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    Wyświetlanie 1-10 z 10
    Tytuł:
    Synthesis of nano-structured duplex and ferritic stainless steel powders by dry milling and its comparison with wet milling
    Autorzy:
    Shashanka, R.
    Uzun, Orhan
    Chaira, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/356573.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder metallurgy
    dry milling
    wet milling
    planetary milling
    stainless steel
    sintering
    Opis:
    In the present paper, elemental Fe, Cr and Ni powders were used to fabricate nano-structured duplex and ferritic stainless steel powders by using high energy planetary ball milling. We have studied the effect of milling atmosphere like wet (toluene) and dry (argon) milling of elemental Fe-18Cr-13Ni (duplex) and Fe-17Cr-1Ni (ferritic) powders for 10 h in a dual drive planetary mill. Stearic acid of 1wt.% was added during milling to avoid agglomeration. The dry and wet milled duplex and ferritic stainless steel powders were characterized by XRD, SEM and particle size analysis techniques. We have found that both the milling atmospheres have great influence in controlling the final particle morphology, size and phase evolution during milling. It was reported that dry milling is more effective in reducing particle size than the wet milling. The Nelson-Riley method of extrapolation was used to calculate the precise lattice parameter and Williamson-Hall method was used to calculate the crystallite size and lattice strain of both the stainless steel milled in argon atmosphere. Dry milled duplex and ferritic stainless steel were then consolidated by conventional sintering method at 1100, 1200 and 1300°C temperatures under argon atmosphere for 1 hour.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 5-14
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of depth of cut on chip formation in az91hp magnesium alloy milling with tools of varying cutting edge geometry
    Autorzy:
    Gziut, O.
    Kuczmaszewski, J.
    Zagórski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/102170.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    high-speed dry milling
    magnesium alloys
    machinability
    magnesium chips
    end-mill geometry
    Opis:
    Safety of Mg milling processes can be expressed by means of the form and the number of fractions of chips formed during milling. This paper presents the state of the art of magnesium alloys milling technology in the aspect of chip fragmentation. Further-more, the impact of the depth of cut ap and the rake angle γ on the number of chip fractions was analysed in the study. These were conducted on AZ91HP magnesium cast alloy and milling was performed with carbide tools of varying rake angle values (γ = 5º and γ = 30º). It was observed that less intense chip fragmentation occurs with decreasing depth of cut ap. The number of chip fractions was lower at the tool rake angle of γ = 30º. The test results were formulated as technological recommendations according to the number of generated chip fractions.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 26; 49-56
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The study of cutting forces and their amplitudes during high-speed dry milling magnesium alloys
    Autorzy:
    Zagórski, I.
    Kuczmaszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/102160.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    high-speed dry milling
    magnesium alloys
    aviation elements
    machinability
    cutting forces
    Opis:
    This paper presents the state of knowledge on cutting forces values during milling of different magnesium alloy types. Additionally, the results of own research on cutting forces and their amplitudes after milling magnesium alloys used for manufacturing elements applied in the aerospace industry are included. The subject of the analysis was the influence of technological parameters and the tool type on cutting forces and their amplitudes. The analysis is important due to the correlation between cutting forces and temperature in the cutting area, and, consequently, the safety of machining and strain of the workpiece.
    Źródło:
    Advances in Science and Technology. Research Journal; 2013, 7, 20; 61-66
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial neural network modelling of vibration in the milling of AZ91D alloy
    Autorzy:
    Zagórski, I.
    Kulisz, M.
    Semeniuk, A.
    Malec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/102005.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    magnesium alloys
    high-speed dry milling
    vibration
    chatter in milling
    simulation
    artificial neural networks
    Opis:
    The paper reports the results of artificial neural network modelling of vibration in a milling process of magnesium alloy AZ91D by a TiAlN-coated carbide tool. Vibrations in machining processes are regarded as an additional, absolute machinability index. The modelling was performed using the so-called “black box” model. The best fit was determined for the input and output data obtained from the machining process. The simulations were performed by the Statistica software using two types of neural networks: RBF (Radial Basis Function) and MLP (Multi-Layered Perceptron).
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 3; 261-269
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of chip ignition and chip morphology after milling of magnesium alloys
    Autorzy:
    Zagórski, I.
    Kuczmaszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/102563.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    magnesium alloys
    chip morphology
    time to ignition
    chip ignition
    high-speed dry milling
    Opis:
    The paper analyses the impact of specified technological parameters of milling (vc , fz, ap ) on time to ignition. Stages leading to chip ignition were analysed. Metallographic images of magnesium chip were presented. No significant difference was observed in time to ignition in different chip fractions. Moreover, the surface of chips was free of products of ignition and signs of strong oxidation.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 32; 101-108
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Quality in Milling of AZ91D Magnesium Alloy
    Autorzy:
    Zagórski, Ireneusz
    Korpysa, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/102494.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    magnesium alloys
    surface roughness
    high-speed dry milling
    stopy magnezu
    chropowatość powierzchni
    szybkie frezowanie na sucho
    Opis:
    This paper is an attempt at determining the effect of technological parameters of milling on the surface roughness of the AZ91D magnesium alloy. The cutting tool used in tests was a TiAlN-coated carbide milling cutter. The milling tests were carried out at variable cutting speed, feed per tooth and depth of cut, and the results were compared. The analysis was based on the 2D roughness parameters measured on the end and lateral faces of specimens, as well as on the 3D roughness parameters measured on the end faces of specimens. The test results indicated that the increase in the feed per tooth results in the increase in the value of 2D and 3D surface roughness parameters. It was found that cutting speed and axial depth of cut have a negligible effect on the 2D roughness of the workpiece surface, whereas the increase in cutting speed results in the reduction of the 3D surface roughness parameters.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 2; 119-129
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of technological parameters and geometric features of a cutting edge on cutting forces during AZ91HP alloy milling
    Wpływ parametrów technologicznych i cech geometrycznych krawędzi skrawającej na siły skrawania w procesie frezowania stopu AZ91HP
    Autorzy:
    Gziut, O.
    Kuczmaszewski, J.
    Zagórski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/175632.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-speed dry milling
    magnesium alloys
    machinability
    cutting forces
    frezowanie na sucho
    stopy magnezu
    skrawalność
    siły skrawania
    Opis:
    This article presents the state of knowledge on cutting forces during the milling of light alloys. Research results presented in the paper concern cutting forces and their amplitudes depending on the technological parameters (vc, fz, ap) with the use of two carbide milling cutters having a different cutting edge geometry (γ=5º and γ=30º). Research and analysis of cutting forces appear to be a significant factor determining chip deformation, temperature and cutting area strain, among others. Lower values of cutting force components are observed in the case of γ=30º tool processing. For the purpose of this research casting magnesium alloy AZ91HP was selected.
    W pracy wykonano analizę ogólnego stanu wiedzy dotyczącą sił skrawania podczas frezowania stopów lekkich. Przedstawiono wyniki pomiarów sił skrawania w zależności od zmiany określonych parametrów technologicznych (vc, fz, ap) przy zastosowaniu dwóch frezów węglikowych o zmiennej geometrii ostrza (γ=5º i γ=30º). Ustalono, że wartości sił skrawania są czynnikiem determinującym m.in. odkształcanie się wióra, temperaturę oraz odkształcenia materiału warstwy wierzchniej w strefie skrawania. Mniejsze wartości składowych sił skrawania stwierdzono dla obróbki narzędziem o kącie γ=30º. Proces obróbki prowadzono dla stopu magnezu AZ91HP.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 2; 83-92
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of chip fragmentation in AZ91HP alloy milling with respect to reducing the risk of chip ignition
    Analiza fragmentacji wiórów podcza s frezowania stopu AZ91HP w aspekcie zmniejszenia ryzyka za płonu
    Autorzy:
    Gziut, O.
    Kuczmaszewski, J.
    Zagórski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365824.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    high-speed dry milling
    magnesium alloys
    safety
    reliability
    maintenance of machines
    frezowanie na sucho
    stopy magnezu
    bezpieczeństwo
    niezawodność
    eksploatacja maszyn
    Opis:
    Magnesium alloys are used as advanced structural materials for producing machine components for the aircraft or automotive industry. The machining of these components involves the risk of uncontrolled ignition during machining operations and production of fine-grained chip fractions causing the wear of kinematic pairs in technological machines. Given the operation of machine tools, the determination of a method for assessing risk based on determining a safe milling range and suitable operational parameters seems justified. The paper presents the results of investigations on chip fragmentation, chip mass and dimensions. Based on these parameters, we determine effective and safe regions with respect to operation of machine tools. The experiments are performed on magnesium alloy AZ91HP, one of the most widely used casting alloys.
