Anti-deformation high-precision ultra-thin aluminum alloy profile and preparation method thereof

By employing specific chemical compositions and processes, including two-stage homogenization, variable-speed extrusion, and gradient cooling, combined with nano-ceramic coatings, the problems of dimensional accuracy and performance instability in the preparation of ultra-thin aluminum alloy profiles have been solved, enabling the production of high-precision and high-strength ultra-thin aluminum alloy profiles.

CN122303699APending Publication Date: 2026-06-30JIANGSU WEIYE ALUMINUM MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU WEIYE ALUMINUM MATERIAL
Filing Date
2026-04-24
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies for preparing ultra-thin aluminum alloy profiles with a wall thickness of ≤0.8mm suffer from problems such as insufficient dimensional accuracy, uncontrolled deformation, and large performance fluctuations. In particular, it is difficult to control the deformation and residual stress caused by uneven metal flow rate and temperature gradient during homogenization and online quenching processes.

Method used

By using aluminum alloy materials with specific chemical compositions, combined with two-stage homogenization treatment, variable speed extrusion strategy, gradient temperature control extrusion and three-stage gradient cooling system, as well as surface inorganic nano-ceramic coating, Al3Zr dispersed phase particles are formed by trace Zr elements to suppress dynamic recrystallization at grain boundaries. With the help of damping flow guide mold and movable air nozzle to regulate the flow of cooling medium, high-precision and high-strength ultra-thin aluminum alloy profiles can be prepared.

Benefits of technology

It achieves high precision and high strength in ultra-thin aluminum alloy profiles, with tensile strength exceeding 310MPa, elongation not less than 10%, profile tolerance controlled within 0.05mm, residual stress not exceeding ±20MPa, and yield increased to over 85%, significantly improving production quality and efficiency.

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Abstract

This invention discloses a high-precision, deformation-resistant ultrathin aluminum alloy profile and its preparation method, belonging to the field of aluminum alloy material processing technology. Addressing the problems of insufficient dimensional accuracy, large quenching deformation, and high residual stress in existing ultrathin aluminum profiles when the wall thickness is reduced to below 0.8 mm, the ultrathin aluminum profile provided by this invention has a thin-walled region with a wall thickness of 0.6 mm to 0.8 mm and a width-to-thickness ratio of not less than 10:1. The chemical composition, by mass percentage, includes 0.85% to 1.05% magnesium, 0.55% to 0.75% silicon, 0.15% to 0.35% copper, 0.10% to 0.25% manganese, 0.05% to 0.15% chromium, 0.08% to 0.12% zirconium, 0.01% to 0.03% titanium, ≤0.20% iron, and other impurities, individually ≤0.05% and in total ≤0.15%, with the balance being aluminum. The preparation method includes two-stage homogenization, gradient temperature-controlled extrusion, three-stage gradient cooling quenching, and pre-stretching low-temperature aging. This invention achieves synergistic control of high precision, high strength, and low residual stress in ultra-thin aluminum profiles.
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