Li Yi, Li Mingzhe, Liu Kai, Li Zhuo
Dieless Forming Technology Center, Jilin University, Changchun 130025, China.
Materials (Basel). 2018 Oct 8;11(10):1906. doi: 10.3390/ma11101906.
As the local forming non-uniform of the formed curved surface part with larger bending deformation is the one of common defects, the utilization ratio of metal plate greatly reduces due to this defect, and cost of production is also increasing. In this paper, the differential speed rotation technology of flexible rolling process was proposed firstly to solve this forming defect. The finite element model was established, the reason of the local forming non-uniform was discussed; the effect of differential speed rotation technology on the forming uniform was studied. The results show that: Flexible rolling is a process based on thickness reduction, in this forming process, the thickness reduces sharply near the back end of metal plate, the local forming non-uniform of formed curved surface part is caused during this process; the differential speed rotation technology is applied in flexible rolling, with increasing rotation speed difference between upper and lower roll set, the forming uniformity of the formed curved surface part is greatly improved. The results of numerical simulation are in agreement with the result of forming experiments.
由于弯曲变形较大的成型曲面零件局部成型不均匀是常见缺陷之一，这种缺陷使金属板材的利用率大大降低，生产成本也随之增加。本文首先提出柔性轧制过程中的差速旋转技术来解决这一成型缺陷。建立了有限元模型，探讨了局部成型不均匀的原因；研究了差速旋转技术对成型均匀性的影响。结果表明：柔性轧制是基于减薄厚度的过程，在此成型过程中，金属板材后端附近厚度急剧减小，在此过程中导致成型曲面零件局部成型不均匀；在柔性轧制中应用差速旋转技术，随着上下轧辊组转速差的增大，成型曲面零件的成型均匀性得到极大提高。数值模拟结果与成型实验结果一致。
