试验表明，当超声工具头与被加工工件的间隙在一定的范围内，能在超声研磨条件下加工出高质量的超光滑表面。
Only when the machining gap is in specific ranges, the smooth high quality surface can be obtained under ultrasonic polishing.
冲子研磨器是标准冲子头刀口（POINT）之工具。
The punch former is a tool which grinds the standard punching pin head blade (POINT).
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