Effect of Digital Flexible Extrusion Process on the Properties of Sand Mold
Author of the article:GUO Lijun;SHAN Zhongde;LIU Limin
Author's Workplace：State Key Laboratory of Advanced Forming Technology and Equipment,China Academy of Machinery Science and Technology,Beijing 100044,China
Key Words：precision forming technology of pattern-less casting digital flexible extrusion sand molding tensile strength
Abstract：In order to make the digital flexible extrusion sand mold have excellent sand mold properties,the influence of the digital flexible extrusion technology on the sand mold properties was studied.The results show that the tensile strength of sand mold increases with the increase of extrusion pressure when the resin content is low.When the resin content is greater than 2.4%,the tensile strength of sand mold decreases with the increase of extrusion pressure.With the increase of content,the tensile strength of sand mold increases.Under the same condition of resin content,sand permeability decreases with the increase of extrusion pressure.Under the premise of certain resin content,when the extrusion pressure is less than 0.15 MPa,the compactness of the sand mold increases with the increase of the extrusion pressure.When the extrusion pressure is greater than 0.15 MPa,the impact of the extrusion pressure on the compactness of the sand mold is less.
