Roll-Bonded Stainless Steel-Aluminum Laminate for Drawing Workability
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Solution Overview
Problem
Conventional roll-bonded laminates, particularly those of stainless steel and aluminum, face challenges in drawing workability despite sufficient bending workability, and those of titanium and aluminum suffer from inadequate adhesion force, leading to difficulties in press workability and handling during production.
Innovation Solution
A roll-bonded laminate composed of stainless steel and aluminum alloy layers with enhanced adhesion force, achieved through sputter etching and pressure bonding with specific reduction ratios, and subsequent annealing, to improve peel strength and drawing workability. Additionally, using pure aluminum and titanium alloys with specific additive elements to enhance adhesion and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cold rolling bonding is used to produce a roll-bonded laminate of stainless steel and aluminum, then the laminate can be produced with moderate processing, but the stainless steel experiences excessive hardness increase and insufficient elongation, making drawing work difficult
Solution Approach 1:
The patent applies warm rolling bonding at a specific temperature range (100°C to 200°C) to change the thermal parameter of the processing. This temperature increase reduces the hardness increase of stainless steel compared to cold rolling, while maintaining bonding effectiveness, thereby resolving the contradiction between processing ease and excessive hardness
2Ease of manufacture
If warm rolling bonding is used to produce a roll-bonded laminate of stainless steel and aluminum, then the bonding can be achieved, but aluminum is easily deformed and thickness uniformity is poor, deteriorating workability
Solution Approach 1:
The patent optimizes the warm rolling temperature to a specific range (100°C to 200°C) and controls the reduction ratio to prevent excessive aluminum deformation. This parameter optimization achieves effective bonding while maintaining thickness uniformity and workability, resolving the contradiction between bonding achievement and thickness precision
3Ease of manufacture
If conventional roll-bonded laminate of titanium and aluminum is used, then the laminate can be produced, but the adhesion force between layers is insufficient, deteriorating performance and handling
Solution Approach 1:
The patent applies warm rolling bonding at specific temperatures (100°C to 200°C) and controls the reduction ratio to enhance diffusion bonding between titanium and aluminum layers. This parameter optimization significantly improves interlayer adhesion force while maintaining production feasibility
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 solution significantly improves the press workability and handling of roll-bonded laminates by enhancing the adhesion force and drawing workability, allowing for the production of high-strength, high-elongation materials suitable for electronic device housings and other applications.
Implementation Method 1
surfaces to be bonded are activated by sputter etching
Implementation Method 2
subsequent annealing, to improve peel strength and drawing workability
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.