节状切屑、积屑瘤和切削刃钝圆之所以能导致鳞刺，完全是由于在它们的前方都能形成层积金属。
It is because the accumulated metal can be lumped in front of a discontinuous chip, a bue and a rounded cutting edge of a tool hence the formation of scale on the occasions.
切削刃钝圆一般能使切屑卷曲半径增大。
The cutting edge roundness can make chip curling radii larger.
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