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Copper is one of the first discovered metals. The largest use of copper is widely used in the electronics industry, such as the production of wires, cables and various electrical equipment. It is also used to make various alloys, such as brass (copper zinc K) and bronze medal ((copper Sn K). Copper and its alloys are used in the manufacture of various parts in the machinery and instrument industry, in the defense industry bullets, shells, and so on, in chemical heat exchangers, such as refrigerating devices. The casting process of copper alloy is mainly used for explosion-proof tools, moulds, structure of submarine cable augers, welding electrodes and so on. Cast tin bronze, cast aluminum bronze and cast brass are mainly used for shaft, sleeve, bushing, bearing, gear, fittings and so on. The copper alloy casting has been widely used in the arts and crafts. The ancient bronze ware is a typical example. Classification of performance transfer of copper alloy casting
Many different kinds of copper alloy, according to their chemical composition can be divided into pure copper, bronze (copper and tin, "Eyre, Si and Mn" CR "CD, zirconium titanium alloy elements, such as all signs, brass (copper zinc alloy, copper (copper, nickel and copper alloy Empire and special purpose; according to its function can be divided into general purpose and special purpose of two kinds of copper alloy; according to the state or the forming method, can be divided into cast copper alloy and deformed copper alloy. The main difference between the copper alloy casting and the deformed copper alloy is that the copper alloy casting is usually difficult to be plastic, whether hot or cold. (2) although some alloy elements, such as PI, Sn, Fe and Al, can be added to the deformation of the alloy, and can also be added to the casting of the copper alloy. Generally speaking, the addition of the copper alloy is more than that of the alloy. The elements added to the copper alloy castings are to improve the fluidity of the metal liquid, the casting structure or the strength. The addition of some elements in the deformed alloy may lead to poor processing performance. The content of impurities in copper alloy is higher. The conductivity of copper alloy casting is lower than that of the deformable alloy.
Classification of performance transfer of copper alloy casting
1. Tin bronze: the crystallization temperature range is large and the curing range is wide. Poor casting performance, easy to produce shrinkage, not easy to oxidize. It is characterized by directional solidification (sequential solidification) of thick wall parts, complex thin-walled parts and general wall thickness parts.
2. Aluminum bronze and aluminum brass: the crystallization temperature of the crystallization temperature range is small, the layer solidification characteristics. It is easy to form a concentrated contraction cavity and easy to oxidize. The process is made of aluminum bronze casting system for the bottom injection, and the aluminum brass casting system is used to open the open type.
3. Silicon brass: crystalline properties are between tin bronze and aluminum bronze. The casting performance is the best (with special brass). The process has the characteristics of continuous solidification, medium injection casting system and small size.