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

EP 1109634 A1 20010627 (DE)

Application

EP 99936250 A 19990511

Priority

DE 9901459 W 19990511
DE 19840864 A 19980831

Abstract (en)

[origin: US6526792B1] The invention relates to a method for minimizing thickened ends during the rolling of tubes in a stretch-reducing mill by means of a change in time of the torque of individual driven roll stands when the tube front end and the tube rear end run through the stretch-reducing mill, so that the tube ends are rolled with higher roll speeds than the steady-state speeds. At the same time, lower roll speeds than the steady-state roll speeds are set between the steady-state and the increased roll speeds.

IPC 1-7

B21B 17/14; B21B 35/02; B21B 37/78

IPC 8 full level

B21B 17/14 (2006.01); B21B 37/18 (2006.01); B21B 37/78 (2006.01)

CPC (source: EP US)

B21B 37/78 (2013.01 - EP US); B21B 17/14 (2013.01 - EP US)

Citation (search report)

See references of WO 0012237A1

Designated contracting state (EPC)

AT ES FR GB IT

DOCDB simple family (publication)

US 6526792 B1 20030304; AT E228400 T1 20021215; AU 5147599 A 20000321; CN 1144630 C 20040407; CN 1315887 A 20011003; CZ 2001754 A3 20010912; CZ 300083 B6 20090128; DE 19840864 C1 19990729; 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; WO 0012237 A1 20000309

DOCDB simple family (application)

US 78603501 A 20010228; AT 99936250 T 19990511; AU 5147599 A 19990511; CN 99810433 A 19990511; CZ 2001754 A 19990511; DE 19840864 A 19980831; DE 9901459 W 19990511; EP 99936250 A 19990511; ES 99936250 T 19990511; JP 2000567324 A 19990511; RU 2001108551 A 19990511; UA 2001021380 A 19990511