JP2000005833A - Metal plate seam part caulking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out a proper caulking without changing a pressing roll even when a thickness of a metal plate which forms a seam part is increased. SOLUTION: This device is an improved caulking device wherein a bent curving part is provided with both ends of a metal plate along a longitudinal direction, and the seam part 4 is formed by meshing with the curving parts each other. The seam part is then caulked by press contacting an upper roll member 6 and a press contacting roll 19 above and below the seam part. The press contacting roll is provided with a roll shape press contacting peripheral face 19a and a large diameter control face 19b at both sides of the peripheral face. A grooved open space 19c formed by the press contacting peripheral face and the control faces of both sides has a capacity needed for accepting and caulk fastening the seam part. At an edge part of the press contacting peripheral face located at a boundary of the press contacting peripheral face and the both control faces, a concave part 20 is formed for escaping purpose when the seam part is rolled. The concave part is preferably circularly continuous with the press contacting peripheral face edge part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved apparatus for caulking a gove joint of a metal plate.

[0002]

2. Description of the Related Art A manufacturing line shown in FIG. 5 is used to form, for example, a square pipe by joining both end portions of a metal plate inside with a goby joint. The metal plate is drawn and transferred from the right to the left in the drawing. At a primary bending portion (not shown), the metal plate is primarily bent into a predetermined angular shape to form the pipe body 1. The pipe 1 main body 1 is sent to the left with the bent pieces 1a, 1a formed on both side ends of the metal plate for the goby joint upward, and the two bent pieces 1a are connected to each other by the goby joint operating section 2. After being crossed, the goof joint 4 is fixed by caulking at the crimp fixing part 3.

As shown in an enlarged perspective view of FIG. 6, the caulking fixing portion 3 includes upper and lower forming rolls 6 and 7, a core 5 inserted into a pipe body via a rod 8, and a core 5 inside the core. And a pressure roll 9 rotatably supported by the roller. The goby joint 4 is inserted between the upper forming roll 6 and the pressure roll 9, and the lower surface of the pipe body is inserted between the lower forming roll 7 and the bottom surface of the core 5. As shown in FIG. 7, the pressing roll 9 has a press-contact peripheral surface portion 9 having substantially the same width W as the goby joint portion at the center.
a, and a guide plate 9b at both ends to regulate the width direction of the goby joint 4. The gove joint 4 is fitted into a groove space formed by the press contact peripheral surface 9 a of the pressure roll 9 and the inner wall surfaces of both guide plates, and is caulked by receiving the pressing force of the upper forming roll 6 and the pressure roll 9.

[0004]

At the time of caulking, the gob joint tends to extend in the width direction due to vertical pressing force, and the caulking is performed by regulating the guide plate 9b. In order to perform proper caulking, the width and height of the groove space should be substantially equal to the width and thickness of the goby joint 4. However, the thickness of the metal plate forming the pipe main body 1 is slightly different due to variations at the time of manufacture and the like.
Along with this, the width and thickness of the goby joints 4 are slightly different. Therefore, when the groove space is formed on the basis of the reference plate thickness, even if a gob joint formed by a metal plate having a plate thickness smaller than the reference is to be crimped, the crimping will be loose. On the other hand, if a gouge joint of a metal plate thicker than the standard is to be crimped, the axis of the pressure roll 9 is seized or the pressure roll 9 is broken or cracked. On the other hand, if the press roll 9 is replaced each time according to the thickness of the plate, the work requires time and labor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a caulking device for a goby joint, which can perform appropriate caulking without changing a pressure roll even when the thickness of a metal plate is increased.

[0006]

Means for Achieving the Object The present invention is characterized in that it has the following configuration to achieve the above object. That is, according to the present invention, a bent portion is provided along the longitudinal direction at both end portions of a metal plate, and an upper roll member and a pressure roll are pressed into contact with a goby joint formed by joining the bent portions together. This is an improved caulking device for caulking and fixing the goby joint. The pressure roll has a roll-shaped press contact peripheral surface and large diameter regulating surfaces on both sides of the press contact peripheral surface. The groove space formed by the press-contact peripheral surface and both regulating surfaces has a volume necessary to receive the goby joint and fix it by caulking. At the edge of the press-contact peripheral surface located at the boundary between the press-contact peripheral surface and the two regulating surfaces, a recessed portion for escape when the goby joint is rolled is formed. It is desirable that the escape recess be annularly continuous with the peripheral edge of the press contact.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment in which the present invention is applied to a caulking fixing portion of a square pipe production line. 1 and 2 are a front view and a longitudinal sectional view of a pressure roll used in a caulking device according to an embodiment of the present invention, and FIG. 3 is a sectional view showing a use state of the device.

