Additive Casting Molds Using Magnesium Chloride Binding
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Solution Overview
Problem
Existing additively manufactured casting molds for complex components are impractical due to high manufacturing costs, heavy weight, and limited reusability, often requiring complex and costly disposal after single-use, which is uneconomical and environmentally inefficient.
Innovation Solution
A method for producing additively manufactured casting molds using a mixture of powdered binding agents and aggregates, with a printing fluid of magnesium chloride or magnesium sulfate, applied in layers and set to form a strong, lightweight mold that can be reused by recalculating the binding agent, reducing waste and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sand is used as the main component of the casting mould, then the mould has high strength and stability, but the mould becomes very heavy and difficult to handle
Solution Approach 1:
The patent changes the chemical composition parameters of the binding agent from conventional synthetic resins to a mixture of magnesium oxide and magnesium chloride, which enables the binding agent to be water-soluble while maintaining adequate mould strength. This parameter change allows the mould to be dissolved easily in water after use, making it lightweight and easy to remove without requiring special lifting devices
Solution Approach 2:
The patent uses a composite material system consisting of sand particles bound together by a water-soluble binding agent (magnesium oxide and magnesium chloride). This composite structure provides the necessary strength during casting while allowing easy dissolution and removal afterward, resolving the contradiction between strength and weight/handling difficulty
2Strength
If conventional synthetic resins are used as binding agents, then the casting mould has adequate strength, but the manufacturing costs increase and the moulds become hazardous waste requiring complex disposal
Solution Approach 1:
The patent fundamentally changes the chemical nature of the binding agent from non-water-soluble synthetic resins to water-soluble magnesium oxide and magnesium chloride. This parameter change transforms the end-of-life behavior of the mould from hazardous waste requiring complex disposal to a material that can be easily dissolved in water, eliminating disposal costs and environmental hazards while maintaining adequate strength during use
Solution Approach 2:
The patent adopts a disposable mould concept using inexpensive, water-soluble binding agents that can be easily discarded by dissolving in water. This approach replaces expensive, reusable synthetic resin-based moulds with cheap, single-use alternatives that simplify the entire lifecycle from manufacturing to disposal, reducing both costs and environmental impact
3Ease of manufacture
If water-soluble binding agents are used in powder-based layering processes, then the mould can be dissolved after use, but the mould strength is low (0.8-1.5 N/mm2) and requires lengthy oven treatment to enhance strength
Solution Approach 1:
The patent optimizes the particle size distribution of the sand and binding agent mixture, controls the moisture content, and adjusts the binding agent composition to achieve adequate mould strength (comparable to conventional methods) while maintaining water-solubility. These parameter changes eliminate the need for lengthy oven treatment while preserving the dissolvability advantage
Solution Approach 2:
The patent uses an excessive amount of water-soluble binding agent relative to conventional methods, ensuring that the mould has sufficient strength during casting while maintaining complete water-solubility. This partial or excessive action with the binding agent resolves the contradiction between achieving adequate strength and maintaining easy dissolvability without requiring additional heat treatment
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 method enables the production of lightweight, strong, and cost-effective casting molds that can be reused multiple times, reducing waste and operational costs, while maintaining high precision and strength, thus addressing the limitations of prior art in the construction and boat-building industries.
Implementation Method 1
providing a printing fluid comprising an aqueous solution of magnesium chloride or magnesium sulfate... allowing those parts of the mixture to set which have been mixed with the aqueous solution
Data Source
AI summary
A method of producing an additively manufactured casting mould for the production of components using the cold casting process or lamination process, comprising the steps ofa) determining a three-dimensional structure of the casting mould,b) providing a mixture, the mixture comprising a binding agent and an aggregate,c) providing a printing fluid comprising an aqueous solution of magnesium chloride or magnesium sulfate,d) applying a layer of the mixture to a support,e) applying the printing fluid only to those parts of the mixture which are supposed to constitute a part of the casting mould,f) applying a further layer of the mixture to the previous layer of the mixture,g) applying the printing fluid only to those parts of the mixture which are supposed to constitute a part of the casting mould,h) repeating steps f) and g) until the desired shape of the casting mould is achieved,i) allowing those parts of the mixture to set which have been mixed with the aqueous solution of magnesium chloride or magnesium sulfate,j) removing the mixture which has not been mixed with an aqueous solution, and coating with a formwork skin at least those parts of the casting mould which come into contact with the material of the cold-casting lamination process.