Taking the process parameters such as coating poise,single dipping time and number of dip-ping times as the influencing factors,an orthogonal test of water-based coating dipping was designed to study the effects of the above factors on the surface roughness,coating layer thickness and coating layer thickness uniformity of the 3D printed sand mold,and to obtain the optimal process of water-based coating dipping.With this process,the coating surface roughness can reach Ra3.2～Ra6.3,the coating thickness is 0.3 mm～0.35 mm,and the coating uniformity is good.The surface roughness of castings can reach Ra6.3 by practical verification.
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