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Wyświetlanie 1-4 z 4
Tytuł:
The Use of 3D Scanning Methods to Evaluate the Hybrid Layer Used in Forging Tools in Order to Improve their Durability
Autorzy:
Gronostajski, Z.
Hawryluk, M.
Kaszuba, M.
Widomski, P.
Ziemba, J.
Smolik, J.
Powiązania:
https://bibliotekanauki.pl/articles/355972.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
forging process
destructive phenomena
durability of tools
scanning
hybrid layers
Opis:
This study is focused on tools used in the industrial process of hot forging of a front wheel forging (gear wheel) manufactured for the automotive industry. Five different variants were applied for the tools: 3 die inserts were coated with three different hybrid layers (PN + PVD type), i.e. AlCrTiN, AlCrTiSiN and CrN, one insert was only nitrided, and one was pad welded, to improve tool durability. The tool wear was analysed and represented by the material degradation on the working surface, based on the 3D scanning and the material growth of the periodically collected forgings. Additionally, the scanned tools were divided into two areas, in which it was found, based on the analysis, that various degradation mechanisms are predominant. Microstructural tests and hardness measurements of the analyzed tools were also performed. Based on the results, it was found that, in the central part of the die insert, thermo-mechanical fatigue, abrasive wear and plastic deformation occurred, while in the area of the bridge insert, only abrasive wear could be observed. For these areas, the loss of material was determined separately. It was established that the use of the GN+CrN and GN+AlCrTiN hybrid layers on forging tools improves their durability, while the best results in the central area were observed on the tool with the GN+CrN layer, which is the most resistant to thermo-mechanical fatigue. In the second analyzed area, good wear resistance occurred on GN+CrN, GN+AlCrTiN and pad welded inserts, for which, together with the increase of the forging number, a proportional, slight growth of the loss of material occurred.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1549-1558
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solution Examples of Selected Issues Related to Die Forging
Przykłady rozwiązań wybranych zagadnień związanych z kuciem matrycowym
Autorzy:
Gronostajski, Z.
Hawryluk, M.
Jakubik, J.
Kaszuba, M.
Misiun, G.
Sadowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/351846.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
die forging
microstructre
kucie matrycowe
mikrostruktura
Opis:
The paper presents selected examples of solutions and specific user applications associated with the industrial forging processes. Various process specific issues encountered during many years of bilateral collaboration with the forging industry are addressed and analysis methods are presented. As demonstrated in numerous articles and publications, the parameters influencing the die forging process are subject to complicated and mutually related dependencies, which can affect and complicate the methods of analysis. For this reason, researchers, more and more frequently, involve the use of additional support tools such as CAD / CAM / CAE, numerical modelling based on FEM, tool surface scanning methods, physical modelling, advanced microstructural research and dedicated control-measurement systems to validate engaged solutions. The research conducted by the authors included mainly: an analysis of the preform preparation, the impact of the geometry on the forging quality and the heating methods of the material and the tools, analysis of the tribological conditions, as well as an optimization of selected processes in respect of the force parameters, strain and temperature distributions and finally, a weight minimization of the input material. The issues discussed by the authors in the article intend, on the basis of the experience of its creators, to review the issues of the current forging technology and to indicate its possible solutions and development directions.
