Vortex extrusion type large-plastic deformation device

Abstract

The invention discloses a vortex extrusion type large-plastic deformation device which comprises a device main body, wherein the device main body comprises an outer-layer reinforcing ring and an inner-layer concave die in interference fit with the outer-layer reinforcing ring, the inner-layer concave die is provided with a twisting extrusion chamber which is necked from the upper port to the lower port, a twisting extrusion deformation region is formed in the twisting extrusion chamber and comprises a deformation band composed of a plurality of stripe projections or a plurality of stripe grooves, the upper end portions of the stripe projections or the stripe grooves are capable of extending to the upper port of the twisting extrusion chamber, and the lower end portions of the stripe projections or the stripe grooves are capable of extending to the lower port of the twisting extrusion chamber. The vortex extrusion type large-plastic deformation device integrates twisting and extrusion techniques, so that the device is capable of realizing twisting of a material without rotating the die with an extra device and capable of achieving the same effect only through structural design; besides, the device is capable of preventing sliding between the material and the die while twisting; moreover, the device is simple and convenient in design.

Description

technical field [0001] The invention relates to a scroll extrusion type large plastic deformation device. Background technique [0002] At present, the demand for submicron and nanostructured materials mainly exists in many industries such as aviation, military, medical equipment, electronics, etc. The high-pressure torsion method is an effective plastic processing method for producing bulk submicron and nanocrystalline materials. This method is a special plastic deformation process in which the deformed body produces axial compression and tangential shear deformation by applying a torque on its cross section through active friction while applying pressure in the height direction of the deformed body. The study found that after severe torsional deformation under high pressure, a uniform structure of high-angle grain boundaries was formed inside the material, the grains were significantly refined, and the properties of the material also changed qualitatively. However, this m...

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Problems solved by technology

However, this method has high requirements on the device, needs to refit the press and add additional torsion equipment, and the implementation technology is complex

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