METHOD FOR ACHIEVING HIGH-PRESSURE SHEARING DEFORMATION IN TUBE MATERIALS BY WEDGE PRINCIPLE AND APPARATUS THEREFOR

摘要

A method of achieving high-pressure shearing deformation in tube materials by the wedge principle and an apparatus therefor. The method involves: selecting a workpiece to be processed (3), and using constraining bodies to respectively constrain the inner wall and the outer wall of the workpiece (3); exerting an axial pressure on the constraining bodies, increasing the axial force by taking advantage of the force amplifying principle of the wedge, and converting to a positive pressure in a direction perpendicular to a contact surface with the workpiece (3), thereby obtaining a high hydrostatic pressure inside the workpiece (3); providing a torque to one of the constraining bodies such that the constraining body rotates around a central axis of the workpiece (3), while fixing the other constraining body; or providing a torque to the two constraining bodies at the same time in opposite directions, such that the two constraining bodies rotate relatively around the central axis of the workpiece (3); and under the action of a tangential frictional force between the constraining bodies and the inner and outer walls of the workpiece (3), materials inside of the workpiece (3) at different radial thicknesses rotate at different angular velocities, achieving shearing deformation of the workpiece (3). Using the completely new plastic processing method implemented by conventional pressure devices expands the function of the conventional pressure devices, the feasibility thereof is high, operation thereof has no specific requirements, and the required device is simple.