W artykule przedstawiono wybrane przykłady rozwiązań i ich zastosowań w przemysłowych procesach kucia matrycowego. Opisano zagadnienia i problemy, z którymi autorzy zetknęli się w trakcie wieloletniej współpracy z przemysłem kuzienniczym oraz metody ich analizy. Jak wykazano w licznych artykułach i opracowaniach parametry wpływające na procesy kucia matrycowego podlegają złożonym i wzajemnie powiązanym relacjom, które w znacznym stopniu komplikują analizę procesów kucia. Jest to powodem coraz częstszego sięgania po szereg narzędzi informatycznych: CAD/CAM/CAE, symulacje numeryczne oparte o MES, skanowanie powierzchni matryc i stempli, a także zaawansowane badania mikrostrukturalne, modelowanie fizyczne, czy też zastosowanie specjalnych systemów pomiarowo-kontrolnych do praktycznej weryfikacji zastosowanych rozwiązań. Przeprowadzone w pracy badania obejmowały głównie: analizę przygotowania wstępniaków, wpływu ich geometrii na jakość odkuwki, sposobu nagrzewania materiału i narzędzi, analizę warunków tribologicznych, a także optymalizację wybranych procesów ze względu na parametry siłowe, rozkłady odkształceń i temperatur oraz zminimalizowanie masy materiału wsadowego. Zagadnienia opisane przez autorów w artykule mają na celu przybliżyć problematykę współczesnych procesów kucia matrycowego i metody ich rozwiązywania oraz wskazać możliwe kierunki rozwoju tej technologii.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2773-2782
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Mechanisms Analysis of Dies Used in the Process of Hot Forging a Valve Made of High Nickel Steel
Autorzy:
Hawryluk, M.
Gronostajski, Z.
Kaszuba, M.
Krawczyk, J.
Widomski, P.
Ziemba, J.
Zwierzchowski, M.
Janik, M.
Powiązania:
https://bibliotekanauki.pl/articles/351102.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tool wear
tools durability
destructive mechanisms
valve engine
high nickel steel
Opis:
The study presents a durability analysis of dies used in the first operation of producing a valve-type forging from high nickel steel assigned to be applied in motor truck engines. The analyzed process of producing exhaust valves is realized in the forward extrusion technology and next through forging in closed dies. It is difficult to master, mainly due to the increased adhesion of the charge material (high nickel steel) to the tool’s substrate. The mean durability of tools made of tool steel W360, subjected to thermal treatment and nitriding, equals about 1000 forgings. In order to perform a thorough analysis, complex investigations were carried out, which included: a macroscopic analysis combined with laser scanning, numerical modelling by FEM, microstructural tests on a scanning electron microscopy and light microscopy (metallographic), as well as hardness tests. The preliminary results showed the presence of traces of abrasive wear, fatigue cracks as well as traces of adhesive wear and plastic deformation on the surface of the dies. Also, the effect of the forging material being stuck to the tool surface was observed, caused by the excessive friction in the forging’s contact with the tool and the presence of intermetallic phases in the nickel-chromium steel. The obtained results demonstrated numerous tool cracks, excessive friction, especially in the area of sectional reduction, as well as sticking of the forging material, which, with insufficient control of the tribological conditions, may be the cause of premature wear of the dies.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1963-1974
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of the Cognitive Radio Network with Opportunistic Spectrum Access
Autorzy:
Chęciński, R.
Kaszuba-Chęcińska, A.
Kryk, M.
Łopatka, J.
Malon, K.
Skokowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/226072.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MANET
cognitive radio
dynamic spectrum access
USRP
RF switch matix
real time demonstrator
Opis:
Efficient access to the spectral resources becomes a challenge for future military wireless communication systems. It requires spectral situation awareness, knowledge of current regulations, local policies and hardware platform limitations. It can be achieved by cognitive radios, realizing cognitive cycle, consisting typically of continuous observation, orientation, reasoning and decision making. All these elements must be realized in parallel and shouldn't interfere with each other. Even more difficult issue is related with cooperation between different nodes, especially in wireless domain, in harsh propagation conditions. Unpredictable phenomena create hard conditions for all deterministic behavior models, and their reproduction is a key element for efficient operation of the network. Very popular computer simulations are always simplified, and real time implementation gives an opportunity to make the next step in system elaboration. This paper presents a real-time demonstrator of cognitive radio network. It can work both in wired mode, using radio channel emulator and in mobile mode, to verify influence of real conditions on proposed cognitive solutions and assess their effectiveness.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 1; 51-56
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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