Study on the Mechanism of Rock Fragmentation of Bionic Integrated High Working Layer Impregnated Diamond Bit

Abstract

This study aims to enhance impregnated diamond bits' drilling speed and bit life. This paper takes the claw toes of cave-digging animals as the bionic prototype and analyses the structure of the claw toes of the pangolin and the law of breaking ground. Then the design of the bionic integrated high working layer impregnated diamond bit(BIHB) has been completed. The finite element numerical simulation software was used to simulate the two-dimensional extension model of rock cracks, the three-dimensional process of rock fragmentation, the morphology of the hole bottom, and the influence of tooth unit structure on the force of drill bit teeth. An investigation was conducted to compare the BIHB and the conventional impregnated diamond bit in terms of crack expansion, stress distribution, bottom morphology, and drilling speed. Revealed the mechanism of BIHB to increase drilling speed and prolong bit life. Field experiments and micro-drilling experiments have been carried out to verify that the BIHB can improve the efficiency of rock crushing and increase the bit life.

Keywords: Bionic, High working layer, numerical simulation, Rock crack propagation, Rock-breaking mechanism