    Stopy magnezu są wykorzystywane jako nowoczesne materiały konstrukcyjne na elementy maszyn wytwarzane m.in. na potrzeby przemysłu lotniczego czy motoryzacyjnego. Obróbka skrawaniem tych elementów wiąże się z ryzykiem niekontrolowanego zapłonu podczas wykonywania operacji obróbkowych oraz powstawaniem drobnoziarnistych frakcji wiórów powodujących przyspieszone zużycie węzłów kinematycznych maszyn technologicznych. Zaproponowanie oceny ryzyka związanego z wyborem zakresu, uznawanego za bezpieczny, parametrów technologicznych frezowania, wydaje się celowe ze względów eksploatacyjnych maszyn obróbkowych. W artykule przedstawiono wyniki badań fragmentacji wiórów, ich masy oraz wymiarów charakterystycznych wiórów. Istotnym wydaje się określenie (na podstawie wymienionych wskaźników) obszarów uznawanych ze efektywne a zarazem bezpieczne z punktu widzenia eksploatacji maszyn obróbkowych. Do badań wytypowano często stosowany stop magnezu, z grupy odlewniczych, AZ91HP.
    Źródło:
    Eksploatacja i Niezawodność; 2016, 18, 1; 73-79
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Process Parameters During End Milling and Prediction of Work Piece Temperature Rise
    Autorzy:
    Bhirud, N. L.
    Gawande, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140078.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dry milling
    end milling
    Al 6063
    Taguchi method
    variance analysis ANOVA
    regression analysis
    frezowanie na sucho
    frezowanie wykończeniowe
    metoda Taguchiego
    analiza wariancji (ANOVA)
    analiza regresji
    Opis:
    During the machining processes, heat gets generated as a result of plastic deformation of metal and friction along the tool–chip and tool–work piece interface. In materials having high thermal conductivity, like aluminium alloys, large amount of this heat is absorbed by the work piece. This results in the rise in the temperature of the work piece, which may lead to dimensional inaccuracies, surface damage and deformation. So, it is needed to control rise in the temperature of the work piece. This paper focuses on the measurement, analysis and prediction of work piece temperature rise during the dry end milling operation of Al 6063. The control factors used for experimentation were number of flutes, spindle speed, depth of cut and feed rate. The Taguchi method was employed for the planning of experimentation and L18 orthogonal array was selected. The temperature rise of the work piece was measured with the help of K-type thermocouple embedded in the work piece. Signal to noise (S/N) ratio analysis was carried out using the lower-the-better quality characteristics. Depth of cut was identified as the most significant factor affecting the work piece temperature rise, followed by spindle speed. Analysis of variance (ANOVA) was employed to find out the significant parameters affecting the work piece temperature rise. ANOVA results were found to be in line with the S/N ratio analysis. Regression analysis was used for developing empirical equation of temperature rise. The temperature rise of the work piece was calculated using the regression equation and was found to be in good agreement with the measured values. Finally, confirmation tests were carried out to verify the results obtained. From the confirmation test it was found that the Taguchi method is an effective method to determine optimised parameters for minimization of work piece temperature.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 3; 327-346
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Waviness at dry high-speed face milling of some hard steels
    Autorzy:
    Beşliu-Băncescu, Irina
    Slătineanu, Laurenţiu
    Coteaţă, Margareta
    Powiązania:
    https://bibliotekanauki.pl/articles/2052146.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    waviness
    dry high-speed face milling
    hard steels
    milling parameters
    hardness
    empirical mathematical models
    Opis:
    Waviness is a parameter used to complete information on the machined surface state. There is little scientific and technical information on the influence exerted by the cutting conditions and the workpiece material hardness on the values of some parameters that define the waviness of milled surface. No works have been identified to present such information for dry high-speed face milling applied to hard steel workpieces. A factorial experiment with four independent variables at three variation levels was planned to model the influence of milling speed, feed, cutting depth, and steel hardness on the total heights of the profile and surface waviness for dry high-speed face milling. Mathematical processing of experimental results was used to identify the power type function and empirical mathematical models. These models highlight the direction of variation and the intensity of influence exerted by the considered input factors on the values of two waviness parameters in the case of dry high-speed face milling of samples made of four hard steels. It has been observed that the increase in steel hardness increases the total heights of the profile and surface waviness. In the case of two types of steel, a good correlation was identified between the values of the total profile waviness height and the total surface waviness height, respectively, using the Pearson correlation coefficient.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 735-749
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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