Ultra-Low Temperature Forming of Aluminum Alloy Shells
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Solution Overview
Problem
The existing methods for manufacturing high-strength aluminum alloy shells face challenges in achieving uniform microstructure and performance due to uneven deformation during the forming process, which can lead to insufficient hardening in some zones and over-aging in others, along with the risk of cracking.
Innovation Solution
A performance controlling method for high-strength aluminum alloy shells involves cooling the forming die and sheet to ultra-low temperatures, specifically below 150 K, to manage substructure density and deformation zones, ensuring uniform hardening and reducing the risk of cracking by optimizing the deformation distribution and using cold gases for localized cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the aluminum alloy is formed in an annealed state (soft state) before solution treatment, then the plasticity is improved and complex shell parts can be formed, but great shape distortion will be caused during subsequent quenching process
Solution Approach 1:
The patent applies preliminary deformation to the aluminum alloy sheet before solution treatment. By pre-deforming the material in its annealed state and then performing solution treatment, the patent achieves both good formability and minimal shape distortion during quenching, as the pre-deformed structure responds more uniformly to the heat treatment process
Solution Approach 2:
The patent changes the temperature parameter by cooling the aluminum alloy to ultra-low temperatures (below 150K) during the forming process. This parameter change modifies the deformation mechanism, allowing for better control of shape accuracy while maintaining formability through controlled plastic deformation at low temperatures
2Productivity
If the aluminum alloy shell is formed using stretch forming with gradual fitting to die, then large-sized shells with small curvature can be formed, but uneven deformation occurs leading to poor uniformity in microstructure and performance
Solution Approach 1:
The patent applies local quality by creating different deformation conditions in different zones of the aluminum alloy sheet. Through controlled cooling and localized deformation approaches, the patent ensures that each zone receives appropriate deformation treatment, preventing both insufficient hardening in low-deformation zones and over-aging in high-deformation zones
Solution Approach 2:
The patent introduces dynamics by using controllable, progressive deformation processes with adjustable parameters. The forming process can be dynamically adjusted to control the rate and distribution of deformation, ensuring uniform microstructure development throughout the shell while maintaining forming capability
3Strength
If deformation is increased in the small-deformation zone to improve hardening, then the strength of the small-deformation zone is improved, but this causes increase in deformation of the large-deformation zone or force transmission zone, leading to cracking
Solution Approach 1:
The patent changes the temperature parameter to ultra-low conditions (below 150K) which fundamentally alters the deformation mechanism. This parameter change allows for more uniform deformation distribution across all zones, achieving consistent hardening without concentrating excessive deformation in any single zone that would lead to cracking
Solution Approach 2:
The patent substitutes the conventional mechanical deformation approach with a thermomechanical approach by incorporating ultra-low temperature conditions. This substitution changes the material's response to deformation, enabling more uniform strain distribution and avoiding the cracking issues that arise from purely mechanical force application
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances the age-hardening effect, improves the uniformity of microstructure and performance, and prevents cracking by promoting substructure formation and controlled deformation, thereby addressing the issues of uneven deformation and performance variability.
Implementation Method 1
cooling the aluminum alloy sheet to below 150 K
Implementation Method 2
cooling a special-shaped forming die to an ultra-low temperature lower than 150 K
Implementation Method 3
stretching the aluminum alloy sheet until a curved part with a desired shape is formed
Implementation Method 4
a tension is applied by gripping jaws to make the sheet metal blank gradually fit to the die
Implementation Method 5
the aluminum alloy must go through solution and aging treatments to have a required high strength
Implementation Method 6
artificial aging
Data Source
AI summary
Provided is a performance controlling method for a high-strength aluminum alloy shell during an ultra-low temperature forming process. The present disclosure greatly improves the performance of an aluminum alloy sheet by applying an ultra-low temperature. The present disclosure cools the aluminum alloy sheet to an ultra-low temperature by using an ultra-low temperature cooling medium, so as to compensate for insufficient hardening caused by insufficient deformation and avoid cracking caused by increased deformation. The present disclosure cools the sheet blank zonally according to a deformation law of a desired curved part, and controls the ultra-low temperature distribution of the sheet blank during forming so as to promote the formation of a substructure in a small-deformation zone. In this way, the present disclosure improves a subsequent age-hardening effect, and corresponding uniformity of microstructure and performance, and effectively solves the problem of non-uniformity due to uneven deformation.