Optimizing Resin Dosage and Sand Grading to Enhance the Properties of 3D-Printed Furan Sand Molds
DOI:
https://doi.org/10.24425/afe.2026.157987Abstract
This study investigates the influence of resin content, curing agent ratio, curing time, and sand grading on the strength, gas permeability, and gas evolution behaviours of furan resin sand molds in 3D printing-based sand casting. The focus is on optimizing material usage and aligning with sustainable manufacturing objectives to minimize the waste. A multivariate quadratic polynomial regression model was developed through orthogonal experiments and microstructural characterization. The findings indicate that the addition of furan resin is crucial for determining the tensile strength, gas evolution, and permeability of sand molds. Under the process parameters of 2.0% resin content, 40% curing agent ratio, and 24-hour curing time, the sand mold demonstrated a tensile strength of 2.98 MPa, gas evolution of 10.4 mL/g, and permeability of 119.3 AFS. Further increasing the resin content beyond 2.0% resulted in a plateau in the strength gain, accompanied by a sharp increase in gas evolution. The application of an optimized sand grading ratio of 3 parts coarse (150-212 μm) to 7 parts fine (106-150 μm) led to comprehensive performance improvements: the tensile strength increased to 3.02 MPa, gas evolution was controlled at 11.2 mL/g, packing density approached theoretical optimum values, and surface roughness was significantly reduced to a Sa value of 43.478 μm. This study formulates a multi-objective optimization framework and strengthens the theoretical basis for furan resin sand molding in 3D printing, providing industrially viable solutions to minimize typical defects, such as gas porosity and sand adhesion, in real-world casting operations.
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