Roller pass is one of the key factors affecting the product quality in the retained mandrel rolling process. The metal flow condition of rolling deformation area was researched using the FEA (finite element analysis) software Marc. The influences of the pass bottom radius,the sidewall radius,the sidewall angle,the roller shoulder fillet radius,as well as the roller gap on the rolling process under the conditions of different friction were discussed. Based on these results,the changes of the workpiece exit width,the mandrel axial force,the rolling force,and the rolling torque associated with various parameters were determined,which would provide the basis for designing the pass and determining the rolling condition reasonably.
