Penetration and impact resistance of PDC cutters inclined at different attack angles

来源期刊：中国有色金属学报(英文版)2000年第2期

论文作者：李夕兵 D.A.Summers G. Rupert J. Tyler

文章页码：275 - 279

Key words：PDC cutters; penetration and impact resistance; rotary-percussive drill bits

Abstract: In order to develop a rotary-percussive bit with diamond-enhanced cutters assisted by high pressure water jets, it is necessary to study the damage mechanism and the penetration properties of PDC cutters subject to different impact load level and rock types. Therefore the impact experiments of the single PDC cutters with different attack angles in four rocks: black basalt, Missouri red granite, Halston limestone, and a very soft (Roubidoux) sandstone were carried out, and the effects of rake angles of PDC cutters on both the penetration and impact resistance of PDC cutters have been discussed in detail. Test results show that a PDC insert can withstand a very strong impact in compression but is easily damaged by impact shearing, the PDC cutters are more easily damaged by shearing if the attack angles are relatively small, the 45°PDC cutters have the least penetration resistance among the cutters tested. Thus it is suggested that the attack angles of PDC cutters should be larger than 30°for bits which must withstand impact from a hammer.