ASTM B439-2008 Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)《铁基粉末冶金(PM)轴承(油浸的)的标准规范》.pdf
《ASTM B439-2008 Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)《铁基粉末冶金(PM)轴承(油浸的)的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM B439-2008 Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)《铁基粉末冶金(PM)轴承(油浸的)的标准规范》.pdf(13页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 439 08Standard Specification forIron-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)1This standard is issued under the fixed designation B 439; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification covers porous metallic
3、 sleeve, flange,thrust, and spherical iron-base bearings that are produced frommixed metal powder utilizing powder metallurgy (PM) tech-nology and then impregnated with oil to supply operatinglubrication.1.2 Included are the specifications for the chemical, physi-cal, and mechanical requirements of
4、those ferrous PM materi-als that have been developed and standardized specifically foruse in the manufacture of these self-lubricating bearings.1.3 This specification accompanies Specification B 438/B 438M that covers the requirements for Bronze-Base PowderMetallurgy (PM) Bearings (Oil-Impregnated).
5、1.4 Typical applications for iron-base bearings are discussedin Appendix X1.1.5 Commercial bearing dimensional tolerance data areshown in Appendix X2, while engineering information regard-ing installation and operating parameters of PM bearings isincluded in Appendix X3. Additional useful informatio
6、n onself-lubricating bearings can be found in MPIF Standard 35(Bearings) and the technical literature.21.6 With the exception of density values for which theg/cm3unit is the industry standard, the values stated ininch-pound units are to be regarded as standard. The valuesstated in inch-pound units a
7、re to be regarded as standard. Noother units of measurement are included in this standard.1.7 The following safety hazards caveat pertains only to thetest methods described in this specification. This standard doesnot purport to address all of the safety concerns, if any,associated with its use. It
8、is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:3B 243 Terminology of Powder MetallurgyB 328 Test Method for Density, Oil Content, and
9、 Intercon-nected Porosity of Sintered Metal Structural Parts andOil-Impregnated BearingsB 438/B 438M Specification for Bronze Powder Metallurgy(P/M) Bearings (Oil-Impregnated)B 939 Test Method for Radial Crushing Strength, K,ofPowder Metallurgy (P/M) Bearings and Structural Materi-alsE9 Test Methods
10、 of Compression Testing of Metallic Ma-terials at Room TemperatureE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE 1019 Test Methods for Determination of Carbon, Sulfur,Nitrogen, and Oxygen in Steel and in Iron, Nickel, andCobalt Alloys2.2 MPIF Stan
11、dard:4MPIF Standard 35 Materials Standards for PM Self-Lubricating Bearings2.3 IEEE/ASTM Standard:3SI 10 American National Standard for Use of the Interna-tional System of Units (SI): The Modernized MetricSystem1This specification is under the jurisdiction of ASTM Committee B09 on MetalPowders and M
12、etal Powder Products and is the direct responsibility of Subcom-mittee B09.04 on Bearings.Current edition approved April 1, 2008. Published May 2008. Replaces portionsof B 612 and B 782. Originally approved in 1966 to replace portions of B 202. Lastprevious edition approved in 2007 as B 439 07.2Mach
13、ine Design Magazine, Vol 54, No. 14, June 17, 1982, pp. 130142.3For 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 websit
14、e.4Available from Metal Powder Industries Federations, 105 College Road East,Princeton, NJ 08540, http:/www.infompif.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United State
15、s.2.4 ISO Standard:5ISO 2795 Plain bearings from sintered metalDimensionsand tolerances3. Terminology3.1 DefinitionsThe definitions of the terms used in thisspecification are found in Terminology B 243. Additionaldescriptive information is available in the Related Materialssection of Volume 02.05 of
16、 the Annual Book of ASTMStandards.4. Classification4.1 This specification uses the established three-part alpha-numeric PM Material Designation Code to identify the ferrousmaterials used for self-lubricating bearings. The completeexplanation of this classification system is presented in AnnexA1.4.2
17、The following standard oil-impregnated iron-base bear-ing material compositions are contained in this specification:4.2.1 Prefix FIron Bearing Material:4.2.1.1 F-0000-K15Iron with 21 % oil.4.2.2 Prefix FIron-Carbon (Steel) Bearing Material:4.2.2.1 F-0005-K20Low carbon steel with 21 % oil.4.2.3 Prefi
18、x FCIron-CopperBearing Materials:4.2.3.1 FC-1000-K20Iron, 10 % copper with 22 % copperoil.4.2.3.2 FC-2000-K25Iron, 20 % copper with 22 % oil.4.2.4 Prefix FCTGIron-Bronze-Graphite (Diluted Bronze)Bearing Material:4.2.4.1 FCTG-3604-K22 Iron, 40 % bronze,34 %graphite with 17 % oil.4.2.5 Prefix FGIron-G
19、raphite Bearing Materials:4.2.5.1 FG-0303-K10Iron, 2 1/2 % graphite with 18 %oil.4.2.5.2 FG-0308-K16Steel, 2 % graphite with 18 % oil.5. Ordering Information5.1 Purchase orders or contracts for iron-base oil-impregnated PM bearings covered by this purchasing specifi-cation shall include the followin
20、g information:5.1.1 A copy of the bearing print showing dimensions andtolerances (Section 10),5.1.2 Reference to this ASTM specification, including dateof issue,5.1.3 Identification of bearing material by the PM MaterialDesignation Code (Section 4),5.1.4 Request for certification and test report doc
21、uments, ifrequired (Section 16),5.1.5 Type and grade of special lubricating oil, if required(6.2.3), and5.1.6 Instructions for special packaging, if required (Section17).6. Materials and Manufacture6.1 Porous Metallic Bearing:6.1.1 Porous iron-base bearings shall be produced by firstpreparing a mixt
22、ure of elemental iron powder with additions ofcopper, tin, pre-alloyed bronze or graphite powders to thespecified chemical composition and then compacting the pow-der mixture into a bearing configuration having the requiredgreen density6.1.2 The green bearings shall then be sintered in a furnacehavi
23、ng a protective atmosphere for a time and temperaturecycle that will produce the required sintered ferrous-base PMmaterial.6.1.3 After sintering, the iron-base bearings are normallysized to achieve the density, dimensional characteristics, con-centricity, and surface finish required of the finished
24、metallicbearing.6.2 Oil for Operating Lubrication:6.2.1 The interconnected or open porosity in the bearingsshall be filled to the required volume with lubricating oil, eitherby an extended soaking in the hot oil or preferably by a vacuumimpregnation operation.6.2.2 Amedium viscosity petroleum oil is
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