近来，许多地质队广泛采用了密集式硬质合金钻头钻进中硬及硬岩石（五—八级、部分九级），都获得了较高的机械钻速，较好的经济效果。这充分证明：要在中硬及硬岩石中提高钻进效率，有效地保持孔内清洁，减少钻粒钻进的辅助工序，以扩大硬合金使用 Recently, a large number of geological teams have adopted intensive carbide drill bits to drill hard and hard rocks (5-8 grades, some 9 grades), all achieving higher ROP and better economic results. This fully proves that it is necessary to improve the drilling efficiency in medium and hard rocks, effectively keep the holes clean, and reduce the auxiliary processes for drilling the drilling stones to expand the use of hard alloys