The import and domestic consumables of inkjet sand mold 3 D printer were investigated comparatively. The silica content

microstructure

grain size distribution

moisture content

bulk density

apparent density of raw sand was analyzed. The pH value and viscosity index of the resin and blinder were tested. The proportion process of imported and domestic consumables when printing and the modification method of domestic resin were explored. The results indicate that the domestic sand can directly replace the import one

which has similar performance parameters. As an important index of resin

viscosity need to match with the print nozzle

which is the core component of the printer. The viscosity of imported resin is about 15 mPa·s

while that of domestic resin is about 25 mPa·s. Therefore

domestic resin needs modification before used for printing. Through the design of the orthogonal experiment on the type of raw sand and resin as well as the ratio of resin

the standard eight-character block was prepared and the tensile strength and air output were tested. The results demonstrate that the ratio of resin has the greatest impact on the tensile strength

and when the standard bars use the combination of domestic furan resin x2 with addition of 2% and domestic silicon sand Z1 as raw material

the tensile strength meet the printing requirements. The results of modification experiment on domestic resin indicate that the optimal amount of modifier is 10%

where sand mold still exhibits enough strength

and the modification is achieved meanwhile.