，
;The tool design,working methods and process fundamentals of the trepanning processing were introduced.It proved that trepanning processing is a more cost-effective and accurate method.
从
孔刀具的设计、加工
法以及孔工艺的基本要求几个面
,孔是一种更经济、有效并且精确的深孔加工法。
；用环锯行手术The tool design,working methods and process fundamentals of the trepanning processing were introduced.It proved that trepanning processing is a more cost-effective and accurate method.
从孔刀具的设计、加工法以及孔工艺的基本要求几个面,孔是一种更经济、有效并且精确的深孔加工法。
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