Reciprocating twisting and upsetting isometric angle forming method for preparing ultra-fine grain material

Abstract

The invention discloses a reciprocating twisting and upsetting isometric angle forming method for preparing an ultra-fine grain material. Based on a multi-station forming hydraulic machine, a combinedfemale die is adopted as the die, wherein an upper die and a lower die of the combined female die are split. An upper sliding block in the multi-station forming hydraulic machine is used for providing die combining force needed by the combined female die, and a die inner cavity of the combined female die is formed by sequentially connecting a left-side extruding channel, a twisting channel, a right-side extruding channel and an isometric angle extruding channel. Due to the fact that a left-side hydraulic cylinder located at the inlet end of the left-side extruding channel and a right-side hydraulic cylinder located at the inlet end of the isometric angle extruding channel are used for providing extruding force and back pressure force in turns. The right-side hydraulic cylinder is arrangedon an arc sliding rail, the position of the right-side hydraulic cylinder in the arc sliding rail is adjusted so that the set angle of the isometric angle extruding channel can be obtained. By meansof the reciprocating twisting and upsetting isometric angle forming method, the grain structure of the material can be refined to the ultra-fine grain level, the material strength and plasticity are obviously improved, the application range is wide, operation is easy and convenient, and industrial application is easy to achieve.

Description

Technical field [0001] The invention relates to the technical field of material processing methods, in particular to a reciprocating extrusion-twisting equal channel angle forming method for preparing ultrafine crystal materials. Background technique [0002] As one of the three pillar industries in the 21st century, materials play an important role in various fields of national construction. In recent years, with the rapid development of medical, transportation, electric power, aviation and other fields, the demand for high-performance materials has become stronger and stronger. As an emerging plastic deformation method, large plastic deformation can introduce a large amount of strain during the deformation process, has a strong grain refining ability, and can obtain sub-micron or even nano-sized grains. The control of the structure can obtain fine-grained materials with high strength and large plasticity. In recent years, the method of preparing ultra-fine-grained high-perfor...

AI Technical Summary

Problems solved by technology

However, in the existing large plastic deformation process, the reciprocating extrusion process has the problem of uneven material strain during the deformation process; the grain refinement effect of the multi-directional forging process is relatively weak, and the refinement effect is limited; Unbalanced load problem, poor repeatability for low-plastic and high-strength metal materials; high-pressure torsion process processing blank size is small, and industrial applications are greatly limited

The existing large plastic deformation process is difficult to meet the requirements of modern defense, industry, people's livelihood and medical fields for the preparation of high-performance fine-grained materials

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