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
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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
Radonjic
中科院分区:
--
文献类型:
--
作者:
Wagner;S.Liewald;Radonjic

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如今,汽车行业面临着越来越多的环境法规以及对乘客安全标准要求的不断提高的挑战。这种趋势导致越来越多的人使用先进的高强度钢(AHSS)来制造专用车身部件,这些部件安装在车身结构的许多区域,如车底、中央隧道、侧梁、车顶拱门等。AHSS是含有马氏体、贝氏体和/或残余奥氏体的复相钢。AHSS较高的屈服强度和较低的总延伸率给内加强件的成形工艺带来了新的挑战。AHSS的成形需要较高的压制力和粘结力,而压边力不足会导致起皱。此外,与软钢的成形相比,这种材料显示出非常高的回弹量。本文讨论了AHSS在拉深过程中的表现,重点讨论了如何提高零件的尺寸精度。为了减少和补偿后续的回弹量,引入了不同的成形和重击策略,其中考虑了修改零件的形状特征、刀具几何形状和应力应变条件。
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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