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牙轮钻机是采掘工业中一种比较先进的钻具,其中钻头是易损件。我院对牙轮钻头的结构、选材和热处理工艺进行了一些改进,使其平均使用寿命从二百米提高到八百多米,最高达一千三百米。牙轮钻头由牙轮体、牙爪、衬套、滚珠、滚柱、止退块和塞销所组成。钻头在钻进过程中,牙爪和滚动体主要承受多次冲击压缩-接触疲劳负荷。同时,轴承受到岩渣的磨粒磨损作用,轴颈还受到弯矩的作用。其中牙
Drill cone is a more advanced drill tool in the mining industry, where the drill bit is a wearing part. In our hospital, some improvements have been made to the structure, material selection and heat treatment of roller cone drill bits, raising the average service life from 200 meters to over 800 meters and up to 1,300 meters. Tricone bit by the roller body, claws, bushings, balls, rollers, stop block and stopper pin formed. Drill bit during drilling, claws and rolling mainly bear multiple impact compression - contact fatigue load. At the same time, the bearing is affected by abrasive wear debris, journals also by the role of bending moment. One tooth