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The bearing capacity of the gear manufacturer’s manufacturing materials and heat treatment process on the gear Aug 28, 2020

According to hardness, tooth surface can be divided into two types: soft tooth surface and hard tooth surface. Gears with soft tooth surfaces have low load-bearing capacity, but are easier to manufacture and have good running-in performance. They are mostly used in general machinery with no strict restrictions on transmission size and weight and small-volume production. Because the small wheel has a heavier burden among the matched gears, in order to make the working life of the large and small gears roughly equal, the hardness of the tooth surface of the small wheel is generally higher than that of the large wheel. Hardened gears have a high load-bearing capacity. After the gear is cut, it is quenched, surface quenched or carburized and quenched to increase the hardness. But in the heat treatment, the gear will inevitably be deformed, so after the heat treatment, grinding, grinding or fine cutting must be carried out to eliminate the error caused by the deformation and improve the accuracy of the gear. The commonly used steels for making gears are quenched and tempered steel, quenched steel, carburized and quenched steel and nitrided steel. The strength of cast steel is slightly lower than that of forged steel, and it is often used for larger gears; gray cast iron has poor mechanical properties and can be used in light-load open gear transmissions; ductile iron can partially replace steel to make gears; plastic gears are more versatile In places where light load and low noise are required, the paired gears generally use steel gears with good thermal conductivity.

Numerical simulation of the temperature field and flow field of the gear chamber die casting

Numerical simulations were carried out on the temperature field and flow field of the die casting of the gear chamber, combined with the results of physical and chemical analysis, to determine the nature and cause of the defects of the die casting; and the variability of the process was evaluated through statistical analysis, so as to quickly Obtain the law of casting defects. On this basis, the process optimization and quality control measures were put forward, and the implementation results showed that the casting hole defects were greatly reduced, and the expected effect was achieved.