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Large-strain mold integrating extrusion with C-mode equal channel angular pressing shear deformation

A technology of equal channel angle and shear deformation, applied in the field of large-strain deformation processing molds, can solve the problems of difficult to achieve industrialized production, inability to continuous production, change the properties of metal materials, and achieve the effect of convenient maintenance of molds

Active Publication Date: 2017-11-07
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to design a mold capable of continuous production and obtain materials with uniform structure and large strain in order to solve the problem that the existing equal-channel angular extrusion processing technology cannot be continuously produced and it is difficult to realize industrialized production and obtain a larger strain. In order to achieve integrated extrusion and ECAP two-pass processing, it can greatly change the structure of materials and improve the performance of metal materials, and provide the necessary equipment for industrialized production

Method used

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  • Large-strain mold integrating extrusion with C-mode equal channel angular pressing shear deformation
  • Large-strain mold integrating extrusion with C-mode equal channel angular pressing shear deformation
  • Large-strain mold integrating extrusion with C-mode equal channel angular pressing shear deformation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Example 1: When the extrusion ratio is equal to 4, L7 / L1=1; L2 / D1=0.5; L3 / D2=2 (L3 / D1=0.9); L4 / D2=0.75; L5 / D2=1.9, L6 / D2=0.2; Inner intersection angle Φ=110°, transition outer fillet ψ=60°. The downward speed of the punch during simulation is 3mm / s, and the initial temperature during processing is 400°C. In this case, the Von mises value of the equivalent strain becomes abnormally large. And the workpiece stops moving after being squeezed partly, that is, the frictional force and driving force on the workpiece are balanced. Therefore, the mold core under this parameter cannot smoothly extrude the processed 7075 aluminum alloy.

example 2

[0032] Example 2: When the extrusion ratio is equal to 4, L7 / L1=0.75; L2 / D1=0.5; L3 / D2=2 (L3 / D1=1); L4 / D2=0.75; L5 / D2=1.9, L6 / D2=0.2; Inner intersection angle Φ=120°, transition outer fillet ψ=60°. The downward speed of the punch during simulation is 3mm / s, and the initial temperature during processing is 400°C. In this case, the material stops moving down after being extruded for a period of time, that is, the friction force is equal to the driving force, and the workpiece cannot be extruded smoothly. Therefore, the mold core under this parameter cannot smoothly extrude the processed 7075 aluminum alloy.

example 3

[0033] Example 3: Similar to Example 2, the difference is that the inscribed angle Φ is changed to 135°. The downward speed of the punch during simulation is 3mm / s, and the initial temperature during processing is 400°C. In this case, according to the force diagram, it can be seen that there is a jump in the force during the extrusion process, and the extrusion ends smoothly, which is the same as the theoretical drop value of the punch in the Deform simulation of 52mm. However, the equivalent strain Von Mises becomes abnormally large, and the surface of the machined parts has defects, which indicates that the parameters of the mold cavity are unreasonable. Therefore, the mold core under this parameter also cannot smoothly extrude the processed 7075 aluminum alloy.

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Abstract

The invention discloses a large-strain mold integrating extrusion with C-mode equal channel angular pressing shear deformation. The large-strain mold comprises an upper mold base (7), a male mold fixing plate (9), a guiding rod (5), a male mold (10), a guiding sleeve (4), a front mold core (12), a back mold core (16), a female mold sleeve (13), a cushion block (14) and a lower mold base (2). The large-strain mold is characterized in that a cavity formed in the front mold core (12) and a cavity formed in the back mold core (16) are each composed of four portions, wherein each first portion is a segment of a cylinder, each second portion is a tapered variable-diameter hole, each third portion is composed of three segments of cylindrical equal channels intersecting with one another in sequence, the internal intersection angle formed through intersection of three segments of circular arcs is phi, and each fourth portion is a cylinder convenient for material mold stripping. According to the large-strain mold, the advantages of an extrusion technology and the advantages of an equal channel angular pressing technology are integrated, and efficient, continuous and steady surface levelling and uniform large-strain deformation machining having a high regulating function on crystal orientation can be conducted on a metal material.

Description

technical field [0001] The invention relates to a processing die for large strain deformation of metal materials, especially a processing die for changing the structure and performance of profiles through integrated extrusion and equal channel angular extrusion shear deformation, specifically a processing die based on extrusion and extrusion Equal channel angular extrusion shear deformation obtains a large-strain processing die that can process large materials continuously and obtain high-performance materials. Background technique [0002] Extrusion technology is one of the technologies to achieve high-efficiency and large-strain processing in China, and it has been widely used in my country's metal material manufacturing industry. This technology has the characteristics of continuous production and three-dimensional compressive stress, and can effectively compress defects such as loose materials and pores, but it has the characteristics of small shear strain, single deform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02
Inventor 许晓静刘志刚童浩张晓宇蔡成彬黄锦栋居士浩张可人丁清汪成松
Owner JIANGSU UNIV
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