标题：Evaluation and Analysis on Surface Adhesion of 3D Printed Sand Mold [铸造3D打印砂型表面粘附问题评估与分析]
作者：Wang H.-T.; Gao X.-J.; Wang W.
作者机构：[Wang, H.-T] School of Mechanical Engineering, Shandong University of Technology, Zibo, 255000, China, National Intelligent Foundry Industry Innovatio 更多
关键词：3D printing; Adhesive layer; Casting; Sand mold/core
摘要：The adhesive layer at the surface of sand mold/core produced by 3D printing will limit the application of 3D printing to the production of sand mold/core with complex structure and affect the dimensional accuracy of sand mold/core. In the present paper, the adhesive layer thickness is evaluated according to the strength of adhesive layer at different depths by using the "8-shaped" sand block tensile sample with a gap at the middle. Based on the principle of 3D printing, the adhesive layer on the surface of the 3D printing sand mold/core is analyzed in detail. it is found that the viscosity of the resin used in 3D printing is lower than that used in traditional production due to the need of ink-jet, so it easily expand and flow in the interval of sand particles, and the satellite droplets of the injection, and the spray formed by choked nozzle are the main reasons for adhesive layer formation. Therefore, some suggestions were made to avoid the presence of the adhesive layer. For example, choose the resin binder with reasonable viscosity, no use excessively resin, use three or four screen sand to reduce the sand interval, decrease the extreme small particles in sand as far as possible, et al. For the sand mold/core with adhesive layer formed, it is conducive to removal of the surface adhesive layer by heating and applying overall vibration to the sand mold/core. © 2020, Chinese Mechanical Engineering Society. All right reserved.