图1所示零件,材料LY12-CZ管料(YB612-66),长度273毫米,孔径φ32毫米,要求光洁度▽7。过去采取扩孔、半精镗和精铰三道工序,加工工时约1小时,质量也不稳定。现采用自行研制的深孔镗刀,加工工时只需要5分钟左右,加工精度可达2级,锥度、椭圆度等误差均在0.01毫米之内,表面光洁度▽8。用这种镗刀加工同类材质的φ18×500毫米的工件,以及镗φ19×55毫米的台阶孔,同样取得了良好的效果。 Figure 1 shows the parts, materials LY12-CZ pipe material (YB612-66), length 273 mm, aperture φ32 mm, required finish ▽ 7. In the past to take reaming, semi-fine boring and precision hinge three processes, processing time of about 1 hour, the quality is not stable. The deep boring tool developed by ourselves is used. The working time is only about 5 minutes and the machining precision can reach 2 grades. The taper, ovality and other errors are within 0.01mm, the surface finish ▽ 8. With this boring tool processing of similar materials φ18 × 500 mm workpiece, as well as boring φ19 × 55 mm step hole, also achieved good results.