【摘要】 从分析三牙轮钻头的磨损和抗磨损机理入手，提出了牙轮轮背全形保径面的概念。给出了采用计算机辅助计算方法得到的牙轮轮背理论曲线方程、形状坐标值、图形和两种背齿的设计方案。探讨了牙轮轮背设计与钻头基本参数、整体结构和性能的关系，以及采用轮背全形保径后热量及受力对钻头轴承的影响。更多还原

【Abstract】 Based on the analysis of the wear and antiwear mechanism of a three-cone bit, this article puts forward an idea of full-contour gage surface of bit cone back, presents its theoretical curve equation. coordinate values and geometric figure by CAD, introduces the design scheme of two kinds of back teeth, makes an investigation in the relationship between the cone back design and the bit’s basic parameters, structure and functions, and explores the influences of heat and force on the bearings of a bit with full-contour gage surface.更多还原