ASTM A986 A986M-2001(2006) Standard Specification for Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings《连续晶粒流动曲轴锻件的磁粒子检验标准规范》.pdf
《ASTM A986 A986M-2001(2006) Standard Specification for Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings《连续晶粒流动曲轴锻件的磁粒子检验标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM A986 A986M-2001(2006) Standard Specification for Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings《连续晶粒流动曲轴锻件的磁粒子检验标准规范》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 986/A 986M 01 (Reapproved 2006)Standard Specification forMagnetic Particle Examination of Continuous Grain FlowCrankshaft Forgings1This standard is issued under the fixed designation A 986/A 986M; the number immediately following the designation indicates the yearof original adoption
2、or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the magnetic particle exami-nation of forged conti
3、nuous grain flow (CGF) crankshaftsintended for medium speed diesel engines.1.2 For the purpose of magnetic particle indication assess-ment, the crankshaft is divided into four zones of decreasingoperational stress. Acceptance criteria have been set for eachzone.1.3 The engines to which these cranksh
4、afts are fitted arecommonly used for diesel electric locomotives, marine propul-sion, and power generation. Engines fueled by natural gas alsofall into this medium speed category.1.4 Specification A 983/A 983M is a product specificationthat covers the manufacture of CGF crankshafts.1.5 The values st
5、ated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system shallbe used independently of the other. Combining values from thetwo systems ma
6、y result in nonconformance with the specifi-cation.2. Referenced Documents2.1 ASTM Standards:2A 788/A 788M Specification for Steel Forgings, GeneralRequirementsA 966/A 966M Test Method for Magnetic Particle Exami-nation of Steel Forgings Using Alternating CurrentA 983/A 983M Specification for Contin
7、uous Grain FlowForged Carbon and Alloy Steel Crankshafts for MediumSpeed Diesel Engines3. Ordering Information3.1 Specification A 983/A 983M requires that crankshaftsmade to that specification be examined in accordance withSpecification A 986/A 986M for magnetic particle examina-tion. It is the resp
8、onsibility of the purchaser to specify anychanges to the zone allocations for the crankshaft surfaces.4. Procedure4.1 Magnetic particle examination shall be conducted inaccordance with Test Method A 966/A 966M. The use of prodtype contacts is not permitted on finished crankshaft surfaces.Magnetic le
9、eches may be used only on flat noncritical surfaces,and within the limitations specified in Test Method A 966/A 966M.4.2 The magnetic particle examination shall be conductedusing the wet fluorescent method described in Test MethodA 966/A 966M.5. Areas of Examination5.1 Zone 1Major Critical Areas:5.1
10、.1 Crankpin JournalsThe major critical area of eachcrankpin journal shall include that area 660 from the 6 oclockposition of the crankpin and extend38 in. 10 mm above thefillet collar and58 in. 15 mm along the crankpin surface asmeasured from the blend of the fillet radius and the journalsurface. Th
11、ese positions are shown in Fig. 1.5.1.2 Main Bearing JournalsThe major critical areas ofany main bearing journal shall include that area 660 from the12 oclock position on top of the journal and extend38 in.10 mm above the fillet collar and58 in. 15 mm along thejournal as measured from the blend of t
12、he fillet radius and thejournal surface. These positions are shown in Fig. 1.5.1.3 Oil HolesThe major critical areas in also shallinclude the surfaces surrounding the journal oil holes. Thediameter of this critical area shall be 3d, where d is the oil holediameter before the radius. The critical are
13、a shall be centeredon the centerline of the oil hole. In addition, the Zone 1 criticalarea shall extend down the oil hole for a distance from thejournal surface equal to the hole diameter.5.2 Zone 2Minor Critical Areas:1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stai
14、nless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved March 1, 2006. Published April 2006. Originallyapproved in 1998. Last previous edition approved in 2001 as A 986/A 986M 01.2For referenced ASTM standards, visi
15、t 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
16、59, United States.5.2.1 The Zone 2 minor critical areas shall include thebalance of the fillet radii of the crankpin and main bearingjournals not included in the major critical areas.5.2.2 When counterweights are attached to the crankshaftwebs by welding, the weld surfaces and12 in. 13 mm of theadja
17、cent surfaces shall be considered minor critical areas.5.3 Zone 3Journal Running Surfaces:5.3.1 Zone 3 includes the remainder of the crankpin andmain bearing journal surfaces not covered by the major andminor critical areas.5.3.2 Zone 3 also includes the bearing journal surfaces forauxiliary drives,
18、 gear fit surfaces, keyways, and couplingflange radii.5.4 Zone 4All Other Areas:5.4.1 Zone 4 includes the crankpin web surfaces, excludingareas covered by the major and minor critical areas, flangefaces and periphery, and any other surfaces not included inZones 1, 2, or 3.6. Classification of Indica
19、tions6.1 Surface magnetic particle indications shall be classifiedas open or non-open.6.1.1 Open indications are defined as those being visibleafter removal of the magnetic particles under a minimum 5times optical magnification.6.1.2 Non-open indications are not visible after removal ofthe magnetic
20、particles.7. Acceptance Criteria7.1 Zone 1:7.1.1 Indications are not permitted and must be removed bygrinding or polishing. The original shape of the fillet must bemaintained, when indications have been removed. The blendedarea shall not be deeper than 0.006 in. 0.15 mm below theminimum drawing fill
21、et dimension for the location.7.1.2 The total area blended at less than the relevantminimum dimension shall not exceed 5 % of the major criticalarea of the particular crankpin or main bearing fillet ordesignated surface at an oil hole.7.2 Zone 2:7.2.1 Open indications are not permitted and must bere
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