JP2017185528A - Steel pipe manufacturing equipment and steel pipe manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide steel pipe manufacturing equipment and a steel pipe manufacturing method for executing flexural molding of an edge part of a steel plate by preventing dislocation to the carrying direction of the edge part of the steel plate when molding by a cluster roll.SOLUTION: Steel pipe manufacturing equipment 10 molds a circular pipe-shaped steel pipe 11 by curvedly molding so as to oppose an edge part 12A on both sides in the width direction of a steel plate 12 by successively inserting the steel plate 12 into a breakdown roll 18A, a cluster roll 19A and a fin pass roll 20A, and comprises an edge bending device 30 for positioning the steel plate 12 by executing flexural molding of the edge part 12A of the steel plate 12 by sandwiching the edge part 12A of the steel plate 12 from the thickness direction of the steel plate 12 when molding by the cluster roll 19A.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steel pipe manufacturing facility and manufacturing method, and more particularly, to a facility and manufacturing method for manufacturing a large-diameter steel pipe by roll forming.

  Conventionally, in this type of steel pipe manufacturing equipment, the steel plate that is the raw material is continuously discharged and sequentially passed through the breakdown roll, cluster roll and fin pass roll so that the edge portions on both sides in the width direction of the steel plate face each other. A circular hollow steel pipe is manufactured by bending and welding the opposing edge portions.

  In this type of steel pipe manufacturing equipment, since a butt misalignment occurs when welding the edge part of the steel plate in the squeeze roll after passing the fin pass roll, the edge part of the steel pipe is placed upstream of the breakdown roll. An edge bending device for bending is provided.

  However, in this type of steel pipe manufacturing equipment, first, since the edge portion of the steel pipe is bent and then bent, the shape of the existing stand and various rolls, etc. are adjusted according to the height or shape of the edge portion. Need to be changed.

  Therefore, in the steel pipe manufacturing facility shown in Patent Document 1, an edge bending device is provided between the breakdown roll and the cluster roll, and the edge bending is performed before the steel plate that has passed through the breakdown roll is introduced into the cluster roll. An apparatus for bending the edge portion using an apparatus has been developed.

JP-A-6-126337

  However, in the steel pipe manufacturing facility shown in Patent Document 1, when the steel plate is introduced into the cluster roll, the edge portion of the steel plate may be shifted in the left-right direction with respect to the conveying direction, and particularly a large-diameter steel pipe is manufactured. When doing so, the deviation is likely to occur. Therefore, when the steel plate in a state shifted in the left-right direction is introduced into an edge bending apparatus that simply bends the edge portion of the steel plate as shown in Patent Document 1, the edge portion of the steel plate remains in a state shifted in the left-right direction. When the edge portion of the steel sheet is welded, a butt misalignment still occurs, resulting in poor welding.

  Therefore, an object of the present invention is to provide a steel pipe manufacturing facility and a steel pipe manufacturing method for performing bending forming of an edge portion of a steel sheet while preventing deviation of the edge portion of the steel sheet with respect to the conveying direction during forming by a cluster roll. .

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, the steel pipe manufacturing facility according to the present invention is a tubular steel pipe in which a steel plate is sequentially passed through a breakdown roll, a cluster roll, and a fin pass roll, and is bent so that the edges on both sides in the width direction of the steel plate face each other. A steel pipe manufacturing facility for forming the steel sheet, and during the forming by the cluster roll, the edge portion of the steel plate is sandwiched from the thickness direction of the steel plate to bend the edge portion of the steel plate, and the steel plate is positioned. An edge bending device for performing the above is provided.
In the above configuration, the edge of the steel plate is bent while the steel plate is positioned.

Moreover, the steel pipe manufacturing equipment of the present invention is the above steel pipe manufacturing equipment, wherein the edge bending device includes an upper abutting roll that abuts on an edge portion of the steel plate from above in the thickness direction of the steel plate, and a thickness direction of the steel plate. A lower abutting roll that abuts against the edge portion of the steel plate from below, and the upper abutting roll and the lower abutting roll sandwich the edge portion of the steel plate from the thickness direction of the steel plate. Thus, the edge portion of the steel sheet is bent and the steel sheet is positioned by the upper contact roll or the lower contact roll.
In the said structure, the edge part of a steel plate is bend-formed in the state which positioned the steel plate with the upper contact roll and the lower contact roll.

In the steel pipe manufacturing method of the present invention, a steel plate is passed through a breakdown roll, a cluster roll, and a fin pass roll in order, and is bent so that the edge portions on both sides in the width direction of the steel plate face each other. And forming the edge of the steel sheet by bending the edge of the steel sheet from the thickness direction of the steel sheet during forming by the cluster roll, and positioning the steel sheet It is a method to do.
In the above method, the edge of the steel sheet is bent while the steel sheet is positioned.

