Title:
HOT PRESS MOLDING METHOD ENABLING HARDNESS ADJUSTMENT
Document Type and Number:
WIPO Patent Application WO/2011/132501
Kind Code:
A1
Abstract:
In the disclosed method, a quenchable steel sheet is press molded by a mold. The method comprises: heating the aforementioned steel sheet to at least the Ac3 point of the aforementioned steel sheet; performing a first pressing of the aforementioned heated steel sheet in order to impart a localized strain at a limited site; retaining a state wherein the aforementioned steel sheet is separated from the aforementioned mold immediately after the aforementioned first pressing; and performing another pressing of the aforementioned steel sheet—that had been retained in the aforementioned state—maintaining a state of close contact between the aforementioned steel sheet and the aforementioned mold.
Inventors:
KOBAYASHI, Masanori (Sagamihara Plant 2-25, Minami Hashimoto 3-chome, Chuo-ku, Sagamihara-sh, Kanagawa 53, 〒2520253, JP)
Application Number:
JP2011/057591
Publication Date:
October 27, 2011
Filing Date:
March 28, 2011
Export Citation:
Assignee:
TOPRE CORPORATION (12-2, Nihonbashi 3-chome Chuo-k, Tokyo 27, 〒1030027, JP)
東プレ株式会社 (〒27 東京都中央区日本橋３丁目１２番２号 Tokyo, 〒1030027, JP)
東プレ株式会社 (〒27 東京都中央区日本橋３丁目１２番２号 Tokyo, 〒1030027, JP)
International Classes:
B21D22/20; C21D1/18; C22C38/18; C22C38/00
Attorney, Agent or Firm:
MIYOSHI, Hidekazu et al. (Toranomon Kotohira Tower, 2-8 Toranomon 1-chome, Minato-k, Tokyo 01, 〒1050001, JP)
Claims: