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摘要
A thermo-mechanical coupling finite element (FE) model for hot power spinning of ZK61 magnesium alloy cylindrical parts with inner ribs was established by ABAQUS/explicit platform, the rheological characteristics of material during hot power spinning were explored, the influence of inner-rib parameters (shape and number of inner ribs) on material flow and filling of inner ribs was studied, and the reliability of the established thermo-mechanical coupling FE model was verified by tests. The results show that the formation of inner ribs mainly relies on the inflow of inner layer material along the radial direction of the blank, and the split-flow of inner layer material occurs on both sides of the inner rib, part of the material flows along radial direction and forms the inner rib, while the rest material flows along tangential direction and forms the cylindrical wall; using trapezoidal inner ribs and increasing the number of inner ribs are conducive to the filling of inner ribs. The relative errors between the inhomogeneity degree of rib height, wall thickness and rib height obtained by simulation and test results are less than 8%, which indicates the accuracy of simulation results. ? 2022, Editorial Board of Journal of Plasticity Engineering. All right reserved.
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