Composite Metal Middle Frame Bezel for Higher Stiffness
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Solution Overview
Problem
The overall stiffness of electronic devices is weak due to a small metal proportion of the bezel in the middle frame.
Innovation Solution
The middle frame is designed with a bezel comprising at least two layers of annular structures made from different metal materials of varying densities, increasing the metal proportion and improving stiffness. The manufacturing method involves hot forging a composite plate with multiple metal layers to form the middle frame, which reduces deformation resistance and allows for a thicker semifinished part, further enhancing stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer metal bezel structure is used, then the manufacturing process is simple, but the metal proportion is small and overall stiffness is weak
Solution Approach 1:
The bezel is constructed as a composite structure with an inner metal layer and an outer metal layer made of different materials. The inner layer provides structural support and stiffness, while the outer layer provides appearance and protection. This composite structure increases the overall metal proportion and stiffness without requiring excessive thickness, resolving the contradiction between strength and device thinness.
Solution Approach 2:
The solution transitions from a single-layer planar structure to a multi-layer three-dimensional structure. By adding the outer metal layer surrounding the inner metal layer, the bezel gains enhanced stiffness and metal proportion while maintaining a controlled overall thickness, effectively resolving the contradiction between structural strength and device complexity.
2Strength
If the bezel thickness is increased to improve stiffness, then the metal proportion increases, but the device weight increases
Solution Approach 1:
The bezel uses a composite structure with an inner metal layer and an outer metal layer made of different materials with different densities. The inner layer uses a denser material for structural support, while the outer layer uses a lighter material to reduce weight. This allows the bezel to achieve sufficient stiffness with a reasonable thickness without excessive weight gain.
Solution Approach 2:
Different regions of the bezel are assigned different material properties. The inner layer, which requires higher strength and stiffness, uses a denser metal material. The outer layer, which is more visible and less critical for structural support, uses a lighter metal material. This local differentiation optimizes both stiffness and weight.
3Strength
If a multi-layer metal bezel structure is used, then the metal proportion and stiffness are improved, but the manufacturing complexity increases
Solution Approach 1:
The inner metal layer and outer metal layer are prepared as separate components before assembly. The inner layer is formed first, then the outer layer is formed and assembled around it. This preliminary preparation of separate layers simplifies the manufacturing process compared to attempting to form a complex multi-layer structure in a single operation, reducing overall manufacturing complexity while achieving the desired stiffness.
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 increased metal proportion and use of lightweight metals in strategic layers enhance the overall stiffness of the electronic device while reducing weight, achieving a balance between structural strength and weight reduction.
Implementation Method 1
hot forging a composite plate with multiple metal layers to form the middle frame, which reduces deformation resistance
Data Source
AI summary
An electronic device and a manufacturing method for a middle frame are provided. The electronic device includes a middle frame, and the middle frame includes a bezel and a middle plate. The bezel is of an annular structure and is disposed around an edge of the middle plate, and the bezel includes at least two layers of annular structures. A concavo-convex fit between any two adjacent annular structures in the at least two layers of annular structures is used to locate the annular structure. The at least two layers of annular structures are respectively at least two metal materials of different densities. In this application, in a processing manner of hot forging a composite plate, the bezel, the middle plate, and a rib in the middle frame are an integrated structure, and at least two types of metal are arranged on the bezel at the same time.