Extrusion and torsion combined processing die and method capable of achieving multi-directional shear

Abstract

The invention relates to the technical field of plastic processing, in particular to an extrusion and torsion combined processing die and method capable of achieving multi-directional shear. The extrusion and torsion combined processing die capable of achieving multi-directional shear comprises a male die, a female die and a back pressing device. The top of the male die and a pressing head of a press machine are connected and fixed, and the bottom of the female die and a lower die holder are fixedly connected. The female die comprises a die core and a die holder, and a cavity which is used forprocessing blanks is formed in the die core. According to the extrusion and torsion combined processing die and method capable of achieving multi-directional shear, the reasonable die design is conducted, the extrusion and torsion process and the variable channel angular pressing process are combined, and therefore extrusion and torsion combined deformation can be achieved, and deformation causedby multi-directional shear including circumferential shear and radial shear can also be achieved; the purposes of improving the material organizations and regulating and controlling the texture are achieved by use of the cooperation of compression deformation and shear deformation; and due to the fact that the back pressing device is added, materials can be in a three-dimensional compressive stress state, the deformability of the materials is improved, and then deformation of low-plasticity difficult-to-process materials is accomplished. The extrusion and torsion combined processing die and method capable of achieving multi-directional shear can achieve deformation processing of bar materials and sectional materials, and produced materials have fine-grain or ultra-fine-grain organizations.

Description

technical field [0001] The invention relates to the technical field of plastic processing, in particular to a extrusion-twisting composite processing die and method capable of realizing multi-directional shearing. Background technique [0002] In recent years, large plastic forming technology with shear strain has become a research focus and focus. After the material undergoes large plastic deformation, it can accumulate a large equivalent plastic strain, so that the grains of the material can be refined, and can reach ultra-fine grains or even nanocrystals; at the same time, shear strain is conducive to the accumulation of internal energy in the material, which can improve the quality of the material. The distribution of the texture can significantly reduce its anisotropy. Commonly used large plastic deformation technologies include: Equal Channel Angular Pressing (ECAP), High Pressure Torsion (HPT), Reciprocating Extrusion (Cyclic Extrusion Compression, CEC), Multi-Direct...

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Problems solved by technology

Patent Publication No. CN103551415A introduces a metal variable cross-section extruding and twisting forming device and method, which can realize torsional deformation while extrusion deformation, but the torsional deformation is only circumferential shear deformation

Patent Publication No. CN103785702A introduces a vortex extrusion type large plastic deformation device, which uses some deformation belts formed by strip-shaped protrusions or grooves, and realizes torsional shear deformation with the assistance of deformation belts. This method realizes extrusion torsional composite deformation, But its material utilization rate is low

Patent Publication No. CN201520075843 introduces a variable-section spiral extrusion die. Through the design of the spiral channel, the material undergoes circumferential shear deformation while extrusion deformation, and radial shear deformation cannot be achieved.

The above mold design and processing methods can achieve simultaneous accumulation of extrusion deformation and shear deformation, but the shear direction is mostly a single type of shear (mostly circumferential shear), and compression deformation and multi-directional shear types cannot be realized cooperation

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