Liu Yang, Liu Jing, Herrmann Marius, Schenck Christian, Kuhfuss Bernd
Bremen Institute for Mechanical Engineering-bime, Badgasteiner Str. 1, 28359 Bremen, Germany.
University of Bremen, Bibliothekstraße 1, 28359 Bremen, Germany.
Materials (Basel). 2020 Dec 24;14(1):58. doi: 10.3390/ma14010058.
Rotary swaging is an incremental metal forming process widely used to reduce the cross-section of parts. For tubular parts, the final wall thickness also changes during the process. The lubricant condition is a factor, which affects these geometry changes. Beneath the change of the geometry, the complex material flow during the process determines the final geometry and the mechanical properties. Therefore, with a thorough insight into the material flow, it could be understood how to control it in order to achieve desired properties. Producing tubes with uniform outer diameter and changing inner profiles is an application of this method. Furthermore, applying this method, different local cold hardening could be achieved by different total strain. In this study, the dependency of the material flow on the lubrication conditions was investigated. Simulations with combined hardening material models were verified by the change of the wall thickness of tubes. It was found that friction condition significantly influences the back shifting of the workpiece and the elongation caused by each stroke. Results from simulations and experiments showed that a certain lubricant condition leads to the highest axial elongation of the workpiece.
旋锻是一种增量金属成型工艺，广泛用于减小零件的横截面。对于管状零件，最终壁厚在加工过程中也会发生变化。润滑条件是影响这些几何形状变化的一个因素。在几何形状变化之下，加工过程中复杂的材料流动决定了最终的几何形状和机械性能。因此，通过深入了解材料流动，可以明白如何控制它以获得所需性能。生产具有均匀外径和变化内轮廓的管材就是这种方法的一种应用。此外，应用这种方法，可以通过不同的总应变实现不同的局部冷硬化。在本研究中，研究了材料流动对润滑条件的依赖性。通过管材壁厚的变化验证了采用组合硬化材料模型进行的模拟。结果发现，摩擦条件显著影响工件的后移以及每次行程引起的伸长。模拟和实验结果表明，特定的润滑条件会导致工件的轴向伸长最大。
