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

 The heat treatment deformation of the driving and driven bevel gear directly affects the precision, strength, noise and life of the gear. Even in the process of carburizing heat treatment and gear grinding, the deformation still needs to reduce the precision level of the gear, and there are many factors that affect the deformation of carburizing heat treatment. Only by controlling various factors can the deformation be controlled to a small degree, 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 effect of heat treatment on gear deformation, the normalizing hardness is too high, and a large number of sorbite or Wei structure mixed crystals will increase the deformation of the inner hole, so it is necessary to control normalizing or isothermal annealing to process forgings.

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

4. The effect of quenching on gear deformation, quenching cooling behavior is an important factor affecting gear deformation, oil quenching deformation is small, generally controlled at 100°C ± 120°C oil cooling capacity is also very important, stirring method and strength will affect deformation. Hubei Axle Heat Treatment All driven bevel gears are quenched with an upper quenching press to adjust the internal, control deformation, reduce the pressure and size of the outer tooth mold and core block of each section of fuel injection, and the deformation of the upper working surface.

5. The clamping method and the 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 deformation of the main bevel gear.

6. Machining cooperation: ① master the heat treatment deformation law, move the position of the tolerance zone, and 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 asymmetry or thickness Uneven parts adopt the method of reserved processing amount, and then process after heat treatment. ④ After heat treatment, use a push knife to finish the spline hole, heat the sleeve mandrel after carburizing and quench it, and then press out the mandrel to ensure the size of the spline hole of the active bevel gear and reduce deformation.