关键词: 钻头牙齿, 过盈配合, 接触问题, 计算机模拟, 有限元法

Abstract: The finite element mechanics Model of the Contact problems between the hole wall of cone and tooth of three-cone bit was established with the elastic-plastic contact finite element method,the simulator is ANSYS5.5 software.We analyzed the whole process of the tooth inserted the hole of cone,and draw out the dynamic load curves applied on the tooth varied with time and the difference between the diametars of the hole of cine and tooth.The paper analyzed the equivalent stresses of the hole wall varied with the inserted depth of tooth.The result shows that the near hole wall of cone began plastic deformation while the difference between the diameters of hole of cone and tooth exceeded 0.035mm.Finally,the results of computer simulation provided the theoretic wupport for the real inserted process,it is an important guidance meaning for the optimal design of the surplus contact of tooth.

Key words: tooth of three-cone bit, surplus contact, contact problem, computer simulation, finite element method