关键词: 金刚石钻头, 切削刃, 阶梯形, 阶梯刮刀钻头, 破岩过程, 合理结构, 自由面, 破岩方式, 拉应力, 脆性岩石

Abstract: Rock cutting by a step ped bit has been studied with experimental stress analysis and is tested under atmospheric pressure.The results show that step ped bit cut rocks with tension and shearing,so this bit is more efficient than others.The force on the cutter is not well-distributed The width and height of each step and the width-height ratio are the major factors influencing drilling rate.