The pressing roll 19 has a central roll-shaped press-contact peripheral surface 19a and large-diameter regulating surfaces 9b on both left and right sides thereof.
And is rotatably supported by the core 15 similarly to the conventional example (see FIG. 3).
A groove space 19c formed by the press contact peripheral surface 19a and the two regulating surfaces 19b has a volume necessary to receive the goby joint 4 and fix it by crimping. That is, the press contact peripheral surface 19a
Is in contact with the bottom surface of the goby joint 4, and the regulating surface 19 b is almost in contact with both side surfaces of the goby joint 4. The groove space 19c is made to correspond to the width and thickness of the goby joint formed by the thinnest metal plate in consideration of variations in the thickness of the metal plate.

A concave portion 20 having an arc-shaped cross section is formed at the edge of the press contact peripheral surface located at the boundary between the press contact peripheral surface 19a and the two regulating surfaces 19b. The recess 20 is formed in a ring shape so as to surround the periphery of the press contact peripheral surface, and serves as a relief portion when the goby joint 4 is rolled at the time of caulking. The depth and width of the recess 20 are appropriately set in consideration of the thickness, material, and the like of the metal plate forming the goby joint 4.

As shown in FIG. 3, the upper surface of the square pipe 1 is inserted between the upper forming roll 6 and the pressing roll 19 with the goby joint 4 being received in the groove space 19 c of the pressing roll 19. When receiving the pressing force of the pressure roll 19 and the upper forming roll 6, when the metal plate forming the square pipe 1 has the thinnest thickness, the regulating surface 19 b is connected to the goby joint 4 as in the related art. The crimping is performed by the press-contacting peripheral surface 19a and the upper forming roll 6 while restricting the rolling to the side.

When the thickness of the metal plate that can be received in the groove space 19c is larger than the set reference thickness (the thickness of the product with the smallest variation), both sides of the goby joint 4 are brought into contact with the press-contact peripheral surface 19a. Although a large acting force is exerted on the regulating surface 19b, the recess 20 is formed at the boundary between the press contact peripheral surface 19a and the regulating surface 19b.
Is formed, the rolled portion of the metal plate escapes into the recess 20 (see FIG. 4), so that all of the above-mentioned acting force is not imposed on the regulating surface 19b.

Therefore, even in the case of the goby joint 4 having a large thickness, accurate crimping can be performed by the single pressure roll 19 without damaging the pressure roll 19. The rolled portion that escapes to the escape portion 20 protrudes from both sides of the surface of the goby joint 4, but does not hinder the use of the square pipe 1 because the goby joint 4 is on the inner side of the pipe.

The pressure contact peripheral surface and the regulating surface do not necessarily have to be formed integrally, but may be constituted by combining separate members to form a pressure roll. Further, the device of the present invention can also be applied to caulking of metal plate gouge joints other than square pipes. In this case, the pressure roll is rotatably supported not by the core but by an appropriate support, and cooperates with the upper roll member to caulk the goby joint.

[0014]

According to the present invention, when caulking and fixing a goby joint using a pressure roll, the acting force exerted on the regulating surface due to a slight difference in plate thickness is released by rolling the rolled portion into the recess. As a result, even if the plate thickness is increased, it is possible to appropriately fix the crimping roll without breaking it. For this reason, it is not necessary to replace the pressure roll every time the sheet thickness is different, and it is possible to improve the working efficiency of the caulking fixation.

[Brief description of the drawings]

FIG. 1 is a front view of a pressure roll used in an apparatus according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the pressure bonding roll.

FIG. 3 is a sectional view showing a use state of the device.

FIG. 4 is an enlarged sectional view of a main part of FIG. 3;

FIG. 5 is an explanatory diagram of a square pipe production line in which the apparatus is used.

FIG. 6 is a perspective view showing a conventional caulking portion in the line of FIG.

FIG. 7 is a sectional view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Square pipe 2 Goose joint operation part 3 Caulking fixing part 4 Goe joint part 5, 15 core 6 Upper forming roll 7 Lower forming roll 9, 19 Crimping roll 19a Pressure contact peripheral surface 19b Regulation surface 19c Groove space 20 Concave portion

Claims (2)

[Claims] 1. A bent portion is formed along both sides of a metal plate along a longitudinal direction, and the bent portion is joined to each other to form a goby joint. A crimping device for crimping the goby joint by pressing the pressure contact roll with the pressure contact roll, wherein the pressure contact roll includes a roll-shaped pressure contact peripheral surface and large-diameter regulating surfaces on both sides of the pressure contact peripheral surface. And the groove space formed by the two regulating surfaces has a volume necessary to receive and fix the crimping joint, and a press contact peripheral surface edge located at a boundary between the press contact peripheral surface and the both control surfaces. A crimping device for a metal plate goby joint, wherein a recess for escape when the goby joint is rolled is formed on the metal plate. 2. The caulking device according to claim 1, wherein the escape recess is formed continuously in an annular shape at an edge of the press contact peripheral surface.