This study investigates flank face friction while micro machining commercially pure titanium (cp-Ti grade 2) work material considering size effects. It is important to understand friction phenomena at the tool flank and work material surface since they affect the surface integrity of the machined parts. A single crystal diamond grooving tool is used in machining experiments to reduce the influence of cutting edge radius. In addition, plunging type of cutting experiments were performed to investigate the influence of flank face contact on the machined surface. A friction model which is based on work and tool material properties is proposed to model the contribution of adhesion and deformation of the flank face coefficient of friction. The results show that for the cp-Ti and diamond tool pair, adhesion seems to be the dominant model of friction and also contributes to the size effect. The deformation friction becomes more dominant during the chip formation stage. When cutting edge effect is eliminated, the influences of flank and rake face friction on the size effect are shown.

本研究调查了考虑尺寸效应的商用纯钛（cp-Ti 等级 2）工件材料微加工时的后刀面摩擦。了解刀具侧面和工件表面的摩擦现象很重要，因为它们会影响加工零件的表面完整性。在加工实验中使用单晶金刚石开槽刀具，以减少切削刃半径的影响。此外，还进行了切入式切削实验，以研究后刀面接触对加工表面的影响。提出了一种基于功和刀具材料特性的摩擦模型，以模拟后刀面摩擦系数的粘附和变形的贡献。结果表明，对于 cp-Ti 和金刚石工具对，粘附似乎是摩擦的主要模型，也有助于尺寸效应。在切屑形成阶段，变形摩擦变得更加重要。消除切削刃效应后，后刀面和前刀面摩擦对尺寸效应的影响如图所示。