Roll-Bonded Stainless Steel-Aluminum Laminate for Press Workability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional roll-bonded laminates, particularly those of stainless steel and aluminum, face challenges in drawing workability despite sufficient bending workability, and adhesion issues between titanium and aluminum layers affect their performance and handling during production.
Innovation Solution
The development of roll-bonded laminates with enhanced adhesion between stainless steel and aluminum layers by incorporating additive metal elements like Mg, Mn, and Cu in the aluminum alloy, and specific processing methods such as sputter etching and annealing, to achieve higher peel strength and improved drawing workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cold rolling bonding is used to produce stainless steel/aluminum laminate, then bonding is achieved, but processing strain increases excessively, hardness increases excessively, and elongation becomes insufficient
Solution Approach 1:
The invention changes the temperature parameter from cold rolling (room temperature) to warm rolling (100°C to 300°C), which fundamentally alters the material behavior during bonding. This temperature parameter change allows achieving bonding strength while maintaining press workability, as the warm temperature reduces the stainless steel's hardness increase and maintains its elongation capability.
Solution Approach 2:
The invention introduces dynamic control of processing parameters including temperature (100-300°C), reduction ratio (5-20%), and rolling speed. By dynamically adjusting these parameters during the warm rolling process, the invention optimizes both bonding strength and press workability, preventing excessive hardness increase while ensuring adequate elongation.
2Strength
If warm rolling bonding is used to produce stainless steel/aluminum laminate, then bonding is achieved, but aluminum is difficult to handle and is easily deformed, causing thickness reduction and deteriorated workability
Solution Approach 1:
The invention optimizes the temperature parameter within a specific range (100°C to 300°C) where the aluminum remains manageable. This temperature range is high enough to facilitate bonding but low enough to prevent excessive aluminum deformation. Additionally, the reduction ratio is controlled within 5-20% to maintain thickness uniformity.
Solution Approach 2:
The invention applies preliminary surface treatment to both stainless steel and aluminum surfaces before warm rolling bonding. This preliminary action includes surface cleaning and activation, which enhances bonding without requiring excessive pressure or temperature that would deform the aluminum. The surface preparation allows bonding to occur with minimal deformation.
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 resulting laminates exhibit improved press workability, higher peel strength, and enhanced handling during production, making them suitable for applications like electronic device housings without fracturing or wrinkling.
Implementation Method 1
enhanced adhesion force between stainless steel and aluminum of a roll-bonded laminate
Implementation Method 2
surfaces to be bonded are activated by sputter etching
Implementation Method 3
performing batch annealing at 200° C. to 370° C. or continuous annealing at 300° C. to 800° C.
Data Source
AI summary
This invention provides a roll-bonded laminate that is excellent in press workability and/or a roll-bonded laminate with improved performance and ease of handling at the time of production. More specifically, this invention relates to a roll-bonded laminate composed of a stainless steel layer and an aluminum alloy layer with the peel strength of 60 N/20 mm or higher, a roll-bonded laminate composed of a stainless steel layer and a pure aluminum layer with the peel strength of 160 N/20 mm or higher, and a roll-bonded laminate composed of a pure titanium or titanium alloy layer and an aluminum alloy layer with the peel strength of 40 N/20 mm or higher.