Optimizing CNC cutting tool geometrical parameters with carbide insert, which is made in Viet nam for best roughness and dimensional accuracy in both when contour turning SUS304 stainless steel ☆

This paper presents an experimental study to optimize cutting tool geometrical parameters (nose radius r, rake angle γ, relief angle α, elevation angle λ ...) with carbide insert, which is made in Viet nam, to ensure best surface roughness and dimensional accuracy in both when contour turning SUS304 stainless steel with convex curved profile on the CNC lathe. Method of Taguchi experimental design and analysis of variance (ANOVA) were used to assess the influence level of the geometric parameters of cutting tools on the two targets. The study results shows that the rake angle γ has the greatest influence level on the roughness, and the nose radius r, the relief angle α, the elevation angle λ in turn. For the dimensional accuracy (assessment by the deviation of the machining diameter compare with the design diameter ΔD), the rake angle γ have the the greatest influence level. Follow that, the contribution percentages for the nose radius r, the relief angle α, the elevation angle λ. By analysis and discussion on the experimental results, the study also finds out the optimized parameters set to achieve the best surface roughness and dimensional accuracy in both as follows: the rake angle γ (-5o), the relief angle α (12o), the nose radius r (0.4 mm),the elevation angle λ (-6o), the cutting edge angle φ (93o), the nose angle ε (35o).