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1·Diameter controlling is of great importance in rock bit manufacturing.

保证三牙轮钻头的直径是钻头制造工艺的重点。

2·Water jet flow is one of the decisive factors for drilling rate during rock bit drilling.

在牙轮钻头的钻进中，水射流是钻进速度快慢的决定因素之一。

3·A new type rock bit with bearing liner structure has been developed and tested on the spot.

研制了一种新型的镶套轴承结构牙轮钻头，并进行了现场试验。

4·Assemble inserts and cones respectively, and prepare for calculating 3d engaging distance of tri-cone rock bit.

对牙轮和牙齿分别进行了装配，为三维啮合间隙计算做了充分准备。

5·There are many causes inducing rock bit cone break, in which the effect of its machining on the cone is more serious.

造成钻头牙轮破裂的原因是多方面的，其中钻头机加工对牙轮开裂的影响较大。

6·The dynamic model reveals the dynamic action of string, it is instructive to design new rock bit and study drilling mechanics.

通过研究得出了一套研究钻柱系统动力学模型及求解方法，对新形钻柱的设计和钻井力学的研究具有指导意义。

7·With 20 rock bits which used in the field, bearings surface metallography, rigidity, and the main factors influence the life of the rock bit journal bearings were studied.

收集了近几年20只现场失效牙轮钻头，对其轴承表面金相组织和硬度以及影响牙轮钻头滑动轴承失效的主要因素进行了分析。

8·With 20 rock bits which used in the field, bearings' surface metallography, rigidity, and the main factors influence the life of the rock bit journal bearings were studied.

收集了近几年20只现场失效牙轮钻头，对其轴承表面金相组织和硬度以及影响牙轮钻头滑动轴承失效的主要因素进行了分析。

9·The structure of tri-cone rock bit is complicated. As the cutting structure touch the stratum directly, it affects the process of breaking rock and the performance of tri-cone rock bit.

三牙轮钻头结构复杂，其中齿面结构直接与地层接触，对于岩石破碎过程和钻头工作性能的影响最大。

10·On the basis of the interaction model between formation and rock bit, a lateral vibration dynamic model of the rock bit was established under the interaction between drilling string and rocks.

在建立牙轮钻头与井底岩石互作用模型的基础之上，建立了基于钻柱和岩石互作用下的牙轮钻头横向振动动力学模型。