1, surface quenching
Commonly used surface quenching methods are high-frequency quenching (on the small-size gears) and flame quenching (on the large-size gears) two. Surface quenching is most effective when the hardened layer includes the bottom of the tooth root. Surface quenching commonly used materials for carbon mass fraction of about 0.35% ~ 0.5% of the steel, tooth hardness up to 45 ~ 55HRC.
2, carburizing quenching
Carburizing quenched gears with relatively maximum load-bearing capacity, but must be used in the finishing process (grinding) to eliminate heat treatment deformation, in order to ensure accuracy.
Carburized quenched gears commonly used before carburizing carbon mass fraction of 0.2% ~ 0.3% of the alloy steel, its tooth hardness is often in the range of 58 ~ 62HRC. If lower than 57HRC, the strength of the tooth surface decreased significantly, higher than 62HRC is brittle increase. The hardness of the heart of the gear tooth is generally 310~330HBW. Carburizing quenching gear hardness, from the surface of the gear teeth to the deeper layers should be gradually reduced, while the effective depth of carburizing provisions for the surface to the deeper layers should be gradually reduced, while the effective depth of carburizing provisions for the surface to the depth of the hardness 52.5HRC.
Carburizing quenching in the bending fatigue strength of gear teeth in addition to the role of the heart hardness has improved, but also in the surface of the residual compressive stress, it can make the maximum tensile stress area of the gear teeth stress reduction. Therefore, when grinding teeth can not grind the root part of the teeth, hobbing with a stay grinding hob.
3, nitriding
The use of nitriding can ensure that the gear teeth in the conditions of minimal deformation to achieve high tooth hardness and abrasion resistance, heat treatment can no longer be the final finishing, improve the load-bearing capacity. This is of special significance for internal gears that are not easy to grind.
4, meshing gear hardness combination
When the large and small gears are soft tooth surface, the small gear tooth hardness should be higher than the large gear. And when both wheels are hard surface and high hardness, then take the same hardness of the two wheels.
Selecting a good planetary gear reducer material is conducive to improving the bearing capacity and service life of the gear reducer.
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