Surface quenching common surface quenching methods are high-frequency quenching (for small size gear) and flame quenching (for large size gear).When the surface hardened layer reaches the bottom of the tooth root, the hardness can reach 45-55hrc.

Overall quenching, also known as thorough quenching, is the workpiece from the surface to the heart of the hardening of all.The whole quenching includes heating, heat preservation and cooling.Heating and heat preservation are important links that affect the quality of quenching.Heating temperature selection should be adjusted according to the specific situation, the purpose of insulation is to make the workpiece internal temperature uniform tends to be consistent.The cooling stage is not only to obtain reasonable structure of the parts to achieve the required performance, but also to maintain the size and shape accuracy of the parts, which is the key link in the quenching process.


    After carburizing and quenching, the gear has a relatively large bearing capacity, but the finishing process (gear grinding) must be used to eliminate heat treatment deformation to ensure the accuracy.The adoption of nitriding can ensure the gear surface hardness and wear resistance of high gear surface under the condition of minimum deformation.

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