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    Wyświetlanie 1-8 z 8
    Tytuł:
    Safety in Rough Milling of Magnesium Alloys Using Tools with Variable Cutting Edge Geometry
    Autorzy:
    Zagórski, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2201905.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    magnesium alloys
    rough milling
    time to ignition
    ignition temperature
    chip mass
    chip fractions
    fragmentation
    Opis:
    This paper presents the results of a study investigating the problem of safety in dry milling magnesium alloy AZ91D. Selected indicators of safe machining were analyzed, including time to ignition, ignition temperature, chip mass and morphology. Experiments were performed using carbide end mills with a variable edge helix angle. It was observed that magnesium alloys could be dry milled without the risk of chip ignition. The milling process conducted with the axial depth of cut ap set to 6 mm was found to be optimum (a great amount of leading fraction A was produced). Unfortunately, however, some machining conditions proved to be inductive to the formation of chip powder known as magnesium dust. For most cases, chips obtained using the tool with λs 50° had higher unit mass than those obtained with λs 20°. Metallographic images of chips confirmed the safe range of the machining parameters employed (no partial melting or burn marks were observed). Determined on a specially designed test stand outside of the machine tool, time to ignition can be an effective parameter for performing simplified chip ignition simulations.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 2; 181--191
    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:
    Vibration analysis during AZ31 magnesium alloy milling with the use of different toolholder types
    Autorzy:
    Korpysa, Jarosław
    Zagórski, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2172033.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    vibration
    stability
    magnesium alloy
    milling
    Opis:
    Machining vibrations are an important issue as they occur in all types of machining processes. Due to its negative impact on machining results, this phenomenon is undesirable, and so there have been continuous efforts to find solutions that will minimise it, and thus improve the stability and safety of the machining process. The paper attempts to determine the impact of toolholder type and cutting condition on the vibrations generated while milling an AZ31 magnesium alloy. The tests were performed using the three most common types of toolholders: ER, Shrink Fit and hydraulic. The vibration displacement and acceleration signals were analysed based on parameters such as Peak-to-Peak, Peak, and Root Mean Square. Composite Multiscale Entropy was also applied to check the stability of cutting processes and define the level of signal irregularity. To determine the frequencies of vibrations and to detect chatter vibrations Fast Fourier Transform was performed. This provides information on the stability and enables vibrations to be minimized by avoiding unfavourable cutting conditions.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 3; 489--501
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of technological parameters on the surface roughness of aluminium alloys after turning
    Autorzy:
    Zagórski, Ireneusz
    Warda, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/102807.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminium alloys
    turning
    surface roughness
    stopy aluminium
    obracanie
    chropowatość powierzchni
    Opis:
    The paper analyses the effect of technological parameters of turning (vc and f) on the 2D surface roughness parameters of aluminium alloys. Turning was carried out with SVJBL 2525 M11 shank tool, with VCGT 110302FN-25P insert, dedicated for machining light alloys. Three aluminium alloy types were examined in the study: 7075, 2024, 6082. The present study is focused on selected 2D surface texture parameters, and concludes that feed exerts considerable impact on the surface quality. Simultaneously, the findings of the study indicate that from the technological perspective the change of cutting speed vc does not impact the quality of the machined surface.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 2; 144-149
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chip Temperature Measurement in the Cutting Area During Rough Milling Magnesium Alloys with a Kordell Geometry End Mill
    Autorzy:
    Kuczmaszewski, Józef
    Zagórski, Ireneusz
    Zgórniak, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2172352.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    magnesium alloys
    milling
    temperature in cutting area
    chip temperature
    infrared camera
    Opis:
    The paper presents the results of measurements of chip temperature in the cutting zone during milling. The main aim of the research was to record and compare the maximum chip temperature in consecutive frames of thermal images. An additional goal may be the influence of changes in technological parameters on the temperature of the chips in the cutting zone. Two grades of magnesium alloys were used for the tests: AZ31 and AZ91HP. The research used a carbide milling cutter with an additional chip breaker, dedicated to effective roughing of light alloys. These tool geometries can assist in the high-performance machining of magnesium alloys by efficiently splitting the chip and consequently reducing friction in the machining zone. This can reduce the cutting area temperature. The results of the research work were showed as exemplary "time" charts, box-plot charts and a summary table, which additionally included an error analysis of the measurement method. On the basis of the tests and measurements performed, it can be concluded that despite the observed chip fragmentation, the obtained temperatures can be defined as the so-called safe milling areas. During the machining tests, the risk of chip ignition during machining was not observed, also the characteristic melting points, which clearly indicates the safety of the milling process of these alloys. It has been observed that with the increase of vc and fz, there was no increase in the maximum temperature of the chip in the cutting area. This situation only occurs when increasing ap.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 2; 109--119
