A mold and method for preparing ultrafine crystal bulk material

A block material and ultra-fine grain technology, applied in the direction of metal extrusion dies, etc., can solve problems such as hindering industrial applications, discontinuous processing, and consuming production time, so as to achieve smooth changes, improve forming quality, and prolong die life. Effect

Inactive Publication Date: 2016-04-13
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The ECAP process provides a pure shear deformation zone and can produce large bulk materials, but the plastic strain in a single pass of the existing ECAP process is about 1, which is not enough to accumulate a large enough plastic strain (>4 ), usually using multi-pass repeated extrusion to accumulate large plastic strain, and the loading brought by multi-pass repeated extrusion, local grinding of the sample shape, resulting in discontinuous processing, consuming production time, and low production efficiency , which seriously hinders the process of industrial application

Method used

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  • A mold and method for preparing ultrafine crystal bulk material
  • A mold and method for preparing ultrafine crystal bulk material
  • A mold and method for preparing ultrafine crystal bulk material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Apply the mold for preparing ultra-fine crystal block materials proposed by the present invention, determine the inner angle Φ=90° and outer angle Ψ=30° of the extrusion channel (8) of the mold, and use a 30-ton press.

[0032] Step 1, pretreatment: firstly, the extrusion material is selected as the metal block material aluminum alloy 2024 that can be strengthened by heat treatment, and then the metal block material aluminum alloy 2024 is processed into a round bar φ10mm×60mm, and then it is used to improve the round bar Solid solution pretreatment of the plastic forming ability of the material, the specific process conditions can be checked through the aluminum alloy heat treatment manual: keep at 500 ° C for 40 minutes, and then water cool to room temperature;

[0033] Step 2, rotating channel equiradial parallel extrusion: MoS 2 As a lubricant, firstly, the round bar material pretreated in step 1 is deformed in the upper equal radial angle parallel extrusion channel ...

Embodiment 2

[0036] Apply the mold for preparing ultra-fine crystal block materials proposed by the present invention, determine the inner angle Φ=90° and outer angle Ψ=30° of the extrusion channel (8) of the mold, and use a 30-ton press.

[0037] Step 1, pretreatment: first select the extrusion material to be the metal block material aluminum alloy 5052 that cannot be strengthened by heat treatment, and then process the metal block material aluminum alloy 5052 into a round bar φ10mm×60mm, and then proceed to improve the round bar Annealing pretreatment for plastic forming ability; the specific process conditions can be checked through the aluminum alloy heat treatment manual: 300 ° C for 180 minutes to remove the processing stress;

[0038] Step 2, rotating channel equiradial parallel extrusion: MoS 2 As a lubricant, firstly, the round bar material pretreated in step 1 is deformed in the upper equal radial angle parallel extrusion channel (I) section of the extrusion channel (8) for an eq...

Embodiment 3

[0040] Apply the mold for preparing ultra-fine crystal block materials proposed by the present invention, determine the inner angle Φ=90° and outer angle Ψ=30° of the extrusion channel (8) of the mold, and use a 30-ton press.

[0041] Step 1, pretreatment: first select the extrusion material to be stainless steel metal block material 302 that cannot be strengthened by heat treatment, and then process the stainless steel 302 metal block material into a round bar φ10mm×60mm, and then proceed to improve the plastic forming of the round bar The annealing pretreatment of the ability; the specific process conditions can be checked through the aluminum alloy heat treatment manual: 650 ° C for 180 minutes, and the processing stress is removed;

[0042] Step 2, rotating channel equiradial parallel extrusion: MoS 2 As a lubricant, first, the round bar material obtained through the pretreatment of step 1 is deformed in the upper equal radial angle parallel extrusion channel (I) section o...

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Abstract

The invention relates to a mold and a method for preparing ultrafine-grained bulk materials. The mold is characterized by that a concave mold consists of a front mold and a rear mold, wherein the cavities of the front mold and the rear mold are oppositely arranged and combined to form a complete extrusion channel which is a rotating channel between an upper equal-channel-angular parallel extrusion channel and a lower equal-channel-angular parallel extrusion channel, with an internal angle of phi and an external angle of psi; the cross section of the rotating channel gradually changes from a circular section, then to an elliptical section and finally to the circular section, the area of all the sections in the rotating channel keeps unchanged, and the equal-channel-angular parallel extrusion channels are vertical to an external rod feeding hole form in the upper end surface of the mold; the concave mold is fastened on a mold base which is fixedly connected with a workbench of an external press, and a punching head is positioned over the cavity of the concave mold and pressed into the cavity of the concave mold by being applied with load by the external press. The mold and the method can prepare the metal bulk material with an ultrafine-grained structure by achieving uniform and large plastic dependent variable during a single pass of loading extrusion.

Description

technical field [0001] The invention belongs to the technical field of metal pressure equipment processing, and in particular relates to a mold and a method for preparing ultrafine crystal block materials. Background technique [0002] With the rapid development of high-speed rail transit, MEMS, medicine, optics and aerospace technology, high-tech precision forgings, superplastic forming parts, biomedical materials, high-tech aerospace equipment, etc. Strength, high-strength and toughness materials put forward an urgent demand, and metal materials are required to exhibit excellent physical, mechanical and formability properties that are different from traditional metal parts. The grain size of ultrafine grain (UFG) materials is 1nm-100nm (nanoscale) and 100nm-1μm (submicron scale), with excellent physical, mechanical and forming properties, such as superplasticity, high strength, high toughness, high Magnetic permeability etc. Especially when high specific strength and hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02
Inventor 何敏李清伟杨峰郭华峰张宁胡志强王晓溪
Owner XUZHOU UNIV OF TECH
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