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    Wyświetlanie 1-7 z 7
    Tytuł:
    Influence of welding time on quality of the friction welded joint of two dissimilar steels
    Autorzy:
    Ratković, N.
    Lazić, V.
    Arsić, D.
    Nikolić, R.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/114836.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    friction welding
    joint quality
    welding time
    friction time
    compacting time
    spawanie tarciowe
    jakość połączenia
    czas spawania
    czas tarcia
    Opis:
    There are several factors that influence the friction welding (FW) process, i.e. the quality of the welded joint, like the welding time, the contact pressure, the compacting pressure, the friction speed etc. The joining process is additionally complicated if the two different materials are to be welded to each other. The subject of research, presented in this paper, is the welding time of the FW process, since the level of axial and radial plastic deformation of the welded pieces and shortening of the welded part depend mainly on the welding time. The paper first presents some theoretical basics of the FW process and then, in the experimental part, the influence of the process duration is investigated. The two materials that the experimental samples were made of are the high-speed steel and the steel for tempering.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 1-11
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revitalization of the damaged machine parts by hard facing as a way of saving funds
    Autorzy:
    Lazic, V.
    Arsic, D.
    Nikolic, R.
    Mutavzic, M.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/111734.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    revitalization technology
    hard facing
    costs
    savings
    profitability
    loader's bucket teeth
    technologia rewitalizacji
    napawanie
    rentowność
    ładowarka
    Opis:
    The objective of the research, presented in this paper, was to demonstrate the superiority of the hard facing as the revitalization technology of various damaged machine parts. The analysis of the two different revitalization methods of the damaged machine parts is presented – the replacement of the damaged part by the new – spare part and reparation by hard facing. The comparison is done on the example of hard facing and replacing of damaged loader's teeth. The paper presents a method for calculating costs of the two revitalization technologies based on their profitability and their comparison. That method could be applied for similar calculations for any machine part, with smallest or no adjustments. The paper presents a verification of advantage of applying the hard facing as the machine parts reparatory technology with respect to the other revitalization technology. The savings realized by application of hard facing reparation of the loader's teeth reach 73.5 % for one set of teeth and 82.40per annum of the costs for purchasing the new spare parts. The analysis was conducted under an assumption that organization of the maintenance function is at the exceptionally high level so that the purchasing of the new part/repairing of the damaged one is always done in time. This idealized approach was adopted since in that way one obtains the least economic effects of the reparatory technology application with respect to replacing the part with the spare one. In any other case the economic effects would be significantly higher, namely even more positive in favor of the hard facing revitalization technology.
    Źródło:
    Production Engineering Archives; 2016, 12, 3; 9-13
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fracture analysis of the pulley of a bucket wheel boom hoist system
    Analiza pęknięć koła pasowego układu wciągarki Wysięgnika koła czerpakowego
    Autorzy:
    Bošnjak, S.
    Arsić, M.
    Savićević, S.
    Milojević, G.
    Arsić, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/301935.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    bucket wheel excavator
    pulley fracture
    experimental investigations
    FE stress analyses
    koparka kołowa
    pęknięcie koła pasowego
    badania doświadczalne
    analiza naprężeń metodą elementów skończonych
    Opis:
    This paper presents the results of the pulley fracture analysis. Experimental investigations confirmed that the chemical composition and basic mechanical properties of the pulley material, except the impact energy at a temperature of –20°C, meet the requirements of the corresponding standard. The impact energy value at the temperature of –20°C is for ≈45% lower than the prescribed value which has considerable influence on the appearance of the brittle fracture, especially having in mind the fact that the bucket wheel excavators operate at low temperatures. Metallographic examinations as well as magnetic particle inspections indicated that initial cracks in the welded joints occurred during the manufacture of the pulleys. Characteristic levels of the rope load cycle are obtained by using in-house software which includes the dynamic effects of the resistance-to-excavation. The FEA results pointed out that in the representative load cases the combinations of the mean stress and the alternating stress in the pulley critical zone lie considerably below the limit line of the modified Goodman’s diagram. The conclusion, based on the presented results, is that the fracture of the pulley appeared as the result of the ‘manufacturing-in’ defects.
    Artykuł przedstawia wyniki analizy pęknięć koła pasowego. Badania doświadczalne potwierdziły, że skład chemiczny oraz podstawowe właściwości mechaniczne materiału, z którego zostało wykonane koło pasowe, za wyjątkiem energii udaru w temperaturze –20°C, były zgodne z odpowiednią normą. Wartość energii udaru w temperaturze –20°C była o ≈45% niższa od wartości zalecanej, co ma znaczący wpływ na występowanie pękania kruchego, zwłaszcza gdy weźmie się pod uwagę fakt, że koparki kołowe są przeznaczone do pracy w niskich temperaturach. Badania metalograficzne oraz badania magnetyczno-proszkowe wykazały, że pęknięcie pierwotne w połączeniu spawanym pojawiło się już w fazie produkcji koła pasowego. Charakterystyczne poziomy cyklu obciążenia liny uzyskano stosując własne oprogramowanie, które uwzględnia dynamiczne oddziaływanie odporności na urabianie. Wyniki MES pokazały, że w przypadku obciążeń reprezentatywnych, wartości średniego naprężenia w funkcji naprężenia zmiennego w strefie krytycznej koła pasowego były znacznie niższe niż wartości graniczne wyznaczone na podstawie zmodyfikowanego wykresu Goodmana. Na podstawie otrzymanych wyników stwierdzono, że pęknięcie koła pasowego powstało wskutek wad produkcyjnych.
