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    Wyświetlanie 1-8 z 8
    Tytuł:
    Research of the Tool Velocity and Product Shape Aspects of the Hot Radial Rolling of C45 Steel Rings
    Autorzy:
    Surdacki, Piotr
    Gontarz, Andrzej
    Winiarski, Grzegorz
    Samołyk, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2023794.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    experimental research
    process parameters
    FEM model
    ring rolling process
    badania eksperymentalne
    parametry procesu
    model FEM
    proces walcowania pierścieni
    Opis:
    The control of product shape and dimensions poses some problems in hot ring rolling. In the rolling process, material flows both circumferentially and axially, which leads to increased ring height. Changes in shape and dimensions of ring cross section depend on several process parameters, which makes it difficult to predict ring diameter. This paper presents the results of a study investigating the hot radial rolling process for C45 steel rings in terms of the effect of main roll feed speed on product geometry. It was found that the application of a higher feed speed of the main roll and thus of a greater ratio between this speed and circumferential speed of the main roll led to increased axial material flow and reduced cross-sectional defect known as ”fishtail”. Machining losses generated due to cross-sectional defects were also determined. Results were used to determine the feed speed to circumferential speed ratio ensuring the lowest possible cross-sectional defect and material consumption.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 4; 352-363
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of three-stage the forming process hollow forgings with an outer flange
    Autorzy:
    Wójcik, Łukasz
    Bulzak, Tomasz
    Winiarski, Grzegorz
    Szala, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/135267.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    forging
    extrusion
    radial forging
    hollow part
    stepped shaft
    flanging
    Opis:
    This article presents the results of computer simulations used to investigate the forming of a hollow coldworked forging with an outer flange. Numerical simulations were performed in Deform 2D/3D using a calculation module for axial-symmetric cases. A ϕ57×12.5 mm tube-shaped billet from 42CrMo4 grade steel was used. The forming process involved two and three stages, consisting of extrusion the shaft portion and forging the flange. The objective of this research was to determine the accuracy of the forming process used to produce the hollow part. This technology was analyzed using the effective strain distributions, the Cockcroft-Latham fracture criterion values, and the forming force progression. The results showed that it was possible to use this three-stage process to forge elements from a tube-shaped billet.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 62 (134); 142-147
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of a Six Stage Forging Process for Producing Hollow Flanged Parts from Tubular Blanks
    Autorzy:
    Winiarski, Grzegorz
    Bulzak, Tomasz Adam
    Wójcik, Łukasz
    Szala, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/101985.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    flanging
    extrusion
    hollow parts
    stepped shaft
    kołnierzowanie
    wytłaczanie
    części drążone
    wał stopniowany
    Opis:
    This paper presents the results of a numerical analysis of a cold forging process for a hollow flanged part. The analysis was performed using Deform 2D/3D. 42CrMo4 steel tubes were used as the billet material, and their material model in the annealed state was described by a constitutive equation. The forming process was performed in six stages with the use of methods such as extrusion with a movable sleeve, open-die extrusion, and upsetting. The objective of the study was to determine whether the proposed forging technique could be used to produce hollow parts with flanges. The determination was made based on the analysis of product geometry quality and process parameters, including the Cockcroft-Latham ductile fracture criterion and forming forces.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 1; 201-208
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Tool Kinematics on Tube Flanging by Extrusion with a Moving Sleeve
    Autorzy:
    Winiarski, Grzegorz
    Bulzak, Tomasz Adam
    Wójcik, Łukasz
    Szala, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/103162.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    extrusion with a moving sleeve
    42CrMo4 steel
    hollow parts
    flange formation
    wytłaczanie z ruchomą tuleją
    stal 42CrMo4
    puste części
    formowanie kołnierza
    Opis:
    This paper presents the results of a numerical investigation into tube flanging by extrusion with a moving sleeve. Two cases of the extrusion process are investigated, each described with a different tool kinematics. Effects of flange diameter, gap height and tool motion on the extrusion process are examined. The numerical analysis is performed on 42CrMo4 steel tubes deformed at ambient temperature. Obtained numerical results are then used to determine metal flow patterns and examine force parameters in the extrusion process, as well as to determine a technological window for the investigated method.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 3; 210-216
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Method of Flanges Extrusion in Hollow Products – Analysis of the Limiting Phenomena
    Autorzy:
    Winiarski, Grzegorz
    Bulzak, Tomasz Adam
    Wójcik, Łukasz
    Szala, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/103394.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    extrusion
    flanging
    hollow parts
    cold metal forming
    odrzucenie
    kołnierz
    puste części
    formowanie metali na zimno
    Opis:
    The paper presents an innovative method of metal forming of hollow flanged elements. In this process, flanges are formed using a movable sleeve, which moves in the opposite direction to the punch. The movement of the sleeve causes a closed impression to open, due to which the flange is also formed in a semi-free impression. The tube billets were made of the 42CrMo4 grade steel deformed under the cold metal forming conditions. The calculations were conducted using the finite elements method in Deform-2D/3D. Various technological parameters of the process were analysed, among others the diameter of the flange and the initial height of the impression of the movable sleeve. On the basis of the obtained results, the limiting phenomena of the process were determined and the influence of the analysed technological parameters on these phenomena were presented.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 4; 78-85
