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Four Main Precision Casting Method
2016-03-21

As far as we know, casting is one of the oldest process that done on metals, and now, it is widely used in producing all kinds of Precision Casting . Generally speaking, there are four main types of castings, say, sand casting, permanent mold casting, plaster casting, and die casting. According to different usages and the properties of the product required, each type of casting has its own advantages and disadvantages.

Sand casting: in fact, it is the oldest casting, and was used since ancient time. The sand used in this method will directly affect the texture of the product, and the final product needs smooth finishing. The general materials used in this method include iron, steel, bronze, brass, aluminum, and magnesium alloys which often contain lead, tin, and zinc.

Permanent mold casting: two pieces of mold are used in this method, and they need to be joint together. Then, pour molten metal into the joint mold. The hot metal is allowed to cool and the mold pieces are separated. Some products have metal extrusion which are removed by flash grind or by hand. And the this method is commonly used to mould tin, lead, and zinc.

Plaster casting: it is one of the easiest methods. However, it is normally used for metals with low melting point like copper, zinc, and aluminum. This is the easiest process because mold can be made easily in case it breaks in the procedure.

Die casting: this method is done by introducing molten metal into the mold at high or low pressure. Previously, only low-pressure die casting is used, but today, high pressure die casting is used more extensively. In this process, molds are well designed to give complex products with stunning accuracy and smooth finishing. In generally, they are made of high quality steel as steel has higher melting point, and these molds can be reused thousands of times. Generally, zinc, copper, aluminum, magnesium, lead, pewter and tin based alloys are used for die casting.

With die casting, pore-free products can be produced which prohibit gas to pass through them and making them strong. Besides, cold-chamber and hot-chamber die casting machines are two machine that use this cast. Hot-chamber die casting is used for high fluidity metals. First the molten metal is collected using goose neck and then the metal is shot into the mold. While, the cold-chamber casting is the substitution of the hot-chamber casting, which is used where hot-chamber can not be used. In this process, the molten metal is transferred to the injector and then the injector injects the metal into the mold. Metals with high melting points can be die casted by this process, but the disadvantage is it is slow than hot-chamber process.