Wyniki wyszukiwania - BazTech

1

The evaluation of viscosity properties of engine oil – Marinol RG 1240 after working in various types of engines

Malinowska M.

Journal of KONES

|

2018

|

Vol. 25, No. 1

275--281

EN

The lubricating oils are a liquid substance, consisting of a base (mineral, synthetic or vegetable) and selected additives. They can used for lubricate internal combustion engines, so they called – engine oils. For proper functioning of the engine, lubricating oil have to fulfil basic requirements: the main function is to enable the formation of a film of oil between the moving parts which reduces friction and wear, assisting in cooling, keeping the compression ratio, reducing corrosion, filling in all micro ridges on the surface of cooperating components, sealing the combustion chamber etc. The most significant property of any lubricating oil is viscosity, which is the measure of its resistance to gradual deformation by shear stress or tensile stress. The important feature is that property of viscosity changes during the exploitation process of oil, it may increase and decrease. That is why, for engines it is important not only to choose the type of oil correctly but also to frequent monitor the viscosity. In the article, the author shows how the viscosity of marine engine oils changes after working in different types of engines. The experiments were conducted using the method of the rheometer Haake Mars III of Thermo Scientific. The samples of engine oil – Marinol RG 1240 were collected after various periods of use in three different engine types Cegielski- Sulzer.

2

Analysis of the influence of lubrication conditions on tool wear used in hot die forging processes

Hawryluk M., Gronostajski Z., Ziemba J., Dworzak Ł., Jabłoński P., Rychlik M.

Eksploatacja i Niezawodność

|

2018

|

Vol. 20, no. 2

169--176

EN

The study discusses the subject of lubrication in the processes of hot die forging with the consideration of the durability of forging tools and instrumentation. It presents a literature research as well as the authors’ own investigations of the effect of the use of cooling and lubrication agents, the amount of the dosage as well as the direction of its application, and also the factors influencing the tribological conditions. The lubrication devices and systems currently applied in the industry have been analyzed as well. On this basis, making use of their knowledge and experience, the authors have developed and constructed a lubricating device. The elaborated system, implemented into the industrial process, makes it possible to select and ensure the optimal tribological conditions of the process by way of controlling the amount and frequency of the applied lubricant dosage. It can constitute an alternative for the manual method of lubricant application, which is dependent on the human factor, or the fully automated, yet expensive, lubrication systems. The obtained test results point to potential possibilities of a permanent introduction of the constructed device also into other forging processes, through its integration with a manipulator. The proposed solution ensures more stability and higher repeatability of the lubrication conditions as well as increases the efficiency of the production process, thus significantly reducing the unit costs of the production of forgings.

PL

Praca dotyczy problematyki smarowania w procesach kucia matrycowego na gorąco z uwzględnieniem trwałości narzędzi i oprzyrządowania kuźniczego. Przedstawiono badania literaturowe oraz własne autorów dotyczące wpływu zastosowania środków smarno-chłodzących, ilości dawki i kierunku jej podawania oraz innych czynników wpływających na warunki tribologiczne. Przeanalizowano także obecnie stosowane w przemyśle urządzenie i systemy smarowania. Na tej podstawie autorzy w oparciu o wiedzę i doświadczenie opracowali i zbudowali urządzenie smarujące. Opracowany system, zaimplementowany do przemysłowego procesu pozwala na dobór i zapewnienie optymalnych warunków tribologicznych w procesie poprzez sterowanie ilością i częstotliwością podawanej dawki środka smarnego. Może być ono alternatywą dla manualnej metody nanoszenia środka smarnego, zależnej od czynnika ludzkiego lub w pełni zautomatyzowanych, lecz drogich systemów smarowania. Uzyskane wyniki badań wskazują na potencjalne możliwości wprowadzenia na stałe do pracy zbudowanego urządzenia także do innych procesów kucia poprzez integrację z manipulatorem. Zaproponowane rozwiązanie zapewnia większą stabilność i powtarzalność warunków smarowania oraz pozytywnie wpływa na zwiększenie wydajności procesu wytwarzania, a tym samym znacząco obniża jednostkowe koszty produkcji odkuwek.

3

Influence Of Redundancy And Ship Machinery Crew Manning On Reliability Of Lubricating Oil System For The Mc-Type Diesel Engine

Liberacki R.

Journal of Polish CIMAC

|

2007

|

Vol. 2, no 2

327-334

EN

Influence of redundancy and ship machinery crew manning on reliability of typical lubricating oil system for the MC – type diesel engine has been considered. The results of reliability calculations for the system with redundancy and without redundancy have been presented. Moreover, three training levels of crew have been taken account in those calculations: high, average and low.

4

Podstawy doboru kompozycji litowych smarów plastycznych z wypełniaczami do zautomatyzowanych układów smarowania maszyn

Czarny R.

Tribologia

|

2005

|

nr 4

33-44

PL

W pracy omówiono podstawy doboru kompozycji litowych smarów plastycznych, zawierających wypełniacze w postaci proszku PTFE, grafitu oraz MoS2 do smarowania węzłów tribologicznych maszyn za pomocą układów centralnego smarowania. Przedstawiono wyniki badań nad wpływem tych wypełniaczy (w ilości od 1 do 15%) na wartości naprężeń stycznych, powstających podczas przepływu kompozycji smarowych w przewodach centralnego smarowania. Badania te przeprowadzono przy różnych wartościach gradientów prędkości ścinania, co pozwoliło na ocenę przebiegu analizowanych zjawisk zarówno w warstwie przyściennej jak też w warstwach bardziej od ścianki oddalonych.

EN

A current tendency in the lubrication of highly loaded friction pairs is the use of lubricant compositions made of the base grease and different types of grease fillers. These are mostly solid lubricants like graphite and disulphide molybdenum, as well as pulverized plastics like PTFE powders. These substances enhance in a considerable way the load transfer capabilities of ordinary grease lubricants. There are many information concerning the tribological properties of these compositions in available textbooks and literature on the subject. Missing however are information on the rheological properties of these lubricants, which is gross deficiency when reflecting the ever increasing number of automated central lubrication system in today's use. The paper discusses the fundamentals of the selection of lithium grease lubricants with different fillers, like PTFE powder, graphite, disulphide molybdenum used for the lubrication of automated lubrication systems. The results of experimental work upon the influence of these fillers on the value of shearing stresses generated in these compositions when transported in central lubrication piping system were presented. The research was done at different values of the shearing velocity gradient, which permitted an evaluation of the analysed phenomena, both at the wall layer and in layers more distant from the wall. Lithium soap was used as a thickening agent in greases subjected to testing (a thickener employed in more than 50% of commercially available grease brands). Grease composition with one to fifteen percents of the filler contents were tested. The results of this research might be used for the maintenance of machines provided with a central lubrication system.