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Press hardening
Hot stamping (also known as press hardening or hot press forming) is a relatively new technology which allows ultra-high strength steels (typically 22MnB5) to be formed into complex shapes, which is not possible with regular cold stamping operations.〔So, H., D. Faßmann, H. Hoffmann, R. Golle & M. Schaper. "An investigation of the blanking process of the quenchable boron alloyed steel 22MnB5 before and after hot stamping process", Journal of Materials Processing Technology 212, 437-449 (2012).〕
==Methods==
1) Indirect Process: the blank is formed, trimmed, and pierced in cold condition (i.e., state 1 in below figure). It is later heated and quenched in a die to get high strength properties.
2) Direct Process: the unformed blank is heated in a furnace, formed in hot condition (state 2 in below figure), and quenched in the die to achieve the required properties.
Selection of the process depends on part complexity and blank coating (Zn based coatings typically require indirect process). In either method, the blank is formed in a much softer and formable state and is later hardened in the dies, which have drilled cooling channels. A typical hot stamped components has 1000 MPa (145 ksi) Yield Stress and 1500 MPa (215 ksi) Ultimate tensile strength.〔Kurz, T., "New Developments in Zinc Coated Steel for Press Hardening", in Insight Edition Conference, September 20–21, Gothenburg, Sweden (2011).〕〔Watkins, J., "Material Development", in AP&T Press Hardening, Next Step Seminar, Novi, MI, October, (2011).〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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