L-shaped extrusion device for producing ultra-fine crystal block body material

Abstract

The extrusion apparatus for preparing superfine crystal block material has one structure comprising a die holder, a connecting seat, a conic die case, a conic die core, a wedged extruding rod with reduced extrusion force to avoid cracking of the block, a turning unit, a square vertical channel, a square horizontal channel and a product outlet. The product has high crystal grain fining and smooth surface, and the extrusion apparatus has simple structure, excellent mechanical performance, easy installation and use, and no pollution.

Description

Technical field [0001] The invention relates to an L-shaped extrusion device for preparing ultrafine crystal bulk materials, belonging to the technical field of cold extrusion plastic forming of ultrafine crystal bulk materials. Background technique [0002] Ultra-fine crystal bulk material is a new type of material whose crystal grains are refined to submicron and nanometers. It has good mechanical properties such as rigidity and strength, such as aluminum, copper, magnesium, iron and other crystalline materials, which have a wide range of applications. Value, often used in machinery, electronics, national defense and other industries. Due to the emergence of large plastic deformation technology, the application of ultra-fine crystal bulk metal materials has been well developed, and has good application value and prospects. [0003] Equal channel angular extrusion technology, referred to as ECAP technology, is an emerging technology field that is currently concerned by the scien...

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Problems solved by technology

[0005] The inner channel of the equal-channel angular extrusion die device also has various forms, such as S-shaped, C-shaped, U-shaped, L-shaped, etc., which are selected and designed according to the type of material and requirements. The inner channel of the L-shaped mold is made of metal material The commonly used form of superfineness has the characteristics of large equivalent effect variable and uniform deformation in a single extrusion, so it is widely used. However, after the material passes through a 90° turning angle, the surface is subjected to tensile stress, and the internal stress increases, which is easy to appear. Microcracks will eventually lead to cracking of the bulk material, thus limiting the degree of grain refinement. At present, back pressure technology is also used to solve this problem, such as: back pressure piston, sliding base, increasing friction, but at the same time it also brings The mold is complicated, the friction force is increased, etc., and the problem of block cracking cannot be solved well, and the requirements of ultra-fine grains cannot be met, and the mold is easily damaged during the extrusion process.

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