JP2003103309A - Method and apparatus for dividing end portion of metal tube and link component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a tabular portion of a fitting bracket integrated with a metal tube. SOLUTION: A pair of dies 15 are brought closely to each other and pressed externally against a steel tube 13 and a punch 17 for groove working is inserted from the end opening 13a of the steel tube 13, and through a reciprocal action by a die 15 and the punch 17 for groove working, the groove working is executed in two places exposed to each other with the prescribed length along the tube axial direction from one end section of the steel tube 13. The other end side of the steel tube 13 is confined by a pressing block 19 and at the same time, a punch 25 for dividing whose tip end is conically shaped and outside diameter of the rear end section is larger than the inside diameter of the steel tube 13 is inserted from the opening 13a of the steel tube 13, and the one end section of the steel tube 13, being pressed and enlarged, is divided into two, bordering the groove working region. A flat punch 27 having planar both side surfaces is inserted into each two divided regions 13d and between the flat punch 27 and an abutment 23 arranged outside the two divided regions 13d, the two divided regions 13d are flattened so as to form the fitting bracket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for splitting an end portion of a metal pipe, a splitting device for splitting the end portion of the metal pipe, and a link component.

[0002]

2. Description of the Related Art As a link component constructed by providing a bracket for mounting to another component at the end of a conventional steel pipe, as shown in FIG. Are joined by welding. The above-described mounting bracket 3 has a pair of flat plate portions 3b that are bent from both ends of a substrate portion 3a that is welded to the end portion of the steel pipe 1 and that face each other, and a mounting hole 3c is formed in this flat plate portion 3b. Has been done.

[0003]

However, in such a conventional link component, since the mounting bracket 3 is a separate component from the steel pipe 1, it is necessary to perform welding work between components. In addition to being complicated, two parts are required, so that part management becomes complicated, and improvements are desired.

As a countermeasure against this, in manufacturing the above-mentioned link component, the end of the metal pipe is divided into two parts, and the divided part is used as a mounting bracket so that the mounting bracket is integrated with the steel pipe. can do.

As shown in FIG. 5, as a processing method having such an integrated structure, a pair of dies 7 are pressed from both upper and lower sides of the steel pipe 5, and in this state, the punch 9 is opened from the end opening of the steel pipe 5. It is possible to insert and shear.

However, in this case, as shown in FIG. 6 showing the state of the steel pipe 5 after processing, the ends of the divided portions 11 on one side half are bent inward with the shearing portion S as a boundary, and the deformation is large. Therefore, it is difficult to form the flat plate portion 3b like the mounting bracket 3 shown in FIG. 4, and it is difficult to integrate the mounting bracket with the steel pipe 5. .

Therefore, an object of the present invention is to facilitate formation of a flat plate portion of a mounting bracket integrated with a metal tube.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 is such that one of the metal tubes is pressed against the metal tube while the pair of dies are pressed toward each other from the outside. A groove punch is inserted from an end opening, and the die and the groove punch are interacted with each other to face each other by a predetermined length along the pipe axial direction from one end of the metal pipe. Grooving is applied to a part to restrain the other end side of the metal pipe, and the tip from the one end opening of the metal pipe is conical and the outer diameter on the rear end side is larger than the inner diameter of the metal pipe. A punch for splitting is inserted, and one end of the metal pipe is split into two with the groove processing site as a boundary while pushing and widening, and between the two split sites, both side surfaces are flat. Insert a flat punch and the outside of the flat punch and the two divided parts. Between the arranged the receiving surface, there the two divided portions as end divided method for a metal tube flattened.

According to a second aspect of the present invention, in the method of dividing an end portion of a metal pipe according to the first aspect of the present invention, before grooving the metal pipe, one end portion of the metal pipe is arranged along the pipe axial direction. Holes are formed at two locations facing each other separated by a predetermined length.

According to a third aspect of the present invention, a pair of dies that press the metal tube from the outside so as to approach each other, and the die is inserted through one end opening of the metal tube, thereby interacting with the die. With this, a groove machining punch that performs groove machining at two locations facing each other for a predetermined length along the tube axis direction from one end of the metal pipe, and the other end of the metal pipe is restrained. While inserting the metal pipe from one end opening of the metal pipe, the one end of the metal pipe is divided into two with the groove processing site as a boundary while spreading the metal pipe. A split punch whose outer diameter on the rear end side is larger than the inner diameter of the metal pipe and the other end side of the metal pipe is restrained by a restraint tool, and is inserted between the two split portions of the metal pipe. By doing so, between the receiving surface arranged outside the two divided parts And flattening the two divided portions, both side surfaces is configured to have a planar flat punch.

