Numerical Simulation Of Ring Rolling Process By Dynamic Explicit FEA

Ring rolling is a specialized rolling process for manufacturing seamless rings, in which the diameter of the ring increases as the ring cross-section decreases by rolling. It has many characteristics such as saving forming force and production cost, increasing utilization ratio of energy and material, improving productivity and widening processing range of ring products etc. It is widely employed in many industrial domains.In this paper, based on the theories of finite element method and the theories of ring rolling, the calculation model of ring rolling processes has been established and calculated by dynamic algorithm finite element program. Detailed numerical results are obtained: the deformation of the ring-driven roll interface is larger than that of the ring-idle roll interface. In the center domain, the deformation of the ring is smallest. The distribution of normal pressure stress along the ring-roll interface is radial symmetry and the pressure stress is largest in the symmetry plane. The effect of the friction between rolls and ring can be ignored and the effect of the spread velocity of rolling on the deforrration of ring is illustrated. Then the cause and elimination of fishtail defect are investigated: a relative faster spread velocity is helpful 10 eliminating the defect. The position of the guide roll almost has no effect on the deformation of the ring, but has the important effect on the force appeared in the roll. Then the optimal position has been suggested the center position of the guide roll should be over the center of the green blank of ring.The simulation of profile ring rolling has been performed to get the process parameters. As a result, the rolling defect has appeared and the cause has been illustrated. The result has a good agreement with the experimental data.