A method of making a casting of a heat exchanger
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Solution Overview
Problem
Existing high pressure die casting technologies face challenges with soluble salt cores, including cracking, precise positioning issues, limitations in creating complex shapes, and inability to handle multiple alloy types and thin, long channels, which restrict their use in producing heat exchangers with intricate cavities and channels.
Innovation Solution
A casting method using an integrated core with both soluble and insoluble portions, where the soluble core is cast onto the surface of an insoluble metallic core, allowing for precise positioning and maintaining the insoluble core's structural integrity, enabling the creation of complex shapes and channels by dissolving the soluble portion to form cavities and channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If soluble salt cores are used in high pressure die casting, then cavities and channels can be formed in the casting, but the cores are prone to cracking under high pressure and temperature
Solution Approach 1:
The patent applies composite materials by combining soluble salt particles with a binder material to form an integrated core structure. The binder material provides structural support and crack resistance, while the soluble salt particles enable cavity formation. This composite approach resolves the contradiction by maintaining core integrity under high pressure while preserving the ability to form cavities.
Solution Approach 2:
The patent utilizes parameter changes by controlling the solubility characteristics of the salt particles and the binding properties of the binder material. The core is designed to maintain structural integrity during casting (insoluble state) and then dissolve after casting (soluble state). This parameter change resolves the contradiction between needing structural strength during processing and requiring dissolution for cavity formation.
2Shape
If soluble cores are used to create complex internal structures, then intricate cavities can be formed, but precise positioning of the cores in the mould is difficult
Solution Approach 1:
The patent applies local quality by giving different regions of the core different properties. The binder material provides structural support and positioning stability in critical areas, while the soluble salt particles are concentrated in regions where cavity formation is needed. This local differentiation resolves the contradiction by ensuring positioning accuracy where needed while maintaining cavity formation capability where required.
3Adaptability or versatility
If conventional soluble cores are used, then simple cavities can be formed, but complex shapes and thin long channels cannot be created
Solution Approach 1:
The composite structure of binder material and soluble salt particles enables the core to maintain structural integrity for complex shapes and thin channels during casting. The binder provides the necessary strength to support intricate geometries, while the soluble salt particles ensure complete dissolution to form the desired complex internal structures including thin long channels.
4Manufacturing precision
If soluble salt cores are used for heat exchanger casting, then cavities can be formed, but surface quality and mechanical performance are compromised
Solution Approach 1:
The patent utilizes parameter changes by controlling the dissolution timing and characteristics of the soluble salt particles. The core maintains its structural form during high-pressure die casting to ensure accurate cavity formation, then dissolves completely after casting to leave clean cavities. This parameter control resolves the contradiction by ensuring both accurate cavity formation and preservation of casting quality and mechanical performance.
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
This method reduces cracking, enhances positioning accuracy, allows for the creation of complex and thin, long channels, and enables the use of multiple aluminum alloys, resulting in improved surface quality and mechanical performance of heat exchanger castings.
Implementation Method 1
dissolving the soluble component with the solvent to form one or more cavity and/ or channels of the desired shape in the heat exchanger casting
Data Source
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AI summary
A casting method involves casting a metal heat exchanger by way of a high pressure die casting process on a core, the core having a salt component soluble to a water solvent and a metal component non-soluble to the solvent. The soluble salt core component is integrally cast on the surface of the metal core component to form a desired shape. During casting the insoluble core component and the soluble core component are directly in contact with molten metal and remain in place within the solidified metallic casting. The method further comprises dissolving the soluble portion of salt with the water solvent to form one or more cavities and/or channels of the desired shape in the heat exchanger casting.