This paper proposes improving measures according to the problems in the procedure of drilling the blue bind formation using the three-winged drag bit.
针对三翼钻头在硬粘土地层的钻进所遇到的问题提出了改进措施 ,对去掉护圈、改变副吸渣口形状 ,调整前角角度、切削齿的排列等问题进行了探讨 ,基本解决了三翼钻头易糊钻、钻速缓慢的两大难题。
carbide-tipped Morse taper shank drill
硬质合金莫氏锥柄钻头
carbide taper shank twist drill
硬质合金锥柄麻花钻
A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
钻头曲柄、钻柄或钻床之上用于钻孔的尖头工具
A small conical hole made in a piece of work with a center punch so that a drill can be accurately positioned within it.
中心孔，转柄孔在带中心冲头的工件上为使钻头准确放置而做的小锥形孔
carbide welded taper shank twist drill
硬质合金焊接式锥柄麻花钻
carbide welded taper shank core drill
硬质合金焊接式锥柄扩孔钻
cone type roller bearing rock bit
滚柱轴承锥形牙轮钻头
An awl with a beveled tip, used to make holes in wood for brads or screws.
锥钻，打眼钉钻头倾斜的钻子，用于在木头上钻孔以钉角钉或螺钉
a drill consisting of a bit and a brace to hold and turn it.
有钻头和可以握住和旋转的手柄的钻机。
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 cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press.
钻机的切割部分；通常是尖头的有螺旋状图案并且可以更换，用在钻柱钻柄或钻床上。
A small hand tool having a spiraled shank, a screw tip, and a cross handle and used for boring holes.
手钻一种小的手工工具，有螺旋尖头，带槽纹的钻身，横装的手柄，作钻孔用
"The drill may be gripped in a chuck with three jaws that move radially in unison, or it may have a tapered shank that fits into a tapered hole in the spindle."
钻头可被一具有三钳的夹头控制,或是钻的推拔柄正可插入转轴的推拔孔中。
spiral flute machine reamer with taper shank
锥柄螺旋槽机用铰刀
small module taper shafted straight tooth slotting cutter
小模数锥柄插齿直齿刀
carbide machine reamer with taper shank
硬质合金锥柄机用铰刀
Morse taper shank keyway cutter
莫尔斯锥柄键槽铣刀
a cranklike handle with an adjustable aperture at one end for securing and turning a bit.
一种在一端带有可调节的孔以抓住和转动钻头的曲柄状把手。
