Wyniki wyszukiwania - Biblioteka Nauki

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Quality-cost analysis of modern carburising technology implementation in the production cycle of cog elements for the aviation industry

100%

Pawęta S. , Pietrasik R.

Archives of Materials Science and Engineering

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2017

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tom Vol. 87, nr 2

75--84

EN

Purpose: The aim of the study was to analyse the possibility of introducing vacuum carburising technology with pre-nitriding in the aviation industry. Design/methodology/approach: The samples have been tested with new technology and the planet gear requirements for aviation applications were determined. The effect of pre-nitriding technology used before vacuum carburising was also investigated for antidiffusional surface protection. A cost analysis of replacing the conventional technology with a new low-pressure carburising technology has also been introduced. Findings: Structural characteristics of the obtained layers were determined in terms of carbon concentration distribution, effective and total thicknesses, hardness of the surface and core, structure, grain size, residual austenite content and lack of decarburization and internal oxidation. The degree of degradation of various forms of anti-diffusion protections in the form of pastes and coppering and their effect on the surface layer have also been investigated. The comparative economic analysis of the use of conventional and vacuum technologies, namely the carburization in a function of the required thickness of the hardened layer and temperatures of processes, has also been made. Research limitations/implications: Basing on the studies and analyses carried out in this work, it can be concluded that the introduction of pre-nitriding carburising technology instead of conventional carburising technology in endothermic atmosphere is justified qualitatively and economically alike. Practical implications: The analysis of the test results confirms that it is possible to meet the requirements of the aviation industry through high temperature pre-nitriding vacuum carburising. The results of anti-diffusion protection tests confirm that it is possible to use anti-fouling pastes instead of electrolytic copper. Cost analysis confirms the economic benefits of implementing a new technology. The implication of the above is the willingness of the proposed technology to allow testing in the aviation industry. Originality/value: The research confirming the fulfilment of quality requirements set for hardened layers in aviation applications which also have an economic advantage.

2

Low-pressure ferritic nitrocarburizing: a review

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Taczała-Warga J. , Pawęta S.

Archives of Materials Science and Engineering

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2023

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tom Vol. 119, nr 2

62--70

EN

Purpose: The purpose of this article was to present in a concise and organized way the available knowledge about ferritic nitrocarburizing in low-pressure. The authors aimed to indicate the research gap, and the whole article is a starting point for further research. Design/methodology/approach: The research method was the analysis of available literature, patent database and industry notes from manufacturers of modern furnaces. Findings: The ferritic nitrocarburizing process has many advantages in line with the market demand and the lack of solutions. The article summarizes the knowledge in the field of the ferritic nitrocarburizing process as a systematization of knowledge and a starting point for further research. Research limitations/implications: The information described in the article requires further laboratory research. Practical implications: The information collected by the authors was the basis for developing the technology discussed in the LIDER/3/0025/L-12/20/NCBR/2021 project. Originality/value: Research on this type of treatment will enable the development of technology and will meet the expectations and needs of the industry. It will also provide benefits in the form of a better understanding of the processes and the determination of the relationship between the parameters and the properties of the obtained surface layers.

3

The influence of hardening medium in the vacuum carburizing process on the distortion of machine elements used in the automotive industry

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Pawęta S. , Pietrasik R.

