In the present study curved tangential velocity patterns are proposed for the analysis of the plane strain ring rolling process. Two kinds of velocity patterns are used for determination of roll torque based on the upper bound theorem. Then roll separating forces are determined approximately by force equribrium. The computation results are compared with the reported experimental data as well as the previous theoretical results from linear tangential velocity patterns. Then it is shown in torque prediction that the present method using curved t.v.d. patterns are in much improved agreement with the experiment than the method by linear t.v.d. patterns. However, for load prediction linear t.v.d. patterns are found to be better than curved t.v.d. patterns.
Various effects of process variables are discussed and it is show that the present method can be effective used for process design of plane strain ring rolling process.
