Riveted Metal Middle Frame Press-Fit Assembly
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Solution Overview
Problem
Conventional metal middle frame production methods are inefficient due to high material waste and tool loss during CNC finishing of stainless steel blanks, leading to increased manufacturing costs.
Innovation Solution
A riveted metal middle frame design where an aluminum alloy middle plate with a convex edge is press-fitted with a border frame made of harder metal materials, such as stainless steel or titanium, using slots and members connected end-to-end to reduce finishing work and waste, thereby improving production efficiency and lowering costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CNC finishing is performed on stainless steel blanks after blank forming, then the metal middle frame structure achieves wear resistance and high-end appearance, but material waste increases and production efficiency decreases
Solution Approach 1:
The metal middle frame is divided into two separate components: an aluminum alloy middle plate and a stainless steel border frame. This segmentation allows each component to be manufactured independently using optimized processes - the aluminum plate can be precision-formed with minimal waste, while the stainless steel frame is formed separately and then assembled, reducing overall material waste and improving production efficiency while maintaining high finish quality.
Solution Approach 2:
The invention combines aluminum alloy and stainless steel materials in a composite structure. The aluminum alloy middle plate provides lightweight properties and ease of forming, while the stainless steel border frame provides wear resistance and structural strength. This composite approach allows each material to be processed according to its optimal characteristics, improving overall production efficiency while maintaining manufacturing precision.
2Reliability
If CNC finishing is performed on stainless steel blanks, then the metal middle frame achieves wear resistance, but tool loss increases and manufacturing cost increases
Solution Approach 1:
By segmenting the structure into aluminum alloy middle plate and stainless steel border frame, the invention reduces the amount of stainless steel requiring CNC finishing. The aluminum plate constitutes the bulk of the component and can be processed more efficiently, while only the stainless steel frame requires wear-resistant finishing, thereby reducing tool loss and manufacturing cost while maintaining necessary wear resistance.
Solution Approach 2:
The stainless steel border frame is designed with localized reinforcement at critical wear areas, such as the inner side members where contact and friction occur. This localized quality enhancement provides wear resistance exactly where needed without requiring extensive CNC finishing of the entire component, reducing manufacturing cost and tool loss.
3Strength
If stainless steel blanks are used for the entire metal middle frame, then structural strength is achieved, but material waste and production cost increase
Solution Approach 1:
The invention uses a composite structure combining aluminum alloy and stainless steel. The aluminum alloy middle plate provides structural strength and rigidity, while the stainless steel border frame provides additional structural support and wear resistance. This composite approach achieves necessary structural strength with significantly reduced material waste compared to using solid stainless steel throughout, as the aluminum plate can be formed with minimal material removal.
Solution Approach 2:
The stainless steel is applied locally to the border frame and critical structural areas rather than throughout the entire component. This localized application maintains structural strength where needed while minimizing overall material usage, thereby reducing material waste and production cost.
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 press-fitting method enhances production efficiency by minimizing tool loss and waste, resulting in a cost-effective manufacturing process for metal middle frames.
Implementation Method 1
the convex edge and the border frame are deformed by press-fitting the border frame to achieve a seamless connection between the convex edge and the slot
Data Source
AI summary
Provided is a riveted metal middle frame including a middle plate and a border frame riveted to the middle plate. The middle plate is made of aluminum alloy, and the periphery of the middle plate is convexly provided with convex edge. The border frame includes members connected end to end in sequence. The members are made of metal material with hardness not less than aluminum alloy, and are riveted to the periphery of the middle plate; and the inner sides of the members are respectively provided with slots for connecting the convex edge. The convex edge is riveted to the slot by press-fitting the border frame. Meanwhile, an electronic device including the above-described riveted metal middle frame is also provided. The beneficial effects are that the middle plate and the border frame are riveted together by press-fitting deformation, thereby improving production efficiency and reducing manufacturing cost.