Ø76 mm小直径钢齿三牙轮钻头设计

Design of Ø76mm steel tooth tricone bit

针对小口径不取心钻孔,开展了Ø76 mm钢齿三牙轮钻头规范性的系统设计。本文参考国产石油三牙轮钻头结构设计参数取值,设计了Ø76 mm钢齿三牙轮钻头结构参数值,校核了牙轮钻头计算直径。系统介绍了井底击碎图和齿圈啮合图的绘制方法,并对铣齿牙轮的齿圈布置进行了优化。采用非密封滑动轴承结构,钢球锁紧牙轮,对滚珠轴承进行了设计计算,确定了滚珠数量、滚道尺寸及间隙。精确计算了楔形齿的相关参数,确定了铣刀角和铣刀安装角。阐述了小直径钢齿三牙轮钻头的零件细节、加工工艺。利用Excel函数运算功能和三维参数化实体模拟软件,解决了牙轮钻头传统的繁重的手工计算和繁琐的二维投影手工绘图的问题,提高了设计效率和设计精度,为类似牙轮钻头的设计提供了借鉴。

Normative system design ofØ76mm steel tooth tricone bit was carried out,aiming at the small diameter non‑coring drill.The paper designed the value of the structure parameters and checked the calculated diameter ofØ76mm steel tooth tricone bit,referring to the value of structure design parameters of domestic petroleum tricone bits.The drawing method of crushing‑diagram at the drilling‑hole bottom and gear ring meshing‑diagram,as well as the optimization method for the tooth ring arrangement of milling tooth cone are introduced systematically.Using steel ball to lock cone,with the unsealed sliding bearing structure.And the ball bearings are designed and calculated,to determine the number of balls,rolling track size,and clearance.The parameters of wedge teeth are calculated accurately,to determine the angles and installation angles of the milling cutters.The part details and processing technology of small diameter steel tooth tricone bit are described.The problems of the traditional heavy manual calculation and cumbersome 2D projection manual drawing have been solved,by utilizing Excel functions and 3D parameterized solid simulation software,improving the design efficiency and accuracy,to provide a reference for the design of similar roller cone bit.