Cutting AISI 1045 steel at very high speeds
Cutting AISI 1045 steel at very high speeds
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DOI：
10.1016/j.ijmachtools.2011.12.009
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发表时间：
2012-05
影响因子：
14
通讯作者：
G. Ye;S. Xue;W. Ma;M. Jiang;Z. Ling;X. Tong;L. Dai
中科院分区：
文献类型：
--
作者：
G. Ye;S. Xue;W. Ma;M. Jiang;Z. Ling;X. Tong;L. Dai
建立了一套基于轻气炮技术的高速切削实验装置，实现了30 ~ 200 m/s的高速切削。对AISI 1045钢进行了高速切削试验。对锯齿形切屑形成过程中的物理现象进行了研究，分析了切屑的形貌、显微组织、显微硬度以及加工后的表面完整性。结果表明，随着切削速度的提高，切屑形貌由连续向锯齿状转变的原因可能是热塑性剪切带的反复出现，而不是周期性的开裂。特别是，在非常高的切削速度下观察到严重的材料流动导致热的质量传递。进一步研究了热质传递对热塑性剪切不稳定性的影响，结果表明热质传递会阻碍锯齿形切屑的形成。最后，简要讨论了高速切削过程中切削速度和质量传递对温度分布的影响。
An experimental device, based on the light-gas gun technology, was set up to realize high speed cutting over a wide range of cutting speeds from 30m/s to 200m/s. High-speed cutting experiments were performed on AISI 1045 steels. The investigation of chip morphology, micro-structures, micro-hardness and the finished surface integrity were carried out, focusing on the physical phenomena accompanying the saw-tooth chip formation. The results reveal that, with increasing the cutting speed, the transition of chip morphology from continue to saw-tooth could be attributed to repeated thermoplastic shear-banding rather than periodic cracking. In particular, a severe material flow leading to mass transfer of heat was observed at very high cutting speed. The effect of mass transfer of heat on thermoplastic shear instability was further investigated, which implies that the mass transfer of heat would retard the formation of saw-tooth chip. Finally, the influence of cutting speed and mass transfer on the temperature distribution during high speed machining was briefly discussed.