Global Patent Index - EP 2823905 B1

EP 2823905 B1 20170111 - WARM PRESS FORMING METHOD AND AUTOMOBILE FRAME COMPONENT

Title (en)

WARM PRESS FORMING METHOD AND AUTOMOBILE FRAME COMPONENT

Title (de)

HEISSPRESSFORMVERFAHREN UND KAROSSERIEKOMPONENTEN EINES KRAFTFAHRZEUGS

Title (fr)

PROCÉDÉ DE FORMAGE SOUS PRESSION À CHAUD ET COMPOSANT DE CHÂSSIS D'AUTOMOBILE

Publication

EP 2823905 B1 20170111 (EN)

Application

EP 13757922 A 20130304

Priority

  • JP 2012048725 A 20120306
  • JP 2013001316 W 20130304

Abstract (en)

[origin: EP2823905A1] Disclosed is a method for forming a steel sheet having a tensile strength of 440 MPa or more into a press-formed part including a flange portion and other portions by press forming, the method includes: heating the steel sheet to a temperature range of 400 °C to 700 °C; and then press-forming the heated steel sheet using draw forming to obtain a press-formed part, with the steel sheet being held at a press bottom dead point in the die for one second to five seconds. In this way, geometric changes such as springback that occur in a panel can be suppressed, the dimensional accuracy of the panel can be enhanced accordingly, and the desired mechanical properties can easily be obtained in the press-formed part.

IPC 8 full level

B21D 22/20 (2006.01); B21D 53/88 (2006.01); B21J 1/06 (2006.01); B21K 7/12 (2006.01); C21D 1/673 (2006.01); C21D 8/02 (2006.01); C21D 9/00 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/20 (2006.01); C22C 38/24 (2006.01); C22C 38/28 (2006.01); C22C 38/44 (2006.01); C22C 38/50 (2006.01); C22C 38/60 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01)

CPC (source: EP US)

B21D 22/02 (2013.01 - EP); B21D 22/208 (2013.01 - EP US); B21J 1/06 (2013.01 - US); B21K 7/12 (2013.01 - US); C21D 1/673 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/00 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/005 (2013.01 - EP US); C22C 38/007 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - EP US); C22C 38/105 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/20 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/60 (2013.01 - EP US); C23C 2/06 (2013.01 - EP US); C23C 2/28 (2013.01 - EP US); C23C 2/29 (2022.08 - EP US); B21D 53/88 (2013.01 - EP US); C21D 2211/004 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US)

Citation (opposition)

Opponent : ThyssenKrupp Steel Europe AG

  • JP 2011230189 A 20111117 - JFE STEEL CORP
  • JP 2006212663 A 20060817 - NIPPON STEEL CORP
  • US 2005257862 A1 20051124 - ASAI TATSUYA [JP], et al
  • JP 2010188393 A 20100902 - SUMITOMO METAL IND
  • JP 2003113442 A 20030418 - SUMITOMO METAL IND
  • MAKI ET AL.: "Resistance Heating Characteristics of High-Strength Steel Sheet Blank for Hot Press Forming", KEY ENGINEERING MATERIALS, 2007, pages 749 - 754, XP055431089
  • "Cold Rolled High Strength Steel Sheets with Improved Formability for Automobile Structural Uses", JIS G 3135, 11 July 1986 (1986-07-11), XP055431185
  • "Proceedings - IDDRG International Deep Drawing Research Group 2004 Conference, Forming the Future, Global Trends in Sheet Metal Forming", 2004, article SCHLIESSL ET AL.: "Manufacturing a roof frame from ultrahigh-strength steel materials by hot stamping&Manufacturing Methods for safety and structural body parts for lightweight body Design", pages: 158 - 173, XP055431201
  • LENZE ET AL.: "Herstellung von Karosseriebauteilen aus warmgeformten höchstfesten Stahlwerkstoffen", TAGUNGSBAND DES EFB-KOLLOQUIUMS, 2005, pages 53 - 61, XP009098694
  • YANAGIMOTO ET AL.: "Springback of High-Strength Steel after Hot and Warm Sheet Formings", CIRP ANNALS, vol. 54, no. 1, 2005, pages 213 - 216, XP029790509
  • MORI ET AL.: "Warm and Hot Stamping of Ultra High Tensile Strength Steel Sheets Using Resistance Heating", CIRP ANNALS, vol. 54, no. 1, 2005, pages 209 - 212, XP029790508
  • "The Conference Steels in Cars and Trucks", 2005, article "ThyssenKrupp Stahl - Semi-hot forming as an Advantage to Hot forming", pages: 564, XP055431217

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 2823905 A1 20150114; EP 2823905 A4 20150701; EP 2823905 B1 20170111; EP 2823905 B2 20200325; CN 104159681 A 20141119; CN 104159681 B 20160224; JP WO2013132821 A1 20150730; KR 101630557 B1 20160614; KR 20140122266 A 20141017; US 2015064052 A1 20150305; WO 2013132821 A1 20130912

DOCDB simple family (application)

EP 13757922 A 20130304; CN 201380012479 A 20130304; JP 2013001316 W 20130304; JP 2014503474 A 20130304; KR 20147024612 A 20130304; US 201314382995 A 20130304