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Stepping continuous extrusion device and method for metal severe plastic deformation

A technology of plastic deformation and extrusion equipment, applied in the direction of metal extrusion dies, etc., to achieve the effects of eliminating tissue defects, eliminating large lengths, and eliminating large deformation loads

Active Publication Date: 2013-10-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the preparation of ultra-fine grains by existing severe plastic deformation methods, the present invention provides a step-by-step continuous extrusion device and method for severe plastic deformation of metals. Continuous extrusion, producing ultra-fine-grained metal rods / strips with different cross-sectional shapes and sizes and severely plastically deformed metal rods / strips, etc., to overcome the existing SPD method and achieve continuous production when preparing large-scale ultra-fine-grained metal parts Deficiencies in severe plastic deformation

Method used

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  • Stepping continuous extrusion device and method for metal severe plastic deformation
  • Stepping continuous extrusion device and method for metal severe plastic deformation
  • Stepping continuous extrusion device and method for metal severe plastic deformation

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Step-by-step continuous extrusion devices for severe plastic deformation of metals such as figure 1 As shown, it includes the mold part and the fixture part; the fixture part is composed of the upper fixture 2, the lower fixture 3, the fixture seat 6, the fixing plate 8 and the spring 7, the upper fixture 2 and the lower fixture 3 are wedge-shaped fixtures, the upper and lower fixtures The space between constitutes the channel of the deformed part; wherein the height of the outlet end of the upper clamp 2 is greater than the height of the inlet end, and the height of the outlet end of the lower clamp 3 is greater than the height of the inlet end; Sliding connection, a fixing plate 8 is installed on the fixture seat 6, and the fixing plate 8 is located on the side of the outlet end of the deformation member channel, and two springs 7 are also fixed on the fixing plate 8 to connect with the upper fixture 2 and the lower fixture 3 respectively;

[0053] The mold part is co...

Embodiment 2

[0107] The structure of the step-by-step continuous extrusion device for severe plastic deformation of metals is as follows: figure 2 As shown, the mold driving device is a hydraulic driving device, which mainly includes a hydraulic cylinder 24 and a piston 23; the mold is a 120° channel mold 21, the mold seat is a 120° channel mold seat 22, and the piston 23 and the 120° channel mold seat 22 are fixed together , the angle between the axis of the front passage of the corner passage and the axis of the rear passage is 120o; the length of the front passage is 20mm; the rest are the same as in embodiment 1;

[0108] The semi-continuous casting 6061 aluminum alloy is used as the deformed part, the size is 5 mm × 30 mm × 100 mm, the structure is a rose-shaped grain structure, and the average grain size is 150 μm; the method of extrusion deformation is the same as that of Example 1, the difference is: ( 1) Set the height of the channel of the deformed part to be 99% of the thicknes...

Embodiment 3

[0112] The structure of the step-by-step continuous extrusion device for severe plastic deformation of metal is the same as that of Embodiment 1, except that the angle between the slope outside the fixture and the channel axis of the deformed part is 11o;

[0113] Pure aluminum is used as the deformed part, the size is 5mm × 50mm × 380mm, and the average grain size is 120μm; the method of extrusion deformation is the same as that of Example 1, the difference is: (1) the height of the channel of the deformed part is set to be the thickness of the deformed part 97%; (2) After 8 times of extrusion deformation, the deformed part obtained ultra-fine-grained aluminum with an average grain size of 255nm; annealing at 160°C for 6 minutes stabilized the microstructure; (3) The deformation of the deformed part during extrusion deformation The maximum deformation load is 18.2T, the deformation amount in a single pass is 0.9, and the deformation rate is 14.4s -1 ;

[0114] The deformatio...

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Abstract

The invention provides a stepping continuous extrusion device and method for metal severe plastic deformation. The device comprises a die part and a clamp part, wherein the clamp part comprises an upper clamp, a lower clamp, a clamp seat, a fixing plate and springs, the inclined planes on the outer sides of both the upper clamp and the lower clamp are connected with the inclined plane in the clamp seat, the fixing plate is mounted on the clamp seat, and the springs are fixed on the fixing plate and used for being connected with the upper clamp and the lower clamp respectively; the die part consists of a die, a die base and a die driving device, and the die is fixed on the die base connected with the die driving device. The method comprises the following steps: transmitting metal bar / plate strips to a deformable part channel as deformable parts through feeding rollers, and starting up the die driving device to enable the die to reciprocate so as to realize stepping continuous extrusion deformation of metal. By adopting the method, long superfine grained materials and materials subject to severe plastic deformation can be prepared, and the deformation load is reduced. The method has the advantages of simple process, energy saving, material saving and the like.

Description

technical field [0001] The invention relates to a device and a method for severely plastically deforming metal rods / plates and strips, in particular to a step-by-step continuous extrusion device and method for severely plastically deforming metal. Background technique [0002] The strengthening and toughening control of metal materials has always been a technology of concern in the field of materials. Among the common strengthening methods, only fine-grain strengthening is a method that can simultaneously increase strength and improve plasticity and toughness. In recent years, research on the preparation technology, microstructure and properties of submicrocrystalline (greater than 100nm) and nanocrystalline (less than 100nm) materials with a grain size of less than 1 μm has attracted great attention from scholars at home and abroad. In the early 1980s, Gleiter et al. used the inert gas condensation method to obtain nanoparticles, and prepared metal nanocrystals such as Pd, ...

Claims

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Application Information

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IPC IPC(8): B21C23/04B21C25/02
Inventor 周志敏
Owner NORTHEASTERN UNIV
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