利用ABAQUS/Explicit模拟了变厚度轮辐双道次强力旋压过程,给出了建模和分析结果.轮辐旋压成形伴随板坯的剧烈减薄,收口区域较难成形,减薄率达50%,在计算中,轮辐有限元网格畸变严重,为此运用ALE技术改善网格质量,提高了计算精度.对模拟的旋压轮辐厚度与实验测量值进行了对比,二者吻合较好,验证了计算模型和结果的可靠性.通过ABAQUS/Standard计算了轮辐旋压成形后的回弹变形量和残余应力,分析成形后轮辐等效应变分布及回弹特征,研究发现,回弹变形量与旋压成形时壁厚变化量成正比.
The ABAQUS/Explicit was used to model the two-pass power spinning process of the automobile spoke with varying thickness, and the elastic-plastic finite element method （FEM） was carried out to simulate the forming and springback. The severe thinning of a blank was generated with the spinning proceeding, and the formability becomes low at the close up of the spun spoke due to the thickness reduction of 50%. During the simulation, because the FE meshes at the deformation area were distorted seriously, the Arbitrary Lagrange Eul- er （ALE） technology was used to prevent the mesh distortion and improve the calculation accuracy. The simu- lated thickness of the spun spoke has good agreement with the measured thickness from experiment. The spri- ngback and the residual stress in a spun spoke were calculated by ABAQUS/Standard. The distribution of e- quivalent plastic strain and springback characteristic are analyzed, and the springback is proportional to the thickness reduction.
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