当加工孔深超过四倍孔径时,普通钻头在钻削过程中需要经常从孔中退出,以便清除切屑和使冷却液进入孔底切削部位。这种啄木鸟式的进给方式使得钻孔效率低、深孔钻削周期长。枪钻能以较大的钻进速率高速钻孔,进给运动也不终断,孔径精度、圆度、直度和表面光洁度也较高。枪钻之所以具有良好的工作性能,是因为在枪钻上镶有硬质合金刀片并采用 When machining a hole deeper than four times the hole diameter, an ordinary drill bit needs to be constantly withdrawn from the hole during drilling in order to remove the chips and allow the coolant to enter the hole bottom cutting section. This woodpecker-style feed makes drilling inefficient, deep-hole drilling cycle length. Gun drill can drill at a high rate of drilling at high speed, feeding motion is not the end, aperture accuracy, roundness, straightness and surface finish is also higher. The reason why gun drill has good working performance, because the gun drill inlaid with carbide inserts and use