前言 我国各工厂对小直径(0.2～1公厘)钻头的耐用度、切削速度及进给量多半是由工人凭经验来选择的,而不是按最有利的切削用量来钻孔。这样,不但生产率低,而且往往在不恰当的切削用量下,会使钻头提早磨钝,甚至折断。当然,这是由于过去没有适当的切削用量资料可查所致。因此,特? Foreword In China, the durability, cutting speed and feed rate of small diameter drill bits (0.2-1 mm) are mostly chosen by the workers by experience rather than drilling at the most favorable cutting rates. In this way, not only is the productivity low, but often the amount of cutting is not appropriate, the drill bit will be blunt or even broken. Of course, this is due to the fact that there is no proper amount of cutting data in the past. So, especially?