工件上四方形孔及多角形孔(五角孔或六角孔等)的机械加工方法很多;可以用鉝刀鉝制,也可以在铡床上铡出。但前者制造刀具时比较麻烦,并且费用较大,须有一定的鉝制设備;而後者所制成的孔形,则准确性较差,加工时比较费时,并且太小的孔形便无法铡制。第三种比较简单而且相当准确的方法,就是本文所要介绍的,用方孔钻或多角形鑽来鑽制。这种方法在普通鑽床上便可採用,而鑽头的制造也不十分困难。现在—般机械加工上採用得颇为广泛。在立鑽上装以特种鑽孔装置,可在工件上进行 Square hole on the workpiece and the polygonal hole (pentagonal hole or hexagonal hole, etc.) machining methods; can trowel system, you can also 铡 out in the 铡 bed. However, the former is too cumbersome to make a tool, and it is more expensive and requires a certain amount of equipment. The latter hole shape is less accurate and time-consuming to process, and the hole size is too small铡 system. The third is a relatively simple and very accurate method, that is, this article is to introduce, with square hole drilling or polygonal drilling to drill. This method can be used in ordinary drilling machine, and the manufacture of bits is not very difficult. Now - general machining is used quite widely. In the vertical drilling installed special drilling device, can be carried out on the workpiece