如今在鑽探工人中间有一种确切的见解,他们认为:用鑽头鑽进,凡能使工作面(孔底)成为阶梯状时,那么就能大大提高鑽进效率。关于阶梯状鑽头提高鑽进效率的问题,在已经刊载的许多作业报告中指出,利用这种鑽头鑽实心鑽孔和环状孔底的鑽孔时均能取得比较高的鑽进速度。阶梯状鑽头切削刃耐磨性比普通鑽头要高若干倍。使用这种鑽头比用普通鑽头所鑽取的岩层要粗一些,这表明了在鑽进过程中所需要的能量小。例如M·M兹烏庫洛夫的試驗證明,經他所設計的阶梯狀鑽头在砂頁岩中鑽进时,与普通镶硬合金的 Now there is a definite insight among the drilling workers who think that drilling with a drill bit can greatly increase the drilling efficiency when the working face (hole bottom) is stepped. The problem of stepped drill bits improving drilling efficiency has pointed out in many of the operating reports that have been published that a relatively high rate of drilling can be achieved with this type of drill while drilling solid and circular hole bottoms. Step-shaped drill bit wear resistance than ordinary bits to be several times higher. The use of such a drill bit is rougher than that drilled with an ordinary drill bit, indicating that the energy required during drilling is small. For example, M. Mzukulukov’s experiments show that when he designed the stepped bit to drill in sand shale,