We take sand casting as an example, the factory of large-scale production of precision casting should create conditions to adopt advanced molding and core making methods. The production line of old jar type or shock type molding machine is not high enough in productivity, the labor intensity and noise of workers are large, which can not meet the requirements of mass production, so it should be reformed step by step. For small castings, horizontal parting or vertical parting box less high-pressure molding machine production line can be adopted, and the full mold molding machine has high production efficiency and less floor space; for medium castings, various box high-pressure molding machine production lines and air impact molding lines can be selected to adapt to rapid and high-precision modeling According to the requirements of the production line, the core making methods can be selected as follows: cold core box, hot core box, shell core and other efficient core making methods, while resin self hardening sand molding and core making can be considered for medium batch large castings.

Manual molding is still an important method for heavy castings produced in small batch and single piece production. Manual molding can adapt to various complex requirements, and it is flexible and does not require a lot of process equipment. Water glass sand mold, VRH water glass sand mold, organic ester sodium silicate self hardening sand mold, clay dry mold, resin self hardening sand mold and cement sand mold can be applied. For heavy castings produced by single piece, the pit molding method has low cost and fast production. It is more suitable to adopt multi box molding and split box molding for the finalized products of mass production or long-term production. Although the investment of mould and sand box is high, it can be compensated from saving molding time and improving product quality.

Low pressure casting, die casting, centrifugal casting and other casting methods are only suitable for mass production because of the high cost of equipment and mold.

The conditional approach should be appropriate