Bottom Gas Extraction for Steel Castings
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Solution Overview
Problem
The sand casting process generates gases from binder degradation, which can lead to inclusions in cast metal articles, affecting the cleanliness and properties of steel components.
Innovation Solution
A gas extraction system is integrated into the casting device, featuring a gas chamber connected to a vacuum pump and bottom vents in the lower sand mold, guiding gases generated during the casting process away from the molten metal, reducing inclusion formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sand molds with organic binders are used for casting, then the molding process is feasible and common, but gas inclusions are generated in the molten metal reducing steel cleanliness
Solution Approach 1:
The patent extracts and removes the harmful gases generated during casting by introducing a vacuum system with extraction channels that connect to the lower sand mold. The vacuum pump actively sucks out gases from the mold cavity before they can be incorporated into the molten metal, thereby eliminating the harmful effect while maintaining the use of conventional organic binder sand molds
Solution Approach 2:
The patent introduces a vacuum system as an intermediary between the gas generation source (binder degradation) and the molten metal. This intermediary actively intercepts and removes gases through extraction channels and vacuum pumping, preventing direct contact between gases and molten metal while allowing the casting process to proceed normally
2Object-affected harmful factors
If vacuum extraction system is added to remove gases, then steel cleanliness is improved, but device complexity increases
Solution Approach 1:
The patent segments the gas extraction function into distributed extraction channels embedded within the lower sand mold structure. Rather than a single complex extraction mechanism, multiple simple channels are distributed throughout the mold, each independently connected to the vacuum system, simplifying the overall design while maintaining effective gas removal
Solution Approach 2:
The patent merges the gas extraction channels directly into the sand mold structure itself, combining the molding function and gas extraction function into a single integrated component. This eliminates the need for separate extraction apparatus and reduces overall device complexity while achieving the desired gas removal effect
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
Substantially reduces the presence of gas inclusions in the cast metal by actively extracting gases through the vacuum system, thereby improving the cleanliness and properties of the steel articles.
Implementation Method 1
a gas extraction system comprising a gas chamber (9) located between a top surface (7a) of a support table (6) and a bottom surface (5a) of the lower sand mold (5), the gas chamber being connected to a vacuum pump (13)
Data Source
Figure 1
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AI summary
A gas extraction system for extracting gas generated when casting metal articles by a sand moulding process using a casting device that comprises an upper sand mold (4) a lower sand mold (5) and a support table (6) for supporting the molds (4,5). The extraction system comprises a gas chamber (9) located between the top surface (7a) of the support table (6) and a bottom surface (5a) of the lower sand mold (5): The gas chamber (9) isg connected to a vacuum pump (13).