Estimation of Main Technological Parameters for Equal Channel Angular Pressing Technique Design

Severe plastic deformation (SPD) has been known as a method for materials grain refining. Among its numerous techniques, equal channel angular pressing (ECAP) is the representative model for the theoretical analysis in the view of equipment design challenge. By rigid block model of plastic deformation zone, technological parameters such as high accumulative strain, hydrostatic stress, punch pressure and distribution of stress and strain state are estimated. A compressive hydrostatic pressure created by a friction force in a contact surface between a die and a workpiece, which is directly proportional to the strength of the treated material, prevents its fracture and increases punch pressure significantly. The paper presents a method used in metalworking for determining the main parameters. The solution can be used for the die design in comparing with other conventional technologies to overcome the difficulty.