material into the end of the punch G with a movable punch.

However, when the slits 2 and 3 are formed with such a configuration, the slit portions 2 and 3 and the non-slit portion 4 of the product 1 are firmly attached to the convex portions G1 and G2 and the concave portion G3 of the fixed punch G. They are in a meshed state, which makes it difficult to discharge the product 1 after molding.

As shown in FIG. 15, in particular, since the outer diameter of the fixed punch G becomes equal to the outer diameter of the product 1, a cylindrical shape fitted to the outer side of the fixed punch B as shown in FIG. The stripper C cannot push the end surface of the product 1. Therefore, in the past, it was impossible to manufacture a tubular part having a slit as described above with a forging machine, and the slit was formed in the tubular material by machining. .

Therefore, an object of the present invention is to make it possible to manufacture a tubular part having a slit at one end with a multi-stage forging machine.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is configured as follows.

That is, the forging / molding apparatus according to the present invention has a plurality of forging stations each having a die and a punch paired with each other. It manufactures tubular parts with axial slits in the front part, and the former stage forging station that preforms the slits at one end while forming the above material into a tubular shape, and the slit forming station following these stations. Inside the die of this slit forming station, there is a convex part for final forming the slit part of the part and a concave part to which the non-slit part is externally fitted, on the peripheral surface of the end. A fixed punch for final forming the slit by press-fitting the end of the formed intermediate product is provided, and the concave portion on the peripheral surface of the fixed punch is provided. By forming a groove in the axial direction over the entire length at a position corresponding to, and sliding forward in the groove after forging, the slit portion and non-slit portion mesh with the convex portion and concave portion of the fixed punch. It is characterized by comprising a knockout member for pushing the end surface of the non-slit portion of the product and discharging the product from the die of the station.

[0010]

[Action]

 According to the above configuration, in the die of the slit forming station, a fixed punch having a convex portion for finally forming the slit portion of the component and a concave portion to which the non-slit portion is fitted is formed in the former stage station. By punching the end of the intermediate product with the punch on the movable side, a slit of a predetermined shape is formed at the end of the intermediate product. The slit portion and the non-slit portion are firmly engaged with each other.

However, an axial groove is formed over the entire length of the peripheral surface of the fixed punch at a position corresponding to the recess, and the knockout member is advanced from the rear along the groove after the press forming. By pressing the end surface of the non-slit portion of the component, the component is reliably discharged from the die of the station.

[0012]

【Example】

 An embodiment of the present invention will be described below.

FIG. 1 shows a schematic structure of a multistage forging and molding apparatus 10 according to this embodiment. The forging and molding apparatus 10 includes six dies 21 to 26 arranged in parallel on a machine base 11, The ram 12 approaching and separating from the machine base 11 has the same six punches 31 to 36 mounted so as to face the above-mentioned dies 21 to 26, respectively, and the corresponding dies 21 to 26 and the punches. The stations 31 to 36 constitute five stages of forging stations X1 to X5 and the final stage auxiliary station X6.

Then, a material cutting device 13 provided at one end of the machine base 11 cuts a wire rod supplied from the outside into a predetermined size to form a material, and the material is formed by a chuck device (not shown). In addition to sequentially supplying to each station X1 to X6, in the first to fifth stations X1 to X5, the advance of the ram 12 drives the raw material-free intermediate products into the dies 21 to 25 through the punches 31 to 35, respectively. By molding into a shape corresponding to the cavities formed in these dies 21 to 25, the above raw material is manufactured into a final product of a predetermined shape, and at the auxiliary station X6, the scraps generated during the manufacturing of the product are discharged. It is supposed to do.

Here, depending on the forging / molding apparatus 10 according to this embodiment, as shown in FIG. 13 and FIG. 14 described above, there are two different shapes on the opposite side of 180 ° on the peripheral surface of one end. The tubular part 1 having the slits 2 and 3 is manufactured.

Next, the structures of the dies 21 to 26 and the punches 31 to 36 of the stations X1 to X6 in the forging and molding apparatus 10 will be described.

FIG. 2 shows a solid columnar material 100 formed by cutting the wire rod to a predetermined size by the material cutting device 13, and the material 100 is first supplied to the first station X1.

The configuration of the first station X1 is as shown in FIG. 3, and includes a die 21 on the machine base 11 side and a knockout pin 41 whose tip is exposed in the interior of the cavity forming recess 21a. A punch 31 is provided on the side of the ram 12, the tip of which is inserted into the recess 21a of the die 21 when the ram 12 is advanced.

The material 100 supplied into the recess 21a of the die 21 is removed from the inner peripheral surface or the inner peripheral surface of the recess 21a, the front end surface of the knockout pin 41 and the front end surface of the punch 31. The first intermediate product 101 corresponding to the shape of the cavity to be formed is molded, and after the punch 31 is retracted after the molding, the knockout pin 41 is advanced to move the first intermediate product 101. Is discharged from the die 21.

