40Cr凸轮轧槽不变轧制工艺的研究

Technology of rolling 40Cr cam with fixed groove

针对凸轮常见生产方法存在的材料利用率过低、产量低、生产周期长等问题,尝试了轧制成形工艺。基于DEFORM刚塑性有限元法建立了凸轮轧槽不变,只改变辊缝的多道次轧制过程的三维有限元模型。模拟分析总延伸系数不同时轧件的孔型充满度,确定出最佳轧制道次为2;分析坯料直径不同时轧件的孔型充满度及变形均匀性,确定出最佳坯料直径为Φ72 mm。在Ф160 mm×200 mm两辊轧机上验证了在最佳轧制道次和坯料直径下,40Cr凸轮的轧槽不变轧制成形工艺。实验得到轧件横截面组织分布与模拟应变分布规律一致,证明了模拟结果的准确性。

The conventional methods for processing disc cam has many problems such as low material utilization and production, long pro- cessing cycle etc. A new rolling method was tried, and a three-dimensional finite element model of rolling process with several passes was obtained by different roll gaps and constant groove based on DEFORM. After simulating the hole filling degrees of the roiled parts with dif- ferent total elongation coefficients, the best rolling pass of two was determined, and after simulating hole filling degrees and deformation degrees of the rolled parts with different billet diameters, the best billet diameter of φ72 mm was determined. In the φ160 mm ×200 mm mill, 40Cr cam rolling process with the optimal rolling pass and billet diameter was experimented. The structure distribution of experimen- tal roiled part is consistent with the simulated distribution of the effective strain, which proves that the simulation results are accurate.