Abstract: Multi-wedge cross wedge rolling (MCWR) is one kind of plastic forming, including radial screwdown, axial extension and horizontal enlarging by both wedges at the same time. With the fast development of traffic and transport industry, the demand for long shafts such as train shafts and automobile semi-axes is daily on the increase. MCWR has many advantages in forming long shafts, such as saving roll surface remarkably, reducing equipment volume, high production efficiency, saving material and reducing cost. To give full play to the advantage of multi-wedge in significantly saving roll surface and to maintain wedging the work piece simultaneously by internal and external wedges, it is necessary to accurately ascertain the regularity of movement of the end of wedged parts. Elastic-plastic finite deformation finite element numerical method is used. The cross wedge rolling (CWR) process is simulated successfully according to actual operating conditions, the regularity of movement of wedged parts is analyzed and the regularity how movement is affected by technological parameters is elaborated. The regularity of movement of the end of wedged parts is discovered after the analog results are compared to the experimental results. The research results provide an important theoretical basis for the design of MCWR moulds and perfect the theory of MCWR.

Key words: Cross wedge rolling, Movement of the end of rolled parts, Wedged parts