What is the influence of heat treatment deformation of master and slave bevel gears?

2022/12/23 10:22

The heat treatment deformation of the driving and driven bevel gear directly affects the precision, strength, noise and service life of the gear. Even after the carbon heat treatment and gear grinding process, the deformation still needs to reduce the precision level of the gear, and there are many factors that affect the deformation of the carbon heat treatment. Only by controlling various factors, the deformation can be controlled to a small extent, and the control of gear deformation must be solved in the whole process of manufacturing gears.

1. The influence of gear material metallurgical factors on deformation, the higher the hardenability of steel, the greater the deformation.

2. Preparing for the influence of heat treatment on gear deformation, the normalizing hardness is too high, and a large amount of sorbite or Wei structure will increase the deformation of the inner hole, so forgings need to be controlled for normalizing or isothermal annealing.

3. The higher the influence of the carburizing process on deformation, temperature, carbon layer and cooling medium temperature, the thicker the carburizing layer and the lower the oil temperature, which will affect the deformation of the driving bevel gear.

4. The effect of quenching on gear deformation. Quenching and cooling are important factors affecting gear deformation. Hot oil quenching is smaller than cold oil quenching, generally controlled at 100°C ± 120°C The cooling capacity of the oil is also very important, the mixing method and strength will affect the deformation. Hubei Axle Heat Treatment All driven bevel gears are quenched with an upper quenching press to adjust the internal and control deformation, reduce the pressure of the external tooth mold and core block, as well as the size of the injection volume of each section and the deformation of the working surface.

5. The way and size of the fixture make the heating and cooling of the workpiece uniform, the carburized layer of each part of the workpiece is uniform, reduce the uneven thermal stress and tissue stress, and reduce the main deformation of the bevel gear.

6. Machining cooperation: ① Master the deformation law of heat treatment to improve the product qualification rate; ② According to the deformation law, use anti-deformation and shrinkage end pre-expansion holes to improve the deformation qualification rate after quenching; ③ For parts with asymmetry or uneven thickness, use Reserve the processing method and process after heat treatment. ④ After heat treatment, use a push knife to finish the spline hole. After carburizing, heat the mandrel to quench and press out the mandrel to ensure the size of the spline hole of the active bevel gear and reduce deformation.

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