在金属切削中钻孔刀具仍以高速钢麻花钻为主,效率低,切削速度只有20～30m/min。随着可转位刀片和涂层工艺的发展,国外在七十年代中期发展了可转位浅孔钻头(即V型钻头)。目前,美国、瑞典、西德、日本、英国和苏联等国对浅孔钻头都有自己的产品,结构各有特色,刀片有四边形、三边形和凸三边形等,它们大都带孔和带断屑槽,排屑槽的形状大都是直沟的,直径范围一般为φ20～φ60mm,长度是直径的3倍。 Drilling tools in metal cutting is still mainly high-speed steel twist drills, low efficiency, cutting speed of only 20 ~ 30m / min. With the development of indexable inserts and coating technology, transitive shallow hole drill bits (V-shaped drill bits) were developed abroad in the mid-1970s. Currently, the United States, Sweden, West Germany, Japan, the United Kingdom and the Soviet Union and other countries have their own products on the shallow drill bit, the structure has its own characteristics, the blade has a quadrilateral, triangular and convex triangular, most of them holes and With chipbreaker, chip flute shape is mostly straight groove, the diameter range is generally φ20 ~ φ60mm, length is 3 times the diameter.