Characterization of residual stresses in austenitic disc springs induced by martensite formation during incremental forming using micromagnetic methods
Characterization of residual stresses in austenitic disc springs induced by martensite formation during incremental forming using micromagnetic methods
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DOI：
10.3139/120.111012
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发表时间：
2017-04-01
影响因子：
2.5
通讯作者：
Walther, Frank
中科院分区：
文献类型：
--
作者：
Baak, Nikolas;Garlich, Markus;Walther, Frank
碟形弹簧是一种非常常见和重要的机械元件，几乎应用于机械工程的所有领域。它们适用于需要高弹簧力且只有很小安装空间的场合，例如离合器或滚动轴承。喷丸强化产生的残余应力显着提高了材料的性能，但同时也增加了生产时间和成本。本文研究了一种增量成形工艺，该工艺允许在一次设置中形成弹簧几何形状并产生残余应力。需要精确测量弹簧性能以控制产品性能，特别是在引入新工艺时。应用磁测量来控制弹簧性能的可能性进行了评估。建立了弹簧特性与磁巴克豪森噪声包络之间的关系。研究结果支持残余应力测量和光学显微镜，显示马氏体岛所造成的增量形成。
Disc springs are very common and important machine elements used in almost all fields of mechanical engineering. They are applied when high spring forces are required and only a small mounting space is available, for example, in clutches or rolling bearings. Residual stresses induced by shot peening improve the performance significantly, at the same time shot peening increases the production time and cost. This paper investigates an incremental forming process that allows forming of the spring geometry and generation of residual stresses in a single setup. Accurate measurements of the spring performance are needed to control the product properties, especially when new processes are introduced. The possibility to apply magnetic measurements to control the spring properties is evaluated. A relation between spring characteristics and magnetic Barkhausen noise envelope is established. The findings are supported by residual stress measurements and light optical microscopy, showing martensite islands caused by incremental forming.