Piston ring is one of the main parts on the car, it contains gas ring and oil ring, when working, the piston ring will generate a lot of friction and internal stress, so it must have good wear resistance and corrosion resistance, in During the reciprocating motion of the piston ring, it can always ensure no oil and gas leakage, and has the characteristics of easy production and low friction coefficient. In terms of materials, we generally use alloy cast iron or steel. In the process, high-frequency induction heating equipment will be used to heat the piston ring.
The piston ring in a long-term working environment will have some failures, such as corrosion and wear caused by high temperature and high pressure gas medium, serious scratches between the cylinder liner due to poor lubrication, fatigue fracture caused by long-term reciprocating motion, etc. . The correct heat treatment process of piston rings includes stress relief annealing, quenching and tempering, heat setting, surface treatment, etc. The quenching temperature is 860 to 900 degrees Celsius, and the martensitic structure is obtained after cooling. Typically, piston rings are annealed after rough grinding the upper and lower ends, which eliminates machining stress and stabilizes size and accuracy. The shaped piston ring improves the structure, reduces the hardness of the matrix, eliminates the stress, and obtains a certain residual deformation. The piston ring after heat treatment by high-frequency induction heating equipment has improved wear resistance and heat resistance, and improved the running-in performance with the cylinder wall.
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