EP 3006133 B1 20170816 - METHOD FOR PRODUCING STEEL PIPE
Title (en)
METHOD FOR PRODUCING STEEL PIPE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES STAHLROHRS
Title (fr)
PROCÉDÉ DE FABRICATION D'UN TUBE D'ACIER
Publication
Application
Priority
JP 2013064525 W 20130524
Abstract (en)
[origin: EP3006133A1] A method for manufacturing a steel pipe includes forming a steel plate into a cylindrical shape by a bending press method that presses down the steel plate with a punch having, at a leading edge thereof, an outer circumferential surface with a circular arcuate section so that edges in a width direction of the steel plate face each other; butting and welding together the edges in the width direction of the steel plate; and expanding the steel pipe from the inside using a pipe expanding machine in which a plurality of pipe expanding dies having an outer circumferential surface with a circular arcuate section are circumferentially arranged, wherein a pipe expanding R ratio that is a ratio of a curvature radius of the outer circumferential surface of each of the pipe expanding dies to a target radius of an inner surface of the steel pipe and a punch R ratio that is a ratio of a curvature radius of an outer circumferential surface of a leading end of the punch to the target radius of the inner surface of the steel pipe are both less than 1, and the pipe expanding R ratio and the punch R ratio satisfy a predetermined conditional expression. As a result, a steel pipe with high roundness can be manufactured without cracking a pipe expanding die.
IPC 8 full level
B21D 39/20 (2006.01); B21C 37/08 (2006.01); B21D 3/14 (2006.01); B21D 5/01 (2006.01)
CPC (source: EP RU)
B21C 37/0815 (2013.01 - EP); B21D 3/14 (2013.01 - EP); B21D 5/015 (2013.01 - EP); B21D 5/01 (2013.01 - RU); B21D 39/20 (2013.01 - EP RU)
Citation (examination)
JP 2012170977 A 20120910 - JFE STEEL CORP
Citation (opposition)
Opponent : SMS group GmbH
- JP 2012170977 A 20120910 - JFE STEEL CORP
- JP S59183943 A 19841019 - SUMITOMO METAL IND
- JP 2001113316 A 20010424 - KAWASAKI STEEL CO, et al
- M.D. HERYNK, S. KYRIAKIDES, A. ONOUFRIOU, H.D. YUN: "Effects of the UOE/UOC pipe manufacturing processes on pipe collapse pressure", INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, vol. 49, no. 5, 1 May 2007 (2007-05-01), pages 533 - 553, XP055496653
- JAI DEV CHANDEL, NAND LAL SINGH: "Formation of X-120 M Line Pipe through J-C-O-E Technique", ENGINEERING, vol. 3, 1 January 2011 (2011-01-01), pages 400 - 410, XP055496657
- GERHARD OEHLER: "Schnitt-, Stanz- und Ziehwerkzeuge", 1973, SPRINGER VERLAG, pages: 1pp, 222 - 224, XP055496660
- KURT LANGE: "Handbook of metal forming", 1985, MCGRAW-HILL, INC.,, pages: 1pp, v, 19.8 - 19.9, XP055496663
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3006133 A1 20160413; EP 3006133 A4 20160629; EP 3006133 B1 20170816; CN 105246613 A 20160113; CN 105246613 B 20170308; JP 5541432 B1 20140709; JP WO2014188599 A1 20170223; RU 2617465 C1 20170425; WO 2014188599 A1 20141127
DOCDB simple family (application)
EP 13885377 A 20130524; CN 201380076836 A 20130524; JP 2013064525 W 20130524; JP 2014504870 A 20130524; RU 2015155583 A 20130524