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Wyświetlanie 1-4 z 4
Tytuł:
Investigation of the Surface Topography of Titanium Alloys Applied to Friction Components
Autorzy:
Gawłowski, Grzegorz
Niemczewska-Wójcik, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2172357.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
orthopaedic implants
titanium alloy
surface metrology
surface topography
surface features
technological heredity
functional properties
Opis:
The subject of this study and analysis was titanium alloy, applied among others to the friction components of orthopaedic (artificial hip joint) implants. This material was subjected to abrasive finishing using a synthetic diamond as a tool. The properties of the studied titanium alloy were characterised. The processing technology and the research methods are discussed. The surfaces, after being subjected to abrasive machining, were studied using three research instruments – an interference microscope, a scanning electron microscope, and an atomic force microscope. Advanced metrology software was used to analyse the measurement data. The aim of the research was to present the changes taking place in the forming of the surface of the studied titanium alloy, in particular those occurring in the final sequential processing. A characterisation of the machined surfaces was prepared based on parametric (surface topography – parameters and functions) and non-parametric (surface morphology – images) analysis. The significant influence of the sequence and the tool (diamond grain and micro-grain) on the surface topography shaped during the technological process is presented. Improvement in the surface quality and features was observed. Parametric analysis showed no significant differences between TA-III and TA-IV surfaces, while these differences were visualised by non-parametric analysis. Moreover, the hereditary features of the surface topography (isotropy and pits/valleys) and their influence on the potential functional properties (place/area for accumulation/retaining of the lubricant in the friction zone) of the titanium alloy were analysed.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 2; 150--158
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
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
    Wyświetlanie 1-4 z 4

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