    Źródło:
    Eksploatacja i Niezawodność; 2016, 18, 2; 155-163
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of load and reinforcement content on selected tribological properties of Al/SiC/Gr hybrid composites
    Autorzy:
    Veličković, S.
    Miladinović, S.
    Stojanović, B.
    Nikolić, R. R.
    Hadzima, B.
    Arsić, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/111714.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aluminum alloy
    hybrid composites
    silicon carbide
    graphite
    particles
    stop aluminium
    węglik krzemu
    grafit
    kompozyty hybrydowe
    Opis:
    Hybrid materials with the metal matrix are important engineering materials due to their outstanding mechanical and tribological properties. Here are presented selected tribological properties of the hybrid composites with the matrix made of aluminum alloy and reinforced by the silicon carbide and graphite particles. The tribological characteristics of such materials are superior to characteristics of the matrix – the aluminum alloy, as well as to characteristics of the classical metal-matrix composites with a single reinforcing material. Those characteristics depend on the volume fractions of the reinforcing components, sizes of the reinforcing particles, as well as on the fabrication process of the hybrid composites. The considered tribological characteristics are the friction coefficient and the wear rate as functions of the load levels and the volume fractions of the graphite and the SiC particles. The wear rate increases with increase of the load and the Gr particles content and with reduction of the SiC particles content. The friction coefficient increases with the load, as well as with the SiC particles content increase.
    Źródło:
    Production Engineering Archives; 2018, 18; 18-23
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reparation of damaged forging dies by hard facing (HF) technology
    Autorzy:
    Lazic, V.
    Arsic, D.
    Nikolic, R. R.
    Aleksandrovic, S.
    Milosavljevic, D.
    Djordjevic, M.
    Cukic, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/111606.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    forging dies
    hard facing (HF)
    filler metals (FM)
    hardness
    microstructure
    matryce kuźnicze
    napawanie
    spoiwa
    twardość
    mikrostruktura
    Opis:
    The forging dies are in exploitation exposed to elevated temperatures and variable impact loads, both compressive and shear. Steels for manufacturing of these tools must endure those loads while maintaining mechanical properties and being resistant to wear and thermal fatigue. For those reasons, the alloyed steels are used for making the forging dies, though they have less weldability, because alloying increases proneness to hardening. Any reparatory hard facing (HF) of the damaged dies would require the specially adjusted technology to the particular piece. In this paper reparatory hard facing of dies used for forging pieces in the automobile industry is considered. Prior to reparatory hard facing of the real tools, numerous experimental hard facings on models were performed. All the model hard facings were done on the same steels which were used for production of the real forging dies. To define the optimal hard facing technology one needs to derive the optimal combination of the adequate heat treatment(s), to select the proper filler metals and the welding procedure. The established optimal HF technology was applied to real forging dies whose service life was further monitored in conditions of exploitation.
    Źródło:
    Production Engineering Archives; 2015, 6, 1; 26-29
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of the Hard-Facing Technology Application for Reparation of the Given Parts in Various Branches of Industry
    Autorzy:
    Lazić, V.
    Arsić, D.
    Mutavdžić, M.
    Nikolić, R.
    Meško, J.
    Radović, L.
    Ilić, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2064968.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    regeneration
    hard-facing
    friction
    wear
    machine parts
    Opis:
    This paper deals with the problem of defining the optimal procedure for reparation of the machine parts of large dimensions and complex shapes. The procedure consists of establishing the causes of the part's damages, definition of the reparation technology, with selection of its parameters and ways of execution. The reparation is done by hard-facing, with heat treatment that consists of preheating, additional heating and the post hard-facing tempering. The process parameters' selection includes choosing the right filler metal(s), ways and order of depositing the hard-faced layers, ways of reaching and maintaining the preheating temperatures, checking of the base metal's chemical composition and mechanical properties and deciding on the post-process heat and mechanical processing of the executed hard-facing. The executed reparation of the forging hammer's mallet, presented in details, serves as an example how the reparation can successfully serve as a substitute for procuring the new part and thus producing the savings both directly in lower costs and indirectly in shortening the down-time of the damaged part operation.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 279--285
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First steps towards national radon action plan in Serbia
    Autorzy:
    Udovičić, V.
    Maletić, D.
    Eremić Savković, M.
    Pantelić, G.
    Ujić, P.
    Čeliković, I.
    Forkapić, S.
    Nikezić, D.
    Marković, V. M.
    Arsić, V.
    Ilić, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148086.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    action plan
    survey
    Opis:
    Radon problem has a special attention in many countries in the world and the most of them have established national radon programmes. The radon issues in Serbia have not been approached in a systematic and organized way. Currently, there are many research groups and institutions working in radon fi eld, and it is a good basis to integrate all these activities into a comprehensive national programme to defi ne the strategic objectives and action plan for the next few years. Also, Serbia as a candidate for membership in the EU is obliged to harmonize its legislation, including the fi eld of radiation protection in which the radon issues has an important role. In this report, a brief history of radon research, present status and plans for the future activity on radon issues in Serbia are presented. Regarding the long-term plans, the establishment and implementation of the Radon Action Plan with the primary goal of raising awareness about the harmful effects of public exposure to radon and implementing a set of measures for its reduction. In that sense, the synergy between the national, regional and local organizations responsible for public health and radiation protection must be achieved.
    Źródło:
    Nukleonika; 2016, 61, 3; 361-365
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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