EP 1649945 A4 20070418 - DRILLING/ROLLING METHOD IN MANUFACTURING SEAMLESS TUBE
Title (en)
DRILLING/ROLLING METHOD IN MANUFACTURING SEAMLESS TUBE
Title (de)
BOHR-/WALZVERFAHREN BEI DER HERSTELLUNG VON NAHTLOSEN ROHREN
Title (fr)
PROCEDE DE PER AGE/LAMINAGE DESTINE A LA FABRICATION D'UN TUBE SANS SOUDURE
Publication
Application
Priority
- JP 2004007698 W 20040603
- JP 2003162416 A 20030606
Abstract (en)
[origin: EP1649945A1] A piercing method for manufacturing a seamless pipe capable of suppressing the rotary forging effects and suppressing the redundant shear strain without excessive narrowing of the roll diameter is provided. This method is characterized by holding a feed angle ² and a cross angle ³ of main rolls in a range satisfying the following expressions (1) to (3), setting the relationship between outer diameter "do" of the solid billet and the outer diameter "d" and thickness "t" of a hollow piece after piercing so as to satisfy the following expression (4), and further setting the relationship between inlet diameter D 1 and outlet diameter D 2 of the main roll with the above-mentioned "do", "d" and ³ so as to satisfy the following expression (5). 8 ° ‰¤ ² ‰¤ 20 ° 5 ° ‰¤ ³ ‰¤ 35 ° 15 ° ‰¤ ² + ³ ‰¤ 50 ° 1.5 ‰¤ ˆ’ ¨ r / ¨ ¸ ‰¤ 4.5 ( d / d 0 ) / ( 0.75 + 0.025 ³ ) ‰¤ D 2 / D 1 In the expression (4), ¨ r = ln ( 2 t / d 0 ) €‰ and €‰ ¨ ¸ = ln { 2 ( d ˆ’ t ) / d 0 }
IPC 8 full level
B21B 19/04 (2006.01)
CPC (source: EP)
B21B 19/04 (2013.01)
Citation (search report)
- [A] DE 3844802 C2 19950511 - SUMITOMO METAL IND [JP]
- [A] GB 2202778 A 19881005 - SUMITOMO METAL IND
- [A] JP S6431505 A 19890201 - SUMITOMO METAL IND
- [A] DE 3212742 A1 19821104 - SUMITOMO METAL IND [JP]
- [A] DE 2054541 A1 19710519
- See references of WO 2004108310A1
Designated contracting state (EPC)
DE IT
DOCDB simple family (publication)
EP 1649945 A1 20060426; EP 1649945 A4 20070418; EP 1649945 B1 20110126; CN 100509192 C 20090708; CN 1795060 A 20060628; DE 602004031232 D1 20110310; JP 4196991 B2 20081217; JP WO2004108310 A1 20060720; RU 2005141132 A 20060627; RU 2309810 C2 20071110; WO 2004108310 A1 20041216
DOCDB simple family (application)
EP 04745554 A 20040603; CN 200480014144 A 20040603; DE 602004031232 T 20040603; JP 2004007698 W 20040603; JP 2005506775 A 20040603; RU 2005141132 A 20040603