An Investigation of the trimming of boron nitride steel (22MnB5) during the die-quenching process

The in-die hot trimming cuts the heated blanks during the phase transformation from an austenite phase to a martensite one. This process could reduce the total cycle time of the hot stamping process and enhance the tool life. The aim of the present work is to identify key parameters of the in-die ho...

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Bibliographic Details
Published in:Procedia engineering 2017, Vol.207, p.1540-1545
Main Authors: Kim, Dongearn, Jeon, Yong-Jun, Choi, Hyun Seok, Kang, Jeongjin, Kim, Yong-Dae, Heo, Young Moo, Kim, Jong Deok, Won, Si-Tae
Format: Article
Language:English
Subjects:
boron-steel
hot stamping
in-die trimming
trimming
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Summary:The in-die hot trimming cuts the heated blanks during the phase transformation from an austenite phase to a martensite one. This process could reduce the total cycle time of the hot stamping process and enhance the tool life. The aim of the present work is to identify key parameters of the in-die hot trimming, and therefore to secure the control chart for the sound surface-quality and the low die-wear in the blanking process of boron steels. The numerous experiments were carried out while varying the temperature of boron steel and the clearance between the punch and die. The pyrometer mounted on the blanking tool could measure directly the actual temperature of the boron steel located at the trimming site during the rapid cooling. Profiles, percentage of depth ratios, hardness, and microstructure of sheared zones are measured to characterize the influence of process parameters. From our investigation, the trimmed zone which has a desired surface quality and dimensional accuracy could be achieved in the temperature range from 500 to 550℃ and below the clearance of 5%.
ISSN:1877-7058
1877-7058
DOI:10.1016/j.proeng.2017.10.1075