EP 2133159 B1 20130123 - METHOD OF MANUFACTURING A SEAMLESS PIPE OR TUBE
Title (en)
METHOD OF MANUFACTURING A SEAMLESS PIPE OR TUBE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES NAHTFREIEN ROHRES
Title (fr)
PROCÉDÉ DE FABRICATION DE TUYAUX SANS SOUDURE
Publication
Application
Priority
- JP 2008055645 W 20080326
- JP 2007092996 A 20070330
Abstract (en)
[origin: EP2133159A1] There is provided a method for manufacturing a seamless pipe or tube that is capable of making more uniform the wall thickness distribution of a pipe or tube along the longitudinal direction of the pipe or tube than the prior art. The method for manufacturing a seamless pipe or tube according to the present invention comprises a first step of measuring the outside diameter distribution of thg mandrel bar B along the longitudinal direction of the mandrel bar at normal temperature; a second step of measuring the temperature distribution of the mandrel bar along the longitudinal direction of the mandrel bar in the mandrel bar after it being used for a drawing and rolling step in a mandrel mill M; and a third step of measuring the wall thickness distribution of the pipe or tube in the hot state after it being subjected to drawing and rolling with the mandrel bar being inserted thereinto, along the longitudinal direction of the pipe or tube. And the method comprises a fourth step of calculating the outside diameter distribution of the mandrel bar along the longitudinal direction of the mandrel bar at the time of being used for drawing and rolling on the basis of the respective parameters which have been obtained at the first to third steps, and a fifth step of adjusting the setting position of the grooved roll R in the rolling direction on the basis of the outside diameter distribution of the mandrel bar along the longitudinal direction of the mandrel bar when the mandrel bar is inserted into the inside of a pipr or tube at the next timing for being used for drawing and rolling.
IPC 8 full level
B21B 37/78 (2006.01); B21B 17/02 (2006.01)
CPC (source: EP)
B21B 37/78 (2013.01); B21B 17/04 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2133159 A1 20091216; EP 2133159 A4 20111026; EP 2133159 B1 20130123; CN 101711190 A 20100519; CN 101711190 B 20111012; JP 5041304 B2 20121003; JP WO2008123276 A1 20100715; WO 2008123276 A1 20081016
DOCDB simple family (application)
EP 08738871 A 20080326; CN 200880018286 A 20080326; JP 2008055645 W 20080326; JP 2009509125 A 20080326