Journal of Achievements in Materials and Manufacturing Engineering

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2019

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tom Vol. 94, nr 1-2

32--40

EN

Purpose: As part of this study, the influence of the hardening medium on distortions of FineCarb® carburized rollers used in the automotive industry as elements of fuel pumps has been examined. The analysis was carried out for the process of quenching in gas at different pressure of cooling gas and quenching in oil at variable delay time of oil mixers. Design/methodology/approach: The research was carried out on real elements used in the automotive industry as elements of fuel pumps. FineCarb® vacuum carburizing technology was used in order to obtain optimal parameters of the surface layers. During quenching a variable related to the parameters of the quenching medium was introduced. For quenching in gas it was the pressure at which nitrogen was introduced into the cooling chamber, while for quenching in oil it was the time of mixers delay. The sample batch was laid out in accordance with the PPAP (Production Part Approval Process) requirements for the automotive industry. Microhardness and radial runout measurements were carried out on the samples and subjected to statistical analysis. Findings: The analysis of each hardening processes has showed that depending on the cooling medium used, different distortion values are obtained. The distortion value is significantly influenced by the parameters of the hardening process - gas pressure/oil mixers delay. With the proposed quenching parameters, there is no relationship between the location of the sample in the furnace chamber and the distortion value. The smallest hardening distortions were obtained as a result of the hardening process in gas at a gas pressure of 3 bar. Hardening in gas was characterized by the smallest scatter values of obtained results of radial runout. Research limitations/implications: Basing on the studies and analyses carried out in this work, it can be concluded that the introduction of gas quenching technology instead of oil quenching technology is justified qualitatively and economically alike. Hardening in gas was also characterized by the smallest scatter values of obtained results of radial runout. This is an extremely important technological and economic aspect, due to the cost of grinding processing. Practical implications: The automotive and aviation industries are putting ever greater demands on the quality of manufactured components while reducing costs. It requires optimization of technological processes from co-operators. In the case of hardening plants, the most important aspect is obtaining repeatable, precisely planned parameters of the carburized layer, as well as minimizing the negative phenomena that cause dimensional changes after hardening of elements. The tests allowed to determine the most effective hardening conditions in terms of obtained distortions and costs of eliminating distortions. However, the selection of the optimal parameters depends on whether the core hardness requirements are also determined. Originality/value: The conducted tests allowed to determine the most effective hardening conditions in terms of obtained distortions, costs of levelling distortions and a complete technological process for the automotive industry.

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Wstęp do analizy efektywności wybranych procesów nawęglania elementów lotniczych przekładni zębatych

80%

Małasiński A. , Kula P. , Pietrasik R. , Pawęta S.

Piece Przemysłowe & Kotły

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2013

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tom 11-12

28--31

PL

Prężnie rozwijający się w ostatnich latach przemysł lotniczy w dużej mierze przyczynił się do rozwoju nowoczesnych technologii obróbki kół zębatych [3,4,6,8].Powyższy rozwój wynika bezpośrednio z wymagań i oczekiwań klientów odnoszących się do potrzeb ciągłego rozwoju technologicznego silników lotniczych, który to z kolei wynika z: rozwoju (popularyzacji) przemysłu lotniczego, zwiększonych wymagań środowiskowych (strategia europa 2020, flight-path 2050 i icao), zwiększających się kosztów materiałów eksploatacyjnych (paliwa). W świetle powyższych wyzwań producenci elementów przekładni zębatych silników lotniczych bardzo często stają przed dylematem wyboru technologii obróbki cieplnej i cieplnochemicznej. Poniższe opracowanie przedstawia najważniejsze kryteria wyboru procesu nawęglania stali.

EN

The rapid growth of the aviation industry observed in the recent years has largely contributed to the development of modern technologies for gear wheel treatment [3, 4, 6, 8]. The development has been a direct result of the customers' standards and expectations regarding the need for a continuous technological advancement of aircraft engines, which in turn stems from: the growth (popularisation) of the aviation industry, stricter environmental regulations (Europe 2020 strategy, Flightpath 2050, ICAO), and the increasing cost of consumables (fuel). With these challenges in mind, manufacturers of gearbox components used in aircraft engines are frequently faced with the difficult choice of selecting heat and thermochemical treatment technologies. The following study discusses the most important criteria for choosing a steel carburising process.

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Nowa technologia nawęglania próżniowego PreNitLPC a nawęglanie konwencjonalne : porównawcza analiza kosztów

80%

Pawęta S. , Kula P. , Pietrasik R. , Olejnik J.

Przegląd Mechaniczny

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2010

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tom nr 9

19-22

6

PreNitLPC® przyszłościową alternatywą dla nawęglania stali

70%

Kula P. , Pietrasik R. , Dybowski K. , Pawęta S. , Korecki M.

Piece Przemysłowe & Kotły

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2011

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tom Nr 3

43--49

PL

Technologia próżniowego nawęglania stali posiada liczne zalety związane z ekonomią produkcji i jakością finalnych produktów tego procesu. Technologia ta jest także bardziej przyjazna środowisku w porównaniu do metod konwencjonalnych. Ale są też ograniczenia. Należą do nich konstrukcyjne niedostatki pieców

EN

The vacuum steel carburising technology offers numerous advantages in terms of the production economy and quality of final products. The technology is also more environmentally friendly than conventional methods. There are, however, certain limitations, such as furnace design shortfalls.