Contact Friction in Metal Drawing and Upsetting. Part 2

Abstract

A new method is proposed for determining the frictional index by repeated wire extension. The frictional conditions are investigated with change in the extension, the drawplate taper, and other parameters. A general formula for the frictional characteristics and the drawing stress is proposed. The influence of the lubricant on the friction in deformation of the forgings is shown. Formulas for the frictional characteristics as a function of the form factor are derived. These formulas yield accurate results for the mean normal contact strength.