Abstract
In high-speed milling, the machining system is affected by a chatter resulting from the dynamic interaction between the tool and the part, which can cause harmful effects on the tool and the machined surface of the part. Chatter occurs more frequently for the milling of thin-walled parts due to their low stiffness. In addition, the dynamic characteristics of thin-walled parts vary along the tool path. The dynamics of the part are therefore the dominant factor that should be considered in the modeling and the study of the milling process and must be performed in 3D, where the third dimension is the tool position. This paper studies the milling stability of Al 7075-T6 thin-walled parts during high-speed milling considering the variation of dynamic characteristics and develops three-dimensional stability lobe diagrams of the spindle speed, axial depth of cut, and tool position. The dynamic equations of motion are solved numerically using semi-discretization method. Modal parameters of the tool and the part were extracted experimentally by modal tests. Then, cutting tests were conducted to validate the established model by measuring the machined surface roughness which is used as a criterion for detecting instability. The experimentally obtained results correspond well with the predicted stability limits. Moreover, the influence of different cutting parameters on the machining stability along the tool path was investigated. It is found that the variable spindle speed improves significantly the cutting process, and the best selection of feed per tooth impacts positively on the machined surface quality.
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Abbreviations
- m x , m y ,m v :
-
Modal mass in x, y and v direction
- k x , k y ,k v :
-
Modal stiffness in x, y and v direction
- c x , c y ,c v :
-
Modal damping in x, y and v direction
- ξ :
-
Damping ratio
- f n :
-
Natural frequency
- F x , F y ,F v :
-
C utting force in x, y and v direction
- a p :
-
Axial depth of cut
- a e :
-
Radial depth of cut
- h(t) :
-
Chip thickness
- K t :
-
Tangential cutting force coefficient
- K r :
-
Radial cutting force coefficient
- θ j (t) :
-
Angular immersion of the tooth j
- r(t) :
-
Relative vibration displacement in radial direction
- τ :
-
Delay period
- n :
-
Number of discretizations over a period τ
- Ω :
-
Spindle speed
- f t :
-
Feed per tooth
- N :
-
Number of teeth
- D :
-
Diameter of cutter
- λ :
-
Helix angle of cutter
- P(t) :
-
Present state matrix
- D(t) :
-
Delayed state matrix
- Φ :
-
Transition matrix
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All authors contributed to the conceptual design, methodology, formal analysis and validation. The first draft of the manuscript was written by DAMOUS Mohamed, and all authors revised and commented on all versions of the manuscript. All named authors have read and approved the final manuscript.
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Damous, M., Zeroudi, N., Chellil, A. et al. Prediction of a chatter stability of thin-walled parts during high-speed milling considering a variation of dynamic characteristics based on surface roughness measurement. Int J Adv Manuf Technol 127, 5729–5744 (2023). https://doi.org/10.1007/s00170-023-11945-6
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DOI: https://doi.org/10.1007/s00170-023-11945-6