针对目前牙轮钻头保径设计存在的问题，系统地分析了牙轮钻头的保径结构，提出了牙轮背锥临界保径线的新概念．根据牙轮背锥临界保径线的特殊性质，利用ＡｕｔｏＣＡＤ绘图软件包建立了镶齿钻头保径结构设计的计算机图解法和相应的计算机程序，为钻头保径结构设计提供了一种简便、直观、准确的新方法 Aiming at the problems existing in the design of the cone roller bit, the principle of cone roller bit is systematically analyzed and a new concept of the cone of the roller cone is proposed. According to the special nature of the cone-shaped cone of the roller cone, the computer graphic method and the corresponding computer program of the design of the guillotine-bit structure are established by using AutoCAD drawing software package, which provides a simple and intuitive , Accurate new method