Journal
CIRP ANNALS-MANUFACTURING TECHNOLOGY
Volume 59, Issue 1, Pages 291-294Publisher
TECHNISCHE RUNDSCHAU EDITION COLIBRI LTD
DOI: 10.1016/j.cirp.2010.03.107
Keywords
Hot stamping; Sheet metal; Quenchable steel
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Tailor die quenching in the hot stamping of quenchable steel sheets was developed to produce ultra-high strength steel formed parts having strength distribution. Local portions of the heated sheet were quenched by holding grooved tools at the bottom dead centre during the stamping. Non-contact portions were generated in the sheet by grooving the tools, and thus the strength in the contact portions is high owing to the quenching and that in the non-contact portions is low owing to the lack of the quenching. Hat-shaped products having a tensile strength of approximately 1.5 GPa only at four corners were formed. (C) 2010 CIRP.
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