Today, advanced manufacturing represented by large ai […]
Today, advanced manufacturing represented by large aircraft, large power generation equipment, automobiles, high-speed trains, large ships, and large complete sets of equipment has entered an important direction of development. As a result, fasteners will enter an important stage of development. Bolts are used for the connection with important machinery. Repeated disassembly or various mounting torque methods require extremely high bolts. Therefore, the surface conditions and the accuracy of the thread will directly affect the life and safety of the host. In order to improve the coefficient of friction and avoid rust, bite or jam during use, the technical requirements stipulate that the surface should be nickel-phosphorus plated. The thickness of the coating is guaranteed within the range of 0.02 to 0.03mm, and the coating is uniform, dense, and free of pinholes.
Bolt materials: 18Cr2Ni4W, 25Cr2MoV steel; bolt specifications: M27 ～ M48. Because this kind of steel is easy to form a passivation film on the surface, and this passivation film will prevent the bolt on obtaining a good chemical nickel-phosphorus layer, so special pre-treatment measures must be taken to remove the film first, and measures should be taken Preventing its regeneration can ensure good bonding between the plated layer and the substrate. At the same time, due to the large geometry of the bolt, the quality of the nickel-phosphorus plating process and the process has increased difficulty.
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