Laser assisted diamond turning is a potential approach to increase the surface finish quality on the hard and brittle materials and to improve diamond tool life. A high effective laser assisted turning (HE-LAT) method is proposed in this article, which guides the laser beam refracts at rake face, cutting edge, and total reflects at flank face. The HE-LAT method possesses effectively improved laser heating efficiency and can be employed to achieve the homogeneous optical surfaces on hard and brittle materials. The theoretical thermomechanical analysis and systematical experimental investigations are conducted to optimize the machining parameters of the proposed HE-LAT method. The nanoscale constitutive model of binderless WC has been obtained based on the high-temperature nanoindentation tests, which facilitates the workpiece thermal filed prediction cooperating with the relevant HE-LAT FEA model. The experimental results indicate that the HE-LAT method can help to eliminate the surface fluctuation effectively, thereby achieving better surface finish quality down to 0.92 nm in Sa on binderless WC. The diamond local graphitization can also be prevented owing to the lower essential laser power and suppressed chip adhesion problem. Furthermore, the workpiece residual stress can be greatly decreased owing to the smaller thermal-affected area of HE-LAT method.

激光辅助金刚石车削是提高硬脆材料表面光洁度和延长金刚石刀具寿命的一种潜在方法。本文提出了一种高效激光辅助车削（HE-LAT）方法，引导激光束在前刀面折射、切削刃和后刀面全反射。HE-LAT方法有效提高了激光加热效率，可用于在硬脆材料上实现均匀的光学表面。进行了理论热机械分析和系统实验研究，以优化所提出的 HE-LAT 方法的加工参数。基于高温纳米压痕试验，获得了无粘合剂WC的纳米级本构模型，这有助于与相关的 HE-LAT FEA 模型合作进行工件热场预测。实验结果表明，HE-LAT 方法可以有效地消除表面波动，从而在无粘合剂 WC 上实现更好的表面光洁度质量，在 Sa 中低至 0.92 nm。由于较低的基本激光功率和抑制的芯片粘附问题，也可以防止金刚石局部石墨化。此外，由于 HE-LAT 方法的热影响面积较小，工件残余应力可以大大降低。由于较低的基本激光功率和抑制的芯片粘附问题，也可以防止金刚石局部石墨化。此外，由于 HE-LAT 方法的热影响面积较小，工件残余应力可以大大降低。由于较低的基本激光功率和抑制的芯片粘附问题，也可以防止金刚石局部石墨化。此外，由于 HE-LAT 方法的热影响面积较小，工件残余应力可以大大降低。