The study of the relationship between diamond macro arrangement in drill bit and drilling performance is helpful for the design of orderly arranged diamond drill bit as well as for getting better understanding of fracture mechanism of the rock. ANSYSLSDYNA was used to simulate the rock drilling using flat impregnated diamond drill bit with three kinds of diamond arrangements, namely curved arrangement, ray arrangement and uniform arrangement. The effects of diamond arrangement on the drilling performance were observed. Indoor drilling tests were conducted on the brazed diamond drill bits with the aforementioned structures. The results showed that drill bits with curved arrangement of diamond had the best performance, followed by that with uniform arrangement of diamond, and finally that with ray arrangement. The results of indoor drilling tests are in perfect accord with those from numerical simulation.

diamond drill bit  /  drilling performance  /  curved arrangement  /  ray arrangement  /  uniform arrangement