Study on the Cutting Surface Formation Mechanism of TA2 and TC4

Abstract

High speed machining of titanium and titanium alloy is an important and fundamental research topic in the field of machining. In this paper, the cutting experiments of commercial pure titanium TA2 and titanium alloy TC4 were carried out at different speeds. We used roughness measuring instrument and scanning electron microscope (SEM) to observe and analyze the cutting surface and particularly analyzed its roughness and microstructure characteristics under different cutting speeds. The experimental results show that in the cutting process, when the cutting speed of TA2 is higher than 79.13m/min, the surface roughness is reduced, the influence depth of extrusion and dislocation becomes shallow, and good surface quality is obtained; when the cutting speed of TC4 is close to 79.13m/min, the surface roughness is reduced, the influence depth of extrusion and dislocation becomes shallow, and good surface quality is obtained. At the same cutting speed, the surface roughness of TC4 is less than TA2, and the influence depth is also less than TA2, so Titanium alloy TC4 is easier to get good surface quality.