Shell casting is a casting method that uses thin shell casting to produce castings. 020202020202 The equipment for making thin-shell molds is called a core shooter. 020202020202 Core Shooter Molding Currently, there are two main processes: thermal coated sand molding (commonly known as hot core box) and cold resin sand molding (commonly known as cold core box). 02020202020202 Hot core box molding is to heat the metal mold installed on the hot core box core shooter with an electric heating tube to the set temperature, and then use compressed air to blow the finished dry phenolic resin coated sand into the mold cavity. After a certain curing time, the mold is opened to obtain a strong sand mold. 02020202020202 His basic process requirements are: heating temperature 180~280℃; curing time 30~150s; sand injection pressure 0.15~0.6MPa. The specific parameters should be adjusted according to the equipment model, sand mold quality and complexity, type of coated sand, etc. The principle is that simple sand types, coated sand with good fluidity (or coarser grain size) can choose lower sand shooting pressure, thin sand types should choose a lower heating temperature, and the curing time can be extended appropriately when the heating temperature is low; vice versa. 02 02 02 02 02 The cold core box molding is that the wet resin sand mixed by the sand mixer (P1) is added to the cold core box core shooting machine (P1), the sand is blown into the mold cavity with compressed air, and the triethylamine gas is blown into the mold through the triethylamine generator (P1) to make the sand mold quickly solidify. One group of binders for triethylamine sand mixing is divided into phenolic resin, the two components are polyisocyanate, and the catalyst is triethylamine.