EP 2085158 A4 20120801 - MANDREL MILL, ITS OPERATING METHOD, AND SEAMLESS PIPE MANUFACTURING METHOD
Title (en)
MANDREL MILL, ITS OPERATING METHOD, AND SEAMLESS PIPE MANUFACTURING METHOD
Title (de)
ROHRWALZWERK MIT DORN, BETRIEBSVERFAHREN DAFÜR RUND VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN ROHRS
Title (fr)
LAMINOIR CONTINU, SON PROCÉDÉ DE FONCTIONNEMENT ET PROCÉDÉ DE FABRICATION DE TUYAU SANS COUTURES
Publication
Application
Priority
- JP 2007070732 W 20071024
- JP 2006303776 A 20061109
Abstract (en)
[origin: EP2085158A1] The object of the present invention is to provide a mandrel mill capable of producing a seamless pipe without flaws such as necking. The mandrel mill of the present invention includes a plurality of consecutively provided grooved-roll stands and a mandrel bar 3 provided in a roll groove array formed by the grooved-roll stands so as to continuously elongate a hollow shell 2. Roll grooves 4 of at least a first stand and a second stand are arranged so as to satisfy conditions represented by the following formulas (1) to (4): b ‰¤ 10 ¢ a + 1.5 b ‰¤ - a + 1.5 b ‰¥ 10 ¢ a - 0.2 b ‰¥ - a + 1.15 wherein a = S/R1, b = C/(R1-S).
IPC 8 full level
B21B 17/02 (2006.01); B21B 27/02 (2006.01)
CPC (source: EP US)
B21B 17/04 (2013.01 - EP US); B21B 27/035 (2013.01 - EP US); B21B 2267/02 (2013.01 - EP US); B21B 2267/06 (2013.01 - EP US)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 2008056540A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2085158 A1 20090805; EP 2085158 A4 20120801; BR PI0718203 A2 20150922; CN 101534969 A 20090916; JP 2008119706 A 20080529; US 2010064753 A1 20100318; US 2010132425 A1 20100603; WO 2008056540 A1 20080515
DOCDB simple family (application)
EP 07830466 A 20071024; BR PI0718203 A 20071024; CN 200780041390 A 20071024; JP 2006303776 A 20061109; JP 2007070732 W 20071024; US 31242307 A 20071024; US 56322909 A 20090921