本文对金属切削毛刺分类体系的现状进行了系统的概述和分析，指出其存在的主要问题。
The paper gave a systematic general outline and analysis of the study on the classification of metal cutting burr, and pointed out the existing problems in them.
并提出了被切削层金属沿刀具切削刃向工件两侧的自由表面产生塑性流动是形成两侧方向毛刺主要原因的新观点，得到了试验结果的证实。
A new viewpoint was advanced, in which the plastic flow of metal layer to be cut becomes the cutting burr, and it was confirmed by experimental results.
毛刺是金属切削加工中产生的常见现象。
The burr is one of the common phenomena occurring in metal cutting.
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