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    2D Geometric Surface Structure ANN Modeling after Milling of the AZ91D Magnesium Alloy
    Autorzy:
    Kulisz, Monika
    Zagórski, Ireneusz
    Józwik, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2172344.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    magnesium alloys
    milling
    roughness
    artificial neural networks
    simulations
    Opis:
    The paper presents the results of modeling 2D surface roughness parameters in milling by means of an artificial neural network (ANN). The AZ91D magnesium alloy was used. A HSS milling cutter was employed in the research. The main aim of the study was to obtain the lowest possible surface roughness (good quality) using a commonly available HSS cutter. The results of the research work were presented in the form of bar charts, surface charts and graphs depicting the quality of artificial neural networks. The conducted research shows that it is possible to carry out the machining processes that enable obtaining an average surface quality (defined by roughness parameters Ra, Rz, RSm, Rsk). The Ra, Rz, RSm parameters increase along with the machining parameters (fz, ap), as expected. The Rsk parameter takes (in most cases) negative values, which may indicate a surface with more intense friction and indicative of flat-topped distribution. On the other hand, the results of modeling the selected parameters – Ra, Rz, RSm – with the use of artificial neural networks allow concluding that the obtained network models show satisfactory predictive ability (R = 0.99), and thus are an appropriate tool for the prediction of surface roughness parameters.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 2; 131--140
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    State of residual stresses after the process of milling selected aluminium alloys
    Autorzy:
    Kuczmaszewski, Józef
    Łogin, Waldemar
    Pieśko, Paweł
    Zagórski, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/102158.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminium alloys
    high speed machining
    residual stresses
    stopy aluminium
    obróbka z dużą prędkością
    naprężenia szczątkowe
    Opis:
    The purpose of this paper was to analyse the structure and the state of residual stresses in the samples made of rolled AW-2024 and AW-7075 aluminium alloy plates, prior to machine cutting and after the process of milling under various machining conditions. The state of stresses was evaluated on the basis of measurements by means of sin2vF X-ray diffractometry and layer removal method. Furthermore, top layer microstructures were compared in half-finished product, machined product, and core material samples.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 63-73
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast, non-destructive measurement of roof-bolt loads
    Autorzy:
    Skrzypkowski, Krzysztof
    Korzeniowski, Waldemar
    Zagórski, Krzysztof
    Dominik, Ireneusz
    Lalik, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/178690.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    expansion-shell bolt
    monitoring
    non-destructive method
    laboratory tests
    Opis:
    This paper discusses the pull-out laboratory tests and the monitoring of expansion-shell bolts with a length of 1.82 m. The bolts comprised the KE-3W expansion shell, a rod with a diameter of 0.0183 m and a profiled, circular plate with a diameter of 0.14 m, and a gauge of 0.006 m. The bolts were installed in a concrete block with a compressive strength of 75 MPa. The tests were conducted on a state-of-the-art test stand owned by the Department of Underground Mining of the AGH University of Science and Technology. The test stand can be used to test roof bolts on a geometric scale of 1:1 under static and rapidly varying loads. Also, the stand is suitable for testing rods measuring 5.5 m in length. The stand has a special feature of providing the ongoing monitoring of bolt load, displacement and deformation. The primary aim of the study was to compare the results recorded by two different measurement systems with the innovative Self-Excited Acoustic System (SAS) for measuring stress variations in roof bolts. In order to use the SAS, a special handle equipped with an accelerometer and exciter mounted to the nut or the upset end of the rod was designed at the Faculties of Mining and Geoengineering and Mechanical Engineering and Robotics of the AGH University of Science and Technology. The SAS can be used for non-destructive evaluation of performance of bolts around mining workings and in tunnels. Through laboratory calibration tests, roof bolt loads can be assessed using the in-situ non-destructive method.
    Źródło:
    Studia Geotechnica et Mechanica; 2019, 41, 2; 93-101
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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