METHOD FOR MANUFACTURING AUTOMOBILE PART HAVING DIFFERENT LOCAL STRENGTHS USING HEAT-TREATMENT HARDENING STEEL PLATE

WIPO Patent Application WO/2012/060496

A1

The present invention relates to a method for manufacturing automobile parts having different local strengths, and more specifically, to a method for manufacturing automobile parts using a heat-treatment hardened steel having different local thicknesses. The present invention provides a method for manufacturing automobile parts comprising: a blank sheet preparation step for preparing blank sheets using a heat-treatment hardening steel plate having different thicknesses, and a heat-treatment hardening steel plate having different materials, according to the strength required; a blank conjugate forming step for forming a blank conjugate by connecting the blank sheets using laser welding; a cold molding step for cold press molding the blank conjugates; and a heat-treatment hardening step for heating the cold-molded part to above AC3 temperature, then resolving mold retention stress by quenching the part when constrained in a metal mold, and enhancing the strength thereby.

NAM SEUNG-MAN (KR)
CHAE SU-HONG (KR)
KWON MIN-SUCK (KR)
KIM HYO-SUB (KR)
IM HEE-JOONG (KR)
LEE BO-RYONG (KR)
MOON MAN-BEEN (KR)

PCT/KR2010/007829

May 10, 2012

November 08, 2010

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HYUNDAI HYSCO (KR)
NAM SEUNG-MAN (KR)
CHAE SU-HONG (KR)
KWON MIN-SUCK (KR)
KIM HYO-SUB (KR)
IM HEE-JOONG (KR)
LEE BO-RYONG (KR)
MOON MAN-BEEN (KR)

C21D8/02; B21D22/00; B23K26/20; C21D1/00

WO2006015849A2

2006-02-16

JP2004058082A	2004-02-26
JP2007154257A	2007-06-21
KR100902857B1	2009-06-16

See also references of EP 2636759A4
None

DAE-A INTERNATIONAL IP & LAW FIRM (KR)
특허법인 대아 (KR)

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