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The early failure modes of the bevel gear mainly include tooth flanking and root fracture. The main reason for the two failures of the gear is that the gear is deformed during the carburizing process, which not only makes the gear movement accuracy and assembly precision lower. Moreover, the overall performance and service life of the gear are reduced, which is an important reason for the early failure of the gear.
There are many factors causing the deformation of the gear, especially the excessive austenite content of the carburized layer during the heat treatment, and the deformation of the retained austenite further transformed into martensite during the subsequent processing and use of the gear, which It is one of the most fundamental problems that cause the early failure of the bevel gear.
Through heat treatment analysis and practice, it can be found that a common feature of the early wear problem of the pumping gear reducer conical gear is that it has surface carbon deficiency during the carburizing process, which ultimately reduces the hardness and wear resistance of the gear. The optimal carbon content of the heavy-duty carburized gear surface is 0.85-0.95. The granular structure has the best wear resistance of the carbide structure. When the surface carbon content is less than 0.80, the wear resistance will be greatly reduced.
At present, most small and medium-sized enterprises in China still use well gas carburizing furnaces, kerosene and acetone as carburizing agents for carburizing of gears. During the entire carburizing process, the amount of carburizing agent added cannot be precisely adjusted according to the difference in carbon adsorption capacity of the part surface. Due to the different carburizing treatment, the absorption of activated carbon atoms by gears is different in different carburizing stages. The low carbon content causes the surface hardness of the gears to fail to meet the corresponding technical requirements, which makes the wear resistance of the gears decrease.