1) large diameter combined cone bit
大口径组合牙轮钻头
1.
Based on the practical cases undertaken by author,some problems in application of large diameter combined cone bits are discussed Suggestions on improvement of the bits are proposed in this pape
结合牙轮钻头的结构、性能、工作条件，分析了大口径组合牙轮钻头在使用中出现的问题，并提出了改正措施和建
2) tri-cone combination bit
三牙轮组合钻头
1.
00m with diameter φ700mm,using our own making φ700mm tri-cone combination bit carried out reaming operation after second hole-in target hitting.
00m、井径φ700mm,在二次成井中靶后利用自制φ700mm三牙轮组合钻头进行扩孔作业。
3) combined cone type cutting head
组合式牙轮钻头
1.
A brief introduction is made on the combined cone type cutting head with the rock fragmentation analysed, and comparison is conducted with the drag bit and the roller type cutting head in characteristics.
对组合式牙轮钻头作了简要介绍，分析了其碎岩原理，并与刮刀钻头及滚刁钻头进行了特性对比，阐述了设计、使用要点。
4) large diameter bit
大口径钻头
1.
The expert system for the design and proper use of large diameter bits is composed of the subexpert systems for the design and proper use of large diameter bits and a graphical data base.
大口径钻头设计与合理使用专家系统，由大口径钻头设计专家系统、大口径钻头合理使用专家系统、大口径电脑图库三部分组成。
5) cone bit design layout
牙轮钻头啮合图
6) roller bit
牙轮钻头
1.
Dynamic model of roller bit with nine degrees of freedom;
九自由度牙轮钻头动力学模型研究
2.
Computer simulation for the side-cutting of roller bits;
牙轮钻头侧向切削的计算机仿真
3.
Model to determine rock drillability by roller bit;
牙轮钻头可钻性级值的确定方法
补充资料：大直径牙轮钻头
大直径牙轮钻头
大““钻头篡
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条