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深入研究锯齿形切屑的形成过程及表征有利于工业生产中的切屑控制。用锯齿频率、锯齿化程度及绝热剪切带间距来对锯齿形切屑进行表征。鉴于Ti6Al4V在加工过程中易于形成锯齿形切屑,因此选择Ti6Al4V作为工件材料,通过高速切削Ti6Al4V实验,收集不同切削速度和每齿进给量下的锯齿形切屑;将获得的锯齿形切屑进行抛磨及腐蚀后,在VHX-600 ESO数码显微镜下观察切屑形貌,计算不同切削条件下锯齿频率、锯齿化程度及绝热剪切带间距。结果表明:随着切削速度的提高,锯齿频率及锯齿化程度增大,绝热剪切带间距减小;随着每齿进给量的增大,锯齿频率减小,锯齿化程度及绝热剪切带间距增大。锯齿化程度可以作为普通切削、高速切削及超高速切削的判据。
In-depth study of sawtooth chip formation process and characterization is conducive to industrial production of chip control. Zigzag chips were characterized by saw tooth frequency, sawing degree and adiabatic shear band spacing. Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V Ti6Al4V After etching, the chip morphology was observed under a VHX-600 ESO digital microscope, and the saw tooth frequency, sawing degree and adiabatic shear band spacing under different cutting conditions were calculated. The results show that with the increase of cutting speed, the sawtooth frequency and sawing degree increase, and the adiabatic shear band spacing decreases. With the increase of feed per tooth, sawtooth frequency decreases, sawing degree and adiabatic shear With the spacing increases. The degree of sawing can be used as a criterion for ordinary cutting, high-speed cutting and ultra-high-speed cutting.