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在机械加工中,经常会遇到多边形内孔的加工,特别是四方孔和六方孔。对于通的多边形内孔,在尺寸较大的情况下,经过钻孔后可根据划线在插床上加工。但是对于尺寸较小或不通的内孔(在没有空刀的情况下,若有空刀时,则可在插床上加工),则无法在插床上加工。对于这样的内孔,过去在一般工厂中的制造方法有下列几种:(1)在钻孔以后根抿划线用钳工锉,这种方法对于小尺寸的另件用得极为普遍。它的缺点是需要很多的钳工工时,同时亦是一个复杂的手工操作。(2)在钻孔以后,根据划线在立铣床上铣,铣后用钳
In machining, often encounter the processing of polygonal inner hole, especially the square hole and hexagonal hole. For through the polygon bore, in the case of larger size, after drilling according to scribe in the slot machine processing. However, for small or non-through bore (in the absence of an empty knife, if there is an empty knife, it can be machined on the bed), it can not be machined on the bed. For such internal bores, the following methods have been used in the general factory in the past: (1) Submerging the file with a fitter after drilling, this method is very common for small size parts. Its disadvantage is that it requires a lot of fitter work hours, but also a complicated manual operation. (2) After drilling, milling according to the scribing line in the milling machine, after milling with forceps