汽车发动机带轮的冷辗扩成形机理

Cold rolling mechanism on automobile engine pulley

为了实现发动机带轮冷辗扩的精确成形,基于Simufact软件建立了发动机带轮两道次冷辗扩有限元模型,分析了带轮冷辗扩成形过程的等效应力场、等效塑性应变场演变规律,阐明了其变形机理。根据带轮冷辗扩有限元模拟,进行了冷辗扩轧制实验。研究表明:带轮在两道次冷辗扩成形过程中,轧辊与带轮的接触区域为主要变形区,变形最为剧烈,其中带槽处的等效应力值和等效塑性应变值最大;适当地增加带轮第2道次冷辗扩精整阶段的时间,可有效消除环件端面的宽展缺陷;采用两道次冷辗扩工艺成形汽车发动机带轮,冷辗扩过程平稳,获得了端面宽展小、尺寸精度高的环件,验证了有限元模拟的正确性。

In order to realize the precise forming of cold rolling for engine pulley, a two-pass cold rolling finite element model of engine pulley was established based on Simufact software, the evolution laws of equivalent stress field and equivalent plastic strain field in the cold rolling process of pulley were analyzed, and its deformation mechanism was clarified. Then, according to the finite element simulation of cold rolling for pulley, the cold rolling experiment was carried out. The research shows that during the two-pass cold rolling process of pulley, the contact area between roller and pulley is the main deformation area, the deformation is the most severe, and the equivalent stress and equivalent plastic strain values at the groove are the largest. Properly increasing the time of finishing stage in the second pass of cold rolling for pulley can effectively eliminate the widening defect in the end face of ring. Thus, the automobile engine pulley is formed by two-pass cold rolling process, the cold rolling process is stable, and the ring with small width end face and high dimensional accuracy is obtained, which verifies the correctness of the finite element simulation.