L shape equal channel reciprocating extrusion die for preparing ultra-fine crystal material

Abstract

A reciprocated extrusion die for preparing the L-shaped channels of superfine materials belongs to the machine processing field. The invention comprises an upper part and a lower part; the lower part comprises a lower bottom plate, a slide plate, a cavity die and a cavity die cushion block; the upper part comprises a guide plate, a convex die, a convex die fixing plate, a convex die cushion block, an upper bottom plate, a spring and a discharge bolt; wherein, the cavity die is composed by connecting an inner ring and an outer ring; the squeezing die cavity of L-shaped channels is arranged in the cavity die; the outer ring is connected with the bottom plate; the cavity die cushion block is arranged between the inner ring and the lower bottom plate; the slide plate is arranged on the cavity die cushion block; the upper end of the convex die passes through the central hole of the convex die fixing plate and is fixed; the lower end passes through the central hole of the guide plate; the convex die fixing plate is connected with the bottom plate; the convex die cushion block is arranged between the convex die and the upper bottom plate; and the guide plate is connected with the upper through a discharge bolt which passes through the spring in the hole of the convex die fixing plate. The extrusion die has the simple structure, the high grain refining capacity and the convenient operation and realizes continuous production.

Description

technical field [0001] The invention relates to a die in the technical field of mechanical processing, in particular to a semi-continuous equal-channel angular extrusion die. Background technique [0002] Large plastic deformation technology (SPD for short), has a strong ability to refine grains, and can directly refine the internal structure of materials to submicron or even nanometer levels. The most promising method for materials. In recent years, large plastic deformation technology has been developed rapidly, mainly including: equal channel angular extrusion (ECAE), high pressure torsion (HPT), reciprocating extrusion (CEC), cumulative rolling (ARB) and so on. Among them, equal-channel angular extrusion and high-pressure torsion have developed the most rapidly due to their excellent thinning ability, but the application of high-pressure torsion is limited due to the small volume of the prepared material, and other processes also have obvious shortcomings. [0003] Fou...

AI Technical Summary

Problems solved by technology

③The refinement ability is strong, and the grain size of the material processed by this process is about 100nm~200nm; however, the biggest disadvantage of this technology is that the production efficiency is low, the disassembly of the mold is very inconvenient, and there is no temperature control device, which is not conducive to the large-scale production of magnesium alloys. plastic deformation

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