我厂曾遇到图1所示小直径缸体的加工,缸体长700mm,内孔φ42_0~(+0.12)mm,材料45钢,内孔表面粗糙度R_a1.6,硬度220～260HB。由于我厂镗刀头及珩磨头没有这种规格,而加工任务又急。为此,为确保图样要求,我们采用立铣刀代替铰刀精镗内孔,加工前,将立铣刀进行了几何角度刃磨修正,试铰后进 I plant has encountered the small diameter cylinder shown in Figure 1 processing, cylinder length 700mm, the hole φ42_0 ~ (+0.12) mm, material 45 steel, the hole surface roughness R_a1.6, hardness 220 ~ 260HB. As I plant boring head and honing head no such specifications, and processing tasks and urgent. To this end, in order to ensure the design requirements, we use an end mill to replace the reamer boring bore, before machining, the end mill geometry angle sharpening correction, test after reaming