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。

The toolholder is used for outer slotting and the tool bar for inner slotting and for slotting the keyway.

机床附有电磁自动抬刀的刀架和刀杆。刀架用天外插削，刀杆用于内插削和插键槽。