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Friction extrusion method for preparing aluminium silicon alloy section bar

A technology of aluminum-silicon alloy and extrusion method, which is applied in the field of metal forming processing, can solve the problems of high equipment and mold requirements and difficult material forming, achieve low equipment and mold requirements, eliminate casting defects, and have a good silicon phase refinement effect Effect

Inactive Publication Date: 2009-12-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of plastic forming processing technology is that it is difficult to form materials and has high requirements for equipment and molds.

Method used

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  • Friction extrusion method for preparing aluminium silicon alloy section bar
  • Friction extrusion method for preparing aluminium silicon alloy section bar
  • Friction extrusion method for preparing aluminium silicon alloy section bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Friction extrusion processing of Al-30% Si alloy:

[0019] A. Manufacture a friction extrusion head with Φ4 eccentric hole;

[0020] B. The friction extrusion head rubs against the surface of the Al-30% Si alloy billet, and the friction relative speed reaches 530 revolutions per minute. At the same time, an extrusion force of 5 MPa is applied to extrude a Φ4 profile from the eccentric hole of the friction extrusion head, wherein The average diameter of silicon phase particles reaches 1.3 microns.

Embodiment 2

[0022] Friction extrusion processing of Al-12% Si alloy:

[0023] A. Manufacture a friction extrusion head with Φ4 eccentric hole;

[0024] B. The friction extrusion head rubs against the surface of the Al-12% Si alloy billet, and the friction relative speed reaches 530 revolutions per minute. At the same time, an extrusion force of 5 MPa is applied to extrude a Φ4 profile from the eccentric hole of the friction extrusion head, wherein The average diameter of silicon phase particles reaches 1.0 micron.

Embodiment 3

[0026] Friction extrusion processing of Al-6%Si alloy:

[0027] A. Manufacture a friction extrusion head with Φ4 eccentric hole;

[0028] B. The friction extrusion head rubs against the surface of the Al-6% Si alloy billet, and the friction relative speed reaches 530 revolutions per minute. At the same time, an extrusion force of 5 MPa is applied to extrude a Φ4 profile from the eccentric hole of the friction extrusion head, wherein The average diameter of silicon phase particles reaches 0.9 microns.

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Abstract

The invention relates to a method for preparing aluminium silicon alloy section bar, in particular to a friction extrusion method, belonging to the technical field of metal shaping and processing. The method adopts the following steps to shape: 1) an aluminium silicon alloy blank is filled in an aluminium silicon alloy blank jig with a concave cavity, and a friction extrusion head having an eccentric orifice deviating from the central line is arranged in the concave cavity; 2) the friction extrusion head rotates and applies pressure to the aluminium silicon alloy blank to cause the aluminium silicon alloy blank to rise temperature for plastification, and then, the aluminium silicon alloy blank is extruded out of the eccentric orifice of the friction extrusion head to form the section bar; 3) the temperature of the aluminium silicon alloy blank during friction extrusion does not exceed eutectic temperature thereof. The method can prepare aluminium silicon alloy section bar with average silicon-phase granule diameter being less than or equal to 10 micrometers, and the prepared aluminium silicon alloy section bar has no casting defects. In addition, the method has the advantages of simple technology, short flow, low requirement for equipment and the like, and has favourable application prospect.

Description

technical field [0001] The invention relates to a method for preparing aluminum-silicon alloy profiles, in particular to a friction extrusion method, which belongs to the technical field of metal forming processing. Background technique [0002] Aluminum-silicon alloy is the most important casting aluminum-based structural material, which has the advantages of high wear resistance and high temperature performance. However, there are usually acicular eutectic silicon phases and coarse plate-shaped primary silicon particles in the microstructure of cast aluminum-silicon alloys, which make the material's plasticity, toughness and fatigue strength low. At present, the technologies for refining and forming the silicon phase of cast aluminum-silicon alloy mainly include modification treatment (Q.C.Jiang, Materials Letters 59(2005): 624-628), rapid solidification (Li Yuanyuan, Trans.Nonferrous Met.Soc.China, Vol.12(5)(2000): 878-881), spray forming, etc. Modification treatment ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00
Inventor 卢德宏李慧平蒋业华周荣
Owner KUNMING UNIV OF SCI & TECH
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