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Komputerowe wspomaganie procesu dynamicznego nagniatania śrutem kulistym

Szyc M., Kukiełka l., Legutko S.

Mechanik

2014

R. 87, nr 11CD

236--253

W pracy przedstawiono wyniki badań dotyczących opracowania efektywnego modelu dyskretnego, niezbędnego do numerycznej analizy (Metodą Elementu Skończonego) zjawisk fizycznych w procesie dynamicznego kulowania śrutem kulistym. Zbadano wpływ liczby elementów skończonych i zagęszczenia lokalnego siatki dyskretyzacyjnej na stany odkształceń oraz strukturę geometryczną przedmiotu obrabianego. Opracowana aplikacja numeryczna w programie ANSYS/LS-Dyna, zweryfikowana doświadczalnie, umożliwia analizę stanów naprężeń, odkształceń, przemieszczeń w dowolnej chwili trwania procesu i po procesie.

The paper presents results of research on the development of an efficient discrete model necessary for numerical analysis (finite element method) of physical phenomena in the of dynamic burnishing process. The influence of the number and density of the finite element mesh discretization on local conditions for deformation and geometric structure of the surface has been investigated. Developed application in Ansys/LS-Dyna program, experimentally validated, allows for the analysis of states stress, strain, displacement at any time during the process and after the process. The results obtained make it possible to design a dynamic burnishing process and its optimization depending on criteria such as: quality, durability.

Numerical analysis of influence of surface geometrical structure prepared under burnishing rolling onto the state of strains and stress in product surface layer

Kułakowska A., Kukiełka l.

Computer Methods in Materials Science

2009

Vol. 9, No. 1

66-71

In technological processes, in which as finishing off processing steps out the burnishing rolling, the object?s quality depends both from conditions of realization of burnishing rolling process and from the state of the object. One of the factors, which influence on the objects quality after burnishing rolling is the roughness of the surface. Steering proprieties of surface layer shaped with burnishing rolling makes possible adaptation of the technological quality of article to diverse conditions of exploitation. It creates then possibility of wide utilization this method of processing in practice. From the qualitative analysis of changes of the outline of asperities after burnishing rolling with current and from the dependences quantitative on parameters of this outline, come the following steering possibilities: a) distance of asperity\'s depressions - by the selection of the feed in previous treatment; b) the height of asperity - by the selection of the previous treatments conditions, the outline of burnishing element and the depth of burnishing; c) the shape of asperity\'s depressions: - the curve of the bottom of depressions - by the selection of tool\'s curve ray of the circuit surface in previous treatment, - the bearings of point Ck,l, by the selection of the previous treatment\'s conditions, the element\'s outline and the depth of burnishing; d) the outline and profile of roughness of asperities bear part -by the selection of outline and roughness profile of the active surface of burnishing element. The possibility of steering of asperity?s outline passed higher was experimentally confirmed. Numerical analysis of state of strains and stress in surface layer of rough surface after burnishing rolling is presented in this work. It is supposed that surface after previous treatment possesses determined, periodical profile of roughness about triangular outline. The real surface?s profile shaped in technological processes shows deviations of asperity?s height. Therefore it is important to qualify the dependence between height?s deviation of asperity prepared for burnishing rolling and state of strains and stress in shaped burnished surface layer. For this purpose, an application enabling computer simulations was created in Ansys computer program. The variables in the calculation are: deviation of the height of triangular asperity after turning Delta h=0,01÷0,04 [mm], its space deviation Delta s=0,05÷0,2 [mm]. Exemplary calculations were presented for C45 steel and triangular asperities with the vertical angle of Teta=90 [degree]. One parametrical functions of regression were elaborated. Results are shown in table, graphs and figures.

W pracy przedstawiono opracowaną w systemie komputerowym Ansys aplikację wykorzystywaną do symulacji procesu nagniatania naporowego tocznego. Zmiennymi w obliczeniach są odchyłka wysokości trójkątnych nierówności powierzchni po toczeniu w zakresie O.OK0.04 mm oraz odchyłka odstępu w zakresie 0.05-^-0.2 mm. Przykładowe obliczenia przedstawiono dla stali 45 i trójkątnych nierówności o kącie wierzchołkowym 90°. Opracowano jednoparametryczne funkcje regresji odkształceń i naprężeń. Wyniki przedstawiono w postaci tabeli, wykresów i zdjęć.