Steel-Aluminum Cell Phone Frame Bonding via Surface Striations
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Solution Overview
Problem
Manufacturing steel-aluminum composite plates for cell phone frames faces challenges due to the significant differences in material properties, leading to low bonding strength between steel and aluminum, which affects the yield and production efficiency.
Innovation Solution
A cell phone frame is created using a composite plate with striations on its surface, where the first side surface of at least one plate is roughened and rolled with the second plate to form a strong bond, with a specific pitch and roughness that enhances bonding strength, and the plates are treated with a bending process and welding to achieve a higher shear strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional rolling process is used to manufacture steel-aluminum composite plate, then production efficiency is maintained, but bonding strength between steel and aluminum layers is insufficient
Solution Approach 1:
The patent applies preliminary action by roughening the surface of steel plates before rolling them with aluminum plates. The roughening process creates striations on the steel surface in advance, which significantly improves bonding strength when the aluminum is rolled onto the prepared surface. This preliminary surface treatment resolves the contradiction by enabling strong bonding without requiring excessive rolling pressure or multiple passes, thereby maintaining production efficiency.
Solution Approach 2:
The patent employs parameter changes by modifying the surface morphology of the steel plate through controlled roughening. The striations created have specific pitch ranges (0.005-0.03mm) and depth parameters that optimize the bonding interface. By changing the surface parameters (roughness, striation pitch, depth) before rolling, the bonding strength is enhanced while the rolling process itself remains efficient and production-friendly.
2Strength
If surface roughening is applied to improve bonding, then bonding strength increases, but manufacturing process complexity increases
Solution Approach 1:
The patent uses parameter changes by defining specific ranges for striation pitch (0.005-0.03mm) and depth that achieve optimal bonding. By establishing these precise parameters, the surface roughening process becomes controllable and repeatable, preventing it from becoming a complex trial-and-error procedure. The parameters are optimized to work effectively with standard rolling equipment.
Solution Approach 2:
The patent applies local quality by roughening only the specific surface area of the steel plate that will contact the aluminum plate during rolling. The roughening is localized to the bonding interface rather than treating the entire plate, which minimizes additional processing time and complexity while maximizing bonding improvement at the critical interface zone.
3Strength
If striation pitch is reduced to increase bonding area, then bonding strength improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes an optimized range for striation pitch (0.005-0.03mm) that balances bonding performance with manufacturability. This parameter range is wide enough to accommodate normal variations in the roughening process while still achieving superior bonding. The lower bound (0.005mm) provides fine detail for maximum bonding area, while the upper bound (0.03mm) allows for easier manufacturing control, creating a robust specification that is both high-performance and manufacturable.
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 results in a cell phone frame with improved bonding strength, ensuring a firmer structure and meeting the requirements of minimal signal shielding and low strength-to-weight ratio.
Implementation Method 1
the first side surface of the second plate and the first side surface of the first plate are rolled to connect
Implementation Method 2
the first side surface of at least one of the first plate and the second plate is provided with striations
Data Source
AI summary
A cell phone frame includes a composite plate, the composite plate encloses a accommodation space for accommodating the cell phone, the composite plate includes a first plate and a second plate, a first side surface of the first plate is provided with striations, the first side surface of the second plate and the first side surface of the first plate are rolled to connect, and the striations of which adjacent ones have a pitch of 0.005 mm to 0.03 mm account for more than 90% of all the striations. The first side surface of the first plate is roughened to form striations, which increases the area of the first plate and the second plate subjected to rolling, so that a composite plate produced by combining the first plate and the second plate has a higher bonding strength, thereby ensuring that the cell phone frame is firmer.