公开(公告)号：US20210340643A1

公开(公告)日：2021-11-04

申请号：US17378898

申请日：2021-07-19

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： Eiichi OTA ,  Yasuhiro Yogo ,  Tomoaki Ihara

IPC分类号： C21D9/48 ,  C21D1/22 ,  B21D22/20 ,  B21D22/02 ,  C21D1/673

摘要： A hot-press molding method of the present disclosure includes a first heating process in which a steel plate is heated and the entire steel plate becomes austenite, a first cooling process in which a cooling rate of the steel plate after the first heating process is partially changed, a first region which is a part of the steel plate is transformed into martensite, and a second region other than the first region remains as austenite, a second heating process in which the entire steel plate is reheated and the first region becomes tempered martensite, and a second cooling process in which the entire steel plate after the second heating process is cooled. At least one of the first cooling process and the second cooling process is performed during a molding process in which the steel plate is press-molded on a molding die.

公开(公告)号：US20180135147A1

公开(公告)日：2018-05-17

申请号：US15807645

申请日：2017-11-09

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： Eiichi OTA ,  Yasuhiro YOGO ,  Tomoaki IHARA ,  Shinobu OKUMA

IPC分类号： C21D9/48 ,  C21D1/673 ,  B21D22/02

CPC分类号： C21D9/48 ,  B21D22/022 ,  B21D22/208 ,  C21D1/22 ,  C21D1/673 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

摘要： A hot-press molding method of the present disclosure includes a first heating process in which a steel plate is heated and the entire steel plate becomes austenite, a first cooling process in which a cooling rate of the steel plate after the first heating process is partially changed, a first region which is a part of the steel plate is transformed into martensite, and a second region other than the first region remains as austenite, a second heating process in which the entire steel plate is reheated and the first region becomes tempered martensite, and a second cooling process in which the entire steel plate after the second heating process is cooled. At least one of the first cooling process and the second cooling process is performed during a molding process in which the steel plate is press-molded on a molding die.