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Creating the Structure and Properties of 7075 Alloy Casts by Thermal and Forming Processes
    Autorzy:
    Majerski, Krzysztof
    Dziubińska, Anna
    Winiarski, Grzegorz
    Szucki, Michał
    Drozdowski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/102229.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminum alloys
    heat treatment
    metal forming
    microstructure
    stopy aluminium
    obróbka cieplna
    obróbka metali
    mikrostruktura
    Opis:
    In this paper, the hot formability of 7075 aluminum alloy sand and permanent casting ingots were verified. The experiment was carried out by using casting, heat treatment (homogenization) of ingots and conducting isothermal compression tests at temperatures of 420-500°C. The effect of the forming temperature on the microstructure, the tendency for crack formation and hardness were determined. The results show that ingots in the as-cast state have a dendritic network structure rich in the second phase precipitation on the grain boundaries. After the homogenization process, the microstructure is significantly more balanced. The forming process at 420-480°C of sand casts leads to significant grain elongation and crack formation, mainly at the grain boundaries. Raising the forming temperature to 480-500°C leads to a reduction in the occurrence of cracks. On the other hand, permanent mold castings do not reveal cracks during deformation in the temperature range 420-480°C.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 4; 15-21
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of austenitic interlayer on the properties of stellite padding welds after impact-hardening
    Ocena wpływu międzywarstwy austenitycznej na właściwości napoin stellitowych utwardzonych udarowo
    Autorzy:
    Henzler, Weronika
    Sawa, Mateusz
    Trębicki, Przemysław
    Szala, Mirosław
    Winiarski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1819232.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    stellit
    napawanie TIG
    warstwa buforowa
    twardość
    umocnienie udarowe
    młot resorowy
    stellite
    TIG cladding
    interlayer
    hardness
    impact hardening
    spring hammer
    Opis:
    Stellites (Co-Cr-W-C) are the specific group of coating materials used for surface modification of the engineering materials and for remanufacturing. The aim of the paper was to research the influence of austenitic (308LSi) interlayer on hardening rate of stellite 1 and stellite 6 after impact hardening. The samples have been cladded by TIG welding method with interlayer and without. Before impact hardening the samples have been visually and penetrant non-destructive tested. The samples after impact hardening have been tested by metallographic and Vickers hardness methods. The highest impact hardening effect have been revealed for coatings deposited with interlayer. The highest impact hardening effect was achieved for the padding welds produced with the interlayer, i.e. for stellite 1 (increased by 29.8%) and stellite 6 (increased by 42.7%). The hardening of the coating samples deposited without interlayer was lower and amounted to stellite 1 (increased by 13.7%) and stellite 6 (increased by 29.8%) respectively. The highest hardness values were obtained for impact-hardened cladded welds without the use of an interlayer (stellite 1; 790 HV0.1 and stellite 6; 732 HV0.1). The use of an interlayer reduces the hardness of the stellite coating while increasing the susceptibility to hardening and plastic deformation of the produced coating.
    Stellity (Co-Cr-W-C) stanowią grupę materiałów stosowanych do napawania produkcyjnego i regeneracyjnego. Celem pracy było zbadanie wpływu międzywarstwy austenitycznej (308LSi) na stopień umocnienia się napoin stellitowych (stellit 1 i stellit 6), poddanych działaniu obciążeń udarowych. Próbki napawano metodą TIG z zastosowaniem międzywarstwy oraz bez udziału międzywarstwy. Po przeprowadzeniu badań wizualnych i penetracyjnych próbki zostały poddane utwardzeniu udarowemu. Wykonano badania metalograficzne oraz badania mikrotwardości sposobem Vickersa. Największe utwardzenie udarowe uzyskano dla napoin wytworzonych z międzywarstwą, tj. dla stellitu 1: 29.8% i stellitu 6: 42.7%. Utwardzenie próbek napawanych bez międzywarstwy było niższe i wynosiło kolejno dla stellitu 1: 13.7% i stellitu 6: 29.8%. Najwyższe wartości twardości uzyskano dla napoin utwardzanych udarowo bez zastosowania międzywarstwy (stellit 1; 790 HV0,1 i stellit 6; 732 HV0,1). Zastosowanie międzywarstwy obniża mikrotwardość powłoki stellitowej jednocześnie zwiększając podatność do umocnienia i odkształcenia plastycznego wytworzonej powłoki.
    Źródło:
    Welding Technology Review; 2021, 93, 2; 13--20
    0033-2364
    2449-7959
    Pojawia się w:
    Welding Technology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the deformability of aluminium-copper casting alloys
    Autorzy:
    Winiarski, Grzegorz
    Dziubińska, Anna
    Majerski, Krzysztof
    Szucki, Michał
    Drozdowski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/957905.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminium alloy
    metal forming
    upsetting test
    qualitative research
    stop aluminium
    formowanie metali
    test spęczania
    badania jakościowe
    Opis:
    The paper presents the results of a numerical analysis and experimental tests investigating the deformability of castings made of two aluminium alloys: EN AW-2017A and EN AW-2024. Test specimens were produced by two casting methods: sand casting and permanent mould casting. The castings were first subjected to homogenizing annealing; afterwards, they were shaped into cylindrical specimens for an upsetting test. This test was conducted on a hydraulic press in the temperature range of 420500˚C. Visual inspection of the specimens and examination of their microstructure were performed. Hardness of selected specimens was also measured. The study led to determination of the effect of the mould type on the deformability of the castings and the hardness of forgings obtained from these casting. Obtained results also became a basis for determining the forging temperature ranges for casting preforms made of the investigated aluminium alloys.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 3; 242-249
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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