通常精镗活塞销孔时,先将活塞置于胎具上 (见图1)然后用手移动定位棒定位,夹紧活塞后取出定位棒,这样定位费时,加工时刀杆是悬臂状态。本文提出利用刀杆定位、切削时支座支承刀杆的方法 (见图2),可提高刀杆的刚度,具体如下。刀杆的前端为定位部分,操作时将活塞放在有预定位的胎 Usually fine boring pin hole, the first piston placed on the tire (see Figure 1) and then move the positioning rod positioning, clamping the piston and then remove the positioning rod, this time-consuming positioning, processing is a cantilever arm state. This paper presents the use of knife positioning, cutting support bearing Arbor method (see Figure 2), can increase the rigidity of the arbor, as follows. The front end of the shank is the positioning part, the operation of the piston on the pre-positioning of the tire