BUMPER LOWER STIFFENER WITH IMPROVED PERFORMANCE USING ULTRA HIGH STRENGTH STEEL PIPE AND MANUFACTURING METHOD THEREOF

WIPO Patent Application WO/2011/102601

A2

The present invention relates to a bumper lower stiffener formed at the lower portion of the front bumper of a vehicle and a manufacturing method thereof. More specifically, the present invention relates to a bumper lower stiffener manufactured using a steel pipe formed by hot pressing and a manufacturing method thereof. The present invention provides a method for manufacturing the horizontal member of the bumper lower stiffener, which includes a cutting step of cutting a steel pipe added with quenching elements at a predetermined length; a heat treatment step of heating the cut steel pipe at a molding temperature; a hot pressing step of hot-pressing the heated steel pipe with press molds into the shape of the horizontal member having plane surface sections at the both sides thereof; and a cooling step of rapidly cooling the formed horizontal member in the state that the press molds are closed.

KIM HYO-SUB (KR)
SUNG KYUNG-JIN (KR)
KIM KWANG-SOON (KR)
KIM YUN-GYU (KR)

PCT/KR2011/000058

August 25, 2011

January 06, 2011

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HYUNDAI HYSCO (KR)
KIM HYO-SUB (KR)
SUNG KYUNG-JIN (KR)
KIM KWANG-SOON (KR)
KIM YUN-GYU (KR)

B60R19/24; B60R19/18

JP2008132935A	2008-06-12
KR100767303B1	2007-10-17
JP2010023792A	2010-02-04
KR20040057777A	2004-07-02

None
See also references of EP 2540576A4

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

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