将钻头前端未切削的工件材料部分定义为叠合层，指出叠合层的刚度分布情况是决定各个层间分层形状的关键因素。
Uncut layers in front of drill is called remaining layer, and its distribution of stiffness is the key factor to determine the delamination shapes of the interplies.
文章介绍了涂层刀具与未涂层刀具在切削加工中的性能比较及试验分析。
In this paper, the cutting performance between the coated cutters and the non-coated cutters are compared, and the tests are analyzed.
介绍了涂层刀具与未涂层刀具在切削加工中的性能比较及试验研究。主要通过不重磨车刀的耐用度及丝锥的切削力（扭矩）等因素来展开试验分析。
Performance of the coated tool and non-coated tool in cutting process is analyzed through measuring durability of the indexable insert turning tool and cutting force (torsional moment) of tap.
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