我们在加工某一机体零件时,遇到在同一轴线上有三个尺寸不同的孔,且中间的孔小。在既没有双头镗床,又没有高精度的回转工作台的情况下,要使最后一个大孔的尺寸精度达到设计要求,是比较困难的。过去加工时,我们将镗刀杆穿过中间小孔,然后装上刀头,反向进刀。每完成一次走刀,都要松开顶丝敲打刀头,调整一次吃刀量,每调整一次吃刀量,就得测量一次尺寸,以免调整过头造成废品。操作十分麻烦。为了解决这个问题,经过反复研究,我们设计了两节镗刀杆(附 When machining a body part, we encountered three holes of different sizes on the same axis with small holes in the middle. In the absence of double head boring machine, there is no high-precision rotary table under the circumstances, to make the last big hole size accuracy to meet the design requirements, is more difficult. In the past processing, we will boring bar through the middle hole, and then install the blade, the reverse feed. Each completed a walk, you have to loosen the top wire beat knife, adjust the amount of time to eat a knife, each adjusted to eat a knife, you have to measure the size, so as not to cause excessive adjustment of waste. Operation is very troublesome. In order to solve this problem, after repeated research, we designed two boring bar (attached