Determination of Residual Ductility in the Forging of Bars on a Lever-Type Radial Forging Machine

Abstract

A method is proposed for determining the residual ductility of the material of a semifinished product. The method makes it possible to forge bars on a radial forging machine with the use of technically sound regimes for the reduction of semifinished products. The investigation that was performed involved both theoretical and experimental research. The theoretical part included determination of the stress state in the deformation zone in accordance with a new mathematical model, determination of the shear strain and ductility of the metal, and evaluation of its residual ductility in the forging of bars on a radial forging machine. In addition, an experiment was performed which involved the multi-pass forging of bars of different alloys with different reductions in each pass. The adequacy of the model was checked by comparing the calculated data with the experimental results obtained by forging bars made of different alloys.