Modelling and Simulation of a New Variable Stiffness Holder for Milling of Flexible Details - Publikacja - MOST Wiedzy

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Modelling and Simulation of a New Variable Stiffness Holder for Milling of Flexible Details

Abstrakt

Modern industry expectations in terms of milling operations often demand the milling of the flexible details by using slender ball-end tools. This is a difficult task because of possible vibration occurrence. Due to existence of certain conditions (small depths of cutting, regeneration phenomena), cutting process may become unstable and self-excited chatter vibration may appear. Frequency of the chatter vibration is close to dominant natural frequency of the workpiece or the tool. One of the methods of chatter vibration avoidance is matching the spindle speed to the optimum phase shift between subsequent cutting edges passes (i.e. the Liao-Young condition). However, the set of optimum spindle speeds from the point of view of vibration reduction may be not optimum one from other points of view. For example milling efficiency or machine tool capabilities cannot be assured. This article presents the idea of a workpiece holder with adjustable stiffness and discusses a new variant of its realization. In the holder , milling process is performed at constant spindle speed and feed speed. In order to avoid vibration the holder stiffness is modified. Stiffness changes modify natural frequencies of the workpiece and thus it is possible to modify dynamic properties of the workpiece in such a way that arbitrary chosen, constant spindle speed will be optimum, due to the Liao-Young condition performance. Calculation of the optimum stiffness is performed before milling, based on the workpieces modal identification results and the finite element model simulations.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
Polish Maritime Research nr 24, wydanie S1(93), strony 115 - 124,
ISSN: 1233-2585
Język:
angielski
Rok wydania:
2017
Opis bibliograficzny:
Kaliński K. J., Galewski M., Mazur M., Chodnicki M.: Modelling and Simulation of a New Variable Stiffness Holder for Milling of Flexible Details// Polish Maritime Research. -Vol. 24, iss. S1(93) (2017), s.115-124
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1515/pomr-2017-0029
Weryfikacja:
Politechnika Gdańska

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