1、Designation:F266107(Reapproved 2015)Standard Test Method forDetermining the Tribological Behavior and the RelativeLifetime of a Fluid Lubricant using the Spiral OrbitTribometer1This standard is issued under the fixed designation F2661;the number immediately following the designation indicates the ye
2、ar oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the quantitative determinationof the
3、friction coefficient and the lifetime of oils and greases,when tested on a standard specimen under specified conditionsof preparation,speed,Hertzian stress,materials,temperature,and atmosphere,by means of the Spiral Orbit Tribometer(SOT).This test method is intended primarily as an evaluationof the
4、lifetimes of fluid lubricants under vacuum and ambientconditions.1.2 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestabl
5、ish appropriate safety and health practices and todetermine the applicability of regulatory limitations prior touse.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterF22 Test Method for Hydrophobic Surface Films by theWater-Break TestF2215 Specification for Balls,Bearing
6、s,Ferrous and Non-ferrous for Use in Bearings,Valves,and Bearing Appli-cationsG115 Guide for Measuring and Reporting Friction Coeffi-cients2.2 Anti Friction Bearing Manufacturers Association Stan-dards3ANSI ABMA ISO 3290(AFBMA Standard 10 Balls)3.Terminology3.1 Definitions:3.1.1 coeffcient of fricti
7、onthe dimensionless ratio of thefriction force between two bodies to the normal force pressingthese bodies together.3.1.2 fixed platestationary,horizontal flat plate,typicallythrough which a force(the“load”)is applied to the ball.3.1.3 friction coeffcient limitmaximum value that thefriction coeffici
8、ent is permitted to attain.3.1.4 guide platephysical element that deflects the ball toits original orbit radius.3.1.5 lubricant total amount mass of lubricant depositedon the entire ball surface at the beginning of the test.3.1.6 normalized lifetimenumber of ball orbits performeduntil the friction c
9、oefficient limit is reached divided by thelubricant total amount initially deposited on the ball.3.1.7 rotary plateflat plate rotating at a constant rateselected for the test.3.1.8 scrub zoneRegion of the balls orbit in which theball is in contact with the guide plate.3.1.9 spiral orbittrack traced
10、by the ball on the fixed androtating plates of the Spiral Orbit Tribometer.The track has aspiral shape.4.Summary of Test Method4.1 Alubricated ball is clamped between two parallel plates.One of the plates rotates up to 210 rpm,causing the ball to rollin a near-circular orbit,but is actually an openi
11、ng spiral.Aclamping force,the“load”,provides a chosen mean Hertzstress(typically 1.5 GPa).The system is targeted to operate inthe boundary lubrication regime due to the combination of thehigh load,the moderate speed,and the small amount oflubricant(approximately 50 g).The ball rolls and pivots in as
12、piral orbit and is maintained in the orbit by the guide plate.The ball slides on the rotating plate when it contacts the guideplate.The measured force exerted by the ball on the guide plateis used to determine the friction coefficient.The tribometerruns until the coefficient of friction rises to val
13、ues much largerthan the initial,steady value.At this point the initial charge of1This test method is under the jurisdiction of ASTM CommitteeF34 on RollingElement Bearings and is the direct responsibility of Subcommittee F34.02 onTribology.Current edition approved April 1,2015.Published July 2015.Or
14、iginallyapproved in 2007.Last previous edition approved in 2007 as F266107.DOI:10.1520/F2661-07R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document
15、 Summary page onthe ASTM website.3Available from American Bearing Manufacturers Association(ABMA),8221Old Courthouse Road,Suite 207 Vienna,Virginia 22182.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 lubricant has been depleted by tribo
16、degradation and the systemis running virtually unlubricated.The normalized lifetime isobtained from the number of spiral orbits completed beforereaching the chosen friction coefficient limit divided by thetotal lubricant mass on the ball at the beginning of the test.Aminimum of four tests per lubricant and test condition shall beperformed.Lubricants can be compared by calculating theiraverage normalized lifetimes for a given set of test conditions.5.Significance and Use5.1 Relevance of the Spira