Stability of Serrated Milling Cutters

Dombovari, Zoltan [Dombóvári, Zoltán (Műszaki mechanika), szerző] Műszaki Mechanikai Tanszék (BME / GPK); Yusuf, Altintas; Stepan, Gabor [Stépán, Gábor (mechanika), szerző] Műszaki Mechanikai Tanszék (BME / GPK)

Angol nyelvű Tudományos Konferenciaközlemény (Könyvrészlet)
    High performance machining of super-alloys such as Titanium and \nNickel alloys are difficult \ndue to their thermal resistance and high strength, and they are \nmost widely used in \naerospace and biomedical industry. The low thermal conductivity \nof such alloys prevents \nthe application of high cutting speeds to avoid premature tool \nfailures and excessive tool \nwear. The performance of machining can mainly be improved by \nincreasing the depth of \ncut at low speeds. However, high strength of the materials leads \nto large cutting force \ncoefficients, which decrease the chatter free stable depth of \ncuts. Serrated cutters are \nmost commonly used to improve the chatter free depths of cuts in \nroughing operations. \nHowever, except few time-domain numerical simulation models, \nanalytical treatment of \nchatter stability of serrated cutters is not studied. This paper \npresents the stability model \nof serrated cutters in analytical semi-discrete time-domain. The \ncutter is divided into discrete \naxial elements where the engagement and chip load conditions \nvary. The phase \nshift between the waves ground on each flute and varying pitch \nangle among the successive \nflutes are incorporated to the semi-discrete time domain model \nof the cutter. \nThe stability of the overall cutter is investigated by checking \nthe eigenvalues of the linearized \nsemi-discrete dynamic model of the system. Since the stability \nis dependent on \nthe serration waves on the flutes, the cutter pitch angle and \nthe amplitude of the chip \nalong the flute, the cutter geometry and cutting conditions are \noptimized to achieve \nmaximum material removal rate. Sample simulation examples are \nshown to demonstrate \nthe viability of the proposed stability solution and \noptimization model.
    Hivatkozás stílusok: IEEEACMAPAChicagoHarvardCSLMásolásNyomtatás
    2022-01-20 13:11