Abstract: The causes of tooth fall-off of insert rock bit were analyzed through experiments. The geometrical condition of insertion of carbide tooth into the cone hole was derived and the methods of defining each physical quantity in the above expression were given. Mechanical criteria such as measures of press fit between carbide insert and cone hole were put forward, by means' of these results the critical condition of the magnitude of interference was determined. This work provides a theoretical and practical method of design for the carbide insert and cone body.

摘要： 本文提出了镶齿钻头的掉齿机理假设,由此导出了固齿的几何条件,以及条件式中各物理量的确定方法,同时还提出了度量固齿牢固程度的力学指标,由此导出了过盈量的临界条件,从而为镶齿钻头的镶齿参数设计提供了理论的根据和实用的方法。