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锯齿形切屑是金属切削过程中常见的切屑。在加工淬硬不锈钢的过程中,在较低的切削速度下就可以形成锯齿形切屑。锯齿形切屑的形成对机床稳定性、刀具寿命和已加工表面质量有着重要影响。文中用金属陶瓷刀具铣削马氏体不锈钢3Cr13Cu,研究切削速度和刀具磨损对锯齿形切屑形成的影响。结果表明,锯齿间距随切削速度和后刀面平均磨损宽度(VB)的增加而减少,即切屑上锯齿的形成频率随切削速度和后刀面平均磨损宽度的增加而增加。用M A Davies的绝热剪切理论解释后刀面磨损对锯齿形切屑的形成影响,表明用金属陶瓷刀具铣削马氏体不锈钢3Cr13Cu过程中绝热剪切参与了锯齿形切屑的形成。
Zigzag chips are common chips in metal cutting. Zig-zag chips can be formed at lower cutting speeds during the machining of hardened stainless steel. The formation of zigzag chips has an important effect on machine tool stability, tool life and machined surface quality. In this paper, the use of cermet cutter milling martensitic stainless steel 3Cr13Cu, cutting speed and tool wear on sawtooth chip formation. The results show that the sawtooth spacing decreases with the increase of cutting speed and average flank wear width (VB), that is, the sawtooth formation frequency increases with the increase of cutting speed and average flank wear width. The adiabatic shear theory of M Davis was used to explain the influence of flank wear on the formation of zigzag chips. It shows that the adiabatic shear involved in the milling of martensitic stainless steel 3Cr13Cu with cermet tools is involved in the formation of zigzag chips.