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    • 8. 发明公开
    • METHOD FOR MANUFACTURING HOT PRESS MOLDED PRODUCT AND HOT PRESS MOLDED PRODUCT
    • 制造热压成型产品和热压成型产品的方法
    • EP3231525A1
    • 2017-10-18
    • EP15867156.0
    • 2015-09-08
    • JFE Steel CorporationTOYOTA JIDOSHA KABUSHIKI KAISHA
    • MORINO, MasakiKOBIKI, HideakiNAKAGAITO, TatsuyaTOKITA, YuichiMINOTE, ToruTAMAI, Yoshikiyo
    • B21D22/20C25D5/26
    • C21D9/50B21D22/022B21D22/20B21D22/203B21D22/208B21D37/16C21D1/673C21D8/0205C21D8/0278C22C18/00C23F17/00C25D3/22
    • A method for manufacturing a hot press formed part, includes: preparing a hot press forming object comprising a single-ply portion and a two-ply portion by welding first and second coated steel sheets together in partially overlapping relationship, each of the first and second coated steel sheets having a Zn-Ni coating layer formed on a surface thereof; heating the hot press forming object to a temperature range from an Ac 3 transformation temperature of a base steel sheet of the first coated steel sheet to 1000 °C; press forming the hot press forming object to obtain a formed body, the press forming being started upon temperatures of the single-ply portion and of the two-ply portion being no higher than solidification points of the Zn-Ni coating layers of the first and second coated steel sheets and no lower than an Ar 3 transformation temperature of the base steel sheet of the first coated steel sheet; and quenching the formed body, while squeezing the formed body by a tool of press forming and holding at its press bottom dead center, to thereby obtain a hot press formed part, in which the hot press forming object has a thickness ratio from 1.4 to 5.0.
    • 一种用于制造热压成型部件的方法,包括:通过将第一和第二涂层钢板以部分重叠的关系焊接在一起来制备包括单层部分和双层部分的热压成型体,第一和第二 在表面形成有Zn-Ni被覆层的被覆钢板; 将所述热压成形体加热至所述第一表面处理钢板的母材钢板的Ac 3相变点至1000℃的温度范围内; 压制成形热压成形体以获得成形体,压制成形在单层部分和双层部分的温度不高于第一和第二层的Zn-Ni涂层的凝固点时开始 第二表面处理钢板,并且不低于第一表面处理钢板的基底钢板的Ar3转变温度; 一边用冲压成形工具挤压成形体,一边在冲压下止点保持,从而得到热压成形体,该热压成形体的厚度比为1.4〜5.0 。