Electronic Device Middle Frame Casting to Reduce Sand Holes
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Solution Overview
Problem
The middle frame of electronic devices formed through die casting has numerous sand holes, leading to poor quality and low strength, which compromises the overall strength and reliability of the electronic device.
Innovation Solution
The middle frame design includes a drainage material section located between the top and bottom surfaces of the middle plate region, with the runner outlet opposite to the mold cavity, allowing the casting liquid to flow parallel to these surfaces, reducing flow rate loss and maintaining a stable flow state, and incorporates machined surfaces and accommodation chambers for improved filling quality and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the runner outlet is positioned at the conventional location in the die casting mold, then the mold structure is simple, but the casting liquid experiences height difference and flow direction changes causing flow rate loss and sand holes
Solution Approach 1:
The runner outlet is repositioned from a conventional lateral position to a position on the thickness direction surface of the mold cavity. This dimensional change allows the casting liquid to flow directly into the mold cavity without overcoming height differences or changing flow direction, eliminating sand holes and improving filling quality while maintaining simple mold structure
Solution Approach 2:
A drainage material section is introduced as an intermediary component between the runner outlet and the mold cavity. This drainage material section facilitates direct flow of casting liquid from the runner outlet into the mold cavity, acting as a mediator that eliminates the need for complex flow path adjustments while improving filling quality
2Weight of moving object
If the middle plate region thickness is reduced for lightweight design, then the product weight decreases and battery accommodation space increases, but the filling quality deteriorates due to insufficient flow stability
Solution Approach 1:
By repositioning the runner outlet to the thickness direction surface, the casting liquid flows parallel to the top and bottom walls without height differences. This dimensional change in flow path enables stable filling even in thin-walled regions, allowing reduced middle plate thickness while maintaining filling quality
Solution Approach 2:
The flow parameters of the casting liquid are optimized by eliminating height differences and flow direction changes. This parameter change in flow stability allows the middle plate thickness to be reduced while maintaining adequate filling quality, achieving lightweight design without sacrificing manufacturing precision
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 design results in a middle frame with fewer sand holes, better quality, and higher strength, enabling a lightweight and efficient assembly with larger accommodation space for components like batteries, while maintaining stable flow during the casting process.
Implementation Method 1
at least a part of casting liquid does not flow in the thickness direction of the mold cavity after flowing out of the outlet of the runner, but directly flows into the first middle plate region mold cavity in a direction substantially parallel to the top wall and the bottom wall of the first middle plate region mold cavity
Data Source
AI summary
Embodiments of this application disclose a middle frame of an electronic device, a middle frame assembly, and an electronic device. The middle frame assembly includes a middle frame and a plastic part injection-molded on a surface of the middle frame. The middle frame includes a middle plate and a first accommodation chamber configured to accommodate a battery of the electronic device. There is a drainage material section on an outer side surface of the middle frame. The middle plate includes a first middle plate region for forming a bottom wall of the first accommodation chamber. The drainage material section is at least partially located between surfaces on which a top surface and a bottom surface of the first middle plate region are located.