Cold Forging of Hollow Cylindrical Components Having an Intermediate Flange — Ubet Analysis and Experiment

Abstract

Possible cold forging operations to form hollow cylindrical Componeats having a circular intermediate flange are first proposed. The material deformation and forging pressures for these program, the basic concept of which is hased on the Unit Element Regions due first to Kudo. With the emergence of the computer revolution, the use of the Unit Element Regions was implemented as the URET program by Avitzur and others. In the present study it is assumed that the material is non-hardening, and the frictional stress over the tool-workpiece interfaces is negligible. Cold forging experiments with annealed aluminium billets or slugs are also performed to observe deformation, defect formation and working pressure. The experimental results are compared with the theoretical results which are obtained by modification of the non-hardening results to allow for the work-hardening. The coincidence is found to be fair. Finally, the relative merits and demerits among the proposed forging methods with regard to the load, unit pressure, energy and defect are discussed on the basis of the theoretical and experimental results.