4. Conclusions
This paper investigates wear characteristics of the cemented carbide blades in the process of drilling limestone with water jet. The wear mechanism of the blades when water jet is employed in rock drilling process is also studied. The conclusions could be summarized as follows:
1. The pressure of water jet plays an important role in the wear rates of cemented carbide drill bits in rock drilling with water jet. The wear rates decrease with the increasing of the jet pressure. But the decline speed of wear rates is not even. It declines more and more slowly when the jet pressure is over 10 MPa
2. Reasonable nozzle structure can improve the wear resistance of the cemented carbide blades. Moreover, increasing the diameter of the jet nozzle could decrease the wear rates of blades.
3. Surface analysis demonstrated that cemented carbide blades in limestone drilling with water jet shows circular action of brittle fracture, grain pullout and polishing, which induces material removal process.
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