Cemented Carbide Blades Wear Characteristics In Drilling LimestoneⅠ

Drilling hard rock with water jet is considered to be an efficient way to improve the work life of the cemented carbide blade. In this paper, cemented carbide material YG-6 is used on the drill bit in limestone drilling with water jet. Wear characteristics of the cemented carbide blades in drilling limestone with water jet is studied. Experiment results showed that the water jet pressure and nozzle diameter played an important influence on the wear rates of the cemented carbide blades in the drill bits.

The wear rates of YG-6 blades decreased when the jet pressure increased. But the decline speed of wear rates was not eve n, it declined more and more s lowly when t he jet pressure upon 10 M Pa. It w as also showed that wear rates decrease with the increase of the nozzle diameter in the drill bit , for the bigger nozzle diameter could provide  more impact force which could reduce the mechanical force on t he YG-6 b lades. SEM photographs were taken to characterize the wear mechanism of the cemented carbide blades in limestone drilling with water jet. Surface analysis demonstrated that cemented carbide blades in limestone drilling with water jet showed circular action of brittle fracture, grain pullout and polishing, which induced material removal process.

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