Extrusion die with multiple corners and forming method thereof

Abstract

The invention discloses an extrusion die with multiple corners and a forming method thereof and belongs to the technical field of material extrusion. The extrusion die comprises a puncher pin, a bolt, an upper die and a lower die, wherein the upper die and the lower die are tetrahedron, the lower surface of the upper die is provided with a downward groove while the lower surface of the lower die is provided with an upward groove, both sides of the grooves of the upper and lower dies are respectively provided with bolt holes, the upper die and the lower die are fastened by bolts, the grooves of the upper and lower dies are formed into an extrusion die cavity which has multiple corners. Through the die, fine and equiaxed crystals are easily formed; the problems of uneven structures and complex processes in primary ECAP (equal-channel angular pressing) formation materials are effectively overcome; the die is simple in structure, easily processed and prepared into various fine metal, alloys, intermetallic compounds, composite materials and other ultrafine-grained materials, or prepared into difficult-to-deformation metal, such as magnesium alloy, thus the one-pass extrusion technique with multiple corners is achieved and its production efficiency is high.

Description

Technical field [0001] The invention is a material extrusion technology field, which involves a multi -rotor squeeze mold and forming method. Background technique [0002] Equal channel angular presing (ECAP) is one of the methods of forming the forming of blocks of blocks based on severe plastic deformation technology.The material is strongly cut and deformed at the corner of the ECAP mold, and the size of the section of the material is unchanged, so as to achieve repeatedly squeezing, accumulating a large number of strain, and achieving the purpose of refining the material organization and improving the comprehensive performance of the material.Although the study of ECAP's preparation of ultra -fine crystal materials has obtained everyone's consensus, it has also found that there is a problem of uneven deformation, which is close to the inner corner φ [0003] The materials of the materials are large and the detailed effect is good, but at the outer corner, the response is smal...

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Problems solved by technology

[0006] The present invention aims to provide a multi-angle extrusion die and forming method, which solves the problems of uneven deformation and cumbersome process of extrusion blanks in the existing ECAP technology

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