Process characteristics of Wuling cylinder liner
The cylinder liner should have sufficient strength, stiffness and heat resistance, and should also have good wear resistance. There should be excellent smoothness and cooling in operation.
The cylinder liner is generally made of wear-resistant alloy cast iron containing phosphorus or boron, such as HT25-47, HP-CuCrMo, etc. The inner surface of the cylinder liner is sometimes chrome-plated (pine hole chrome-plated, oil storage outlet chrome-plated), nitriding or phosphating to improve wear resistance. The hardness of the inner surface of the cylinder liner is generally required to be greater than HB200, and has an excellent match with the hardness of the piston ring. The inner and outer surfaces should also have appropriate roughness, so that it has a certain oil storage capacity and running-in performance. The inner and outer surfaces should have satisfactory roundness and cylindricity accuracy, and the center of the inner hole of the equipment support surface should have higher position accuracy.
The inner and outer surfaces of the cylinder are easily worn due to the effect of high temperature and high pressure gas and contact with the high-speed moving piston. In order to improve the wear resistance of the cylinder and extend the service life of the cylinder, there are different cylinder structure methods and surface treatment methods. There are three cylinder structure methods: no cylinder liner type, dry cylinder liner type, wet cylinder liner type.
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