Abstract: Multi-wedge cross wedge rolling technique is an advanced method for forming a long shaft part, but in the production process the influences of technological parameters of dies on the interface quality of workpiece is complicated. A three-dimensional finite element model for forming a long shaft part with the multi-wedge cross wedge rolling technique is established on the basis of the characteristic of multi-wedge cross wedge rolling die. The process of multi-wedge cross wedge rolling forming a long part is simulated on different technological parameters by means of ANSYS/LS-DYNA FEM software, then the influence rule of technological parameters on interface quality of workpiece is obtained. The rolling test is carried out under the same technological parameters as that of simulation, the test results tally with the simulation results. It is concluded that in the technological parameters the transition angle has the most influence on the interface quality of workpiece while the stretching angle has the least. The rational scope of transition angle is worked out. The research results provide the theoretical basis and reference for the design of dies for multi-wedge cross wedge rolling forming of long shaft parts.

Key words: Cross wedge rolling, Interface quality, Longshaft part, Multi-wedge, Technological parameters, Single-leg robot Redundant actuation Coordinated motion PSO