Assessment of Cold Extrusion Effect on Stress-Strain Curves of Pure Copper Arc Parts Based on the Cosine Velocity Model

摘要

Cold extrusion provides manufacturing precision of pure copper arc parts, which requires a reduction in the forming force and elastic deformation. The functional models of constant strain rate and cosine velocity upsetting of pure copper were constructed using its thermomechanical simulation data. They were well verified by FEM, proven to be consistent with experimental stress-strain relations. The potentials of cold extrusion based on the cosine velocity and its application in the manufacturing of pure copper arc parts were presented. The equivalent stress of cold extrusion based on a cosine velocity is reduced as compared to the conventional constant-velocity one. Adequate extrusion conditions were chosen to form a pure copper arc part that fulfilled the design requirements verified by the cold extrusion test, thereby achieving a near-net shape of interior and exterior surfaces.