Angular momentum pumps are very often applied on-board ships. These pumps are used in cooling circuits of medium and high power engines, power plant boilers as well as bilge, ballast and fire installations. Such an extensive use of angular momentum pumps on board is connected with their numerous advantages. However, during operation the wear of marine hull, the rotor and shaft seals take place. The research attempts to increase the service life of shafts.The article presents the research results referring to the analysis of the influence of finish treatment (finishing turning, grinding, burnishing) on the friction properties of steel applied to marine pump shafts. The research was performed on a roller 39 mm in diameter made of 304L stainless steel. The finish tooling of pump shaft pins was carry out on a universal centre lathe. The finish turning process was carried out by means of a WING WF 080408 Sandvik Coromant cutting tool with replaceable inserts. The grinding process was performed by grinding attachment for lathes. The 1 -80x10x32 -99C 80-N V grinding wheel was used for the process. The process of burnishing was done by SRMD single roll burnishing tool by Yamato. The burnishing process was carried out at the following technological parameters: burnishing force 1.1 kN, burnishing speed 35 m/min, feed 0.13 mm/rev. In addition, the influence of the number of burnishing tool passes on the friction was determined. The paper will present the research results of test on the friction properties examination of samples after finish machining. The experiment was performed on T-05 block-on-ring wear tester.
Angular momentum pumps are very often applied in ships. Because the pumps are operating in hard conditions they are produced from cavitation wear-proof and electrochemical corrosion-resistant materials. The most common damage of pump shaft is neck wear in place where seals are mounted. Burnishing as modern finish plastic tooling method makes it possible to achieve high technological quality of elements. Due to many burnishing advantages, the method was proposed for treatment of angular momentum pumps shafts instead of finish machining (finish turning, grinding, lapping). The goal was to estimate optimal burnishing parameters that enable obtaining higher strength and the lowest roughness factor of angular momentum pumps shafts. Shaft necks were made of stainless steel type X5CrNi1810. Roller burnishing tool SRMD type produced by Yamato was used in the research work. Its axis was parallel to working shaft axis. During working, technological parameters such as force, velocity and feed were changed.
Angular momentum pumps are frequently applied in marine installations. Due to hard working conditions of these pumps, special corrosion wear resistant materials as well as the ones resistant to electrochemical corrosion caused by sea water are used for their production. In case of pump shafts the most frequent inefficiency is the pin wear (corrosive wear, friction wear and contact wear) in place of sealings assembly (throttle). Burnishing as finish plastic tooling method enables obtaining machine elements of proper technological quality. Bearing in mind numerous advantages of using burnishing, it is suggested to apply it instead of machining (finish turning, grinding, polishing) to the shafts of marine angular momentum pumps. The burnishing process was carried out by SRMD single roll burnishing tool by Yamato. The object of the paper was to determine the influence of burnishing parameters and the number of burnishing tool passes on the improvement of roughness, plastic deformation and the shape deviation of marine pumps crank pins.Keywords: burnishing, surface layer, stainless steel, angular momentum pump Streszczenie: W instalacjach okrĊtowych czĊsto wykorzystywane są pompy wirowe. Ze wzglĊdu na trudne warunki ich pracy do budowy tego rodzaju pomp stosuje siĊ materiaáy odporne na zuĪycie erozyjne oraz korozjĊ elektrochemiczną wywoáaną przez wodĊ morską. W przypadku waáów pomp najczĊstszą niesprawnoĞcią jest zuĪycie czopów (korozyjne, cierne i zmĊczenie stykowe) w miejscu montaĪu uszczelnieĔ (dáawic). Obróbka nagniataniem jako metoda wykaĔczająca obróbki plastycznej umoĪliwia uzyskanie elementów maszyn o odpowiedniej jakoĞci technologicznej. W związku z licznymi korzyĞciami stosowania obróbki nagniataniem proponuje siĊ jej zastosowanie w zamian za wykaĔczającą obróbkĊ skrawaniem (toczenie wykaĔczające, szlifowanie, polerowanie) do waáów okrĊtowych pomp krĊtnych. Proces nagniatania przeprowadzono nagniatakiem jednorolkowym SRMD firmy Yamato. Celem pracy byáo okreĞlenie wpáywu parametrów nagniatania i liczby przejĞü nagniataka na poprawĊ chropowatoĞci, odksztaácenie plastyczne i odchyáek ksztaátu czopów waáów pomp okrĊtowych. Sáowa kluczowe: nagniatanie, warstwa wierzchnia, stal nierdzewna, pompy krĊtne.
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