Study On Preparation And Flow Properties Of 3D Printing Materials In Simulated Sand Box

3D printing technology is different from traditional manufacturing,which has good performance of one-time forming,high material utilization rate,low cost,and complex internal structure printing.Similar simulation experiment research is widely used in coal mining,offshore oil and gas exploitation and other fields,which is intuitive,simple,economical and efficient,but also has the disadvantages of long manufacturing cycle,low efficiency,high waste,insufficient simulation of complex structure.Thus,the 3D printing technology and the similar simulation experiment research are combined in this paper,the extrusion system and nozzle structure of the simulated of sand box for 3D printing device are designed.The ratio of 3D printing materials is obtained and the similar model printing is printed with the device.And this experimental study is useful for improving similar simulation experiments and expanding 3D printing field.Firstly,selection,design and finite element analysis are carried out to verify the rationality of nozzle structure.Then,main structural parameters of the nozzle are optimized with the response surface methodology and the optimal results are obtained.After that,we obtained the optimum ratio of simulated of sand box of 3D printing material by using Box-Behnken experimental design method,and studied the flow performance of the ratio.On this basis,the response surface methodology is used to study the effects of different admixtures(gypsum,gypsum retarder,high-efficiency water-reducing agent)on the viscosity of 3D printing materials,and the optimal ratio is obtained under different conditions.Finally,the physical and mechanical properties of the samples after molding through the printing experiment,and effects of different materials is analyzed and their physical and mechanical properties are achieved.