What is resin sand casting, what is called coated sand casting?What are the advantages and what are they used for?
Resin sand casting is the original sand and resin, curing agent mixed evenly, put into the sand box, shape, molding core, after the box castingResin sand is a general term, coated sand is a kind of resin sand
When heated in the resin coated sand coated sand surface melting, the decomposition of methylene urotropin under the action of the body structure of molten resin is composed of linear structure quickly into the melt, so that the coated sand curing. The coated sand is generally dry granular, in recent years China has been a manufacturer to develop wet and sticky the shape of coated sand.
In front of molding sand on the surface has been covered with a layer of solid resin sand, sand core called coated sand, also known as shell mold (core) sand. It is one of the earliest thermosetting resin sand, by the German Cronin (CRONING), invented in 1944. The process is a powder heat thermosetting phenolic resin and sand mechanical mixing, heating and curing. It has developed into a thermoplastic phenolic resin and curing agent (such as Urotropine) and lubricant (such as calcium stearate) prepared by film coating process of sand,
