concave milling cutter 凹半圆铣刀 ; 凹形铣刀
convex and concave milling cutter 凸凹铣刀
half-round concave milling cutter 凹半圆铣刀
one-fourth concave arc milling cutter 四分之一凹圆弧铣刀
However, after shaved by shaving cutter with true involute profiles, there are the "mid-concave" phenomena on the pitch points of shaved gear tooth profiles inevitably.
然而用标准渐开线齿形剃齿刀剃齿后，在工件齿形节点附近会出现不同程度的“中凹”现象。
Facts have proved that the designed shaving cutter is long-lived, good in machining quality, and effective on correcting centre-concave.
实践证明：设计出的剃齿刀寿命长，加工质量好，对中凹现象有明显改善。
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