JPH0763773B2 - Manufacturing method of goby joint pipe - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a goby joining pipe formed by joining both ends of a metal plate to a goose joining.

(Prior Art) A pipe formed by interlocking bent portions provided on both end portions of a metal plate on the inside and jointing them with a goby is usually formed by an apparatus as shown in FIG. Manufactured.

That is, first, in a manufacturing line in which the pipe is continuously bent and formed, the bent portions at both ends of the metal plate can be joined to each other via the core for splicing and joining. The pipe main body after the seam splicing and joining is transferred as it is to the caulking fixing portion A by the forming roll.

The caulking fixing portion A is composed of upper and lower forming rolls B, a core C inserted into the pipe body P, and a crimping roll D rotatably supported by the core C. Pipe body P
The seam splicing joint part H is the upper forming roll B1 and the crimping roll D.
And the lower surface of the pipe body P is inserted between the lower forming roll B2 and the bottom surface of the core C.

A knurl E is engraved on the circumferential surface of the crimp roll D in the axial direction thereof, and while the pipe main body P is being conveyed, a ridge portion of the knurl E continuously forms a crimp mark F in a direction orthogonal to the conveying direction. At the same time, the seam joint portion H is fixed by crimping.

However, in the case of this technique, the diameter of the crimping roll D is limited due to the relationship with the pipe body P, and if the ridges of the knurls E are to be formed high, the gap between the ridges must be widened and the crimping roll D Since the rotation of does not go smoothly, it is not possible to set the height of the mountain portion so high actually. Therefore, in the conventional method, the sixth method is used.
As shown in the figure, sufficient crimping force is not transmitted to the lower layer, so that not only can secure fixation be prevented, but also the pivotal movement of the crimping roll D directly affects the depth of the crimping marks to manufacture. This may result in inconsistent pipe quality.

Further, when the caulking is performed, the seam joint H receives a pressure almost close to a surface pressure state due to the knurled ridges, so that the thin plate is rolled. This also applies to the bottom surface of the core C and the bottom surface of the pipe body pressed by the lower roll B2. Moreover, in some cases, the splice joint H reaches the yield point and extends in the lateral direction to further deteriorate the crimping.

(Object) In view of such a point, the present invention provides a method for manufacturing a goby connecting pipe that reliably presses the goby connecting portion regardless of the thickness of the plate and does not cause rolling or the like in the case of a thin metal plate. That is the purpose.

(Structure) In order to achieve the above-mentioned object, the present invention forms a goby joint by bending the bent portions provided at both end portions of the metal plate material to each other, and press-bonds the crimp roll to the goby joint. Thus, in the method for manufacturing a goby connecting pipe by caulking the goby connecting portion, a crimping roll having a plurality of circumferentially extending pressure welding projections provided at intervals in the same direction is used. The core inserted into the pipe-shaped metal plate with the joint is rotatably supported, and the crimping rolls are positioned between the forming rolls above and below the pipe, so that the crimping ridges for the crimping rolls are formed. The pipe-shaped metal plate is brought into contact with the seam joint on the inner surface, and while the pipe-shaped metal plate is conveyed by the forming roll, the crimping roll is rotated and the press-contact ridge is pressed onto the seam joint. And carry it to the seam joint. It is characterized in that it manufactures a goby joint pipe having a crimping mark in the form of a slender broken line in the feeding direction.

(Examples) Hereinafter, the present invention will be described in detail based on illustrated examples.

1 to 4 show an embodiment in which the method of the present invention is applied to a manufacturing line for a metal square pipe, and FIG. 4 shows an outline of the manufacturing line.

In the figure, the metal plate is pulled out and transferred from the right side to the left side. At a position of reference numeral 1, a primary bent portion (not shown) for primary bending a metal plate into a predetermined angular shape to form the pipe body P is provided. Reference numeral 2 is a goby joint operation portion for joining the above-mentioned bent portions of the pipe body P, which have been transferred over the bent portions at both ends, to each other to make a gore joint connection.
It is a caulking fixing part where a square pipe is obtained by caulking.

In the goby splicing operation part 2 and the crimping fixing part 3, since the goby splicing joint part H is formed on the inner surface side of the pipe body P, the core
4,5 are used. The cores 4 and 5 are fixed to a rod 7 protruding from a support body 6 provided between the primary bending portion 1 and the goby splicing operation portion 2, and inserted into the pipe body P. Although not shown, the core 4 for seam splicing and joining is provided with a recess for press-fitting while joining the bent portion of the end of the pipe body to the seam for splicing.

