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Spring can be divided into tensile spring, compression spring and bending spring and so on, ordinary cylindrical spring
due to the manufacture of simple, and can be made into various types according to the load, simple structure, so the
most widely used.
Spring manufacturing materials generally should have high elastic limit, fatigue limit, impact toughness and good heat
treatment performance, etc. Carbon spring steel, alloy spring steel, stainless spring steel, copper alloy, nickel alloy and
rubber are commonly used. Spring manufacturing methods are cold and hot coil method. Spring wire diameter is less than
8 mm with cold coil method, larger than 8 mm with hot coil method. Some springs in the made but also for strong pressure
or shot peening treatment, can improve the bearing capacity of the spring.

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