Influence Mechanism of Resin Penetration on Molding Accuracy of Sand 3D Printing

Author of the article:LI Zheng1 , SHAN Zhongde2 , SUN Qili1 , ZHANG Xueliang1 , YU Luosheng1

Author's Workplace：1. State Key Laboratory of Advanced Forming Technology and Equipment, Beijing National Innovation Institute of Lightweight Ltd., Beijing 100044, China; 2. Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

Key Words：sand mold 3d printing; molding dimensional accuracy; resin addition amount; hydraulic radius; layer thickness

Abstract：The influence of resin penetration on the molding accuracy of sand mold 3D printing was studied, and the corresponding theoretical model was put forward and verified by experiments. The results show that the resin penetration amount, hydraulic radius and sand thickness affect the precision of sand printing, and have nothing to do with the molding size. With the increase of resin content, the resin penetration pressure and dimensional error increase. The increase of the content of curing agent and the diameter of molding sand will lead to the increase of the hydraulic diameter of molding sand and the dimensional error. The increase of sand layer thickness leads to the increase of resin penetration resistance and the decrease of dimensional error.