The caulking fixing portion 3 will be described with reference to FIGS. 1 and 2. The core 5 is fixed to the tip of a rod 7 projecting forward from the support body 6, and a crimping roll 8 is rotatably supported therein. Has been done. The pressure bonding roll 8 is formed in a roll shape having a peripheral surface slightly narrower than the width of the seam joint portion H, and four pressure contact pieces 9 are provided at intervals in the peripheral direction at the center of the peripheral surface in the width direction. Has been done. This press-contact piece 9 extends for a required length in the circumferential direction of the pressure roll, and has a height required for the tip portion protruding from the upper surface opening of the core 5 to bite into all the layers of the seam joint portion H. ing. Then, the press contact piece 9 is pressed against the surface of the seam splicing joint portion of the pipe body P interposed between the upper roll 10 and the core in a direction parallel to the conveying direction of the pipe body P. A space is maintained between the pressure contact pieces 9 so that the pressure-bonding roll 9 can be rotated without trouble as the pipe body P is transferred. The number and the length of the pressure contact pieces 9 are different from those of the pipe body P. It is appropriately set according to the plate thickness and the like.

Therefore, when the pipe body P reaches the crimping portion, the goby joint portion H receives the pressing force of the upper forming roll 10 and is pressed against the pressure contact piece tip portion 9a of the crimping roll 9 while moving forward. The press contact piece 9 is rotatably supported by the core 5 and is stopped 5
Is fixed to the rod 7 and is in sliding contact with the lower surface of the pipe body, the goby joint portion H is caulked by the pressure contact piece tip 9a, and the elongated crimp in the direction parallel to the conveying direction of the goby joint portion H is performed. Traces 11 are formed intermittently. Since the crimping mark 11 has a sufficient height for the crimping piece 9, a deep groove is formed, and as shown in FIG. 3, the crimping mark 11 penetrates into all the layers of the seam joint H to completely remove the caulking. Is what you do.

Moreover, since the press contact piece 9 is only in line contact with the seam joint H at this caulking portion, the seam joint H is not rolled, and the bottom surface of the core 5 is also a contact portion above. As described above, since it is a line contact, it is possible to reduce the rolling of the lower surface of the pipe body as much as possible.

(Effect) As described above, according to the present invention, as the crimp roll for crimping and fixing the goby joint, one having a press-contact ridge extending in a direction parallel to the transport direction of the metal plate is used.
The pressure contact ridges can be made high, not only can the goby joint be deeply crimped regardless of the thickness of the metal plate, but the goby joint can be reliably crimped. It is possible to perform qualitatively stable caulking without being affected.

In addition, since the press-contacting projection eventually presses the goby joint by linear pressure, there is no need to roll the goby joint,
Further, since the contact portion at the upper side of the core bottom surface is a line contact, rolling of the lower surface of the pipe body can be reduced as much as possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a caulking device according to an embodiment of the present invention,
FIG. 2 is a perspective view showing a main part thereof, FIG. 3 is a sectional view of the same apparatus, FIG. 4 is an explanatory view showing an outline of a square pipe manufacturing line in which the present invention is carried out, and FIG. FIG. 6 is a perspective view showing a caulking portion of a goby splicing joint portion according to a conventional device. A, 3 …… Crimping fixing part, B …… Molding roll, C, 4,5 …… Core, D, 8 …… Crimping roll, E …… Knurled, F, 11 …… Crimping mark, P …… Pipe Main unit, H ... Goby splicing joint 1 ... Primary bending part, 2 ... Goby splicing operating part, 7 ... Rod, 9 ... Pressure contact piece, 10 ... Upper roll,

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-54-112776 (JP, A) JP-B-40-23773 (JP, B1)

Claims (1)

[Claims] Claim: What is claimed is: 1. A goby joint is formed by interlocking bent portions provided at both end portions of a metal plate member, and a press roll is pressed against the goby joint, thereby caulking and fixing the goby joint. In the method of manufacturing a goby splicing pipe, a crimping roll having a plurality of circumferentially extending pressure welding projections projecting at intervals in the same direction is formed on a pipe-shaped metal plate on which a goby splicing portion is formed. It is rotatably supported by a core inserted inside, and the crimping roll is positioned between the forming rolls above and below the pipe, and the crimping roll press-contact ridges are formed on the inner surface of the pipe-shaped metal plate. While the pipe-shaped metal plate is being conveyed by the forming roll, the crimping roll is rotated to bring the pressure-contacting ridge into pressure contact with the seam joint, and the seam is elongated in the conveying direction. Has a crimp mark in the shape of a broken line Producing zero joint pipe, a manufacturing method of goby joint pipe, characterized in that.