Friction behaviors in cold rotary forging of 20CrMnTi alloy

Cold rotary forging is a complicated metal forming technology with multi-factors coupling interactive effects. Among these factors, friction is of great importance because it not only determines the stable forming but also has a significant effect on the metal flow and materials forming limit. The purpose of this paper is to reveal the complicated friction behaviors in cold rotary forging. For this purpose, the relationship between stable forming conditions and friction coefficient is first obtained by the static analysis of cold rotary forging. Then, the effects of friction coefficient on the metal flow and materials forming limit are numerically explored.