Abstract
In our previous researches, the coated-cemented-carbide tool is found so effective for the ultra-precision cutting of stainless steels and titanium metals and so on. In case of ultra-precison cutting of conventional steels and hardened die steels, carbideparticles included inside materials is inferred to influence the finished surface roughness and the tool life. In order to improvethe surface roughness and the tool life, in the research, the effect of low cutting speed on ultra-precision cutting of pure iron withcoated-cemented-carbide tool is examined. Using the low cutting speed below 1 m/min and depth of cut of 5 μm, the surfaceroughness improves remarkably and attains below 34 nm(Rz) at cutting length of L = 40 m and keeps below 100 nm(Rz) untilcutting length of 800 m. Tool wears after ultra-precision cutting of pure iron in cutting length of L = 40 m and 1,000m becomeVB = 15 μm and 30 μm, respectively, by using the low cutting speed of below 1 m/min.
