Casting Mould Through-Channel Cooling for Cast Iron Strength
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Solution Overview
Problem
Existing methods for casting molten metal cast pieces with through-openings often result in uneven cooling, leading to internal stresses and reduced mechanical properties, requiring additional equipment and processes like slow cooling or annealing to minimize these issues.
Innovation Solution
A method involving a casting mould with a moulding material that disintegrates under force or temperature, allowing for the creation of a through-channel within the cast piece, through which a cooling medium flows to accelerate cooling rates, reducing temperature gradients and enhancing mechanical strength by forming a high-tensile structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cooling methods are used, then the casting process is simple, but internal stresses and reduced mechanical properties occur
Solution Approach 1:
The cooling system is segmented into multiple independent cooling circuits that can be selectively activated in different regions of the casting mould. This allows targeted cooling of specific areas to control the solidification pattern and reduce internal stresses, while keeping other regions at higher temperatures to maintain structural integrity during the casting process.
Solution Approach 2:
Different regions of the casting mould are assigned different cooling characteristics through the selective activation of cooling circuits. Critical areas prone to internal stresses receive enhanced cooling, while other regions maintain more uniform temperature distributions. This local differentiation of cooling quality enables optimization of mechanical properties without requiring complete system complexity throughout the entire mould.
2Strength
If slow cooling is applied to minimize stresses, then mechanical properties improve, but production time increases
Solution Approach 1:
The cooling circuits are pre-configured in the casting mould with different activation characteristics. During the casting process, the system can selectively activate specific cooling circuits at predetermined times to create optimal cooling patterns that prevent internal stresses from forming in the first place, rather than relying on slow post-casting cooling.
Solution Approach 2:
The cooling process is made continuous and controlled through the selective activation of multiple cooling circuits during the casting process itself. Instead of a single slow cooling phase after casting, the system maintains continuous cooling action in specific regions throughout the solidification process, achieving stress-free structures faster by overlapping cooling actions with the casting operation.
3Strength
If annealing is performed to reduce stresses, then mechanical properties improve, but additional equipment and processes are required
Solution Approach 1:
The casting mould itself provides the stress-reducing cooling function through its integrated cooling circuits, eliminating the need for separate annealing equipment. The mould's cooling system performs the function that would otherwise require a dedicated annealing process, making the system self-sufficient and reducing overall process complexity.
Solution Approach 2:
The cooling circuits in the casting mould serve multiple functions: they control the solidification pattern during casting, prevent internal stress formation, and can be configured to provide stress-relief cooling without requiring separate annealing operations. This multi-functionality consolidates what would traditionally be separate processes into a single integrated operation.
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
This method achieves significantly greater strength in cast pieces by allowing faster cooling of critical regions, reducing heat-related stresses, and increasing the percentage of martensitic structure, particularly in cast iron alloys used for cylinder crankcases, resulting in 50% greater loading capacity compared to conventionally cooled pieces.
Implementation Method 1
cooling of the cast piece in the casting mould whilst a cooling medium flows through the through-channel
Implementation Method 2
cooling of the cast piece in the casting mould whilst a cooling medium flows through the through-channel
Implementation Method 3
burning the binder in the moulding material out of the casting core representing the through-opening by means of the heat input into the casting mould when pouring the molten metal into said casting mould
Implementation Method 4
mechanically destroying, at least in part, the casting core representing the through-opening and the regions of the casting mould arranged in the extension of said core
Implementation Method 5
pouring of the molten metal in the casting mould to form the cast piece
Implementation Method 6
cooling of the cast piece in the casting mould to a temperature, which is below the liquidus temperature of the molten metal, but above a minimum temperature, from which minimum temperature accelerated cooling effects the formation of a high-tensile structure
Implementation Method 7
increasing the percentage of martensitic structure, particularly in cast iron alloys used for cylinder crankcases
Data Source
AI summary
A method to produce cast pieces with optimum mechanical properties having through-openings with minimal outlay in terms of equipment. A casting mold in which at least one casting core is used. A through-channel leading through the through-opening of the cast piece is formed by burning the binder in the molding material out of the casting core representing the through-opening by means of the heat input into the casting mold when pouring the molten metal into the casting mold, or by mechanically destroying, at least in part, the respective casting core representing the through-opening and the regions of the casting mold arranged in the extension of the casting core.