Experiment and rock fragmentation mechanism of bionic coupling impregnated diamond bit

Bionic coupling theory was applied on design of the drilling bit in order to improve the drilling efficiency and the life of impregnated diamond bit,and the bionic coupling impregnated diamond bit was developed.Rock fragmentation mechanism was expatiated,and rock powders were analyzed.The results show that the drilling efficiency is increased by 42.7% and the life by 73.8% compared with the conventional impregnated diamond bit.Specific pressure on the bionic coupling bit's crown is increased,which is helpful to self sharpening of the bit and crack propagation of rock,and the micro flow field is generated because of the existence of non-smooth surface.The size of rock dust particles crushed by the bionic coupling bit is larger than that broken by ordinary bits.