图1所示的轴承座零件是我公司重点产品的关键件，其两端轴承孔的同轴度要求为0．015mm以内，并且还有一系列的公差要求。加工难度大。以往在镗床T68上加工按通常的方法有几种，其中一种方法是加工完右端内孔后，采用镗刀往回拉的形式加工另一端内孔；另一种方法是用调转工作台 The bearing parts shown in Figure 1 are the key parts of our company’s key products. The coaxiality of bearing holes at both ends is less than 0.015mm, and there are a series of tolerance requirements. Processing difficult. In the past in the boring machine T68 processing according to the usual method there are several, one of the methods is to finish the right end of the hole, the use of boring tool to pull back the other end of the hole processing; the other method is to use transfer table