High-pressure shearing deformation method and device for tubular materials

Abstract

The invention discloses a high-pressure shearing deformation method and device for tubular materials. The high-pressure shearing deformation method comprises the following steps of: firstly: selecting a workpiece to be machined, wherein the workpiece is tubular; respectively bounding the inner wall and the outer wall of the workpiece by adopting bonding objects; then directly applying the axial pressure to the end part of the workpiece so that the elastic deformation or tiny plastic deformation occurs in the workpiece; accumulating the hydrostatic pressure up to 1 to 15 GPa in the workpiece; afterwards, supplying a torque to one bounding object which is in contact with the outer wall or the inner wall of the workpiece so as to lead the bounding object to rotate around a central shaft of the workpiece; meanwhile, fixing the other bounding object, wherein under the action of the circumferential frictional force between the bounding objects and the inner wall and the outer wall of the workpiece, the interior of the workpiece rotates along materials with different radial thicknesses at different angular speeds, thereby realizing the circumferential shearing deformation of the workpiece. The high-pressure shearing deformation method has high technical feasibility and has no specific requirements for operation; and required equipment is simple and obtainable. Meanwhile, the high-pressure shearing deformation method is a new plasticity processing method which is realized by depending on the traditional extrusion equipment; and therefore, the functions of the traditional extrusion equipment are expanded.

Description

technical field [0001] The invention relates to the field of material processing engineering, in particular to a method and device for realizing circumferential shear plastic deformation of tubular materials, which are mainly applied to various metals and alloy materials, inorganic non-metallic materials and polymer materials, etc., to realize these The plastic deformation of the material under high hydrostatic pressure can control and optimize its structure and improve its performance. Background technique [0002] The severe plastic deformation (SPD) method is a general term for a series of plastic processing techniques with large deformation. The effect of the SPD method on grain refinement is obvious, and the internal structure of the material can be refined to submicron level, nanometer level or even amorphous state [R.Z.Valiev.Nature materials.2004(3):511-516.; R.Z.Valiev, A.K.Mukherjee. Scripta mater. 2001(44): 1747-1750.]. In recent years, the technology of prepari...

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Problems solved by technology

In this loading mode, the pressure is not directly loaded on the axial direction of the tubular material, and the hydrostatic pressure on the sample comes from the elastic deformation of the mandrel after compression. Since the elastic deformation of the material cannot be very large, it is difficult to produce high Hydrostatic pressure, so it can provide limited hoop friction, only suitable for pure metals with low strength, etc.

For materials with higher strength, since the friction force that can be generated cannot reach the yield strength of the material, it is prone to slipping and other phenomena, and the required deformation cannot be achieved.

[0005] Another problem with this method is that the baffles located at both ends of the tubular sample are a cantilever beam structure, which does not constrain the axial deformation of the sample enough. When the hydrostatic pressure on the sample is high, the material is easily squeezed out from the gap. , affecting the processing

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