抄録
This paper presents a tribology model for hot forging operations. The friction model considers contact patches where an initial film thickness is entrained at the contact patch edges and evolves within the patch during the forging operation. The initial entrained film thickness is obtained from simplified solutions of the Reynolds equation. Film thickness evolution is dictated by a Reynolds equation formulation that includes the stretch term and roughness effects on lubricant transport. Surface roughness of the workpiece is allowed to evolve in the process, and the real fractional contact area is then calculated based on the roughness and film thickness assuming a Gaussian surface. Friction is calculated based on the real area of contact. The program is implemented as a user routine in a popular commercially available finite element code, DEFORM 2D.
