Hot Texture Rolling of Aluminum Sheet for Surface Defect Remediation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for rolling aluminum sheets struggle to effectively transfer surface texture from texture rolls due to low reductions and cold worked properties, leading to surface defects like scratches and slivers, increased debris, and additional processing costs.
Innovation Solution
Rolling aluminum sheets at elevated temperatures between 121°C to 521°C (250°F to 970°F) using texture rolls with surface roughness ranging from 1 micrometer to 50 micrometers to transfer texture at lower roll forces, reducing defects and debris, and potentially eliminating additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If texture rolling is performed at ambient temperature with low reduction, then the process is simple and requires minimal energy, but the texture transfer efficiency is poor and surface defects remain
Solution Approach 1:
The patent applies parameter changes by heating the metal sheet to elevated temperatures (above recrystallization temperature) before texture rolling. This temperature parameter change reduces the metal's flow stress and increases plasticity, enabling effective texture transfer at low reduction levels while eliminating surface defects. The temperature modification fundamentally alters the material's deformation characteristics to achieve the desired surface texture.
2Manufacturing precision
If higher reduction is used to improve texture transfer, then texture transfer efficiency increases, but debris generation increases and sheet cleanliness deteriorates
Solution Approach 1:
The patent changes the temperature parameter to enable effective texture transfer at low reduction levels. By performing rolling at elevated temperatures where the metal exhibits lower flow stress and higher ductility, the process achieves superior texture transfer (60-90% efficiency) without the high reductions that would generate excessive debris and compromise sheet cleanliness.
3Manufacturing precision
If post cold rolling skin pass is added to improve surface texture, then texture can be applied, but process complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the heating and texture rolling operations into a single integrated process step. By heating the metal sheet and immediately performing texture rolling while the metal is in its softened state, the process eliminates the need for separate post-cold-rolling skin pass operations. This consolidation reduces process complexity and manufacturing cost while achieving superior surface texture quality.
4Manufacturing precision
If texture rolling is performed at ambient temperature, then energy consumption is low, but roll wear increases and texture transfer is insufficient
Solution Approach 1:
The patent changes the temperature parameter to elevated levels to reduce the metal's flow stress and increase plasticity. This parameter modification enables effective texture transfer at low reduction levels, significantly reducing roll wear. Although heating requires energy input, the overall energy consumption is optimized by avoiding the high forces and multiple passes that would be required at ambient temperature.
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
Enhances texture transfer, reduces roll wear, minimizes debris, and lowers processing costs by improving surface quality and reducing the number of rolling passes, while maintaining sheet cleanliness and reducing roll wear.
Implementation Method 1
rolling the metal sheet with a texture roll when the metal sheet is at a temperature at which the metal sheet exhibits reduced yield strength relative to a yield strength of the metal sheet at ambient temperature
Implementation Method 2
The texture roll exhibits a surface roughness in the range of 1 micrometer to 50 micrometers
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
An apparatus and method for rolling aluminum sheet uses a texture roll to roll the sheet while is it hot and has reduced yield strength. The texture rolling may be used to remediate defects in the sheet at a variety of stages in rolling, and may facilitate subsequent rolling stages.