According to a fourth aspect of the invention, in the configuration of the third aspect of the invention, a groove is formed on the outer periphery of the groove punch corresponding to the shape of the tip projections of the pair of dies.

According to a fifth aspect of the present invention, in the structure of the third or fourth aspect of the invention, the restraints are provided on their abutting surfaces,
The metal tube is composed of a pair of pressing blocks each having a semicylindrical shape having a radius approximately equal to half the outer diameter of the metal tube and having a recess capable of accommodating the metal tube.

According to a sixth aspect of the invention, in the configuration of the fifth aspect of the invention, each receiving surface arranged outside the two divided portions is integrated with each of the pair of pressing blocks.

According to a seventh aspect of the present invention, a pair of dies are pressed against the metal tube from the outside so that the die for punching is inserted from one end opening of the metal tube.
Due to the interaction between the die and the grooving punch, grooving is performed at two locations facing each other for a predetermined length along the pipe axial direction from one end of the metal pipe, and the other end of the metal pipe is provided. While restraining the end side of the metal pipe, a split punch is inserted from one end opening of the metal pipe with a conical tip and an outer diameter on the rear end side larger than the inner diameter of the metal pipe. One end portion is divided into two with the groove processing portion as a boundary while pushing and expanding, and a flat punch having flat sides on both sides is inserted between the two divided portions, and the flat punch and the above The link component is a link component that is formed by flattening the two divided portions between the receiving surface arranged outside the two divided portions.

[0015]

According to the first aspect of the invention, the end of the metal tube is divided into two parts by the dividing punch with the groove processing part as a boundary, and the two divided parts are flattened by the flat punch. Therefore, when the end portion of the metal pipe is divided into two, the end portion of the divided portion can be prevented from being deformed inward, and the flat plate portion can be easily formed.

According to the second aspect of the present invention, when one end of the metal pipe is expanded by the groove punch, deformation such as cracking of the metal pipe at the end of the groove portion can be prevented. it can.

According to the third aspect of the present invention, a pair of dies and a groove punch are used to form a groove on the end of the metal tube, and the groove is divided into two parts with the groove punch as a boundary. , With the flat punch inserted between these two divided parts, the two divided parts are flattened, so when the end of the metal pipe is divided into two, the end of the divided part is deformed to the inside. Can be prevented, and the flat plate portion can be easily formed.

According to the invention of claim 4, the protrusion shape of the die is pushed into the groove of the groove punch, so that the groove can be easily processed.

According to the fifth aspect of the invention, the metal pipe is formed by a pair of pressing blocks having a semicylindrical shape having a radius approximately equal to half the outer diameter of the metal pipe and having a recess capable of accommodating the metal pipe. By pressing, the metal pipe can be surely restrained.

According to the invention of claim 6, by integrating the receiving surface with the pressing block, the entire apparatus is simplified.

According to the invention of claim 7, the end portion of the metal pipe is divided into two parts by the dividing punch with the groove processing part as a boundary, and the two divided parts are flattened by the flat punch and attached. Since it is a bracket for use, it is possible to obtain a link component in which a mounting bracket integrated with a metal tube can be easily formed into a flat plate.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 (a), 1 (b) and 1 (c) are working process diagrams showing a method of dividing an end portion of a metal tube according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b). , (C) are perspective views of a work corresponding to each work process. First, Fig. 1
As shown in (a), a steel pipe 1 which is a metal pipe as a work.
Steel pipe 1 by a pair of dies 15 arranged above and below
2 (a) by inserting the groove processing punch 17 from the one end opening 13a of the steel pipe 13 while pressing a predetermined length from one end of the steel pipe 3 along the pipe axis direction. As shown, the V-shaped grooves 13b are formed on the upper and lower surfaces of the steel pipe 13 at two locations facing each other for a predetermined length along the pipe axis direction.
Is processed. Steel pipe 13 corresponding to the end of this groove 13b
Holes 13c are preliminarily processed on both upper and lower surfaces of the.

The groove 13b of the steel pipe 13 may be a slit. That is, by forming a slit, the portions on both sides of the groove (slit) 13b may be completely separated from each other.

