Vitreous Inserts in Metal Castings for Lightweight Wheel Sections
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Solution Overview
Problem
Current metal casting systems, particularly for complex geometric components like automobile wheels, face challenges in removing sand from cast parts and achieving weight reduction without compromising strength, as sand casting is not viable in all geometries and voids can create stress areas.
Innovation Solution
Incorporating vitreous insert members with a higher melting point than the casting metal, positioned in central portions of the wheel, filled with materials of different densities to create localized lower apparent density and retained in place using tapered ends and wire rods, allowing for reduced metal usage and weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If sand casting is used to create complex geometric components, then the casting can be formed with intricate geometries, but sand removal becomes difficult and may not be viable in all locations
Solution Approach 1:
The invention extracts the sand removal problem by using a coreless casting process where no sand is introduced into the final component. Instead of casting with sand and then removing it, the process creates the complex geometry directly without sand, eliminating the sand removal issue entirely for encapsulated areas.
Solution Approach 2:
The invention introduces a sacrificial insert member as an intermediary that temporarily occupies the space where sand would otherwise be present. This insert member is designed to be removed after casting, leaving the desired void or cavity without requiring sand to be present or removed from the final component.
2Weight of moving object
If voids are placed within a cast component to reduce weight and cost, then material usage decreases, but stress areas are created under loading
Solution Approach 1:
The invention applies local quality by placing voids or cavities only in specific locations where they will not compromise overall component strength. The sacrificial insert members are positioned in areas where their removal creates beneficial voids for weight reduction while maintaining structural integrity in critical load-bearing regions.
Solution Approach 2:
The invention uses composite materials by combining the metal casting with strategically placed voids or cavities in non-critical areas. This creates a composite structure that leverages the strength of the metal where needed and the weight-saving benefits of voids where appropriate, achieving an optimized strength-to-weight ratio.
3Weight of moving object
If insert members are used to create localized lower apparent density, then weight reduction is achieved, but the insert members must be retained in place without contaminating the metal
Solution Approach 1:
The invention applies preliminary action by designing the sacrificial insert members with features that ensure they remain securely in place during the casting process. The insert members are pre-positioned in the mold cavity and designed with retention mechanisms that prevent displacement or contamination before the metal is poured and during the casting process.
Solution Approach 2:
The invention uses disposable sacrificial insert members that are inexpensive and designed to be removed after casting. These insert members serve their purpose during manufacturing by creating the desired voids or cavities, and then they are discarded rather than being part of the final product, eliminating the need for complex retention mechanisms in the finished component.
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 solution enables efficient sand removal, reduces casting material mass and cost, maintains component strength, and utilizes waste materials for sustainability, while ensuring the insert members remain in place and do not contaminate the metal during casting.
Implementation Method 1
The insert member has a higher melting point than a melting point of the metal of the casting the insert member displaces
Data Source
AI summary
A casting system includes a casting for an automobile vehicle having an interior section. Multiple central portions are individually positioned in one of multiple areas of the interior section completely encapsulated by a metal of the casting. An insert member is positioned in individual ones of the multiple central portions, the insert member having a higher melting point than a melting point of a metal of the casting the insert member displaces.