Cu-20%Fe粉末异步轧制有限元模拟及工艺参数影响规律

Finite Element Simulation of Asymmetrical Rolling for Cu-20%Fe Powder and Influence Law of Process Parameters

为研究高铁含量铜铁粉末异步轧制的成形规律及合理选取工艺参数,应用Shima-Oyane屈服准则,在MSC.Marc有限元软件中建立粉末轧制有限元模型,通过实验验证了该模型的有效性。利用仿真结合轧制实验方法分析了异速比、压下率、轧制速度、轧辊直径及辊面摩擦系数等工艺参数对生坯相对密度和轧制力的影响规律。结果表明:相较于粉末对称轧制,采用异步的方式能显著减小轧制力,提高生坯密度分布均匀性;过大的压下率和轧辊直径分别会对生坯造成边裂和缠辊等不良影响,过低的压下率和摩擦系数导致生坯不能顺利轧制成形。实验结果与有限元模拟结果相符,相对密度模拟结果最大误差为3.89%,轧制力模拟结果最大误差为9.49%,研究结果对铜铁粉末异步轧制成形工艺优化有较好的借鉴价值。

To investigate the forming law of asymmetrical rolling of copper-iron powder with high iron content,and select reasonable process parameters,the MSC.Marc finite element software was used to create the copper and iron powder rolling finite element model based on the Shima-Oyane yield criterion.The finite element model was verified by experiments.The influence of process parameters such as differential speed ratio,reduction ratio,rolling speed,roller diameter and friction coefficient on the relative density and rolling force of green sheet were analyzed by simulation and rolling experiment.The results show that asymmetric rolling can significantly reduce the rolling force and improve the uniformity of green sheets density distribution compared with powder symmetric rolling.When the reduction ratio and roll diameter are too large,the green sheets suffer edge cracking and roll wrapping relatively,and too low reduction ratio and friction coefficient result in unsmooth forming of the green sheets.The test results agree well with the finite element simulation results.The maximum error of the relative density simulation results is 3.89%,and the maximum error of the rolling force simulation results is 9.49%.The research results have a good reference value for the optimization of asymmetrical rolling forming process of copper-iron powder.