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Sand Casting Parts Series 4
The production process of sand casting is different because of the different binders and curing agents used. Common sand casting processes include water glass sand casting, resin sand casting, coated sand casting, etc.
1. Water glass sand casting is to use water glass as a binder and quartz sand in a certain proportion to mix into molding sand. After the mold is made, carbon dioxide is blown to solidify, and then the mold is removed, the box is closed, and the casting is poured. Water glass sand, also known as sodium silicate sand, is a sand mold material made of quartz sand as a base material and water glass as a hardener in a certain proportion. The sand mold made of water glass sand is relatively hard and can work at high temperatures. Therefore, it is widely used in casting large and high-precision castings, such as engine cylinders.
2. Resin sand casting refers to molding sand or core sand with artificial synthetic resin as a binder for sand particles. After the resin sand is used to make a mold or core, the resin undergoes an irreversible cross-linking reaction and solidifies through the action of a curing (hardening) agent, thereby giving the mold or core strength. Resin sand casting has a smooth surface, high precision and stable size, and has been widely used in precision casting fields such as automotive parts.
3. Coated sand casting refers to the molding sand or core sand whose surface is covered with a layer of solid resin film before molding. There are two coating processes: cold method and hot method: cold method dissolves the resin and adds urotropine during the sand mixing process so that the two are coated on the surface of the sand to obtain coated sand; hot method preheats the sand to the temperature, adds resin to melt it, stirs to coat the resin on the surface of the sand, adds urotropine aqueous solution and lubricant, cools, crushes and screens to obtain coated sand. Used for casting steel and iron parts.
Coated sand mainly uses quartz sand as raw sand, thermoplastic phenolic resin, urotropine and enhancer as raw materials. According to the different needs of users, the proportion is appropriately adjusted in terms of curing speed, demolding, fluidity, disintegration, surface finish of castings, storage, etc. It is one of the molding materials for automobiles, tractors, hydraulic parts, etc.
The production process of sand casting is different because of the different binders and curing agents used. Common sand casting processes include water glass sand casting, resin sand casting, coated sand casting, etc.
1. Water glass sand casting is to use water glass as a binder and quartz sand in a certain proportion to mix into molding sand. After the mold is made, carbon dioxide is blown to solidify, and then the mold is removed, the box is closed, and the casting is poured. Water glass sand, also known as sodium silicate sand, is a sand mold material made of quartz sand as a base material and water glass as a hardener in a certain proportion. The sand mold made of water glass sand is relatively hard and can work at high temperatures. Therefore, it is widely used in casting large and high-precision castings, such as engine cylinders.
2. Resin sand casting refers to molding sand or core sand with artificial synthetic resin as a binder for sand particles. After the resin sand is used to make a mold or core, the resin undergoes an irreversible cross-linking reaction and solidifies through the action of a curing (hardening) agent, thereby giving the mold or core strength. Resin sand casting has a smooth surface, high precision and stable size, and has been widely used in precision casting fields such as automotive parts.
3. Coated sand casting refers to the molding sand or core sand whose surface is covered with a layer of solid resin film before molding. There are two coating processes: cold method and hot method: cold method dissolves the resin and adds urotropine during the sand mixing process so that the two are coated on the surface of the sand to obtain coated sand; hot method preheats the sand to the temperature, adds resin to melt it, stirs to coat the resin on the surface of the sand, adds urotropine aqueous solution and lubricant, cools, crushes and screens to obtain coated sand. Used for casting steel and iron parts.
Coated sand mainly uses quartz sand as raw sand, thermoplastic phenolic resin, urotropine and enhancer as raw materials. According to the different needs of users, the proportion is appropriately adjusted in terms of curing speed, demolding, fluidity, disintegration, surface finish of castings, storage, etc. It is one of the molding materials for automobiles, tractors, hydraulic parts, etc.
