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What processing factors of gears will affect the deformation?

Published Date:09-17-2020    Source:    Author:  Viewed:189
dness is higher than 40HRC, the deformation will increase significantly. Therefore, there are certain requirements for the hardenability of steel. The narrower the hardenability band is, the more stable the deformation will be. The steel factory should provide "low and stable deformation" steel. The A1/N content ratio is controlled in the range of 1~2.5, which can narrow the hardenability zone and reduce deformation. In addition, the square segregation and banded structure of the material affect the uneven deformation and carburization of the gear spline hole.



2. Effect of preliminary heat treatment on gear deformation



Too high normalizing hardness, mixed crystal, a large amount of sorbite or widmanstatten structure will increase the deformation of the inner hole, so it is necessary to use temperature control normalizing or isothermal annealing to treat the forgings.



3. Effect of carburizing process on deformation



Temperature uniformity, carbon layer uniformity and cooling medium temperature uniformity all affect gear deformation. At the same time, the higher the carburizing temperature, the thicker the carburizing layer, the lower the oil temperature, and the larger the gear deformation. Therefore, it is necessary to improve the equipment, optimize the process and improve the quality of gear heat treatment.



4. Effect of quenching on deformation



Quenching cooling behavior is the most important factor affecting gear deformation. The deformation of hot oil quenching is smaller than that of cold oil quenching, which is generally controlled at 100 ℃ ± 120 ℃. The cooling capacity of oil is also crucial to the deformation. The mixing mode and intensity affect the deformation. For the plate gear quenched by the upper quenching press, according to the deformation of various gears, adjust the parameters of the punching press to reduce the deformation, and adjust the pressure of the inner and outer die and the expansion block, as well as the size of the oil injection at each section and the upper working table to control the deformation.
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