The application of 3DP process in the manufacture and production of medium and large stamping die casting steel parts was nalyzed.The tensile strength

gas permeability

gas generation and other properties of the sand mold were measured

and sand mold was designed based on 3DP process.The results show that the tensile strength of the sand mold by 3DP technology can reach 1.70 MPa

and the gas permeability is more than 400 with the maximum gas generation of 14.6 mL/g

which can meet the requirements of alloy steel casting.The 3DP process forming sand mold（core）has the advantages of mold free

sand type and sand core integration process

as well as improving the precision of the casting.Through the 3DP sand design

the problem of the sharpness of the printed sand word was solved by a special process.