Cemented Carbide Blades Wear Characteristics In Drilling LimestoneⅤ

3.2. Effect of the nozzle diameter on the wear rates of the cemented carbide blades

Bigger nozzle diameter means larger impact area and more impact force to the limestone, which helps to reduce the mechanical force on the blade and lessen the wear of it. Fig. 5 summarizes the effect of nozzle diameter on the wear rates of the cemented carbide blades under the water pressure of 30 MPa. It is showed that wear rates decrease with the increasing of the nozzle diameter of the drill bit.

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