Study on precise forming by combined warm extrusion for mine pick with rotary-wing

Since it is difficult to fill the rotary-wings of the pick with rotary-wing type,it is not easy to fill the die assembly with metal under conventional extrusion process.This paper presents a new technology of co-extrusion combining the upset-extrusion with radial-extrusion in the light of the characteristics of such work piece.This technology applies the method of radial-extrusion after die closure to advance radial metal flow and provides a new idea to form the complicated radial parts which are difficult to fill in.Based on above methods,a new technology program is presented for the production of rotary-wing type pick.Numerical simulation and experimental studies show that the technology program not only ensures the forming quality,but also reduces the forming force.