Roller bending apparatus and method of bending a steel plate using the same

A steel plate and roll bending technology, which is applied in the roll bending device of steel plate and the roll forming field of steel plate using the roll bending device, which can solve the problems of large-scale equipment

Inactive Publication Date: 2011-10-19
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, even with rolls for pre-bending, some degree of deformation cannot be avoided at all costs at the beginning of bending
In addition, it is necessary to install a bench for pre-bending before the billet opening process, and there is a problem of increasing the size of the equipment

Method used

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  • Roller bending apparatus and method of bending a steel plate using the same
  • Roller bending apparatus and method of bending a steel plate using the same
  • Roller bending apparatus and method of bending a steel plate using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0089] Hereinafter, the present invention will be described using specific examples.

[0090] The end portion of a steel plate with a thickness of 10 mm and a strength of 590 MPa was roll formed using a single stand, and end deformation during forming was compared between the case of using the roll of the present invention and the case of using a conventional roll.

[0091] Figure 14 It is a general view of the roll shape of the present invention, and the contact portion of the lower roll with the end of the steel plate has a curvature radius R of 30 mm and a roll angle θ of 35° in a direction opposite to the bending direction of the steel plate, forming a convex Shaped curvature part, other parts are linear. A convex curvature portion having a radius of curvature Ru of 50 mm and a roll angle θu of 35° was formed on the portion of the top roll where the steel sheet was bent.

[0092] Figure 15 It is a schematic diagram showing the roll shape of a conventional method used ...

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Abstract

To prevent a side end (4) of a steel plate (3) from being reduced during a press rolling by a roller bending apparatus including an upper roller (1) and a bottom roller (2), the bottom roller (2), which presses against the outer side of the side end, is provided with a convexly curved portion (5).

Description

technical field [0001] The present invention relates to a roll bending device for a steel plate and a roll bending method for a steel plate using the roll bending device, and more particularly to a roll bending device for a steel plate suitable for producing thick-walled tubes such as cylinder tubes and a roll for a steel plate using the roll bending device Bending method. Background technique [0002] As a method of manufacturing a steel pipe, a method is widely used in which a steel plate is gradually bent and formed into a circular shape by multistage forming rolls, and then the end faces are welded together. [0003] This bending process is roughly divided into a break down process in the first half and a fin pass process in the second half, and a large bending process is performed in the break down process. [0004] The roll bending of the steel sheet is performed by pressing the steel sheet between an upper roll and a lower roll. The steel plate is fed over the lower...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B21D5/12
CPCB21D5/08B21D5/12
Inventor井口敬之助中村英幸
OwnerNIPPON STEEL CORP