  According to the steel pipe manufacturing equipment and the steel pipe manufacturing method of the present invention, the edge portion of the steel plate is bent while the steel plate is positioned. Deviation can be prevented and bending of the edge portion of the steel sheet can be performed. Therefore, when welding the edge part of a steel plate, a butt | matching difference does not generate | occur | produce and a quality steel pipe can be manufactured.

It is a perspective view which shows the steel pipe manufacturing equipment which concerns on embodiment of this invention. It is a front view which shows the cluster apparatus and edge bending apparatus in the steel pipe manufacturing equipment which concerns on embodiment of this invention. It is AA sectional drawing of FIG.

  Hereinafter, steel pipe manufacturing equipment 10 concerning an embodiment of the invention is explained based on a drawing.

  As shown in FIG. 1, the steel pipe manufacturing facility 10 is curved and formed so that the edge portions 12A (FIG. 2) on both sides in the width direction of the steel plate 12 (direction perpendicular to the conveyance direction of the steel plate 12) are opposite to each other. And it is equipment which shape | molds the tubular steel pipe 11 by butting | matching and welding edge part 12A of both sides.

  In the steel pipe manufacturing facility 10, when manufacturing a circular steel pipe 11, a steel plate 12 having a predetermined thickness and length corresponding to the steel pipe 11 is prepared in a coil (roll) shape. The steel plate 12 is rewound by a rewinding device 13 composed of a pinch roller or the like, and then flattened by a leveling device 14. Then, only the unwinding tip portion of the steel plate 12 is cut and removed by the cutting device 15.

  The steel plate 12 that has been rewound and continuously moved has its edge portions 12A cut and removed by the trimming device 16. Next, the steel plate 12 is formed in a gentle R shape by the preform device 17 so that the edge portions 12A on both sides in the width direction face each other, and then gradually by the breakdown device 18 including a plurality of breakdown rolls 18A. It is curved and formed into an arc shape.

  The steel plate 12 which is curved and formed into an arc shape is formed by bending a pair of vertical plate portions on the inside thereof in a cluster device 19 composed of a plurality of cluster rolls 19A. And it is shape | molded gradually by the fin pass apparatus 20 which consists of several fin pass roll 20A, and the tubular steel pipe 11 with which the edge parts 12A of the both sides of the width direction contact | abutted is press-molded. The tubular steel pipe 11 enters the high-frequency resistance welder 21 and, after the fusion method welding by heating is performed, the outer surface beat is cut by the cutting device 22 to produce the tubular steel pipe 11 having the seam welded portion. .

  In the steel pipe manufacturing facility 10, when the entire steel plate 12 is bent by the cluster device 19, the edge portions 12A on both sides in the width direction of the steel plate 12 are bent. As shown in FIG. 2, the cluster device 19 is provided with an edge bending device 30 for bending the edge portion 12 </ b> A of the steel plate 12. The edge bending device 30 is provided on an upper portion of a stand 19B on which the cluster roll 19A is rotatably supported. The edge bending device 30 holds the edge portion 12A of the steel plate 12 conveyed by the conveying roll 19C from above and below, and performs bending of the edge portion 12A.

  The edge bending apparatus 30 includes an upper contact roll 31 that contacts the edge portion 12A of the steel plate 12 from above with respect to the thickness direction of the steel plate 12, and an edge portion 12A of the steel plate 12 from below with respect to the thickness direction of the steel plate 12. And a lower abutting roll 35 that abuts on the main body.

  The upper abutting roll 31 is disposed on the outer peripheral side of the steel plate 12 that is curved and formed into a circular tube shape, and is supported rotatably by the stand 19B. The upper abutting roll 31 abuts on the upper surface of the edge portion 12A of the steel plate 12 (the outer peripheral surface of the steel plate 12 curved in a tubular shape). The upper contact rolls 31 are provided corresponding to the respective edge portions 12A on both sides in the width direction of the steel plate 12, and are arranged so that the pair of upper contact rolls 31 face each other. The upper contact roll 31 mainly includes an upper roll body 32 that comes into contact with the edge portion 12A of the steel plate 12 from above, and an upper roll shaft 33 that is supported by the stand 19B and rotatably supports the upper roll body 32. Composed.

  The upper roll body 32 is formed such that the shaft diameter from one end to the other end gradually increases in accordance with the degree of curvature of the edge portion 12A of the steel plate 12. The upper roll main body 32 bends the edge portion 12A by pressing the edge portion 12A from above the steel plate 12. A positioning portion 34 for positioning the steel plate 12 is formed at one end of the upper roll main body 32 (the end portion on the side having a small shaft diameter).

  The positioning portion 34 is formed in an annular shape at one end of the upper roll body 32 (end portion on the side having a smaller shaft diameter) larger than the diameter of one end (end portion on the side having a smaller shaft diameter) of the upper roll body 32. The positioning portion 34 is in contact with the tip of the edge portion 12A of the edge portion 12A of the steel plate 12 (the end surface in the width direction of the steel plate 12), whereby the positioning portion 34 is in the left-right direction of the steel plate 12 (relative to the conveying direction of the steel plate 12). Position in the direction orthogonal to the horizontal).

