6000-Series Aluminum Sheet Processing for Flanging and Roping Control
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Solution Overview
Problem
Existing 6000 series aluminum alloy sheets suffer from poor flanging performance and obvious roping defects, limiting their large-scale application in automobile manufacturing due to issues with stress concentrations and microcrack initiation from coarse intermetallic compounds.
Innovation Solution
A manufacturing method that includes homogenization, controlled hot and cold rolling, intermediate annealing, and pre-aging treatment to regulate the size and distribution of second phase particles, promoting recrystallization nucleation (PSN) and refining grain size, thereby reducing recrystallization texture components and improving formability and flanging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hot rolling and coiling processes are used, then production efficiency is maintained, but coarse intermetallic compounds form causing poor flanging performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the coiling temperature range (200-300°C) and hot rolling temperature (350-450°C) to optimize the formation and distribution of second phase particles, transforming the coarse intermetallic compounds problem into controlled fine precipitates that improve flanging performance while maintaining production efficiency
Solution Approach 2:
The patent implements preliminary action through pre-aging treatment before final rolling, which promotes the formation of fine second phase particles in advance. This preliminary precipitation hardening creates an optimal microstructure that prevents stress concentration and microcrack initiation during subsequent flanging operations
2Strength
If coarse second phase particles are present, then material strength is maintained, but stress concentrations occur causing microcrack initiation
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of second phase particles with specific size ranges (0.5-2.0 μm) throughout the matrix. This controlled local distribution ensures adequate strength while preventing the harmful stress concentration effects of coarse uniform particles, particularly at grain boundaries and inclusion interfaces
Solution Approach 2:
The patent converts the potentially harmful effect of second phase particles into a beneficial mechanism by controlling their size and distribution to induce beneficial precipitation hardening. The fine second phase particles act as dispersion strengthening agents that impede dislocation motion, improving strength while reducing stress concentration compared to coarse particles
3Ease of manufacture
If recrystallization texture components are high, then forming process is simplified, but roping defects occur on the surface
Solution Approach 1:
The patent applies periodic action through controlled cyclic heating and cooling during hot rolling and coiling processes. This periodic thermal treatment promotes dynamic recrystallization with controlled texture development, reducing strong cubic and Gaussian texture components that cause roping defects while maintaining formability through moderate texture strength
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
The method produces an aluminum alloy sheet with high formability, high flanging performance, and low roping defects, suitable for vehicle manufacturing with improved mechanical properties and surface quality.
Implementation Method 1
subjecting an ingot to a homogenization treatment, wherein the temperature of the homogenization treatment is 530~580 °C
Implementation Method 2
stimulate the recrystallization nucleation (PSN) effect in the subsequent solution pre-aging treatment
Implementation Method 3
the rolling-start temperature of hot finish rolling is controlled to be 400~480 °C, and the temperature of hot final rolling and coiling is controlled to be 250 °C or higher
Implementation Method 4
cold rolling: wherein the total deformation rate of cold rolling is controlled to be 50~85%
Implementation Method 5
the average size of Mg 2 Si precipitate phase in the obtained cold-rolled sheet is 1.3~1.7μm, and the areal density of Mg 2 Si precipitate phase is ≥ 55000 pieces/mm 2
Data Source
Figure 1
AI summary
Disclosed are a 6000-series aluminum alloy sheet having high formability, high flangability and few roping line defects, and a manufacturing method therefor. The sheet has an average grain size of 20-32 µm, a recrystallization texture density of 6.5-10.0, a cubic texture component content of less than or equal to 8%, and a Gaussian texture component content of less than or equal to 7%. The method comprises: (1) homogenizing a cast ingot, the temperature of homogenization being 530-580°C; (2) directly performing hot rough rolling, hot finish rolling, and hot final rolling and coiling on the homogenized cast ingot, controlling the initial rolling temperature of the hot finish rolling to be 400-480°C, and controlling the temperature of the hot final rolling and coiling to be above 250°C; (3) cold rolling: controlling the total deformation of the cold rolling to be 50-85%; (4) solution treatment; and (5) performing pre-aging treatment, and then performing air cooling, so as to obtain the 6000-series aluminum alloy sheet.