Barrelling in truncated lubricated zinc cone billets during cold upset forging

Experiments were carried out to generate data on cold upset forging of lubricated annealed commercially pure zinc solid of truncated cone billets. The measured curvatures of the barreled zinc truncated cone billets 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.