Metal Casting Mold with Removable Sections for Rapid Cooling
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Solution Overview
Problem
Current casting methods struggle to produce complex metal workpieces with both intricate shapes and high-quality metal structures, as traditional methods either complicate the casting process or result in suboptimal metal microstructures due to slow cooling.
Innovation Solution
A method involving a ceramic mold that is partially removed during the cooling process, allowing the workpiece to be rapidly cooled by a flowable medium, such as water, which extracts thermal energy more efficiently than the mold, and a casting mold with predetermined breaking points to facilitate controlled cracking and enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional sand casting or permanent mold casting is used for complex shapes, then the casting process can handle intricate geometries, but the cooling rate is insufficient resulting in poor metal microstructure quality
Solution Approach 1:
The mold is divided into two functional parts: a ceramic mold that remains to form complex geometries, and removable sections (such as water-soluble support structures) that can be eliminated to expose the casting to rapid cooling. This segmentation allows the mold to simultaneously provide geometric complexity and enable rapid cooling pathways.
Solution Approach 2:
The invention changes the thermal parameter of the cooling system by introducing a second cooling medium (water or water-soluble material) with superior heat extraction capabilities compared to the ceramic mold. This parameter change enables transition from slow cooling (ceramic-only) to rapid cooling (ceramic + water), improving microstructure quality while maintaining complex shape capability.
2Ease of manufacture
If investment casting or lost-wax casting is used for complex shapes, then the casting process achieves simple mold design, but the cooling rate is too slow resulting in insufficient metal microstructure quality
Solution Approach 1:
The invention modifies the thermal properties of the casting system by introducing water or water-soluble cooling media that provide significantly higher cooling rates than traditional investment casting. This parameter change enables rapid cooling for superior microstructures while preserving the ease of manufacturing complex shapes through water-soluble support structures.
Solution Approach 2:
The mold system combines ceramic materials (for geometric fidelity) with water-soluble support structures (for rapid cooling). This composite approach integrates the advantages of both materials: ceramic provides shape accuracy while the water-soluble component enables rapid heat extraction, resolving the contradiction between ease of manufacture and microstructure quality.
3Stability of the object's composition
If the mold remains in contact with the casting during cooling, then the mold provides structural support, but the cooling rate is limited resulting in slow heat extraction
Solution Approach 1:
The invention extracts or removes portions of the mold (water-soluble support structures) during the cooling process to expose the casting to direct contact with rapid cooling media. This extraction maintains structural support where needed (ceramic portions remain) while enabling rapid cooling in critical areas, resolving the contradiction between stability and cooling speed.
Solution Approach 2:
Water-soluble support structures serve as intermediaries that provide temporary structural support during casting, then dissolve or are removed to allow direct water cooling. This intermediary approach enables the system to sequentially provide both structural stability and rapid cooling without compromise.
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
Enables the production of complex metal workpieces with improved structural properties by combining the advantages of complex shape formation with rapid cooling, resulting in superior metal microstructures compared to traditional methods.
Implementation Method 1
the medium is selected to extract heat energy from the metal casting more quickly than the mold
Implementation Method 2
a flowable cooling medium surrounding the mold, which is capable of extracting heat energy from the metal casting
Implementation Method 3
The mold material can be selected and its wall thickness adjusted so that the mold breaks due to thermal stresses when the cooling medium is introduced
Data Source
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AI summary
The invention relates to a method for producing metal castings (401) in which molten metal is poured into a mold (204). After the molten metal has begun to solidify and while still cooling, the mold (204) is at least partially removed from the metal casting, thereby bringing the metal casting into contact with a free-flowing cooling medium (500) surrounding the mold. This cooling medium is designed to extract heat energy from the metal casting more quickly than the mold (204). This allows for a high cooling rate even when using investment casting molds, resulting in high-quality metal microstructures.