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Wyświetlanie 1-4 z 4
Tytuł:
Fatigue properties of nodular cast irons alloyed by Si, Mo and Cu
Autorzy:
Vaško, Alan
Krynke, Marek
Powiązania:
https://bibliotekanauki.pl/articles/88535.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
SiMo
SiCu
fatigue
żeliwo sferoidalne
zmęczenie
Opis:
In recent years, the research of nodular cast iron has been focused on increasing fatigue resistence. In the paper, two types of alloyed nodular cast irons have been investigated – SiMo-nodular cast iron alloyed by 4% of silicon and 1% of molybdenum and SiCu-nodular cast iron alloyed by 4% of silicon and 1.5% of copper. SiMo-nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines. SiCu-nodular cast iron is used in various components of tribotechnical units. These components are often loaded by fatigue. The mechanical and fatigue behaviour of both nodular cast iron types has been studied by means of tensile test, impact bending test, hardness test and fatigue tests. Fatigue tests were realised at low frequency cyclic push-pull loading up to 10 million cycles. The relationship between the amplitude of stress and number of cycles to failure was investigated and the fatigue strength was determined. Mechanical and fatigue properties of both nodular cast iron types are correlated with the microstructure of specimens.
Źródło:
System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 738-744
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Management the safety of exploitation of the rotation mechanism in a self-propelled crane
Autorzy:
Krynke, Marek
Vaško, Alan
Powiązania:
https://bibliotekanauki.pl/articles/88690.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
stability of cranes
slewing bearings
bearing capacity
stabilność dźwigów
łożyska wieńcowe
nośność podłoża
Opis:
The article analyzes of the load capacity of the rotation mechanism of the boom arm sub-assembly for a self-propelled crane. The uneven flexibility of systems supporting structures of the machine was taken into account in the identification of the load. The consideration are illustrated by the example slewing bearing from self-propelled crane. FEM method was used for calculations. The basic problems of construction of numerical model were discussed. Sample calculations of bearing carrying capacity has been done taking into account flexibility of bearings supporting structures, which also allowed to define the internal load distribution in the bearing. On example of the supporting structure of the mobile crane DST 5050 the internal load distribution in the crane bearing at different positions of the crane machine body were defined. During the rotation of the crane body priority angels were indicated. It has been shown that the deformations of the supporting frames are so large that they significantly change the distribution of forces transmitted by the individual bearing rollers.
Źródło:
System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 624-631
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the problem of staff allocation to work stations
Autorzy:
Krynke, Marek
Mielczarek, Krzysztof
Vaško, Alan
Powiązania:
https://bibliotekanauki.pl/articles/104023.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
work organization
multi-station work
linear programming
organizacja pracy
praca wielostanowiskowa
programowanie liniowe
Opis:
The proper organization of work is to set the workflow to the slightest effort of man and machine operation to obtain maximum results. The article presents the problem of the allocation of personnel that occurs in a real company. The mathematical model for this issue was formulated. An algorithm solving the problem of personnel allocation is presented. The proposed analysis is a starting point for determining the production capacity and load of each workstation, which is particularly important when using multi-station work and balancing the production line.
Źródło:
Quality Production Improvement - QPI; 2019, 1, 1; 545-550
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of accuracy and reliability of portable hardness testers
Autorzy:
Vaško, Alan
Sovík, Jan
Krynke, Marek
Powiązania:
https://bibliotekanauki.pl/articles/103951.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
hardness
Brinell
Vickers
Rockwell
Leeb
twardość
Opis:
The paper is focused on determination of the accuracy and reliability of static and dynamic (portable) hardness testers. The paper deals with the measurement of hardness of calibration hardness plates by 4 different methods (Brinell, Vickers, Rockwell and Leeb) with using 5 different hardness testers (3 static and 2 portable). The hardness values measured by the different hardness testers were compared to the reference hardness listed in the calibration hardness plates and consequently, the accuracy of these measurements was evaluated. The aim of the work has been to determine the accuracy and reliability of portable hardness testers in comparison with static hardness testers.
Źródło:
Quality Production Improvement - QPI; 2019, 1, 1; 289-295
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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