Global Patent Index - EP 2762247 A4

EP 2762247 A4 20150819 - FORGING METHOD FOR HIGH-EFFICIENCY CLOSING OF POROUS DEFECTS IN STEEL INGOTS OR BILLETS

Title (en)

FORGING METHOD FOR HIGH-EFFICIENCY CLOSING OF POROUS DEFECTS IN STEEL INGOTS OR BILLETS

Title (de)

SCHMIEDEVERFAHREN ZUM HOCHEFFIZIENTEN VERSCHLIESSEN PORÖSER DEFEKTE BEI STAHLBLÖCKEN ODER BARREN

Title (fr)

PROCÉDÉ DE FORGEAGE À HAUT RENDEMENT DE LA PARTIE INTERNE D'UN LINGOT D'ACIER OU D'UN FLAN PAR COALESCENCE À RETASSURES

Publication

EP 2762247 A4 20150819 (EN)

Application

EP 12833320 A 20120921

Priority

  • CN 201110282883 A 20110922
  • CN 201210225394 A 20120702
  • CN 2012081732 W 20120921

Abstract (en)

[origin: EP2762247A1] The present invention relates to the field of forging, and more particularly to a forging method which can heal the void in ingots or billets effectively. It can be used in open die forging process of ingots and billets of all shapes. Wide anvil radial forging method is used during forging, which uses two flat plates as upper and lower anvils. For ingots or billets with height-diameter ratio less than 2, the reduction ratio during wide anvil radial forging is 20% to 25%; for ingots or billets with height-diameter ratio larger than 2, the reduction ratio is 20% to 40%. This invention can heal the voids in the ingots or billets, especially the central porosities, which cannot be done by traditional forging methods. Moreover, this invention can also heal the voids in large height-diameter ratio ingots or billets using small reduction ratio.

IPC 8 full level

B21J 5/06 (2006.01)

CPC (source: EP)

B21J 1/02 (2013.01); B21J 5/022 (2013.01); C21D 7/13 (2013.01)

Citation (search report)

  • [XPA] CN 102500733 A 20120620 - INST METAL RES CHINESE ACAD SC
  • [AP] CN 102441631 A 20120509 - DONGBEI SPECIAL STEEL GROUP CO LTD
  • [A] JP 2007136487 A 20070607 - SUMITOMO METAL IND
  • [A] US 4404041 A 19830913 - AKAHORI KIMIHIKO [JP], et al
  • [A] US 5039355 A 19910813 - DAUMAS MARIE T [FR], et al
  • [A] JP 2004306135 A 20041104 - JFE STEEL KK
  • [XAI] LEE Y S ET AL: "Internal void closure during the forging of large cast ingots using a simulation approach", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, ELSEVIER, NL, vol. 211, no. 6, 22 January 2011 (2011-01-22), pages 1136 - 1145, XP028367906, ISSN: 0924-0136, [retrieved on 20110201], DOI: 10.1016/J.JMATPROTEC.2011.01.017
  • [A] ONO SHIN-ICHI; MINAMI KATSUYUKI; IWASAWA HIDEO; IWADATE TADAO; NAKATA SHIN-ICHI: "Void consolidation during open-die forging for ultralarge rotor shafts (2nd report, effectiveness of indenter flat-die cogging method)", TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS SERIES C, vol. 61, no. 588, 1 August 1995 (1995-08-01), pages 3437 - 3444, XP055199824, ISSN: 0387-5024
  • [A] KAKIMOTO H ET AL: "Development of forging process design to close internal voids", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, ELSEVIER, NL, vol. 210, no. 3, 1 February 2010 (2010-02-01), pages 415 - 422, XP026810752, ISSN: 0924-0136, [retrieved on 20091003]
  • [A] JIAN LAN ET AL: "A New Axial Upsetting Process for Large Ingots with Large Ratio of Height to Diameter", ADVANCED MATERIALS RESEARCH, vol. 189-193, 1 February 2011 (2011-02-01), pages 2684 - 2690, XP055199780, DOI: 10.4028/www.scientific.net/AMR.189-193.2684
  • See references of WO 2013041043A1

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 2762247 A1 20140806; EP 2762247 A4 20150819; WO 2013041043 A1 20130328

DOCDB simple family (application)

EP 12833320 A 20120921; CN 2012081732 W 20120921