三牙轮钻头啮合设计的新方法

New method for designing engagement of tricone bit

针对三牙轮钻头传统的二维啮合设计方法的低效率和二维啮合图的不真实性，开发出一个三牙轮钻头啮合设计新程序。利用新程序可对啮合图上的牙齿布置进行动态联动修改，画出真实啮合间隙分布图，还可进行真实啮合间隙的计算。计算结果表明，新程序啮合设计效率比手工方法提高２０～４０倍，比人机交互法提高６～１０倍，计算出的啮合间隙是真实可信的。

In the light of the inefficiency of the conventional 2 - D engagement design method for tricone bits and the untruth of the 2 - D engagement chart, a new Program for bit engagement design is develope. By using the new program, the teeth arrangement on the engagement chart can be movably modified and a true engagement chart can be drawu up, and the calculation of the true engagement clearance can be conducted. The result of calculation shows that the efficiency of the engagement design by the new Program is 20 ～ 40 times higher than that by the manual method, and 6 ～ 10 times higher than the hand-computer alternative method.