ASTM_D_3704_-_96_2017.pdf

Designation:D370496(Reapproved 2017)Standard Test Method forWear Preventive Properties of Lubricating Greases Usingthe(Falex)Block on Ring Test Machine in OscillatingMotion1This standard is issued under the fixed designation D3704;the number immediately following the designation indicates the year 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 determination of wearproperties of lubricating greases by means of the Falexblock-on-ring friction and wear test machine.1.2 The values stated in SI units are to be regarded asstandard except where equipment is supplied using inch-poundunits and would then be regarded as standard.1.2.1 ExceptionThe metric equivalents of inch-poundunits given in such cases in the body of the standard may beapproximate.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1403 Test Methods for Cone Penetration of LubricatingGrease Using One-Quarter and One-Half Scale ConeEquipmentD2714 Test Method for Calibration and Operation of theFalex Block-on-Ring Friction and Wear Testing MachineG40 Terminology Relating to Wear and Erosion3.Terminology3.1 Definitions:3.1.1 coeffcient of friction,or f,nin tribology,thedimensionless ratio of the friction force(F)between twobodies to the normal force(N)pressing these two bodiestogether.or5F/N!(1)3.1.1.1 DiscussionA distinction is often made betweenstatic coeffcient of friction and kinetic coeffcient of friction.G403.1.2 friction force,nthe resisting force tangential to theinterface between two bodies when,under the action of anexternal force,one body moves or tends to move relative to theother.G403.1.3 kinetic coeffcient of friction,nthe coefficient offriction under conditions of macroscopic relative motion be-tween two bodies.G403.1.4 wear,ndamage to a solid surface,generally involv-ing progressive loss of material,due to relative motion betweenthat surface and a contacting substance or substances.G404.Summary of Test Method4.1 The tester is operated with a steel test ring oscillatingagainst a steel test block.Test speed,load,angle of oscillation,time and specimen surface finish and hardness can be varied tosimulate field conditions.4.2 The width of the wear scar,developed on the test blockfrom contact with the oscillating test ring,is measured.5.Significance and Use5.1 This test method is used to differentiate between greaseshaving high,medium,and low wear preventive propertiesusing oscillating motion.The user of this method shoulddetermine to his own satisfaction whether results of this testprocedure correlate with field performance or other bench testmachines.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.05 on Solid Lubricants.Current edition approved Nov.15,2017.Published December 2017.Originallyapproved in 1978.Last previous edition approved in 2012 as D370496(2012).DOI:10.1520/D3704-96R17.2For 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 Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.Apparatus6.1 Falex Block-on-Ring Test Machine with FrictionRecorder,3described in detail in Annex A1 and illustrated inFig.1.6.2 Falex Oscillating Drive Accessory,3described in detailin A1.6 and illustrated in Fig.2.6.3 Microscope,low-power(50 to 60)having sufficientclearance under objective to accommodate the test block.Itshould be fitted with a filar micrometer so that scar width maybe measured with accuracy of 60.01 mm.6.4 Timer,graduated in minutes and seconds.7.Reagents and Materials7.1 Test Rings,Falex Type S-10 or S-253SAE 4620carburize steel,having a hardness of 58 HRC to 63 H