Gun drills. Gun drills are used for drilling deep holes. All gun drills are straight-fluted, and each has a single cutting edge. A hole in the body acts as a conduit to transmit coolant under considerable pressure to the tip of the drill.
深孔钻。深孔钻用于钻深孔。所有深孔钻都是直出屑槽的并且均为单切削刃。钻头体中有个孔作为导管在相当大的压力下将冷却液传送到钻头顶端。
There are two kinds of gun drills, namely, the center-cut gun drill used for drilling blind holes and the trepanning drill. The latter has a cylindrical groove at its center, thus generating a solid core, which guides the tool as it proceeds during the drilling operation.
深孔钻有两种类型?即用于钻盲孔的中心切削深孔钻和套孔钻。后者在其中心有一圆 柱形沟槽?这样能生成整体芯在钻孔作业过程中引导钻头。