锪，拼音为huo，用埋头钻（锪钻）在一钻孔上钻出漏斗形的凹坑 [countersink]。如：锪孔
介绍了一种数控反锪刀具的设计及其工作原理。
This article introduces the design and work principle of NC back spot facer.
介绍了一套能适应不同孔径的正反向锪平的工艺装备。
A set of technological equipment of front_to_back spot facing which is suited for different aperture is introduced.
可以进行钻孔、扩孔、铰孔、镗孔、攻丝、锪平面，倒角等工作。
This machine can be used drilling, core drilling, reaming, boring, tapping, spot-facing and chamfering etc.
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