The first intermediate product 101 is supplied into the cavity forming recess 22a of the die 22 in the second station X2 shown in FIG. In the forging station X 2 as well, a knockout pin 42 whose front end is exposed to the inner part of the recess 22 a of the die 22 is provided, and the first intermediate product 101 is used for the inner peripheral surface of the recess 22 a of the die 22 or the inner peripheral surface of the recess 22 a. The second intermediate product 102 is shaped to correspond to the shape of the cavity formed by the peripheral portion of the inner surface, the tip surface of the knockout pin 42, and the tip surface of the punch 32 on the ram 12 side. Also in the forging station X2, the second intermediate product 102 is discharged from the die 22 as the knockout pin 42 advances.

Here, on the end surface of the second intermediate product 102 on the punch 32 side, a concave portion 102a for hollowing the product is formed by the protruding portion 32a at the tip of the punch 32. .

Next, the second intermediate product 102 is supplied to the third station X3 shown in FIG. 5, but at this time, the second intermediate product 102 is turned upside down, and the second station is turned on. The recess 102a formed by the punch 32 at X2 is directed toward the die 23 side and supplied into the die 23.

The die 23 is provided with a through hole 23a, and the recess 102a in the second intermediate product 102 is further deepened in the through hole 23a to fix the product into a hollow cylindrical shape with one end closed. The punch 43 is arranged, and a cylindrical stripper 44 is arranged between the outer peripheral surface of the fixed punch 43 and the inner peripheral surface of the through hole 23a.

Then, the second intermediate product 102 is driven into the through hole 23a of the die 23 by the punch 33 on the ram 12 side so as to have a cylindrical shape with one end closed and the inner periphery of the other end. The third intermediate product 103 provided with the chamfered portion 103a is obtained. Then, at the third station X3, the third intermediate product 103 formed as described above is discharged from the inside of the die 23 by the advance of the stripper 44.

The third intermediate product 103 is then supplied to the fourth station X4 shown in FIG. 6, and this fourth station X4 is also supplied to the die 24 similarly to the third station X3. A fixed punch 45 and a stripper 46 are provided in the provided through hole 24a, and two projections 46a and 46b are provided on the opposite side of 180 ° at the tip of the stripper 46 in the fourth station X4. It is being done.

Then, the third intermediate product 103 is driven into the die 24 by the punch 34 on the side of the ram 12, and as shown in FIG. 7, two slits are formed on the opposite side of 180 ° from the tip. The cylindrical fourth intermediate product 104 provided with the notches 104a and 104b is obtained. Further, also in the fourth station X4, the fourth intermediate product 104 is discharged from the inside of the die 24 as the stripper 46 advances.

As described above, the fourth intermediate product is formed into a tubular shape with one end closed, and the notches 104a and 104b, which are the original shapes of the slits 2 and 3 in the final product, are formed at the tip of the other end. 104 is supplied to the fifth station X5 having the configuration of the characteristic part of the present invention.

As shown in FIGS. 8 to 10, the fixed punch 47 arranged in the die 25 at the fifth station X 5 has a tip end portion having a small diameter corresponding to the inner diameter of the final product (cylindrical part) 1. The portion 47a and a rear portion thereof are formed as a large diameter portion 47b having a diameter corresponding to the inner diameter of the through hole 25a of the die 25, and a flange portion 47c is provided at the rear end and fixed inside the die 25. Then, on the peripheral surface of the small diameter portion 47a, two convex portions 47d, 47e corresponding to the shapes of the slits 2, 3 in the final product 1 and having the outer diameter equal to the large diameter portion 47b are provided on the opposite side of 180 °. The portions provided at the positions except these convex portions 47d and 47e are concave portions 47f and 47f.

Further, two grooves 47g, 47g extending from the rear end portion to the front end portion of the punch 47 are formed in the portion of the peripheral surface of the fixed punch 47 corresponding to the positions of the recesses 47f, 47f. In addition, knockout pins 48, 48 for sliding forward from the rear of the punch 47 in the grooves 47g, 47g are provided, and an extrusion shaft 49 for sliding the pins 48, 48 forward is provided. It is equipped at the rear.

On the other hand, the punch 35 on the ram 12 side in the fifth station X 5 has a cylindrical shape with an outer diameter equal to the inner diameter of the through hole 25 a of the die 25, and is used for punching in the cylindrical punch 35. The punch 50 is slidably fitted back and forth.

With such a configuration, the fourth intermediate product 104 punched into the through hole 25a of the die 25 by the punch 35 is attached to the small diameter portion 47a at the tip of the fixed punch 47 arranged in the die 25. The two protrusions 47d and 47e provided further deepen the notches 104a and 104b formed in the fourth station X4 to form the slits 2 and 3 in the tubular part 1 as the final product. The punching punch 50 advances, and the bottom portion 104c of the fourth intermediate product 104, which has closed one end, is punched out.

