QUALITY OF MACHINED SURFACES OF THIN-WALLED ELEMENTS OF PARTS UNDER THE ACTION OF REGENERATIVE VIBRATIONS DURING MILLING WITH END MILLS
DOI:
https://doi.org/10.20998/2078-7405.2026.104.14Keywords:
milling, end-mill, cutting surface, waviness, regenerative oscillation, forced vibrations, accompanying free oscillationAbstract
Monowheels, in which the disk and working blades constitute a single structure without detachable connections, are critically important components of new generation gas turbine engines for aviation and power engineering. The use of such structures allows to reduce the weight and increase the reliability of the units. However, errors in the shape of the functional surfaces of the blades that arise during mechanical processing lead to a decrease in the engine efficiency and an increase in fuel consumption. To ensure the accuracy of manufacturing the functional surfaces of the blades during the technological process, it is necessary to know the conditions under which cutting occurs. The work uses an approach based on the distribution of the entire range of cutting speeds into five speed oscillation zones. It was established that the third speed zone is the most unfavorable during milling of blades on multi-coordinate CNC machines. It is characterized by high-intensity vibrations, which worsens the quality of the machined surface and reduces the stability of the cutter. Their cause is regenerative oscillations, which are excited during machining by the trace left on the cutting surface by the accompanying free oscillation. The purpose of the study is to determine the influence of the axial depth of cut on the quality of the machined surface during milling in the third speed zone of vibrations. The results of the experiments showed that due to the peculiarities of up-milling with an axial depth of cut of ap = 1 mm, waviness on the machined surface is not formed, even in the presence of regenerative oscillations. The obtained data allow us to develop recommendations for the selection of cutting modes that minimize the amplitude of oscillations and ensure that the monowheel blades meet high operational requirements.
References
Erhan Budak An analytical design method for milling cutters with nonconstant pitch to increase stability – Part I: Theory; Part II: Application, Trans., ASME Journal of Manufacturing Science and Engineering, vol. 125, pp. 29–38, 2003. DOI:10.1016/j.ijmachtools.2005.09.009.
Zhou-Long Li, Oguzhan Tuysuz, Li-Min Zhu, Yusuf Altintas Surface form error prediction in five-axis flank milling of thin-walled parts, International Journal of Machine Tools and Manufacture. Vol. 128, pp. 21‒32, 2018. https://doi.org/10.1016/j.ijmachtools.2018.01.005.
Muhittin Caner Eksioglu, Z. Murat Kilic, Yusuf Altintas Discrete-time prediction of chatter stability, cutting forces, and surface location errors in flexible milling systems, J. Manuf. Sci. Eng. Vol. 134, 61006, 2012. https://doi.org/10.1115/1.4007622.
Oguzhan Tuysuz, Yusuf Altintas Frequency domain prediction of varying thin-walled workpiece dynamics in machining, J. Manuf. Sci. Eng. Vol. 139, 71013, 2017. https://doi.org/10.1115/1.4036124.
Oguzhan Tuysuz, Yusuf Altintas Time domain modeling of varying dynamic characteristics in thin-wall machining using perturbation and reduced order substructuring methods., J. Manuf. Sci. Eng. Vol. 140, 11015, 2018. https://doi.org/10.1115/1.4038000.
Jokin Munoa, Xavier Beudaert, Kaan Erkorkmaz, Alex Iglesias, Asier Barrios, Mikel Zatarain Active suppression of structural chatter vibrations using machine drives and accelerometers, CIRP Annals, vol. 64(1), pp. 385‒388, 2015. https://doi.org/10.1016/j.cirp.2015.04.106.
Iñigo Bediaga, Igor Egana, Jokin Munoa Time and Frequency Domain Models for Chatter Prediction in Milling, Chapter 04 in DAAAM International Scientific Book, pp. 033-048, 2005.
Jiawei Mei, Ming Luo, Jianglong Guo, Haonan Li, Dinghua Zhang Analytical modelling, design and performance evaluation of chatter-free milling cutter with alternating pitch variations, IEEE Access, vol. 6, pp. 32367 – 32375, 2018. https://doi.org/10.1109/access.2018.2841000.
Sergey Dyadya, Mykhaylo Frolov, Serhiy Tanchenko Vasyl Solokha Attendant Free Vibrations and Assessment of Their Influence on the Machined Surface Macrogeometry While End Milling, Lecture Notes in Mechanical Engineering, Р.327–337, 2025. DOI:10.1007/978-3-031-95211-1_27.
Vnukov Yuriy, Dyadya Serhiy., Kozlova Olena., Trishyn Pavlo ., Zubarev Andriy Influence of cutting time on types of oscillations during blade processing, Ukrainian Journal of Mechanical Engineering and Materials Science, Vol. 9, Number 1, pp. 53-66, 2023. https://doi.org/10.23939/ujmems2023.01.053.
Yusuf Altintas Manufacturing automation: metal cutting mechanics, machine tool vibrations, and CNC design.. 2nd ed. Cambridge University Press, 2012. 380 р. https://doi.org/10.1017/CBO9780511843723.
Dyadya Serhiy., Vnukov Yuriy., Kozlova Olena., Trishyn Pavlo Regularities of Oscillations During Turning and End Milling, Lecture Notes in Mechanical Engineering, pp. 136–144, 2024. https://doi.org/10.1007/978-3-031-42778-7_13.
Dyadya Sergei, Kozlova Olena, Tryshyn Pavlo, Brukhno Eduard, Yakhno Denys Influence of radial depth of cut on initial conditions of oscillations during end–milling of thin -walled parts, Cutting & Tools in Technological System, Vol. 99, pp. 153‒164, 2023. https://doi.org/10.20998/2078-7405.2023.99.14.
Vnukov Yuriy, Dyadya Sergei, Kozlova Olena et al. Self-oscillations during milling of thin-walled elements of parts: monograph. Zaporizhzhia: ZNTU, 2017. 208 p.
Mozgovoy Volodymyr, Dyadya Sergei, Kozlova Olena et al. Formation of the machined surface profile during cylindrical end milling under self-oscillation conditions, Engineering Bulletin, No. 1. pp. 92‒100, 2018.
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