Sand Mold Mechanical Property Evaluation via Virtual Copying
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Solution Overview
Problem
Current methods for evaluating the mechanical properties of sand molds are rudimentary and ineffective, especially when dealing with agglomerated sands or measuring properties of the molds themselves, lacking standardized and subjective interpretation-free approaches.
Innovation Solution
A method and equipment for evaluating mechanical properties involve extracting a sample from a sand mold, curing it, conditioning it to specific dimensions, and subjecting it to a mechanical breaking strength test under controlled conditions, with reference samples used for comparison to determine the actual mechanical strength values and identify potential improvements in the molding compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rudimentary control systems and subjective interpretation systems are used to measure mold properties, then the evaluation process is simple, but the measurement precision and reliability are poor
Solution Approach 1:
The invention creates a virtual model that replicates the physical mold's mechanical properties through finite element analysis. This virtual copy allows for precise measurement of stress, strain, and deformation without requiring complex physical testing equipment, thereby achieving high measurement precision while avoiding excessive device complexity
Solution Approach 2:
The invention replaces physical mechanical testing systems with a computational mechanics approach using finite element analysis. The virtual model subjected to simulated loads substitutes for actual physical testing, eliminating the need for complex mechanical testing devices while maintaining measurement accuracy
2Reliability
If sampling and test systems extract samples from sand mixture at given heights, then the testing process is simplified, but the reliability of evaluating actual mold properties is reduced
Solution Approach 1:
Instead of extracting physical samples that may not represent the entire mold, the invention creates a virtual model that replicates the complete mold structure and its mechanical properties. This virtual copy allows for comprehensive evaluation of actual mold properties throughout the entire structure, significantly improving evaluation reliability
Solution Approach 2:
The invention performs preliminary characterization of the molding compound's mechanical properties through uniaxial compression tests, then uses these characterized parameters in the finite element model. This preliminary action ensures the virtual model accurately represents the actual mold's behavior, improving reliability without requiring complex sampling during actual testing
3Ease of operation
If multiple rods are used to prevent sample agglomeration during extraction, then the sample handling is improved, but the device complexity increases
Solution Approach 1:
The invention eliminates the need for complex physical sample handling devices with multiple rods by creating a virtual model. The virtual sampling process can be simulated and analyzed without requiring elaborate physical equipment, thereby improving ease of operation while reducing device complexity
Solution Approach 2:
The invention extracts only the essential mechanical property data from the mold through the virtual model approach, eliminating the need for complex physical sample extraction mechanisms. By taking out only the necessary information through computational analysis, the system achieves ease of operation without requiring multiple rods or complex handling devices
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 allows for standardized evaluation of sand mold mechanical properties, identifying weak points and optimizing molding compound performance, leading to improved stability and cost reduction in cast part production.
Implementation Method 1
The molding compound acquires its form by means of using the molding tools corresponding to the part to be produced. The molds are formed by means of compaction, i.e., tamping the molding compound, and then curing.
Implementation Method 2
subjecting the conditioned real test piece to a mechanical breaking strength test under predetermined pressure and temperature conditions
Implementation Method 3
subjecting the conditioned real test piece to a mechanical breaking strength test
Data Source
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AI summary
The present invention relates to a method for evaluating the mechanical properties of sand molds which comprises subjecting, at least one conditioned real test piece with predetermined dimensions and obtained from an extracted real test piece extracted from an uncured sand mold having a predetermined composition, curing the extracted real test piece for a predetermined curing time and conditioning the cured real test piece to the predetermined dimensions, to a mechanical breaking strength test under predetermined pressure and temperature conditions to obtain real mechanical strength values; comparing the real mechanical strength values with reference mechanical strength values of a conditioned reference test piece with the predetermined dimensions and obtained by compacting, applying predetermined compacting conditions, a reference composition comprising the same molding compound and the same binding system as the uncured sand mold, curing the cured reference test piece thus obtained for a reference curing time, and conditioning the cured reference test piece at the predetermined conditions; and evaluating the mechanical properties of the conditioned real test piece by comparing its real mechanical strength values with the reference mechanical strength values, the reference mechanical strength values of the conditioned reference test piece having been obtained by means of a reference mechanical breaking strength test under the same pressure and temperature conditions as the test to which the conditioned real test piece is subjected.