阶梯轴类零件楔横轧成形的变形特征

Deformational characteristics of shaft parts shaped by cross wedge rolling

应用ANSYS/LS-DYNA建立楔横轧轧制阶梯轴的有限元模型,对轧制过程进行了模拟仿真,并分析了轧件在展宽段内应力场、应变场的分布情况以及轧件变形过程中金属的受力和流动情况。结果表明轧件所受应力表现为两拉一压状态,且轧件心部应力较大;应变表现为轧件轧细部分应变较大,应变由外层到内层逐渐减小,轧件心部应变最小。轧件两端变形,中部则基本未受影响,变形呈对称分布;轧制过程中,轧件径向压缩并轴向延伸,轧件应变最大区的位置由外部逐渐移至心部。

The finite element model of cross wedge rolling stepped shaft was established by use of the ANSYS/LS-DYNA software,and the cross wedge rolling process was simulated.Accordingly,the distribution of the rolled piece in both stress field and strain field at the stretching stage,the force condition and flow circumstances of the metal at the rolling deformation process were analyzed.The results show that the stress of the rolled piece which is larger in the cole of the rolling,consists of biaxial tension and uniaxial compression;the strain is lager in the thin rolled part and least in the cole,which decreases gradually from the outside to the inside.The deformation happened in both ends of the rolled piece and hardly in the middle,is symmetrically distributed.When rolling,the piece radially compressed and axially extended;the maximum strain shifted from the surface to the cole.