The die 15 described above is a V for forming the groove 13b from one end of the steel pipe 13 to the hole 13c.
It is provided with a character-shaped protrusion-shaped portion 15a. On the other hand, the groove punch 17 has a tapered portion 17a having a small diameter at its tip, and a V-shaped groove 17b is formed along the longitudinal direction corresponding to the protruding portion 15a of the die 15. There is. By providing this groove 17a, the above-mentioned groove 1
Although the 3b is easily processed, the groove 17b may be omitted.

As shown in FIG. 2 (a), the steel pipe 13 having the groove 13b formed has a pair of pressing blocks as the restraint shown in FIG. 1 (b) on the other end side where the groove 13b is not formed. By 19, the periphery of the steel pipe 13 is pressed and restrained.
The pair of pressing blocks 19 are formed with semi-cylindrical recesses on their abutting surfaces 21 that can accommodate the steel pipes 13 and have a radius approximately equal to half the outer diameter of the steel pipes 13. By abutting with the steel pipe 13 accommodated in this recess, the periphery of the steel pipe 13 can be uniformly and surely restrained and pressed.

The above-mentioned pressing block 19 has a groove 13b.
Flat plate-shaped receiving surfaces 23 are formed on both sides of the steel pipe 13 in which the portions are formed. By integrating the receiving surface 23 with the pressing block 19, the simplification of the entire apparatus can be achieved as compared with the case where the receiving surface 23 is provided separately. The receiving surface 23 described above
With respect to the steel pipes 13 arranged between each other, from one end opening 13a thereof, a split punch 25 shown in FIG.
Insert.

The split punch 25 is provided with a conical insertion portion 25a at the tip, and a shaping portion 25b having an outer diameter larger than the inner diameter of the steel pipe 13 on the rear end side. This split punch 25 is attached to one end opening 13a of the steel pipe 13.
By inserting from above, the steel pipe 13 is spread to the left and right with the upper and lower grooves 13b as boundaries, and as shown in FIG.
It is divided into two divided portions 13d. At this time, steel pipe 1
Since the hole 13c is pre-machined at the end of the groove 13b formed in No. 3, the steel pipe 13 at the end of the groove 13b is formed.
It is possible to prevent deformation such as cracks.

Further, as shown in FIG. 1 (c), by inserting the flat punch 27 between the two divided portions 13d of the steel pipe 13, the two divided portions 13d are formed as shown in FIG.
As shown in (c), it is formed in a flat plate shape. The flat punch 27 is provided with a flat surface portion 27a whose both side surfaces corresponding to the above-mentioned two divided portions 13d are flat, and two tapered surfaces 2 whose distal end is tapered from the flat surface portion 27a.
7b is provided.

By inserting the flat punch 27 described above between the two divided portions 13d of the steel pipe 13, the two divided portions 13d are gradually spread by the tapered surface 27a, and finally the flat portion 27a and the pressing block. The two divided portions 13d are formed in a flat plate shape between the receiving surface 23 and the receiving surface 23 of 19. Then, in this flat plate-shaped divided portion 13d,
By processing the mounting hole 13e as shown in FIG. 3, the divided portion 13d becomes a mounting bracket for other components not shown.

As described above, by making the mounting bracket (divided portion 13d) a link part integrally provided in the steel pipe 13, the work such as the welding work between the parts becomes unnecessary, and the work becomes easy. Since only one steel pipe 13 is required, parts management becomes easier.

When the end portion of the steel pipe 13 is divided into two divided portions 13d, the divided punch 17 is divided into two with the groove 13b as a boundary, and then the two divided portions 13d are flat punch 27. Since the steel plate 13 is flattened in the above manner, when the end portion of the steel pipe 13 is divided into two, the divided portion end portion can be prevented from being deformed inward, and the flat plate portion can be easily formed.

[Brief description of drawings]

FIG. 1 is a working process diagram showing a method of dividing an end portion of a metal pipe according to an embodiment of the present invention, in which (a) is a process of grooving a steel pipe with a pair of dies and a grooving punch; (b) is a step of dividing the end of the steel pipe with a dividing punch while restraining the steel pipe with a pressing block, and (c) is a step of flattening the divided end with a flat punch.

