钻头

Series hd high air-press dth are designed as a hammer drill. they differ from other rock drills, however, through continuous operation down against the drill bit.

hd系列高风压冲击器是一种冲击凿岩工具，但他与其它凿岩工具不同的是，凿岩过程中它始终留在孔的底部，活塞直接冲击钻头。

Refer to the diagram, draw the locations of screws on hand winch, angle turner, double-wheel stand top, single-wheel stand top, and drill holes with 8mm percussive drill.

根据阳台结构选择方案 A 或 B （如左/或右有墙，可选 A ，若只有背面墙，可选 B ）。2、参考图示，画出手摇器、转角器、双轮顶座、单轮顶座的螺丝孔位，用8MM 钻头打孔。

The universal index head is provided at 24 positions so that any particular angle of shape can be obtained, free 3600 or 100 rotation is allowed for grinding End Mills、Twist Drill、Lathe Tools, only replace the attachment to the index head without any complex setup.

磨削分度头可在24种位置下操作以便于磨削任何角度和形状，只需替换分度头上的附件而不需任何复杂的步骤就可进行立铣刀、雕刻刀、钻头、车刀、球头立铣刀的磨削。

Through comprehensive applications of many key projects,such as well location optimization technology,mixed oil drilling technology combined with using popularized PDC bit s of high efficiency and high torque and low-velocity hobs of great power, deep well bore contro.

通过井位优选技术、推广高效 PDC 钻头和大功率高扭矩低速螺杆的复合钻井技术、深井井身控制技术、以防漏堵漏为主的调整井钻井技术等各项攻关课题的综合应用，形成了一系列的深井优快钻井综合技术，大打钻井科技攻坚战，取得了钻井速度的新突破。

At the same time ,it analyses the possible interference phenomenon that can be occurred in the course of machining drill bit flute by the grinding wheel cross-sectional profile solved.

同时分析了在用所求得的砂轮截形加工钻头螺旋槽的过程中可能产生的干涉现象。

20CrNiMo steel can be matched as the materials for the cone and jaw of KX-250 tri-cone bit.

KX-250三牙轮钻头上的牙轮牙爪可选用20CrNiMo钢锻造，但20CrNiMo牙轮牙爪在锻造过程中产生的缺陷严重影响产品的力学性能。

The load on journal bearing and loads on each row are described.

对牙轮钻头滑动轴承受的载荷以及齿圈载荷分布也进行了描述

Guiding parts, mandrels, calibration rolls, knives, plate cutters, inserts for percussion drills, masonry drill tips, calibration bushes, drawing cheeks, shearing knives, inserts for golfer shoes.

导向部分、心轴、校准轧辊、刀片、倒盘、冲击钻机的衬垫、钻机钻头、校准衬套、拉模夹具、剪刀、高尔夫鞋的衬垫。

RG10 RG20 Guiding parts, mandrels, calibration rolls, knives, plate cutters, inserts for percussion drills, masonry drill tips, calibration bushes, drawing cheeks, shearing knives, inserts for golfer shoes.

导向部分、心轴、校准轧辊、刀片、倒盘、冲击钻机的衬垫、钻机钻头、校准衬套、拉模夹具、剪刀、高尔夫鞋的衬垫。

Rock drillability index is a very key parameter in selection of drill bit type and determination of productivity in petroleum, mining and geology. Unfortunately, there are many limits in the current definition as well as experimental methods.

岩石可钻性指标是石油、矿山及地质部门广泛用于钻头选择和制定生产定额的重要参数，但现行可钻性指标的定义及参数获取的实验方法还存在许多问题。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。