Steel-Aluminum Cell Phone Frame Bonding with Surface Striations
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Solution Overview
Problem
The manufacturing of steel-aluminum composite plates for cell phone frames faces challenges due to the significant differences in material properties, leading to low bonding strength, 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 one plate is roughened to increase the bonding area, and the plates are rolled asynchronously to form a strong bond, followed by a bending and welding process to enhance the structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If steel and aluminum plates are rolled together to form a composite plate, then the composite plate combines high strength and good plasticity of steel with good electrical conductivity, thermal conductivity, corrosion resistance, and low density of aluminum, but the bonding strength is low due to the great difference in material properties between steel and aluminum
Solution Approach 1:
The surface of at least one plate is roughened before rolling to create striations that increase the bonding area. This preliminary surface treatment ensures that when the plates are rolled together, the increased surface area provides more contact points for bonding, thereby improving the overall bonding strength despite the inherent material property differences between steel and aluminum
Solution Approach 2:
The surface roughness parameter is changed by creating striations with specific pitch ranges (0.005mm to 0.03mm). This parameter modification transforms the smooth surface into a textured surface with increased area, which directly addresses the bonding strength issue by providing more surface area for the steel-aluminum interface to bond effectively
2Strength
If the surface is roughened to increase bonding area, then the bonding strength increases, but the manufacturing process complexity increases
Solution Approach 1:
Surface roughening is performed as a preliminary step before rolling, allowing the striations to be created in advance. This separates the surface treatment process from the rolling process, making each process more manageable and reducing the overall manufacturing complexity while still achieving the bonding strength improvement
Solution Approach 2:
The roughening is applied locally to the surface of the plate that will be bonded, creating striations only where needed for bonding. This localized treatment approach minimizes the impact on the overall manufacturing process while concentrating the complexity only where it provides the most benefit - at the bonding interface
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 higher bonding strength, ensuring a firmer structure and improved production efficiency by achieving a shear strength of 200-245 MPa, suitable for minimal signal shielding and low strength-to-weight ratio requirements.
Implementation Method 1
a first side surface of at least one of the first plate and the second 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
Data Source
AI summary
A cell phone frame, and a method for manufacturing the same, includes a composite plate. The composite plate encloses an 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 having 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.