利用有限元软件ANSYS对啮合同向双螺杆不同形式芯轴的受力状况进行有限元(FEM)模拟分析。通过比较几种芯轴在既定工况下第一主应力、变形和扭转角等,并加以分析,从而找出该工况下受力较好的芯轴形式。其中,六棱形芯轴受力情况最好,渐开线花键芯轴次之,受力最差的是平键芯轴。 Finite element (FEM) simulation analysis of the force condition of different forms of mandrel with intermeshing co-rotating twin-screw was carried out by using the finite element software ANSYS. By comparing the first principal stress, deformation and torsion angle of several kinds of mandrel under the given conditions and analyzing them, the mandrel form with better stress under this working condition can be found out. Among them, the hexagonal mandrel force best, followed by involute spline mandrel, the worst stress is flat key mandrel.