Behrens Bernd-Arno, Dröder Klaus, Hürkamp André, Droß Marcel, Wester Hendrik, Stockburger Eugen
Institute of Metal Forming and Forming Machines, Leibniz Universität Hannover, 30823 Garbsen, Germany.
Institute of Machine Tools and Production Technology, Technische Universität Braunschweig, 38106 Braunschweig, Germany.
Materials (Basel). 2021 Oct 12;14(20):5997. doi: 10.3390/ma14205997.
Friction drilling is a widely used process to produce bushings in sheet materials, which are processed further by thread forming to create a connection port. Previous studies focused on the process parameters and did not pay detailed attention to the material flow of the bushing. In order to describe the material behaviour during a friction drilling process realistically, a detailed material characterisation was carried out. Temperature, strain rate, and rolling direction dependent tensile tests were performed. The results were used to parametrise the Johnson-Cook hardening and failure model. With the material data, numerical models of the friction drilling were created using the finite element method in 3D as well as 2D, and the finite volume method in 3D. Furthermore, friction drilling tests were carried out and analysed. The experimental results were compared with the numerical findings to evaluate which modelling method could describe the friction drilling process best. Highest imaging quality to reality was shown by the finite volume method in comparison to the experiments regarding the material flow and the geometry of the bushing.
摩擦钻孔是一种在板材上制造衬套的广泛应用的工艺，这些衬套通过螺纹成型进一步加工以创建连接端口。先前的研究集中在工艺参数上，没有详细关注衬套的材料流动。为了真实地描述摩擦钻孔过程中的材料行为，进行了详细的材料表征。进行了温度、应变速率和轧制方向相关的拉伸试验。结果用于对约翰逊-库克硬化和失效模型进行参数化。利用材料数据，使用三维和二维有限元方法以及三维有限体积法创建了摩擦钻孔的数值模型。此外，还进行了摩擦钻孔试验并进行了分析。将实验结果与数值结果进行比较，以评估哪种建模方法能够最好地描述摩擦钻孔过程。与实验相比，有限体积法在材料流动和衬套几何形状方面显示出与实际最高的成像质量。