As a result, the tubular component 1 as a final product is obtained which has a tubular shape that completely penetrates and has two slits 2 and 3 at one end.

In this case, in the tubular part 1, the slits 2 and 3 are fixed in the through hole 25a of the die 25 with the tip fitted into the small diameter portion 47a of the tip of the fixed punch 47. The non-slit portions 4 and 4 are firmly engaged with the convex portions 47d and 47e of the tip 47 of the concave portions 47f and 47f, respectively, and the outer diameter of the component 1 is the large diameter portion of the fixed punch 47. Since it is equal to the outer diameter of 47b, the tubular part 1 cannot be discharged from the die 25 with the same configuration as the strippers 44 and 46 in the third and fourth stations X3 and X4.

Therefore, in the fifth station X5, knockout pins 48, 48 are provided in the two grooves 47g, 47g provided on the peripheral surface of the fixed punch 47 from the rear end portion to the front end portion of the punch 47. It is pushed by the rear push-out shaft 49 and moves forward, and the tip end thereof abuts on the end faces of the non-slit portions 4 and 4 of the component 1 and pushes the component 1 forward. As a result, the cylindrical part 1 as the final product is discharged from the die 25.

The tubular component 1 is further supplied to the auxiliary station X6 shown in FIG. 11, inserted into the through hole 26a of the die 26 at the station X6, and provided inside the die 26. While being sandwiched between the stripper 51 and the cylindrical punch 36 on the ram 12 side, the residue is left in the part 1 due to the forward movement of the dust removing punch 52 provided in the stripper 51 so as to be slidable back and forth. The leftover waste 5 (104) will be discharged. Then, thereafter, the stripper 51 moves forward and the tubular part 1 is discharged from the die 26.

[0036]

[Effect of device]

 As described above, according to the forging / molding apparatus of the present invention, when a tubular part having a slit at one end is manufactured, the slit part and the non-slit part of the part are provided in the die of the slit forming station. It will be in a state of firmly meshing with the convex portion and concave portion of the fixed punch to be formed, but the knockout member advances from the rear along the groove axially provided over the entire circumferential surface of this fixed punch. By pushing the end surface of the non-slit portion of the component, the component is reliably discharged from the die of the station.

As a result, it becomes possible to process the slits of the tubular part, which has been difficult to form by the conventional press forming apparatus, and the productivity of this kind of parts is improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a press forming apparatus according to an embodiment of the present invention.

FIG. 2 is a half sectional view showing a material used in the above device.

FIG. 3 is a cross-sectional view showing a configuration of a first station of the above device.

FIG. 4 is a sectional view showing a configuration of a second station of the same.

FIG. 5 is a sectional view showing the configuration of the third station.

FIG. 6 is a sectional view showing a configuration of a fourth station in the same manner.

7 is a cross-sectional view of the intermediate product taken along line yy of FIG.

FIG. 8 is a sectional view showing a configuration of a fifth station of the above apparatus.

9 is a sectional view taken along line zz of FIG.

FIG. 10 is a perspective view showing a fixed punch and a knockout pin at a fifth station and a final product molded at the station.

FIG. 11 is a cross-sectional view showing a configuration of a sixth station of the above apparatus.

FIG. 12 is a sectional view showing a general configuration of a conventional forging station.

FIG. 13 is a cross-sectional view of a tubular part manufactured by the device according to the present embodiment.

14 is a sectional view taken along line xx of FIG.

FIG. 15 is a perspective view for explaining a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical part 2,3 Slit 4 Non-slit part 10 Forging forming device 21-26 Dies 31-36 Punch 47 Fixed punch 47d, 47e Convex part 47f Recessed part 47g Groove 48 Knockout member X5 Slit forming station

Claims (1)

[Scope of utility model registration request] 1. A tubular component having a plurality of forging stations each having a die and a punch paired with each other, wherein a columnar material is subjected to a predetermined forging process through a forging station to produce a tubular part having an axial slit at one end. A press forming machine for forming, which has a preforming stage for forming a slit at one end while forming the material into a tubular shape, and a slit forming station following these stations, and a die for this slit forming station. Inside, there is a convex portion for final molding of the slit portion of the component and a concave portion to which the non-slit portion is fitted on the peripheral surface of the end portion, and the end portion of the intermediate product molded at the preceding station is press-fitted. Is provided with a fixed punch for finally forming the slit, and the entire length of the fixed punch is provided at a position corresponding to the concave portion on the peripheral surface of the fixed punch. By forming a groove in the axial direction over and sliding forward in the groove after forging,
The fixed punch is provided with a knockout member for pushing the end surface of the non-slit portion of the product in which the slit portion and the non-slit portion are engaged with the convex portion and the concave portion, and discharging the product from the die of the station. Press forming equipment for tubular parts with slits.