The present invention provides a chain saw chain wheel manufacturing method, its characteristic is: choose the reasonable composition of gear blank, complete the gear blank by ordinary powder metallurgy method, then the precision forging of gear blank closed chamber: gear blank immersion in the graphite coated graphite or under nitrogen protection, then rapid induction heating to 815-950 ℃, induction heating time should be less than 20 seconds, then quickly moved to the mould chamber closed forging, demoulding;After forging gear density greater than 7.7 g/cm3.Gear with wheel hub assembly, after we have processed the brazing and hardening one step in the furnace, brazing furnace with gas cooling system quickly, the protective atmosphere is given priority to with nitrogen plus a small amount of hydrogen, the sprocket phase transformation hardening occurred during gas quenching;After brazing hardening gear hardness can reach more than HRC58, wheel hub for gas cooled quickly improve the strength at the same time.To simplify the process, improve the production efficiency, reduce production costs, improve the machining precision and quality.
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