Theoretical analysis of extrusion through rotating container: Torque and twist angle

In order to evaluate the deformation behavior of billet, calculation models of twist angle along the circumferential direction are obtained on account of theory derivation. And the process of extrusion through rotating container is in-depth analysis by using of numerical simulation. The research results show, with the increasing of container angular velocity, the axial twist angle on the outer space of billet presents an increasing tendency under the effect of a constant friction factor. But the increasing magnitude becomes small and tends to be a certain value. The curving degree of intersecting lines tends to be decreased instead of increasing. With the comparison, the curving degree is directly proportional to extruding temperature, angular velocity of container and friction factor. But the extruding speed presents an inverse relationship with the curving degree. The torque model of extrusion is obtained and it can provide theoretical bases for process formulation and device design.