Press molding and its high frequency quenching method and...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 9/00 (2006.01) B60R 19/04 (2006.01) B60R 19/18 (2006.01) B62D 21/15 (2006.01) B62D 25/04 (2006.01) B62D 25/08 (2006.01) B62D 25/20 (2006.01) C21D 1/10 (2006.01) C21D 1/42 (2006.01) C21D 1/74 (2006.01)

Patent

CA 2445930

A press formed article such as a center pillar or the like for a vehicle having a demanded strength distribution achieved by hardening through induction hardening or the like, and a method and an apparatus for performing induction hardening on the press formed article. The center pillar (10) being a press formed article has an intermediate top portion (11) which extends in a longitudinal direction of the center pillar (10), and two blade portions (12) which are both bent toward the same side from both sides of the intermediate top portion (11), in which hardening regions (Q) are provided on both sides of the intermediate top portion (11), extending over the intermediate top portion (11) and the blade portions (12). These hardening regions (Q) hardened by the induction hardening apparatus are regions in the form, widening toward the end, which continuously expands from the upper portion to the lower portion of the center pillar (10). Therefore, the ratio between the hardening regions and non-hardening regions changes in the longitudinal direction of the center pillar (10), resulting in a demanded strength distribution.

La présente invention concerne un moulage à la presse, par exemple un montant central de véhicule, possédant une distribution de résistance requise imprimée par trempe, par exemple par trempe par induction, un procédé de trempe par induction et un système de moulage à la presse. Un moulage à la presse, à savoir un montant central (10) comprend une partie supérieure intermédiaire (11) s'étendant longitudinalement et deux parties aile latérales (12) pliées du même côté à partir des côtés opposés de la partie supérieure intermédiaire (11). Une région de trempe (Q) est prévue sur les côtés opposés de la partie supérieure intermédiaire (11) qui s'étalent sur cette partie supérieure intermédiaire (11) et sur les parties aile latérales (12). Comme la région (Q) trempée par un système de trempe par induction s'élargit progressivement et continuellement de la partie supérieure à la partie inférieure du montant central (10), le rapport entre une région trempée et une région non trempée varie dans le sens longitudinal de ce montant central (10), assurant ainsi une répartition de résistance requise.

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