Comparison of barreling in lubricated truncated cone billets during cold upset forging of various metals

Experiments were carried out to generate data on cold upset forging of lubricated annealed commercially pure aluminium, copper and zinc solids of truncated cone billets. The measured curvatures of the barreled truncated cone billets of all the thz8e metals were found to closely conform with the calculated values on the assumption that the shape of the barrels was in the form of a circular arc. It was further found that the measured radius of curvature of barrels exhibited a linear relationship with a geometrical shape factor irrespective of the aspect ratios of the truncated cone billets. Further empirical relationship was established between the measured radius of curvature of the barrels and stress ratio parameter. A comparative study of barreling behaviour aluminium, copper and zinc during upset forging operation at lubricated condition is presented in this paper.