Test research of drilling force for XYZ series rock bit;
XYZ系列岩石钻头钻削力试验研究
rock-bit interaction model
岩石-钻头互作用模式
rock-bit interaction
岩石与钻头互相作用
The vertical Interaction Model of cone Bit Teeth-rock
牙轮钻头牙齿与岩石垂向互作用仿真模型
Interaction Model between Formation and Bit during the Elliptic Distribution of Rock Drillability
岩石可钻性呈椭球型分布时地层与钻头相互作用模型
The Research of the Longitudinal Vibration in Cone Bits-rock System;
牙轮钻头与岩石互作用下系统纵向振动研究
drill ,interchangeable, of base metal, for rock drilling or earth boring
凿岩或钻土用钻头,贱金属制,可互换式
Study on Nonlinear Dynamics Action of Integrated Bit-Rock-Drillstring-Well System;
钻头—岩石—钻柱—井壁互作用下系统耦合非线性动力学研究
PREDICTION OF BOREHOLE TRAJECTORY BY INTERACTION MODEL BETWEEN DRILLING BIT AND STRATUM
用钻头与地层相互作用模式预测井眼轨道
drill ,interchangeable, of base metal, for hand or machine tolls (excl. those for rock drilling or earth boring)
钻头,可互换式,贱金属制,手工具或机床用（不包括凿岩或钻土用钻机）
A needle-shaped drill for boring holes in rock or masonry.
钻头，钻石器，钻孔器用于在岩石或砖石上钻孔的针形钻
ANALYSIS OF HOLE TRAJECTORY WITH BIT FORMATION INTERACTION MODELS
钻头与地层相互作用模型用于井眼轨迹分析
Nonlineaer Study on Dynamic Action of Integrated Drill String-Well Rock System;
钻柱结构与井壁岩石互作用下系统耦合非线性动力学研究
Research on Bionic Coupling Diamond Coring Bits in Drilling Hard Rock
硬岩钻进用仿生耦合金刚石取心钻头研究
diagonal cut rock drill plus bits
对角十字形岩石钻头
A form of opaque or dark-colored diamond used for drills.
墨金刚石一种不透明的或深色的钻石，用作钻（头）
Rock crushing simulation and cutting bit optimum design based on fracture and damage mechanics
基于断裂损伤的岩石破碎模拟与钻头优化设计
Research and Application of Diamond-impregnated PDC Bit or Drilling in Medium Hard Rock Formation
中硬岩层钻进孕镶金刚石复合片钻头的研究与应用
drill ,electric, hand-held (incl. rock drills)
电动钻具,手持式（包括岩石钻具）
