Title:
METHOD OF PRODUCING DIFFERENT THICKNESS STEEL PLATE AND DEVICE FOR FORMING DIFFERENT THICKNESS
Document Type and Number:
Japanese Patent JP2014131812
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method of producing a different thickness steel plate without using welding and performing complicated roll gap control.SOLUTION: The method of producing a different thickness steel plate comprises: a roll forming step of gradually performing bend-forming on a steel strip with rolls for forming arranged in many steps while sending the steel strip continually, thereby forming a nearly circular cross-section material having a nearly circular cross-section; a step of conveying the nearly circular cross-section material to a device for forming different thickness composed of a fixed die and a mandrel having a diameter different in a longitudinal direction without welding the end of the nearly circular cross-section material; a step of forming different thickness in the longitudinal direction of the nearly circular cross-section material by removing and inserting the mandrel inside the fixed die; and an unbending-forming step of relieving the bending added to the material in the roll forming step, in order to relieve the bending of the nearly circular cross-section material to thereby form a steel strip.
Inventors:
SATO KOICHI
Application Number:
JP2013000545A
Publication Date:
July 17, 2014
Filing Date:
January 07, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
B21C37/02; B21C1/34; B21C37/16; B21H8/00
Domestic Patent References:
| JPS5794429A | 1982-06-11 | |||
| JP2011045924A | 2011-03-10 | |||
| JP2008520440A | 2008-06-19 | |||
| JPS63130215A | 1988-06-02 |
Attorney, Agent or Firm:
Fumio Yamamoto
Tatsuo Watanuki
Yukine Sekine
Tatsuo Watanuki
Yukine Sekine
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