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在加工零件上带退拔(锥度)的小孔时,采用如图所示的退拔铰刀来加工,既快且好。这种铰刀可根据加工零件的需要,自行制造,同时也可利用废料改制而成。有些时候,我们只钻好孔就用此绞刀直接加工,省去了扩孔的工序。它比普通退拔铰刀有如下优点:1)制造容易;2)能加工余量较大的孔,对不便使用铰刀的小孔(1～2毫米),其效果更为显见;3)由于是用单刃切削,用力较小,所以铰刀不易被楔紧,使用也安全;4)容屑槽大,因此加工面不易被铁屑挤伤;5)
In the processing of parts with a withdrawal (taper) of the hole, the use of reaming reamer as shown in the figure to process, fast and good. This reamer according to the needs of processing parts, self-made, but also can be used to transform waste. In some cases, we only drill holes and use this reamer to process directly, eliminating the need for reaming. It has the following advantages compared to ordinary reaming reamer: 1) easy to manufacture; 2) the hole with larger allowance can be machined, the effect is more obvious for the inconvenience of using reamer holes (1-2 mm); 3) Because it is a single-edged cutting, less force, so the reamer is not easy to be wedged, the use of safety; 4) chip flute, so the machined surface is not easily crushed by iron filings; 5)