Mechanics of continuous equal-channel angular extrusion

The paper discusses possible approaches for realization of continuous equal-channel angular extrusion (ECAE). A practical interest presents Conform ECAE (CECAE) converting an inlet channel into a friction press. Slip line solutions and plastic zones are analyzed for different cases of active and passive frictions. It is shown that CECAE provides lower extrusion pressure, higher effective strains and better approximation to simple shear deformation mode than ordinary ECAE. Specific distributions of plastic friction depending on a slip between material and roll are introduced for the beginning stage, steady CECAE and during slippage. The paper describes a few designs of CECAE. Optimization of the main characteristics is performed for the concept of CECAE with an additional coining roll.