EP 1109634 A1 20010627 - METHOD FOR MINIMIZING THICKENED ENDS DURING THE ROLLING OF PIPES IN A STRETCH REDUCING MILL
Title (en)
METHOD FOR MINIMIZING THICKENED ENDS DURING THE ROLLING OF PIPES IN A STRETCH REDUCING MILL
Title (de)
VERFAHREN ZUR MINIMIERUNG VERDICKTER ENDEN BEIM WALZEN VON ROHREN IN EINEM STRECKREDUZIERWALZWERK
Title (fr)
PROCEDE DE REDUCTION DES EXTREMITES EPAISSIES LORS DU LAMINAGE DE TUYAUX DANS UN LAMINOIR ETIREUR-REDUCTEUR
Publication
Application
Priority
- DE 9901459 W 19990511
- DE 19840864 A 19980831
Abstract (en)
[origin: DE19840864C1] The invention relates to a method for minimizing thickened ends during the rolling of pipes in a stretch reducing mill. To this end the torque of individually driven mill stands is temporarily modified when the front and back ends of the pipes pass through the stretch reducing mill so that said pipe ends are rolled at roll speed ratios which are greater than the steady-state roll speed ratios. Between the steady-state and the increased speed ratios smaller than steady-state speed ratios are set.
IPC 1-7
IPC 8 full level
B21B 37/18 (2006.01); B21B 37/78 (2006.01); B21B 17/14 (2006.01)
CPC (source: EP US)
B21B 37/78 (2013.01 - EP US); B21B 17/14 (2013.01 - EP US)
Designated contracting state (EPC)
AT ES FR GB IT
DOCDB simple family (publication)
DE 19840864 C1 19990729; AT 228400 T 20021215; AU 5147599 A 20000321; CN 1144630 C 20040407; CN 1315887 A 20011003; CZ 2001754 A3 20010912; CZ 300083 B6 20090128; EP 1109634 A1 20010627; EP 1109634 B1 20021127; ES 2183589 T3 20030316; JP 2002523243 A 20020730; JP 3794923 B2 20060712; RU 2224607 C2 20040227; UA 67792 C2 20040715; US 6526792 B1 20030304; WO 0012237 A1 20000309
DOCDB simple family (application)
DE 19840864 A 19980831; AT 99936250 T 19990511; AU 5147599 A 19990511; CN 99810433 A 19990511; CZ 2001754 A 19990511; DE 9901459 W 19990511; EP 99936250 A 19990511; ES 99936250 T 19990511; JP 2000567324 A 19990511; RU 2001108551 A 19990511; UA 2001021380 A 19990511; US 78603501 A 20010228