Optimal cutting parameter specification of newly designed milling tools based on the frequency monitoring
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ORIGINAL ARTICLE
Optimal cutting parameter specification of newly designed milling tools based on the frequency monitoring Peter Pavol Monka 1,2 & Katarina Monkova 1,2
&
Vidosav D. Majstorovic 3 & Željko Božić 4 & Andrej Andrej 1
Received: 25 August 2020 / Accepted: 24 September 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract 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 01FVT with helix angles (β1 = 39° and β2 = 41°) and tooth pitch (τ1 = 83° and τ2 = 97°) seems to be the best tool for milling deepshaped grooves among all the tested milling cutters. Keywords Mill cutter . Tool geometry . Deep groove . Vibrations monitoring . Cutting parameters
Nomenclature fn Feed per revolution (mm/rev) fz Feed per tooth (mm) vc Cutting speed (m/min) ap Depth of cut (mm) γ Rake angle (°) β Helix lead angle (°) τ Pitch angle of teeth (°) D Diameter of milling cutter (mm) Ra Arithmetical average deviation from a mean line (μm)
Rz PVD FEM RMS FFT CNC CF VQMHVD
* Katarina Monkova [email protected]
1
Faculty of Manufacturing Technologies with the Seat in Presov, Technical University in Kosice, Presov, Slovakia
HHW
Maximal height of profile irregularities (μm) Physical vapour deposition Finite element method Root mean square Fast Fourier transformation Computer numerical control Crest factor Type of a commercially produced milling cutter Type of a commercially produced milling cutter
2
Vidosav D. Majstorovic [email protected]
Faculty of Technology, Tomas Bata University in Zlin, Zlin, Czech Republic
3
Željko Božić [email protected]
Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia
4
Faculty of Mechanical Engineering and Naval Arc
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