Optimal cutting parameter specification of newly designed milling tools based on the frequency monitoring

The article deals with the specification of the most suitable machining parameters for three newly designed end mills in the term of stability of the deep groove machining, at which the depth of cut is minimally twice higher the diameter of the cutter. Online vibration analysis was selected as a tool for goal achievement. The partial objective of the first phase of experimental research was to set the boundary conditions of vibrodiagnostics at the specification of the behaviour of three commercially produced milling cutters when the results were compared with the surface roughness achieved at the machining with individual cutting parameters. Vibrodiagnostic conditions were subsequently applied in the second phase of the experiment to determine the most suitable machining parameters of newly designed milling cutters. The Pinnacle VMC 650 CNC machining centre with Fanuc control system was used to perform the experiments. The material of cutters was S-grade sintered carbide, and all the designed cutters were PVD coated with the same AlTiN (aluminium titanium nitride) coating. The machined material was 16MnCr5 (1.7131) steel. The surface roughness analysis after machining by newly designed cutters pointed out that they are better as for the surface quality in comparison with the commercially produced end mills. Finally, it was possible to state that the four-tooth cutter 01-FVT with helix angles (β₁ = 39° and β₂ = 41°) and tooth pitch (τ₁ = 83° and τ₂ = 97°) seems to be the best tool for milling deep-shaped grooves among all the tested milling cutters.