To improve highway tunnel s rock stability classification,the authors introduced the drilling rock rate as included in the classical surrounding rock stability appraisal system,developed a new classification method based on improved back-propagation ANN and considering drilling rock rate.
为了有效的进行公路隧道围岩稳定性超前分类,将台车钻孔速率引入到围岩稳定性评价指标体系中,通过增加动量因子和设置自适应调整学习率的方法建立了改进型BP神经网络的围岩分类模型。
Effects of Microstructure and Drill Geometry of High-speed Steel Drill's Using Life;
高速钢钻头微观组织和几何尺寸参数对使用寿命的影响
Improvement of Drill Point Geometry for Drilling High Manganese Steel ZGMn13;
钻削高锰钢ZGMn13钻头刃形改进研究
Study on Carbide Drill Used to Drill ZGMn13 Turnout;
钻削ZGMn13高锰钢道岔硬质合金钻头研究
The Spindle System and Drills Dynamic Characters Study for High-speed Micro-drills;
高速微孔钻床主轴系统及钻头的动态特性研究
Load carrying ability of tapered roller bearing on new high speed rock bit
新型高速牙轮钻头圆锥滚子轴承承载能力分析
THE HIGH-SPEED ROLLER BIT BEARING SURFACE STRENGTHENING TECHNOLOGY
高速牙轮钻头轴承表面强化技术实验研究
Modeling and Appling of Drilling Speed of Cutting Type PDC Bit;
切削式PDC钻头钻速方程建立及其应用
This is jet bit and that is a PDC bit.
这是喷射式钻头，那是人造聚晶金钢石钻头。
High Speed Steel Compound Hammerhead and Its Performance
高钒高速钢复合锤头铸造工艺及其性能
STUDY ON END-BREAKING OF HIGH SPEED STEEL CAST CONSUMABLE ELECTRODE IN ESR PROCESS
电渣重熔过程中高速钢铸造自耗电极断头研究
Investigation of High-peed Milling of Hardened Cr12 Die Steel by Ball End Mills
球头铣刀高速铣削淬硬Cr12模具钢的研究
In a minute Jimmy's pet drill was biting smoothly into the steel door.
不一会儿，吉米心爱的钻头已顺利钻进了钢门。
In a minute Jimmy's pet drell was biting smoothly into the steel door.
不一会儿，吉来心爱的钻头已顺利钻进了钢门。
Research on Bit for Efficient Drilling of Gas Drainage Borehole in Nantong Mining Area;
南桐矿区瓦斯抽放孔快速钻进钻头的研究
Drag bits are used most commonly in soft formations.
在松软岩层中最常用的是钢砂钻头。
unit-type drill head
组合钻床钻头, 标准钻头
Experiment to Improve Chip Breaking Performance of Drill Tip in Stainless Steel Drilling
不锈钢钻削中提高钻尖断屑性能的试验研究
Experimental Research on Carbide Drill with Multi-facet for ZGMn13 High Manganese Steel
硬质合金群钻钻削ZGMn13高锰钢的实验研究