在普通车床上加工45钢无缝钢管油缸时(图1),珩磨前采用单刀加工,需经粗镗、半精镗和多次精镗。这样加工效率低,劳动强度大,精度与光洁度均不易达到珩磨前的工艺要求。为适应成批生产的需要,经研究试验制成如图2所示的扩孔镗刀。使用这种镗刀,可以一次加工成形。零件光洁度稳定在 In ordinary lathe machining 45 steel seamless steel cylinder (Figure 1), honing before the use of single-pole processing, subject to rough boring, semi-fine boring and fine boring several times. This low processing efficiency, labor-intensive, precision and finish are not easy to reach the honing process requirements. In order to meet the needs of mass production, the research test made of reaming bored knife shown in Figure 2. Use this boring tool, you can shape a process. Parts finish stable at