Zinc alloy die casting process can be divided to hot chamber die casting and cold chamber die casting. The difference between them is the different die casting machines they are using. Generally speaking, hot chamber die casting machine is much suitable for small and light zinc products, while cold chamber die casting machine for weight and large zinc die casting products.
All of die casting machines Parison owned are cold chamber die casting machines. And we indeed prefer to casting a little larger zinc products. Besides we are willing to help outsource small and light zinc die cast products from other hot chamber die casting foundries. Our precision machining factory also outsources raw die castings of zinc alloy for further precision machining.

1.Cold chamber die casting of zinc alloy

Cold chamber die casting process need the molten zinc alloy to be ladled into the cold chamber, then inject it into the die cavity. The molten zinc alloy is kept in electronic furnace or other kinds of furnace can be protected from reaction with atmosphere. Thus the cold chamber die cast products can have much purer alloy. Furthermore, the cold chamber die casting process can have low and steady deviation, that is to say high precision of die casting.
The only limitation of cold chamber die casting machine is that it's not suitable for small die casting. The main reason is the excessive weight of spure and running system compared with the costing itself. The several times heavier spure and running system have to be remelted or as waste. It is much more costly than hot chamber die casting process.

2.Hot chamber die casting of zinc alloy

Hot chamber die casting process was invented earlier than cold chamber die casting process. It is preferable for casting zinc, copper and lead alloys. The hot camber die casting process is much more suitable for small size die cast products. And commonly the hot chamber die casting process have a much swifter speed than cold chamber die casting process.

Hot chamber die casting process is not suitable for large size die cast products. The more times flowing of molten alloy will react with oxygen within atmosphere. And for larger parts, the hydraulic shot cylinder have to press more than one time, as leads to different time solidification and bad inner structure of casting.