Basic Infiltration Agent for Acid-Cured Molds
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Solution Overview
Problem
The production of GJS and GJL castings often results in pitted surfaces, a casting defect characterized by large, roughened areas with a white coating, primarily due to the use of acid-hardened furan resin molding materials and cold-curing processes, which are difficult to prevent and costly to rectify, leading to increased rework and potential rejection of castings.
Innovation Solution
A basic composition comprising one or more strong bases with a pK B value less than 3.0, used as an infiltration agent for molds made of quartz sand and acid-cured binders, neutralizes residual acid in the molding material, preventing the formation of pitted surfaces by reacting basicly with water and ensuring even curing of the binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acid-hardened furan resin molding materials and cold-curing processes are used, then fast cycle times and mass production are enabled, but pitted surfaces with white coating occur on castings
Solution Approach 1:
The basic composition is applied to the molding material before casting to neutralize residual acid and prevent the chemical reaction that causes pitted surfaces. This preliminary treatment eliminates the harmful effect while maintaining the fast cold-curing process benefits
Solution Approach 2:
The residual acid in the acid-hardened binder, which causes pitted surfaces, is neutralized by applying a basic composition. The harmful acidic reaction is converted into a beneficial neutralization process that prevents surface defects without sacrificing production speed
2Duration of action of moving object
If acid-hardened binders are used for cold-curing processes, then rapid hardening and short cycle times are achieved, but residual acid reacts with water to cause pitted surfaces
Solution Approach 1:
A basic composition acts as an intermediary substance applied to the molding material to neutralize residual acid before casting. This intermediary treatment prevents the harmful reaction between residual acid and water that causes pitted surfaces, while not interfering with the rapid hardening process
3Manufacturing precision
If infiltration with basic composition is performed, then pitted surfaces are suppressed, but additional processing step is required
Solution Approach 1:
The basic composition is applied in advance to the molding material to neutralize residual acid before the casting process. This preliminary action prevents pitted surfaces from forming during casting, maintaining surface quality without requiring complex post-processing
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 use of this basic composition effectively suppresses the formation of pitted surfaces, allowing for the production of GJS and GJL castings with standard dimensions, reducing rework, machining allowances, and testing efforts, while improving the mechanical characteristics of the finished castings.
Implementation Method 1
A basic composition comprising one or more strong bases with a pK B value less than 3.0, used as an infiltration agent for molds made of quartz sand and acid-cured binders, neutralizes residual acid in the molding material, preventing the formation of pitted surfaces by reacting basicly with water
Data Source
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AI summary
The present invention relates to the use of a composition comprising a basic component consisting of one or more bases and a carrier liquid for the basic component as an infiltration agent for the molding material of a casting mold, which comprises quartz sand and an acid-cured binder. The present invention also includes a corresponding method for producing a GJS or GJL casting.