Sand Moulding Machine Fluidised Bed Airflow
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Solution Overview
Problem
Existing sand moulding machines face challenges in achieving satisfactory density and hardness, particularly in critical regions with deep pockets or large extensions of patterns, leading to uneven metal casting quality and increased manual finishing needs.
Innovation Solution
The introduction of compressed air inlet openings in the lower part of the moulding chamber to create an upward airflow, forming a fluidised bed of sand that flows like water into deep areas, ensuring even compaction and improved sand distribution across the chamber bottom and side walls, thereby enhancing the hardness and strength of the sand moulds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sand is blown into the moulding chamber through a slit-formed opening and compacted by mechanical squeezing, then the sand filling process is simple and fast, but the sand density is insufficient in critical regions such as deep pockets and large extensions of patterns
Solution Approach 1:
The patent applies pneumatic principles by introducing compressed air through inlet openings in the chamber bottom wall to fluidize the sand. This creates upward airflow that penetrates deep into the moulding chamber, carrying sand particles into critical regions such as deep pockets and large extensions of patterns, thereby achieving uniform sand distribution and density without complex mechanical filling systems
Solution Approach 2:
The patent changes the physical state of sand from static to fluidized state by introducing compressed air. This parameter change allows sand to flow like a fluid into difficult-to-reach areas, improving sand density in critical regions while maintaining a simple device structure
2Adaptability or versatility
If the sand mould is produced with deep pockets and large extensions of patterns, then the metal casting versatility is improved, but the sand hardness and strength become uneven leading to deformation and penetration during casting
Solution Approach 1:
The compressed air system penetrates deep into the moulding chamber through inlet openings in the bottom wall, fluidizing sand and enabling it to fill deep pockets and create uniform sand density throughout. This results in even sand hardness and strength throughout the mould, preventing deformation and penetration during metal casting while supporting deeper patterns and longer protrusions
Solution Approach 2:
The patent introduces airflow from the bottom dimension upward through the sand bed, creating a three-dimensional fluidization effect. This vertical airflow dimension enables uniform sand distribution in deep pockets and complex geometries, achieving consistent sand hardness throughout the mould structure
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 approach results in more even hardness and strength throughout the sand moulds, reducing deformation and penetration during metal casting, improving surface quality, and allowing for deeper patterns and longer protrusions, thus increasing the versatility and metal casting capacity of the sand moulding machine.
Implementation Method 1
create an upward airflow in at least a part of the moulding chamber in order to create an at least substantially fluidised bed of sand
Data Source
AI summary
The sand moulding machine (1) includes a moulding chamber (2) formed by a chamber top wall (3), a chamber bottom wall (4), two opposed chamber side walls and two opposed chamber end walls (7, 8). A chamber wall is provided with a sand filling opening (9) communicating with a sand feed system (10). At least one of the chamber end walls is provided with a pattern plate (12, 13) having a pattern (14, 15). At least one of the chamber end walls is displaceable in order to compact sand fed into the moulding chamber. A number of compressed air inlet openings (18, 43) are located in a lower part of the moulding chamber and are arranged to form an upward airflow in at least a part of the moulding chamber in order to create an at least substantially fluidised bed of sand during a sand filling operation.