3D Printed Metal Casting Molds Using Untreated Sand
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Solution Overview
Problem
Existing three-dimensional printing methods for metal-casting molds require complex multi-component build materials and result in non-reusable materials for the mold bed, making them inefficient and costly.
Innovation Solution
Using untreated conventional casting sand combined with a polymer-based binder for three-dimensional printing to create metal casting molds, eliminating the need for complex build materials and enabling the reuse of the build material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-component build materials are used in three-dimensional printing for metal-casting molds, then the printed molds can be made, but the material complexity increases and the build material becomes non-reusable
Solution Approach 1:
The invention extracts and removes the complex reactive components from the build material system. By using only untreated casting sand without any reactive materials or multi-component mixtures, the patent simplifies the build material to a single conventional material that can be reused after binder removal, thereby resolving the contradiction between achieving sufficient mold strength and maintaining material simplicity
Solution Approach 2:
The invention implements a recovery system where the build material (casting sand) is discarded from the printed mold structure after use and then recovered for reuse in subsequent printing operations. The binder is removed and the casting sand is reused as build material, eliminating waste and reducing material costs while maintaining reliable mold performance
2Loss of substance
If conventional untreated casting sand is used as build material, then material cost decreases and reusability increases, but the ability to form strong bonds between layers may be insufficient
Solution Approach 1:
The invention introduces a binder as an intermediary substance that temporarily holds the untreated casting sand layers together during printing. This binder acts as a mediator that enables layer bonding without requiring the casting sand itself to have bonding properties, and the binder can be removed afterward, allowing the sand to be reused while having provided sufficient strength during the printing process
Solution Approach 2:
The invention changes the physical and chemical parameters of the system by selecting appropriate binder materials and curing conditions that enable strong inter-layer bonding of untreated casting sand. By optimizing binder composition, application methods, and curing parameters, the patent achieves sufficient bond strength while maintaining the reusability of the casting sand after binder removal
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 produces strong, reusable metal casting molds that can withstand the casting process without additional processing, improving efficiency and reducing material costs.
Implementation Method 1
untreated casting sand can be used in combination with a polymer-based binder in the three-dimensional printing process to make casting molds and components
Data Source
AI summary
Methods are disclosed of making metal casting molds and components thereof by the three-dimensional printing process in which an untreated sand is used as the build material and a polymer is used as a component of the binder that is printed onto the build material.