Fiber Casting Elements Resist Sand Leakage
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Solution Overview
Problem
Conventional casting elements made from ceramic refractory materials in the foundry industry are prone to sand leakage, resulting in poor product quality, high costs, and inefficient recycling, especially when dealing with high-temperature molten metals.
Innovation Solution
A high-temperature-resistant casting system composed of refractory and silicate fibers with a binder mixture, including sodium silicate, mullite, graphite, and brown fused alumina, which forms a filtering element with embedded cartridges and a filter screen, enhancing thermal resistance and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ceramic refractory materials are used for casting elements, then the structure is stable, but sand leakage occurs and product quality deteriorates
Solution Approach 1:
The patent uses a composite material system combining refractory fibers (41-51%), silicate fibers (40-51%), and binder (5-19%). This composite structure integrates the high-temperature stability of refractory materials with the filtration capabilities of fiber networks, preventing sand leakage while maintaining structural integrity during casting operations.
Solution Approach 2:
The fiber-based composite creates a porous structure that allows molten metal to flow through while trapping sand particles. The interconnected voids between fibers provide filtration function, enabling the casting element to maintain structural stability while preventing sand contamination of the casting.
2Temperature
If conventional ceramic refractory materials are used, then the casting element can withstand high temperatures, but the weight is heavy and recycling is troublesome
Solution Approach 1:
The patent employs a lightweight composite material composed of refractory fibers and silicate fibers bound with a binder system. This composite achieves high-temperature resistance (withstanding molten metal temperatures) while significantly reducing weight compared to conventional dense ceramic refractories, facilitating easier handling and recycling.
Solution Approach 2:
The patent changes the material parameters from dense ceramic structure to fibrous composite structure. This parameter change maintains the essential high-temperature resistance property while dramatically altering the weight characteristic, making the casting element lighter and more recyclable without sacrificing thermal performance.
3Device complexity
If conventional casting elements are used, then the structure is simple, but sand leakage causes product scrapping and increases costs
Solution Approach 1:
The patent uses a composite fibrous material that inherently provides filtration function. The refractory fiber and silicate fiber network creates a natural filter that traps sand particles while allowing metal flow, eliminating sand leakage issues without adding complex mechanical filtration components to the casting system.
Solution Approach 2:
The porous structure of the fibrous composite material provides built-in filtration capability. The interconnected pores and voids between fibers act as a physical barrier to sand particles while permitting molten metal passage, preventing sand contamination and product scrapping without increasing device complexity.
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 system effectively withstands high temperatures, reduces exhaust gas and waste, and increases the quality and yield of castings by 5-8%, making it environmentally friendly and energy-efficient.
Implementation Method 1
the prepared casting elements prepared from paper fiber, carbon fiber and silicate fiber in a specific proportion has excellent high-temperature resistance, and high-temperature molten iron at 1500-1750° C. can pass through smoothly
Implementation Method 2
the filtering element includes two filter cartridges in an embedded connection and a filter screen
Implementation Method 3
the binder is a mixture of sodium silicate, mullite, graphite and brown fused alumina
Implementation Method 4
putting the formed wet form body of the casting element in a drying chamber, and evaporating and dehydrating the wet form body subjected to circular hot air drying
Data Source
AI summary
A high-temperature-resistant casting system comprises following casting elements in a connection relationship: a sprue cup (1) and a down sprue (2) connected with a lower end of the sprue cup, wherein the other end of the down sprue is connected with one end of a filtering element (6), the other end of the filtering element is connected with a three-way pipe (3), openings in two sides of the three-way pipe are connected with one end of an inlet section of a runner (4), and one end of an outlet section of the runner is connected with a tapered elbow (5). The casting elements comprise the following components in percentage by weight: 41-51% of a refractory fiber, 40-51% of a silicate fiber and 5-19% of a binder. A preparation method of the high-temperature-resistant casting system is further provided.