下排屑精扩孔钻

• 出 处: 机械工人.冷加工
• 发表日期: 1983年09期
• 关键词: 扩孔钻 排屑 切屑 面排 切削刃 通孔 刃倾角 麻花钻 精孔 副切削刃

下排屑精扩孔钻,是在粗加工通孔后,留较少切削余量,用扩孔办法加工精孔的一种钻头。它改变了标准麻花钻的切削角度,在外刃和修光刃上磨出前角,形成了正的端面刃倾角,控制了切屑流出的方向。在钻头对通孔进行扩孔时,切屑离开刃口,也就是切屑被切削刃切去后,立即向已加工孔的下面排出,而不是靠切屑的重量压下去,使

The lower extrusive reaming drill, after roughing the pass, leaving less cutting allowance, reaming method with a hole drilled a bit. It changes the cutting angle of standard twist drills, rakes the rake angle on the outer edge and wiper edge, creating a positive end edge rake angle that controls the direction of chip flow. When the drill drills the through hole, the chip leaves the cutting edge. That is, the chip is cut off by the cutting edge and immediately discharged to the under-machined hole instead of being pressed by the weight of the chip.