中文摘要：

提出一个锯齿形切屑模型,并在该模型基础上建立了表示切屑分节变形程度的相关参数计算公式;以高强度钢AerMet100为例进行了切削实验,对收集到的切屑进行了变形参数计算,验证了模型的有效性;在对实验结果讨论的基础上建立了切屑形态随切削速度提高而变化的模型,定性地分析了切屑随切削速度的提高产生锯齿化的原因,结果表明切屑随切削速度的提高而逐渐锯齿化的根本原因在于切削材料的动态强度（屈服强度、拉伸强度）的提高和热软化效应、应变硬化效应影响的减弱。

英文摘要：

A model of chip formation for high-speed machining was proposed.A serial of parameters were built to assess the deformation of the chip segment.Turning experiments were carried out on a kind of high-strength steel,AerMet100,to validate the model.A further discussions were made on the experimental results on which a model of chip formation at different cutting speeds was developed.The mechanisms of chip deformation at the different cutting speeds were studied qualitatively.It was found that with the increase of cutting speed,the material dynamic yield strength,tensile strength would be strengthened and the influence of thermal softening effect,strain hardening effect would be weakened,which could decidedly lead to the onset of serrated chip.