闩;A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.
设计了一种锁紧装置和一反锪孔刀杆，介绍了其结构原理。
底扩孔钻)扩孔[锪孔，镗孔，镗阶梯孔]；沉孔，埋头孔A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.
设计了一种锁紧装置和一反锪孔刀杆，介绍了其结构原理。
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