Although laser-assisted turning (LAT) has been studied for decades, little is known on the effect of bulk temperature rise and residual temperature in the workpiece. Here we report an investigation on a comparison of bulk temperature characteristics in LAT of Ti6Al4V alloy and laser heating of Al/SiC metal matrix composite (MMC) as the two materials have significant differences in thermal conductivities. The research shows that at a low cutting speed with a low laser power density, and a larger laser beam spot, commonly used in previous LAT processing of Ti6Al4V alloy and Al/SiC MMC processes, it may cause too much heat accumulation inside the bulk material, particularly for the material with higher thermal conductivity. A new processing strategy for LAT is proposed based on this study, which combines high cutting speed, high laser power density, and a smaller laser beam spot size to avoid heat accumulation in the workpiece bulk and energy wastage during LAT of materials with high thermal conductivities. Besides, it is found that the cutting tool temperature at 0.3 mm cutting depth is higher than that at 0.5 mm cutting depth during LAT of Ti6Al4V, which is opposite to that in conventional machining.

尽管对激光辅助车削（LAT）进行了数十年的研究，但对整体温度升高和工件中残余温度的影响知之甚少。在这里，我们对Ti6Al4V合金的LAT中的体温特性与Al / SiC金属基复合材料（MMC）的激光加热的比较进行了研究，因为这两种材料在导热性方面存在显着差异。研究表明，在先前的Ti6Al4V合金和Al / SiC MMC工艺的LAT处理中通常使用的低切割速度，低激光功率密度和较大的激光束斑，可能会导致散装材料内部积聚过多热量，特别是对于具有较高导热率的材料。在这项研究的基础上，提出了一种新的LAT处理策略，该策略结合了高切割速度，高激光功率密度，以及较小的激光束光斑尺寸，以避免在对具有高导热率的材料进行LAT时，工件中的热量积聚和能量浪费。此外，发现在Ti6Al4V的LAT期间，在0.3mm的切削深度处的切削工具温度高于在0.5mm的切削深度处的切削工具温度，这与常规加工中的温度相反。