n.开孔

The principles, characteristics, processing laws and efficiency of EDM trepanning cavity of the moulds were analyzed. 分析了电火花套型加工的工艺原理、特点及加工工艺规律和加工效率。

About this standard provision classify, trepanning and reinforce of hull structure. 本标准规定了船体强力构件上的区域分类，开孔及补强。

The work principle of a bore trepanning machine for rare-earth permanent magnetic material prestented. 阐述了用于稀土永磁材料套孔加工的自动稀土旋孔机的工作原理，介绍了机械系统结构设计及特点。

In view of cost, practicability and maneuverability, the special sintering diamond trepanning drill was developed for drilling ceramic composite components originally. 根据复合构件加工中的各种缺陷，分析了采用预压应力钻削对改善表面加工质量的重要性。

Methods The results of anterior decompression and fusion with ZDS trepan in 27 patients with cervial injury and disc herniation were analyzed. 方法分析27例颈椎外伤、颈椎间盘突出症患者使用ZDS旋转推进式环锯行颈椎前路减压融合术治疗的结果。