如图1a所示,金属经粗切削后,金属晶格发生较大变形。若仍按粗切削方向进行精切(正向精切),则如图1b所示,金属晶格变形会更大。而当进行精切时的切削方向与粗切削方向相反时(反向精切),则如图1c所示,粗切削时金属晶格变形的部分可被切除和得到部分纠正,从而可提高精切的加工表面质量。 As shown in Fig. 1a, the metal lattice undergoes large deformation after rough cutting. If you are still in the rough cutting direction of the fine cutting (forward precision cutting), as shown in Figure 1b, the metal lattice deformation will be greater. When the cutting direction is opposite to the rough cutting direction during fine cutting (reverse cutting), as shown in Fig. 1c, the part of the metal lattice deformed during rough cutting can be cut off and partially corrected, Cut the machined surface quality.