2A and 2B are perspective views showing the shape of a work corresponding to the work process of FIG. 1, in which FIG. 2A is the one after processing in the process of FIG. 1A, and FIG. 2B is the process of FIG. After processing in
(C) is after processing in the step of FIG. 1 (c).

FIG. 3 is a perspective view showing a shape of a final link component obtained by processing a mounting hole in the work of FIG. 2 (c).

FIG. 4 is a perspective view of a link component in which a conventional mounting bracket is separated from a steel pipe.

FIG. 5 is an operation explanatory view showing a conventional processing method for integrating a mounting bracket in a link component with a steel pipe.

6 is an explanatory view of a steel pipe whose end is divided into two by the processing method of FIG.

[Explanation of symbols]

13 Steel pipe (metal pipe) 13a One end opening 13b groove 13c hole 13d division part 15 dies 17 Grooving punch 17b groove 19 Pressing block (restraint) 23 Receiving surface Punch for 25 divisions 27 Flat punch

Continued front page    (72) Inventor Shuji Saito             Nissan, Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan             Inside the automobile corporation

Claims (7)

[Claims] 1. A grooving punch is inserted from one end opening of the metal tube while pressing a pair of dies from the outside toward the metal tube while pressing the dies, and the die and the grooving die are pressed. Due to the interaction with the punch, two metal grooves are machined from one end of the metal pipe at a predetermined length along the pipe axial direction to face each other, and the other end of the metal pipe is restrained. While inserting a split punch from one end opening of the metal pipe, the tip of which is conical and the outer diameter of the rear end side of which is larger than the inner diameter of the metal pipe, the one end of the metal pipe is pushed. While expanding, divide it into two with the grooved part as a boundary, insert a flat punch with flat sides on both sides between the two divided parts, and place the flat punch and the outside of the two divided parts. The two divided parts should be flattened with the receiving surface to be placed. And a method for dividing an end portion of a metal pipe, characterized by: 2. Prior to grooving the metal pipe, two holes facing each other at a position separated by a predetermined length along the pipe axial direction from one end of the metal pipe are drilled. The method for dividing an end portion of a metal pipe according to claim 1, wherein 3. A pair of dies that press against a metal tube from outside and press the metal tube from one end opening of the metal tube, and the metal tube interacts with the dies to interact with the metal tube. While grooving punches that perform grooving at two locations facing each other for a predetermined length along the pipe axial direction from one end of the metal pipe and the other end of the metal pipe with a restraint, By inserting from one end opening of the metal pipe, one end of the metal pipe is divided into two with the groove processing site as a boundary while spreading and spreading, the tip is conical and the rear end side An outer diameter of the splitting punch is larger than the inner diameter of the metal pipe, and while restraining the other end side of the metal pipe with a restraint, by inserting between the two split portions of the metal pipe, Between the receiving surface arranged outside the two divided parts, the two divided parts An end-dividing device for a metal tube, characterized in that it has flat punches having flat surfaces on both sides for flattening a part. 4. The end dividing device for a metal pipe according to claim 3, wherein a groove is formed on the outer periphery of the groove processing punch so as to correspond to the tip projection shapes of the pair of dies. 5. A pair of pressing blocks, each of which has a concave portion capable of accommodating the metal pipe, wherein the restraint is a semi-cylindrical shape having a radius substantially equal to a half of the outer diameter of the metal pipe on the abutting surfaces. 4. The method according to claim 3, wherein
Alternatively, the end dividing device for the metal tube according to the item 4. 6. The end dividing device for a metal pipe according to claim 5, wherein each of the receiving surfaces arranged outside the two divided portions is integrated with each of the pair of pressing blocks. 7. A groove machining punch is inserted from one end opening of the metal tube while pressing a pair of dies toward each other from the outside against the metal tube to press the die and the groove machining. Due to the interaction with the punch, two metal grooves are machined from one end of the metal pipe at a predetermined length along the pipe axial direction to face each other, and the other end of the metal pipe is restrained. While inserting a split punch from one end opening of the metal pipe, the tip of which is conical and the outer diameter of the rear end side of which is larger than the inner diameter of the metal pipe, the one end of the metal pipe is pushed. While expanding, divide it into two with the grooved part as a boundary, insert a flat punch with flat sides on both sides between the two divided parts, and place the flat punch and the outside of the two divided parts. From the receiving surface to be placed, flatten the two divided parts. Link parts characterized by being attached brackets.