本文用平面光弹方法，对阶梯金刚石钻头切削刃下岩石的应力进行分析。
Rock cutting by a step ped bit has been studied with experimental stress analysis and is tested under atmospheric pressure.
探讨了获得钻削碳纤维复合材料高质量孔的两个关键因素：保持钻头切削刃的良好锋利性和采用高的钻削速度。
Two key factors for drilling high quality holes of carbon fibre reinforced plastics, which are to keep the fine sharpness of the cutting lip of the drill and to use high drilling speed are discussed.
集中论述了在实际微孔钻削加工过程中主切削刃对微钻头折断和微孔加工精度的影响。
This article focused on drilling in the actual processing of microporous main cutting edge of micro-drill breaks and microporous processing accuracy.
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