  As shown in FIG. 2, the lower contact roll 35 is disposed on the inner peripheral side of the steel plate 12 that is formed into a tubular shape so as to face the upper contact roll 31 with the steel plate 12 interposed therebetween. A support member 19D extending downward is rotatably supported. The lower contact roll 35 is in contact with the lower surface of the edge portion 12A of the steel plate 12 (the inner peripheral surface of the steel plate 12 curved in a tubular shape). The lower contact rolls 35 are provided corresponding to the respective edge portions 12A on both sides in the width direction of the steel plate 12, and are arranged so that the pair of lower contact rolls 35 face each other. The lower contact roll 35 includes a lower roll body 36 that contacts the edge portion 12A of the steel plate 12 from below, and a lower roll shaft 37 that is supported by the support member 19D and rotatably supports the lower roll body 36. Is done.

  The lower roll body 36 is configured such that the shaft diameter from one end to the other end gradually increases in accordance with the degree of curvature of the edge portion 12A of the steel plate 12. The lower roll body 36 supports the edge portion 12A of the steel plate 12 pressed from above by the upper roll body 32 from below. That is, by sandwiching the edge portion 12A of the steel plate 12 by the upper roll body 32 and the lower roll body 36, the edge portion 12A of the steel plate 12 is bent and the vertical positioning of the steel plate 12 is performed. . Thus, the lower contact roll 35 (lower roll body 36) is disposed on the inner peripheral side of the steel plate 12 that is curved and formed into a tubular shape, so that the upper contact roll 31 (upper roll body 32) is positioned above. It can prevent that the steel plate 12 is bent too much by the press from.

  As shown in FIG.2 and FIG.3, the upper contact roll 31 and the lower contact roll 35 are arrange | positioned along the conveyance direction of the steel plate 12 according to the position where 19A of cluster rolls are arrange | positioned. Further, the distance K between the upper contact rolls 31 facing each other and the distance K between the lower contact rolls 35 facing each other are the tip of the edge portion 12A of the steel plate 12 which is curved and formed into a circular tube shape (the width direction of the steel plate 12). Is set in accordance with the interval of the end face of. Specifically, the distance K between the upper contact rolls 31 and the distance K between the lower contact rolls 35 are more than the upper contact roll 31 and the lower contact roll 35 arranged on the upstream side in the conveying direction of the steel plate 12. The upper contact roll 31 and the lower contact roll 35 disposed on the downstream side in the conveying direction of the steel plate 12 are narrower. Further, the interval K is set so as to be gradually narrowed with the upper contact roll 31 and the lower contact roll 35 disposed on the downstream side in the conveying direction of the steel plate 12.

  As described above, according to the above configuration, since the edge portion 12A of the steel plate 12 is bent while the steel plate 12 is positioned, the edge portion 12A of the steel plate 12 is formed during the forming by the cluster roll 19A. The edge portion 12A of the steel plate 12 can be bent while preventing the deviation in the conveying direction. Therefore, when welding the edge portion 12 </ b> A of the steel plate 12, a butt misalignment does not occur, and a high quality steel pipe 11 can be manufactured.

DESCRIPTION OF SYMBOLS 10 Steel pipe manufacturing equipment 11 Steel pipe 12 Steel plate 12A Edge part 18A Breakdown roll 19A Cluster roll 20A Fin pass roll 30 Edge bending apparatus 31 Upper contact roll 35 Lower contact roll

Claims (3)

A steel pipe manufacturing facility for forming a circular steel pipe by sequentially bending the steel sheet through a breakdown roll, a cluster roll and a fin pass roll, and forming a circular steel pipe by bending the edges on both sides in the width direction of the steel sheet.
An edge bending device is provided that positions the steel sheet while bending the edge part of the steel sheet while holding the edge part of the steel sheet from the thickness direction of the steel sheet during forming by the cluster roll. Steel pipe manufacturing equipment. The edge bending apparatus is
An upper abutting roll that abuts against an edge portion of the steel plate from above in the thickness direction of the steel plate;
A lower abutting roll that abuts against an edge portion of the steel sheet from below in the thickness direction of the steel sheet;
With
The upper abutment roll and the lower abutment roll bend the edge portion of the steel sheet by sandwiching the edge portion of the steel sheet from the thickness direction of the steel plate, and the upper abutment roll The steel pipe manufacturing facility according to claim 1, wherein the steel sheet is positioned by a lower abutting roll. A steel pipe manufacturing method in which a steel sheet is sequentially passed through a breakdown roll, a cluster roll, and a fin pass roll, and a circular steel pipe is formed by bending so that the edge portions on both sides in the width direction of the steel sheet face each other.
A steel pipe manufacturing method characterized in that, during forming by a cluster roll, the edge portion of the steel plate is sandwiched from the thickness direction of the steel plate to bend the edge portion of the steel plate, and the steel plate is positioned. .

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