Isogrid Casing Casting via Fan-Shaped Groove
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Solution Overview
Problem
Conventional isogrid structures formed by cutting are costly and difficult to apply to general-purpose electronic apparatuses, and casting methods result in insufficient fluidity of molten metal, leading to poor filling reliability and high molding defect rates.
Innovation Solution
An isogrid structure is formed by casting with a modified mold design where the inner periphery of the annular groove is a fan shape, allowing for improved fluidity and reduced pressure resistance, enabling the formation of a casing with increased rigidity and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cutting methods are used to form isogrid structure, then manufacturing precision and structural rigidity are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent replaces the mechanical cutting process with a casting process to form the isogrid structure. Instead of cutting ribs from a solid block or sheet, the ribs are directly formed through mold casting, substituting a complex mechanical machining system with a simpler formative process that achieves the same structural outcome with lower cost and complexity
Solution Approach 2:
The patent modifies the mold design parameters, specifically making the inner periphery of the annular groove fan-shaped rather than circular, to optimize molten metal flow characteristics during casting. This parameter change enables the casting process to successfully produce the isogrid structure with appropriate rigidity, resolving the contradiction between manufacturing method and structural performance
2Ease of manufacture
If conventional casting methods are used to form isogrid structure, then manufacturing cost is reduced, but filling reliability deteriorates due to insufficient fluidity of molten metal
Solution Approach 1:
The patent changes the geometric parameters of the mold, specifically designing the inner periphery of the annular groove with a fan shape instead of a circular shape. This parameter modification optimizes the flow path of molten metal, improving fluidity and ensuring complete filling of the isogrid structure during casting, thereby achieving both cost reduction and filling reliability
Solution Approach 2:
The patent applies curved geometry to the mold design by making the inner periphery of the annular groove fan-shaped. This curvature design facilitates smoother flow of molten metal compared to straight or angular configurations, improving filling reliability while maintaining the cost-effective casting process
3Ease of manufacture
If conventional casting methods are used to form isogrid structure, then manufacturing cost is reduced, but molding precision deteriorates due to high molding defect rate
Solution Approach 1:
The patent modifies the mold geometry parameters, specifically designing the inner periphery of the annular groove with a fan shape, to optimize casting flow characteristics. This parameter change reduces turbulence and improves metal distribution, thereby reducing molding defects and improving manufacturing precision while maintaining the low-cost casting process
Solution Approach 2:
The curved fan-shaped design of the annular groove inner periphery promotes smoother molten metal flow and more uniform filling patterns, reducing common casting defects such as air entrapment and incomplete filling, thereby improving molding precision without increasing manufacturing cost
Data Source
AI summary
In a casing for an electronic apparatus, a plurality of ribs are integrally formed on an inner surface of the casing, and the plurality of ribs form an isogrid structure in which a plurality of equilateral-triangular segments are arranged regularly adjacent to each other.