EP 2979774 B1 20221116 - METHOD FOR MANUFACTURING ANNULAR FORMED BODY
Title (en)
METHOD FOR MANUFACTURING ANNULAR FORMED BODY
Title (de)
VERFAHREN ZUR HERSTELLUNG VON RINGFÖRMIG GEFORMTEN KÖRPER
Title (fr)
PROCÉDÉ DE FABRICATION D'UN CORPS MOULÉ EN FORME D'ANNEAU
Publication
Application
Priority
- JP 2013069205 A 20130328
- JP 2014059277 W 20140328
Abstract (en)
[origin: EP2979774A1] The present invention is directed to a method for manufacturing an annular formed body comprising a forging step of forging an alloy piece to provide a forged body having a disc shape, and a ring rolling step of ring-rolling an annular intermediate body prepared by forming a through-hole in the forged body to provide an annular formed body, characterized in that the forging step comprises at least two hot forging steps, each of the hot forging steps being carried out under the conditions that a strain rate is at most 0.5 s -1 , an absolute value µ¸1 of strain to the forged body in its circumferential direction is at least 0.3, an absolute value µh of strain to the forged body in its height direction is at least 0.3, and a ratio µh/µ¸1 between the absolute values of strain is within a range from 0.4 to 2.5.
IPC 8 full level
B21B 3/00 (2006.01); B21B 5/00 (2006.01); B21H 1/06 (2006.01); B21K 1/28 (2006.01); B21K 1/76 (2006.01); B21K 3/00 (2006.01); B21K 21/06 (2006.01); C21D 7/13 (2006.01); C21D 9/00 (2006.01); C22F 1/10 (2006.01)
CPC (source: EP RU)
B21B 5/00 (2013.01 - EP); B21H 1/06 (2013.01 - EP); B21K 1/28 (2013.01 - EP); B21K 1/761 (2013.01 - EP); B21K 3/00 (2013.01 - EP); B21K 21/06 (2013.01 - RU); C21D 7/13 (2013.01 - EP); C21D 9/0068 (2013.01 - EP); C22F 1/10 (2013.01 - EP); B21H 1/06 (2013.01 - RU)
Citation (examination)
EP 1847627 A2 20071024 - GEN ELECTRIC [US]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2979774 A1 20160203; EP 2979774 A4 20160928; EP 2979774 B1 20221116; CN 105228771 A 20160106; ES 2932530 T3 20230120; JP 2014188580 A 20141006; JP 6292761 B2 20180314; MX 2015013639 A 20160602; RU 2015146287 A 20170504; RU 2631221 C2 20170919; WO 2014157662 A1 20141002
DOCDB simple family (application)
EP 14775622 A 20140328; CN 201480028783 A 20140328; ES 14775622 T 20140328; JP 2013069205 A 20130328; JP 2014059277 W 20140328; MX 2015013639 A 20140328; RU 2015146287 A 20140328