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Wyznaczanie geometrii ziarna ściernego w modelu numerycznym na podstawie jego obrazów

Forysiewicz M., Bartosik P., Kukiełka L.

Pomiary Automatyka Kontrola

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2012

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R. 58, nr 5

464-467

PL

Celem pracy jest przedstawienie metod generowania kształtu modelu numerycznego ziarna ściernego w oparciu o analizę obrazów ziarna rzeczywistego. Przedstawiono metodykę generowania kształtu ziarn ściernych, dla trzech różnych sposobów analizy obrazów ziarn rzeczywistych, z wykorzystaniem programu Matlab 7.0. Uzyskane geometrie zastosowano w symulacjach numerycznych procesu szlifowania pojedynczym ziarnem ściernym w programie Ansys.

EN

The aim of this work is to present the methods for abrasive grain numerical model geometry generation based on analysis of real grain pictures. There is presented the methodology of abrasive grain shape generation for three different image analysis methods. The flowchart of the abrasive grain model generation algorithm for method No. 2 is shown in Fig. 4. Fig. 5 presents the flowchart for method No. 3. The retrieved geometries (Fig. 7) were used in numerical simulations of the single abrasive grain machining process. A significant difference in the approach proposed by the authors is a possibility of reproduction efficiency of the real abrasive grain geometry. The proposed new method for abrasive grain geometry generation is based on analysis of real grain images and creation of its numerical representation. This ensures irregular geometries of abrasive grains. The possibility of implementation of irregular numerical grain models in the ANSYS program will allow modelling and numerical simulation of the machining process at higher accuracy of numerical results (a numerical model will have reduced simplifications in relation to the real machining process). It is expected that three dimensional modelling and numerical simulation results will affect the further progress of science associated with efficiency increase of modeling machining operations processes. The numerical results will be subjected to experimental verification and may provide a basis for further modelling studies in this field.

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The shape of abrasive grain generating methods in numerical analysis

Forysiewicz M., Kukiełka L.

Journal of Machine Engineering

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2012

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Vol. 12, No. 4

15--22

EN

The aim of this work is to present the methods of abrasive grain numerical model geometry generation based on analysis of real grain pictures. The methodology of abrasive grain shape generation, for three different images analysis methods, was presented. Obtained an irregular geometry of abrasive grains. The possibility of implementation of irregular numerical grain models into the ANSYS program, will allow to the modeling and numerical simulation of machining process at higher accuracy of numerical results (the numerical model will have reduced simplifications in relative to the real machining process). The numerical results will be subjected to experimental verification and may provide a basis for further modeling studies in this scope.

3

Nowoczesne metody symulacyjne wspomagające proces doboru narzędzi ściernych do obróbki części samochodowych

Choromańska M., Kukiełka K., Kurcek R., Forysiewicz M.

Autobusy : technika, eksploatacja, systemy transportowe

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2012

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R. 13, nr 5

129-136

PL

Artykuł dotyczy nowoczesnych systemów symulacyjnych wspomagających proces doboru narzędzi ściernych. Opisano aplikację SKRAWANIE POJEDYŃCZYM ZIARNEM ŚCIERNYM w systemie ANSYS/LS-DYNA, służącą do kompleksowej analizy stanów odkształceń i naprężeń w przedmiocie obrabianym. Przedstawiono wyniki analizy wrażliwości wpływu stopnia zagęszczenia siatki elementów skończonych na efekty skrawania. Zamieszczono przykładowe mapy odkształceń zastępczych i naprężeń zastępczych dla różnych wariantów zagęszczenia siatki elementów skończonych. Wyniki symulacji mogą być podstawą doboru narzędzi ściernych do obróbki części samochodowych.

EN

This article concern to modern simulation systems which can support the process of grinding tools selection. The application of SINGLE GRINDING GRAIN in ANSYS/LS-DYNA system, let for complex time analysis of the state of strain and stress in work-pieces. Exemplary results of sensitivity analysis where influence density on finite element grid of grinding effect is observed. Exemplary maps of strain equivalent and stress equivalent for various variant of the finite element grid density were shown. Results of simulation can be used to selection of the grinding tool for machining on car parts.

4

Simulation of the process of machining with single abrasive grain in the aspect of the quality of surface layer of engine parts

Forysiewicz M., Kukiełka L.

Autobusy : technika, eksploatacja, systemy transportowe

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2011

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R. 12, nr 5

149-154

EN

In this paper the grinding process with single abrasive grain was developed. The effect of grinding process on the quality of the surface layer of engine parts was shown. Grinding process was conducted in ANSYS/LS-DYNA using the finite element method. Intensity of deformation maps at any time during the process time were obtained. Selected results of numerical analysis for the process of single abrasive grain grinding were presented.

PL

Praca dotyczy symulacji procesu skrawania pojedynczym ziarnem ściernym. Przedstawiono wpływ procesu skrawania na jakość warstwy wierzchniej części silnika spalinowego. Proces skrawania przeprowadzono w programie Ansys/Ls-Dyna za pomocą metody elementów skończonych. Otrzymano mapy intensywności odkształceń w dowolnej chwili czasowej trwania procesu. Przedstawiono wybrane wyniki analizy numerycznej procesu skrawania pojedynczym ziarnem ściernym.

5

Influence of Friction Coefficient in Tool : Object Contact Zone on State of Surface Layer After Turning Process

Forysiewicz M., Kukiełka L.

Machine Dynamics Research

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2010

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Vol. 34, No. 2

21-27

EN

The work concerns on the analysis of the influence of selected parameters of rolling process on state of surface layer. The numerical application in APDL language, in ANSYS/LS-Dyna system, for analysis of physical phenomena (strains) which occur in surface layer of material was developed. Physical phenomena, on a typical incremental step, were described in an updated Lagrange'a description, which shows the lowest sensitivity on large deformations. Carried out simulations for machining of various materials, which are characterized by a different plastic strain, allows to determine the factors influence on the shape of chip and wear of a turning tool which determine quality (surface roughness of the product). During the rolling process the influence of friction coefficient on the state of surface layer of processing material was investigated. The examples of numerical simulations results for selected time steps were presented.