Casting application has a long history. Ancient people used as sacrificial utensil, casting coins, weapons, tools and utensils. In modern times, mainly used for machine parts casting blank, some precision castings, also can be directly used as parts of machines. Casting machinery products in the account for a large proportion, such as tractors, casting weight of about 50 to 70% weight of the whole machine, agriculture machinery accounted for 40～ 70%, machine tools, internal combustion engine for 70～ 90%. Various types of castings, machinery castings with complicated shape, most varieties, amount is the largest, accounting for about 60% of total production of castings. Followed by the metallurgical steel ingot mold and engineering pipeline.
Casting and daily life are closely related. For example, often use the door, door lock, radiator, water pipes, gas furnace, iron, iron and so on, are casting.
Casting classification
Casting a variety of classifications: according to the different metal materials, divided into cast steel, cast iron, cast copper, aluminum casting, magnesium casting, zinc, titanium casting parts. Each class of castings can be classified according to their chemical composition and metallographic structure is further divided into different categories. Such as cast iron can be divided into gray cast iron, nodular cast iron, vermicular cast iron, malleable cast iron, alloy cast iron; casting molding method according to the different, can be divided into ordinary sand casting, casting metal mold casting, die casting, centrifugal casting, continuous casting, investment casting, ceramic mold casting, Electroslag Remelting Casting, double metal castings. With ordinary sand castings for most applications, which is about all the casting yield of 80%. Aluminum, magnesium, zinc and other non-ferrous metal casting, pressure casting is.
