rock bit 岩石锧头 ; 岩石钻头 ; 凿岩钻头
tricone rock bit 三牙轮钻头 ; 三维式岩石钻头
cone rock bit [机] 锥形凿岩钻头
insert rock bit 镶硬合金齿牙轮钻头
rock-bit interaction 岩石与钻头互相作用
rock bit testing rig 牙轮钻头试验钻机
sealed bearing rock bit 密封轴承牙轮钻头
Tri-cone rock bit is the important tool in oil drilling,so its capability and quantity affect the speed and cost of oil drilling greatly.
三牙轮钻头是石油钻井的重要工具，其性能和质量对钻井速度和成本影响很大。
参考来源 - 基于PRO/E的三牙轮钻头CAD系统的研究与开发How to improve the working performance of rock bit journal bearings (RBJB) and prolong its life span under high working speed is one of the urgent problems faced by oil drilling engineering.
如何提高现有牙轮钻头轴承的工作性能，延长其在高转速下的使用寿命，是目前钻井工程领域迫切需要解决的问题之一。
参考来源 - 牙轮钻头浮动套轴承工作机理研究·2,447,543篇论文数据，部分数据来源于NoteExpress
By using strict mechanical analysis and mathematical treatment, three rock-bit interaction models reported in literature are analyzed.
本文通过力学分析与数学推导，对已有的三种钻进模型进行了分析推理。
It still is a difficult subject for most drilling engineers to predict and control well path by applying the mechanical analysis of bottom hole assembly and the rock-bit interaction model.
利用下部钻具力学分析和钻头与地层相互作用模型来预测和控制井眼轨道对于大多数钻井作业来说仍是一个难题。
We've already talked a bit about the growth of extreme sports like rock-climbing.
我们已经讨论了一些攀岩等极限运动的发展。
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