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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effects of forming tools and process parameters on surface roughness in incremental sheet forming
    Autorzy:
    Khalil, Umair
    Aziz, Muhammad Haris
    Jahanzaib, Mirza
    Ahmad, Wasim
    Hussain, Salman
    Hafeez, Faisal
    Powiązania:
    https://bibliotekanauki.pl/articles/103319.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ISF
    quantitative survey
    forming tool
    forming parameters
    surface roughness
    badanie ilościowe
    narzędzia do formowania
    chropowatość powierzchni
    Opis:
    Literature has vastly advocated for incremental sheet forming as a significant process for formation of sheet metal components, because of its higher formability in comparison with the rest of metal forming processes such as deep drawing and stamping. Due to high formability of incremental sheet forming it becomes important to investigate the main factors, influencing the quality of forming products. However, less attention has been given to investigate the inconsistencies reflected often in determining the effect of multiple forming parameters and parametric interactions comprising of spindle rotational speed and feed rate, tool size and sheet thickness, sheet thickness and step depth. This study investigates the effect of various principal factors including tool type, tool size, sheet thickness, spindle speed, feed rate, step increment including and their respective interaction on surface roughness. Research data was collected by undertaking extensive literature review of previous studies on incremental sheet forming regarding surface quality. A quantitative one way analysis of variance (ANOVA) was employed to analyze the significance and contribution of factors influencing surface quality of sheet forming. The findings highlight the contribution of forming parameters and their combined interactions on surface roughness. Based on the empirical findings, this study derives implications for the optimization of tool type, parametric interactions among principal factors and their respective optimized operational range for incremental sheet forming.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 3; 75-95
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction modeling of Al-Mg alloy sheets based on multiple regression analysis and neural networks
    Autorzy:
    Lemu, H. G.
    Trzepieciński, T.
    Kubit, A.
    Fejkiel, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/102791.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    friction coefficient
    friction
    GRNN
    neural networks
    RBF network
    sheet metal forming
    Opis:
    This article reports a proposed approach to a frictional resistance description in sheet metal forming processes that enables determination of the friction coefficient value under a wide range of friction conditions without performing time-consuming experiments. The motivation for this proposal is the fact that there exists a considerable amount of factors affect the friction coefficient value and as a result building analytical friction model for specified process conditions is practically impossible. In this proposed approach, a mathematical model of friction behaviour is created using multiple regression analysis and artificial neural networks. The regression analysis was performed using a subroutine in MATLAB programming code and STATISTICA Neural Networks was utilized to build an artificial neural networks model. The effect of different training strategies on the quality of neural networks was studied. As input variables for regression model and training of radial basis function networks, generalized regression neural networks and multilayer networks the results of strip drawing friction test were utilized. Four kinds of Al-Mg alloy sheets were used as a test material.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 1; 48-57
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of forming titanium thin-wall panels with stiffeners
    Autorzy:
    Adamus, Janina
    Winowiecka, Julita
    Dyner, Marcin
    Lacki, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/102516.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    sheet
    commercially pure titanium
    sheet-metal forming
    stiffeners
    numerical simulation
    arkusz
    komercyjnie czysty tytan
    formowanie blachy
    usztywniacze
    symulacja numeryczna
    Opis:
    Due to the increase in the application of titanium components made of thin titanium sheets, in the work titanium panels made of 4 mm thick sheets are analysed. To increase the rigidity of the panels, some cross-shaped stiffeners were made. Such panels enable a reduction in weight while maintaining the existing strength of the drawn parts. Three kinds of commercially pure titanium are considered: Grade 1, 2 and 3. Numerical calculations were performed with PamStamp 2G based on the finite element method. The basic mechanical and technological properties of the analysed sheets, which are necessary for numerical modelling, were determined by static tensile testing. The friction coefficient was assumed based on the literature. On the basis of the performed numerical analyses, it was stated that the proper forming of panels with stiffeners depends not only on the drawability of the sheets but also on the technological parameters such as blank holder force and frictional conditions.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 54-62
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A pressure-bubble vacuum forming process for polystyrene sheet
    Autorzy:
    Sasimowski, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/103029.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    thermoforming
    vacuum assisted drape forming
    polystyrene sheet
    pressure-bubble vacuum forming
    Opis:
    The paper reports the results of a study on the effect of selected conditions of a pressure-bubble vacuum forming for polystyrene sheet on the non-uniformity of wall thickness of finished parts. The investigation was performed using DOE methods. Variables for the tests included temperatures in the external and internal zones of the heaters as well as heating time. The results demonstrate that the heating time and temperature in the internal zone formed by the heater have a statistically significant effect on the finished part’s wall thickness at the measuring points. It has been found that the side walls and bottom of the finished part are uniformly deformed, and thus exhibit the lowest wall thickness non-uniformity at a heating time of 22s (corresponding to the middle of the measuring range). Also, it is observed that the application of low temperatures in both zones of the heater has a positive effect. Due to the use of bubble, the finished parts exhibit a much lower wall thickness non-uniformity compared to those produced without bubble.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 2; 180-186
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of X-ray Diffraction for Residual Stress Analysis in Truncated Cones Made by Incremental Forming
    Autorzy:
    Krasowski, Bogdan
    Kubit, Andrzej
    Trzepieciński, Tomasz
    Dudek, Kazimiera
    Slota, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/102850.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    drawpiece
    incremental forming
    ISF
    steel sheet
    wytłoczka
    formowanie przyrostowe
    blacha stalowa
    Opis:
    The final accuracy of the parts formed using single point incremental forming greatly depends on the mechanical properties of the material to be formed and the residual stress formation. In this paper, an X-ray diffraction technique was used to study the distribution of the residual stress along the generating line of the conical drawpiece. A DC04 steel sheet with a thickness of 0.8 mm was used as a test material. The basic mechanical properties of the DC04 sheet metal were determined in the uniaxial tensile test according to the EN ISO 6892–1:2016. It was found that the maximum amount of the residual stress existed in a point located in the midway between a base and a truncation of the drawpiece. In the outer surface of the drawpiece, the orange peel defect associated with a rough surface appearance after SPIF a drawpiece, was observed. In contrast, the inner surface of component was characterized by linear grooves associated with the interaction of tool tip with the sheet surface. This defect is mainly influenced by vertical step size.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 2; 103-111
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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