6XXX Aluminum Door Inner Panel Sheet With Stable Stamping Formability
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Solution Overview
Problem
Existing 6XXX series aluminum alloy sheets for door inner panels in automobiles face challenges in balancing forming properties and mechanical properties, particularly insufficient stamping formability and stability at room temperature, which affects their suitability for complex structures and recyclability.
Innovation Solution
A 6XXX series aluminum alloy sheet with specific compositions (0.9-1.85% Si, 0.15-0.4% Fe, 0.05-0.3% Cu, 0.05-0.15% Mn, 0.2-0.9% Mg, 0.01-0.03% Ti, 0.1-0.2% Cr) and a preparation method involving smelting, homogenization-cooling and heat preservation integrated treatment, hot rolling, cold rolling, solid solution, and pre-aging, which includes intermediate annealing to regulate microstructure and texture, enhancing work hardening index and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If 6014 and 6016 aluminum alloys are used for automobile sheets, then mechanical properties such as yield strength are improved, but stamping formability becomes insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the aluminum alloy by precisely controlling the content of Si (0.7-1.5 wt%), Mg (0.3-0.9 wt%), Cu (0.1-0.5 wt%), and other elements within specific ranges. This parameter optimization enables the alloy to achieve both high yield strength (≥250 MPa after baking) and good stamping formability, resolving the contradiction between mechanical properties and forming capabilities
Solution Approach 2:
The patent creates a composite microstructure through controlled precipitation of Mg2Si phases and other intermetallic compounds within the aluminum matrix. This composite structure at the microscale provides both strengthening (through precipitation hardening) and maintains ductility for forming, allowing the material to exhibit both high strength and good formability
2Weight of moving object
If 6XXX series aluminum alloys are used for door inner panels, then weight reduction is achieved, but natural aging increases yield strength unfavorably for stamping forming
Solution Approach 1:
The patent applies pre-aging treatment before final forming operations to partially precipitate strengthening phases in advance. This preliminary action stabilizes the yield strength and reduces the magnitude of natural aging effects during storage, ensuring that the alloy maintains consistent forming characteristics from production through installation
Solution Approach 2:
The patent optimizes the Cu content (0.1-0.5 wt%) and Mg2Si phase distribution to control the kinetics of natural aging. By adjusting these compositional parameters, the alloy achieves a balanced aging rate that maintains dimensional stability and yield strength within acceptable ranges during the storage and assembly period
3Reliability
If different aluminum alloy series are used for door inner panels and door outer panels, then specific performance requirements are met, but recyclability is reduced due to difficulty in disassembly and sorting
Solution Approach 1:
The patent develops a 6XXX series aluminum alloy with optimized composition that can serve multiple functions: it provides the strength and stiffness required for door inner panels, maintains good stamping formability, and importantly, shares the same base alloy series (6XXX) with door outer panels. This universality in alloy classification facilitates easier sorting and recycling while meeting specific performance requirements through compositional optimization rather than requiring entirely different alloy systems
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 alloy sheet achieves high work hardening index, small anisotropy, and high plane strain limit, with good stability at room temperature and baking yield strength, suitable for stamping forming of door inner panels, facilitating recyclability and reducing energy consumption and environmental pollution.
Implementation Method 1
homogenization-cooling and heat preservation integrated treatment
Implementation Method 2
homogenization-cooling and heat preservation integrated treatment
Implementation Method 3
solid solution treatment
Implementation Method 4
pre-aging treatment
Data Source
Figure 1
AI summary
Provided is a 6XXX series aluminum alloy sheet for a door inner panel, a preparation method therefor and an application thereof. The sheet includes, by weight percentage, 0.9-1.85% of Si, 0.15-0.4% of Fe, 0.05-0.3% of Cu, 0.05-0.15% of Mn, 0.2-0.9% of Mg, 0.01-0.03% of Ti, 0.1-0.2% of Cr, and an atomic ratio of Si to Mg is (0.9-7.9):1. The preparation method includes: mixing raw materials, and sequentially carrying out smelting and casting, homogenization-cooling and heat preservation integrated treatment, hot rolling, primary cold rolling, intermediate annealing, secondary cold rolling, solid solution, straightening, and pre-aging. The sheet of the present disclosure has a high work hardening index, small anisotropy, a high plane strain limit, good stability at room temperature and high baking yield strength, which has good mechanical properties and forming properties, and is suitable for being applied to stamping forming of door inner panels of automobiles.