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Bearing grease deterioration M D Gafitanu

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Some influence parameters on greases lubricated rolling contacts service li

Some influence parameters on greases lubricated rolling contacts service life Some influence parameters on greases lubricated rolling contacts service life Farcas, F; Gafitanu, M.D 1999-04-01 00:00:00 The present tendencies in miniaturizing the equipment and the machine tools, decreasing the aircraft weight, avoiding the complicated oil cooling and lubricating systems, running the ball or ...

www.doctorat.tuiasi.

Elaboration of the new analytical model to estimate of the grease deterioration in the ball bearing applications; Analytical and experimental researches in order to optimize the geometry and lubncation of the high- ... D.N.Olaru and M.D.Gafitanu: Starvation in Ball Bearings, WEAR, 170

Selecting grease or oil - skf.c

Relubrication should occur frequently enough to avoid grease deterioration having an adverse effect on the bearing life. ... d m = bearing mean diameter [mm] = 0,5 (d + D) ... excess grease in the bearing distributes or escapes. At the end of the running-in period, the operating temperature drops, indicating that the grease has been distributed.

Starvation in ball bearings - ScienceDire

Wear, 170 (1993) 219-234 219 Starvation in ball bearings D.N. Olaru and M.D. Gafitanu Department of Machine Design and Tribology, lasi Polytechnic Institute, 6600 lasi (Romania) (Received March 18, 1993; accepted July 15, 1993) Abstract A complex analytical model for the starvation mechanism in ball-race contacts, in correlation with thermal effects, has been developed.

Steels for bearings - phase-trans.msm.cam.ac.

Lean Steels: Microstructure. Steels with carbon concentrations in the range 0.8-1.1 wt% and the total substitutional solute content less than 3 wt%, designed originally for machining tools, have historically dominated the mass market for bearings [ s10, 9].They can be made martensitic by quenching in oil or salt, from a temperature where the material is mostly austenite; the 1which also ...

BEARINGS GREASES SERVICE LIFE IN HIGH LOADING AND SEVERE .

BEARINGS GREASES SERVICE LIFE IN HIGH LOADING AND SEVERE ENVIRONMENT CONDITIONS M. GAFITANU, G.IANUS, and M. TIRON “Gh. Asachi” Technical University of Iasi, 61-63 Mangeron Blvd., 6600 Iasi, ROMANIA; e-mail: [email protected]

VIBRATION LEVEL OF BALL BEARINGS DETERMINED BY GREASE .

Grease degradation process study using vibration tests represents one of the future possibility to detect greases reserve life. 6 REFERENCES [1] Gafitanu, M.D., Ianus, G., Farcas, Fl., Olaru, D.N.” Grease Reliability in Ball Bearing Applications”, the 11th International Coll. Tribology, 1998, Esslingen

A Review Paper on Failure Analysis of Cylindrical Roller .

Farcas and Gafitanu (1999), carried out an experimental work to study the behaviour of two different greases in context with the wear of bearing. They analyzed the microstructure of greases and find that the lubricant film thickness decreases with the deterioration in grease fibroid structure.[2]

Bearing grease deteriorati

About 80% of bearing mountings are grease lubricated. This has many advantages, such as eliminating complicated oil cooling systems, and better organisation of the available space in machine tools and aircraft. However, the bearing service life is reduced by grease deterioration.

CORRELATION BETWEEN GREASE DEGRADATION AND VIBRATION LEVEL .

CORRELATION BETWEEN GREASE DEGRADATION AND VIBRATION LEVEL OF BALL BEARINGS M. D. GAFITANU, G. M. IANUS, F. TARABOANTA Technical University „Gh. Asachi“, Bul. D. Mangeron no. 61-63, 6600, Iasi, ROMANIA, e-mail: [email protected] SUMMARY Grease used to lubricate "for life" ball bearings of machines and industrial equipment, represents an ...

A n Institutul de Chimie Macromoleculară

“Electrical Properties Functioning Temperature Correlations For Rolling Bearing Greases Under The Influence Of The Electric Fields ... 10 M. C. Tiron, M.D. Gafitanu, F ...

Analytical Profiles of Drug Substances and Excipients .

Analytical Profiles of Drug Substances and Excipients EDITORIAL BOARD Abdullah A. Al-Badr Lee T. Grady Gerald S. Brenner Larry D. Kissinger Glenn A. Brewer

Einfluss von Oxidationsinhibitoren auf das .

Drehzahlkennwerten bis zu n⋅dm = 1,3⋅106 mm⋅min-1 ein. Beide Autoren stellten bei ihren Untersuchungen fest, dass die Reibmomente um den Faktor 5 bis 8 niedriger als die theoretisch nach Palmgren errechneten Werte waren. Zum einen führten sie dies auf die hohen Drehzahlen zurück, bei denen das Fett von den rotierenden Wälzlagerelementen

Molybdenum Disulphide Lubrication (Tribology and Interface .

M J D e ~ i n edemonstrated ’~~ a general relationship between the wear life of a molybdenum disulphide film and the chemical composition of a metal substrate. He carried out a detailed study using eighteen different substrate metals with a bonded film consisting of 71% molybdenum disulphide, 7% graphite, and 22% of sodium silicate as the binder.

Thermal Oxidation Mechanism of Polyalphaolefin Greases .

ABSTRACTIn this work, lithium and diurea greases formulated by poly-alpha-olefin were aged up to 1,200 h in an oven at 120°C and periodically taken out for testing. Scanning electron microscopy (SEM) and infrared (IR) spectra proved that both physical and chemical degradation occurred during the thermal aging process, such as a decrease in apparent viscosity, thickener destruction, and change ...

Bearing grease deterioration - Gafitanu - 2001 .

Bearing grease deterioration. M. D. Gafitanu. Department of Machine Design & Vibrations, Technical University ‘Gh. Asachi’ of lasi, Romania. Search for more papers by this author. F. Farcas. Department of Machine Design & Vibrations, Technical University ‘Gh. Asachi’ of lasi, Romania

Some influence parameters on greases lubricated rolling .

The present tendencies in miniaturizing the equipment and the machine tools, decreasing the aircraft weight, avoiding the complicated oil cooling and lubricating systems, running the ball or roller bearings in contaminated media or in the presence of the electric fields, determined a higher use of the lubricating greases in technical applications which is estimated at about 80% of the bearings ...

Bearing grease deterioration | M. D. Gafitanu - ResearchGa

About 80% of bearing mountings are grease lubricated. This has many advantages, such as eliminating complicated oil cooling systems, and better organisation of the available space in machine tools ...

ELECTRICAL PROPERTIES-FUNCTIONING TEMPERATURE CORRELATIONS .

ELECTRICAL PROPERTIES-FUNCTIONING TEMPERATURE CORRELATIONS FOR ROLLING BEARINGS GREASES UNDER THE INFLUENCE OF THE ELECTRIC FIELDS Mihai Tiron, “Gh. Asachi”Technical University of Iasi, Romania Mihai Gafitanu, “Gh. Asachi”Technical University of Iasi, Romania ... rolling bearing ball Bearings deterioration is strongly dependant on ...

M. D. Gafitanu's research works | Gheorghe Asachi .

M. D. Gafitanu's 7 research works with 28 citations and 433 reads, including: Lubrication safety in high‐speed ball‐bearings M. D. Gafitanu's research while affiliated with Gheorghe Asachi ...