Chances and risks when using high strength steel sheets in structural parts of modern car bodies
Chances and risks when using high strength steel sheets in structural parts of modern car bodies
复制标题
现代汽车车身结构件使用高强度钢板的机会和风险
DOI:
10.1007/978-3-658-05130-3_33
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Radonjic
中科院分区:
文献类型:
--
作者:
Wagner;S.Liewald;Radonjic
Nowadays, the automotive industry is challenged by increasing environmental regulations as well as continuous enhancement of the standard requirements regarding passenger’s safety. Such tendencies lead to increased use of advanced high strength steels (AHSS) for manufacturing of dedicated car body components which are placed in many areas within car bodies structure, such as the floor, centre tunnel, side sills, roof arch, etc. AHSS are multi-phase steels which contain martensite, bainite and/or retained austenite. The combination of higher yield strengths together with a lower total elongation of AHSS brings a new challenge to the forming process for inner reinforcement parts. Forming of AHSS requires higher press and binder forces, while insufficient blank holding capacity can lead to arising of wrinkles. Also such materials do reveal tremendously high springback amount when compared to forming of mild steels. This paper discusses behaviour of AHSS in deep drawing process with emphasis on how to improve dimensional accuracy of part. In order to reduce and compensate the springback amount afterwards, different forming and restriking strategies which consider modification of the part shape features, tool geometry and stress-strain condition were introduced.
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