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The heat treatment process is (820±10) t:, heat preservation is lOmin, and then quenched in 10NaCl aqueous solution; at (560±20) 1C, heat preservation 90min, air-cooled tempering treatment , The measured hardness is within the range of 25~30HRC, which meets the hardness requirement of quenching and tempering.

The equipment used is GP100, which uses simultaneous heating and water spray cooling. The motor used for the induction induction hardening is a tapered inductor, and the gap between the inductor and the large end surface of the tooth is 2mm. The electrical parameters of the high-frequency heating used are shown in the following table. Off-frequency induction heating electrical parameter quenching equipment frequency anode voltage/kV anode current grid current heating time is tempered in the pit furnace. The tempering process is: heat preservation at (220±10) t for 60 minutes and then air cooling. The design shape and size of the tapered sensor are as shown.

Diamond (CBN)-cemented carbide composite spurs, as a new type of super-hard material products, are being continuously researched and applied in the fields of petroleum, geology, coal field mining and drilling, and have achieved good economic and social benefits. In order to further improve the wear resistance and impact resistance of super-hard composite spur teeth, and to surpass the world's advanced level, domestic scholars have launched a lot of research work. Most of these studies have focused on the structure, formulation and manufacturing process of composite spurs. But the optimization work of the sintering mold is rarely done. The rationality of the mold structure directly affects the quality of the sintering process.

Through production practice, high-frequency quenching of the bevel gear teeth is carried out using a tapered inductor. After tempering, the hardness of the tooth surface quenching is measured between 40~50HRC. The product quality is stable, which meets the production needs and product technical requirements.
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