Global Patent Index - EP 2782689 A1

EP 2782689 A1 20141001 - METHOD AND FORMING TOOL FOR HOT FORMING AND PRESS HARDENING WORK PIECES MADE OF SHEET STEEL, IN PARTICULAR GALVANIZED SHEET STEEL

Title (en)

METHOD AND FORMING TOOL FOR HOT FORMING AND PRESS HARDENING WORK PIECES MADE OF SHEET STEEL, IN PARTICULAR GALVANIZED SHEET STEEL

Title (de)

VERFAHREN UND UMFORMWERKZEUG ZUM WARMUMFORMEN UND PRESSHÄRTEN VON WERKSTÜCKEN AUS STAHLBLECH, INSBESONDERE VERZINKTEN WERKSTÜCKEN AUS STAHLBLECH

Title (fr)

PROCÉDÉ ET OUTIL DE FORMAGE À CHAUD ET DE TREMPE SOUS PRESSE DE PIÈCES EN TÔLE D'ACIER, EN PARTICULIER DE PIÈCES EN TÔLE D'ACIER GALVANISÉE

Publication

EP 2782689 A1 20141001 (DE)

Application

EP 12778287 A 20121016

Priority

  • DE 102011055643 A 20111123
  • EP 2012070445 W 20121016

Abstract (en)

[origin: CA2856679A1] The invention relates to a method for hot forming and press hardening plate-shaped or preformed workpieces made of sheet steel, in particular galvanized workpieces (1) made of sheet steel, in which the workpiece (1) is heated to a temperature exceeding the austenitizing temperature and subsequently formed and quenched in a cooled forming tool comprising a stamp (2) and a die (3), characterized in that the drawing edge region, which is defined by a positive die radius, of the die (3) used for hot forming and press hardening is provided with a materially bonded coating of a material (6, 6') and/or is provided with an insert (5) having a thermal conductivity that is lower than the thermal conductivity of section (3.1) of the die (3), which is adjacent to the drawing edge region, by at least 10 W/ (m * K), which section comes into contact with the workpiece (1) during hot forming and press hardening of the same. The surface of the material (6; 6') applied to the drawing edge region and facing the workpiece (1) or the surface of the provided insert (5) has a lateral dimension extending across the drawing edge (7), which is in the range of 1.6 times to 10 times the positive die radius of the die (3). The invention also relates to a corresponding forming tool.

IPC 8 full level

B21D 37/16 (2006.01); B21D 22/20 (2006.01); C21D 1/673 (2006.01)

CPC (source: EP RU US)

B21D 22/022 (2013.01 - US); B21D 22/20 (2013.01 - RU); B21D 22/208 (2013.01 - EP US); B21D 37/16 (2013.01 - EP RU US); C21D 1/673 (2013.01 - EP US); C21D 1/22 (2013.01 - EP US)

Citation (search report)

See references of WO 2013075888A1

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)

DE 102011055643 A1 20130523; CA 2856679 A1 20130530; CA 2856679 C 20191029; CN 103958087 A 20140730; CN 103958087 B 20160302; EP 2782689 A1 20141001; EP 2782689 B1 20160203; ES 2569351 T3 20160510; HU E027539 T2 20161128; JP 2014533608 A 20141215; JP 5886977 B2 20160316; KR 20140094021 A 20140729; MX 2014006178 A 20140619; MX 341647 B 20160826; PL 2782689 T3 20161230; RU 2014125268 A 20151227; RU 2606359 C2 20170110; US 2014311205 A1 20141023; US 9770750 B2 20170926; WO 2013075888 A1 20130530

DOCDB simple family (application)

DE 102011055643 A 20111123; CA 2856679 A 20121016; CN 201280056800 A 20121016; EP 12778287 A 20121016; EP 2012070445 W 20121016; ES 12778287 T 20121016; HU E12778287 A 20121016; JP 2014542744 A 20121016; KR 20147017102 A 20121016; MX 2014006178 A 20121016; PL 12778287 T 20121016; RU 2014125268 A 20121016; US 201214360079 A 20121016