1、Designation:D828819Standard Test Method forComparison of Metalworking Fluids Using a Tapping TorqueTest Machine1This standard is issued under the fixed designation D8288;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t 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 describes a laboratory technique toevaluate the relative performance of metal removal fluids usingan instrume
3、nted tapping machine that measures and recordstorque.1.1.1 The method is applicable to all tap types,machiningspeeds,and alloys that can be fabricated into a test piece.Comparison can be made between different operating condi-tions or various types of fluids including straight and emulsi-fiable oils
4、,semi-synthetics and synthetic fluids(see Classifica-tion D2881).1.2 The values stated in SI units are to be regarded asstandard.1.2.1 ExceptionThe units for the threads of the tap,M6,are in metric thread units.1.3 This standard does not purport to address all of thesafety concerns,if any,associated
5、 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
6、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:2D2881 Classification for Metalw
7、orking Fluids and RelatedMaterialsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD5619 Test Method for Comparing Metal Removal FluidsUsing the Tapping Torque Test Machine(Withdrawn2016)3D6300 Practice for Determination of Precision and BiasData for Use in Test Methods for
8、 Petroleum Products andLubricantsD7778 Guide for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1488 Guide for Statistical Procedures to Use in Developingand Applying Test Methods3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology D4
9、175.3.2 Definitions of Terms Specific to This Standard:3.2.1 built up edge,nan accumulation of the materialbeing tapped which seizes or bonds to the cutting surface of thetap.3.2.2 cutting tap,nin metal removal,a machine toolwhich forms a thread by cutting and removing test piecematerial.3.2.2.1 Dis
10、cussionCutting taps form threads by removingmaterial as chips;less force is typically required and they aremore effective than forming taps for hard materials.3.2.3 datum mark(D),nan etched indication on the cornerof a machined test piece indicating that the adjoining sides aresquare or perpendicula
11、r.3.2.4 forming tap,nin metal removal,a machine tool thatforms a thread by displacing or deforming the test piecematerial.3.2.4.1 DiscussionA form tap is most effective in ductilematerials where metal can flow;no chips are removed.3.2.5 tool feed rate,nthe distance traveled by the tool at auniform r
12、ate divided by the number of spindle revolutionsduring which this travel occurs.3.2.5.1 DiscussionIn this method the tool feed rate is thedistance(mm)per second a cutting or forming tap(8.9)passesthrough a hole in a test piece(8.10).1This test method is under the jurisdiction of ASTM Committee D02 o
13、nPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.01 on Metal Removal Fluids and Lubricants.Current edition approved Dec.1,2019.Published January 2020.DOI:10.1520/D8288-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontac
14、t ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box
15、 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 Wo
16、rld Trade Organization Technical Barriers to Trade(TBT)Committee.4.Summary of Test Method4.1 The torque required to tap threads is measured for anumber of holes in a test piece lubricated with a metal removalfluid.These values are compared with the comparable torquesusing another fluid such as a reference fluid.The relativetapping efficiency is then calculated.5.Significance and Use5.1 This test method can be used to predict the comparativelubricating properties of a metalworking fluid(MWF).5.1.
