Low-pressure casting mold basin volume equalization
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Solution Overview
Problem
Conventional low-pressure casting molds with sprues of different heights restrict flexibility in apparatus design and lead to uneven solidification times across the mold, limiting the shape and quality of casting products.
Innovation Solution
The low-pressure casting mold features sprue pieces with cylindrical shapes and basins of varying volumes, allowing for differential heat retention and solidification times without altering the structure of the lower mold or stalk, enabling equalization of solidification times across different positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sprues have different heights to achieve equal solidification time, then solidification uniformity is improved, but apparatus design flexibility deteriorates
Solution Approach 1:
The patent applies local quality by providing basins with different volumes at different positions of the lower mold, tailored to the specific heat retention requirements of each sprue position. This allows equal solidification time across all sprues while maintaining design flexibility, as each basin is locally optimized rather than requiring uniform sprue heights throughout the entire apparatus.
2Adaptability or versatility
If sprue heights are standardized, then apparatus design flexibility is improved, but solidification time equalization deteriorates
Solution Approach 1:
Instead of standardizing all sprue heights, the patent provides basins with different volumes at different positions of the lower mold, tailored to the specific heat retention requirements of each sprue position. This allows equal solidification time across all sprues while maintaining design flexibility, as each basin is locally optimized rather than requiring uniform sprue heights throughout the entire apparatus.
3Manufacturing precision
If basin volumes are made position-specific, then solidification time equalization is improved, but mold structure complexity increases
Solution Approach 1:
The patent segments the lower mold into multiple positions, each with its own basin of specific volume. This segmentation allows independent optimization of each basin volume according to the heat retention requirements of the corresponding sprue position, achieving solidification time equalization while keeping the overall mold structure manageable through modular design.
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 configuration enhances design flexibility, ensures uniform solidification, reduces casting cycle time, and produces high-quality products without defects by adjusting the volume of basins under sprue pieces to match the position-specific heat requirements.
Implementation Method 1
at a sprue piece having a basin with relatively large volume, the molten metal in the basin has a large amount of heat, and the solidification time of the molten metal in the sprue is relatively long
Data Source
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AI summary
A low-pressure casting mold includes at least upper and lower molds 4U, 4L forming a cavity 3 and sprue pieces 8, 9 that have cylindrical shapes and that are disposed at different positions of the lower mold 4L. The sprue pieces 8, 9 include sprues 8A, 9A open to the cavity 3 and basins 8B, 9B, and the basins 8B, 9B have different volumes according to the position of the sprue pieces in the lower mold 4. Equalization of the solidification time of molten metal at the sprues 8A, 9A is achieved along with the less influence on the structure of the lower mold 4L and a stalk and the improved flexibility in apparatus design.