Magnesium Cover Surface Finishing for Metallic Texture and Low Weight
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Solution Overview
Problem
Conventional electronic device cover members made of high specific gravity materials like aluminum are cumbersome due to weight, while those made of low specific gravity materials like magnesium struggle to express a metallic texture and are limited to simple patterns.
Innovation Solution
A method of manufacturing a cover member for electronic devices using magnesium, involving processes such as shaping, primary CNC machining, pretreatment, surface treatment, secondary CNC machining, and additional surface treatments to achieve a lightweight, aesthetically pleasing design with various patterns and colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cover member made of high specific gravity material (e.g., aluminum) is used, then the electronic device is protected from external impact and has durability, but the electronic device becomes cumbersome to carry due to its weight
Solution Approach 1:
The patent changes the material parameter from high specific gravity (aluminum) to low specific gravity (magnesium), achieving weight reduction while maintaining durability through advanced surface treatments (pretreatment and painting processes) that protect the magnesium material from corrosion and damage
2Weight of moving object
If a cover member made of low specific gravity material (e.g., magnesium) is used, then the weight of the electronic device is reduced, but it is impossible to express outward a metallic texture due to pretreatment and painting processes for preventing corrosion
Solution Approach 1:
The patent changes the surface treatment parameters by developing improved pretreatment and painting processes specifically tailored for magnesium material, enabling the expression of metallic texture and various patterns (hairline, sandblast patterns) while maintaining the weight advantage of magnesium
Solution Approach 2:
The patent applies surface treatments that copy or replicate the appearance characteristics of traditional metallic surfaces (aluminum) on magnesium material, achieving the desired metallic texture and patterns without compromising the weight benefits
3Reliability
If conventional pretreatment and painting processes are used on magnesium plate, then corrosion prevention is achieved, but various patterns and colors cannot be expressed
Solution Approach 1:
The patent modifies the pretreatment and painting process parameters to enable both corrosion prevention and the expression of various patterns and colors on magnesium surfaces, achieving multi-functionality in the surface treatment system
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 lightweight electronic device with an aesthetically pleasing metallic texture and various patterns, enhancing user convenience and design aesthetics while maintaining durability and chemical resistance.
Implementation Method 1
a process of performing primary Computer Numerical Control (CNC) machining on the magnesium plate using a predetermined cutting oil, a process of performing a primary pretreatment on the magnesium plate using chromate or micro arc oxidation (MAO)
Implementation Method 2
a process of performing secondary CNC machining on one region of the magnesium plate using a cutting oil containing alcohol, a process of performing a secondary pretreatment to prevent oxidation in the one region
Implementation Method 3
a painted layer disposed on one surface of the coating layer and formed by anionic electrodeposition painting using a material including an acrylic resin and an organic pigment
Data Source
AI summary
A method for manufacturing a cover member for electronic devices according to certain embodiments of the present disclosure may comprise: a step for forming a magnesium plate; a step for performing primary CNC processing on the magnesium plate using a predetermined cutting oil; a step for performing a primary pretreatment on the magnesium plate using chromate or micro arc oxidation (MAO); a step for performing a primary surface-treatment on the magnesium plate by bake-coating or electrodeposition coating; a step for performing secondary CNC processing on a first region of the magnesium plate using an alcohol-containing cutting oil; a washing and drying step; a step for performing a secondary pretreatment for preventing oxidation on the first region; and a step for performing a secondary surface-treatment on the first region by bake-coating or electrodeposition coating.