1、BRITISH STANDARD AEROSPACE SERIES BS EN 3848:2001 Semi-finished metallic products Methods of measuring form deviations The European Standard EN 3848:2001 has the status of a British Standard ICS 49.035 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 3848:2001 This British
2、 Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 23 October 2001 BSI 23 October 2001 ISBN 0 580 38607 4 National foreword This British Standard is the offic
3、ial English language version of EN 3848:2001. The UK participation in its preparation was entrusted to Technical Committee ACE/61, Inspection and testing requirements for aerospace metallic materials, which has the responsibility to: A list of organizations represented on this committee can be obtai
4、ned on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” fa
5、cility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obli
6、gations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This
7、document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD
8、NORMEEUROPENNE EUROPISCHENORM EN3848 September2001 ICS49.035 Englishversion AerospaceseriesSemifinishedmetallicproductsMethodsof measuringformdeviations SriearospatialeDemiproduitsmtalliquesMthodes demeasuredesdfautsdeforme LuftundRaumfahrtMetallischesHalbzeug MeverfahrenfrFormabweichungen ThisEurop
9、eanStandardwasapprovedbyCENon2May2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonap
10、plicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmember
11、sarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG Mana
12、gementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3848:2001EEN3848:2001(E) 2 Foreword ThisEuropeanStandardhasbeenpreparedbytheEuropeanAssociationofAerospaceManufacturers (AECMA). Afterinquiriesandvotescar
13、riedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspresentationtoCEN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorseme
14、nt,atthelatestbyMarch2002,andconflictingnationalstandardsshallbewithdrawnat thelatestbyMarch2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,German
15、y,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal, Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN3848:2001(E) 3 1 Scope Thisstandardspecifiesthemethodsofmeasuringdeviationsfromthenominalformofsemifinishedmetallic productsforaerospaceapplications. Thisstandarddoesnotapplyto: extru
16、dedsections:seeEN2066; foldedsections:seeEN2065. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendment
17、stoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. EN2065 FoldedprofilesAluminiumalloysGeneraltolerancesAerospaceseries EN2066 AerospaceseriesExtrudedsectionsinalumini
18、umalloysG eneraltolerances ISO1101 Technicaldrawings,geometricaltolerancing;tolerancesofform,orientation,locationand runout;generalities,definitions,symbolsofdrawings 3 Measuringcondition Thedimensionsshallbemeasuredusingmeasuringinstrumentswhichareoftheaccuracyrequiredbythe dimensionsandthedimensio
19、naltolerances. Alldimensionsshallbecheckedattheambienttemperatureoftheworkshoporlaboratory,and,intheevent ofdispute,atatemperaturebetween15Cand25C. Surfaceplatesusedforthemeasurementofformdeviationsshallbeflattowithin 1%oftherequisite productformdeviationbeingmeasured. 4 Sheetandplate 4.1 Squareness
20、 Thesquarenessdeviationshallbemeasuredasthedifferenceinlengthofdiagonals AAand BBasshownin figure1. 4.2 Lateralcurvature Thelateralcurvature(F)shallbemeasuredasindicatedinfigure2,withthesheetorplaterestingona horizontalsurfaceplate.EN3848:2001(E) 4 4.3 Flatness 4.3.1 Flatnesstolerancezone SeeISO1101
21、. Thetolerancezoneislimitedbytwoparallelplanesadistance“t“apart. Theareashallbebetweentwoparallelplaneswithdistance“t“. Seefigure3. 4.3.2 Measurement Deviationfromflatness( f)resultingfromarching,bucklingoredgewaves,shallbemeasuredasshownin figures4to6,usingalightweightstraightedgeandafeelergauge,di
22、algaugeorscale,withthesheetor platerestingonahorizontalsurfaceplateconcavesideupwards,exceptwhenthesizeoftheproduct precludesthis. 5 Roundbar 5.1 Straightness Deviationfromstraightness( Y 1 )permetreoftotallength( X 1 ),expressedinmm/m,and( Y 2 )onanylength (X 2 ),asspecifiedinthedimensionalstandard
23、,shallbemeasuredasshowninfigure7,withthebarplacedon asurfaceplatesothatitsmassminimizesthedeviation. 5.2 Roundness Roundnessdeviationshallbemeasuredasthedifferencebetweenthemaximumandminimumdiametersat thesamecrosssection. 6 Hexagonalbar 6.1 Straightness Deviationfromstraightness( Y 1 )permetreoftot
24、allength( X 1 ),expressedinmm/m,and( Y 2 )onanylength (X 2 ),asspecifiedinthedimensionalstandard,shallbemeasuredasshowninfigure7,withthebarplacedon asurfaceplatesothatitsmassminimizesthedeviation. 6.2 Twist Twist( v)shallbemeasuredasshowninfigure8,withthebarplacedonahorizontalbaseplatesothatits mass
25、minimizesthedeviation. Twististhemaximumdistance,atanypointalongthemeasuringlengthbetweenthebottomsurfaceofthe barandthesurfaceplate. 6.3 Surfaceflatness Surfaceflatness( F)shallbemeasuredonallfacesasshowninfigure9.EN3848:2001(E) 5 7 Squareandrectangularbar 7.1 Straightness Deviationfromstraightness
26、( Y 1 )permetreoftotallength( X 1 ),expressedinmm/m,and( Y 2 )onanylength (X 2 ),asspecifiedinthedimensionalstandard,shallbemeasuredasshowninfigure7,withthebarplacedon asurfaceplatesothatitsmassminimizesthedeviation. 7.2 Twist Twist( v)shallbemeasuredasshowninfigure10,withthebarplacedonahorizontalpl
27、atesothatitsmass minimizesthedeviation. Thetwististhemaximumdistance,atanypointalongthemeasuringlengthbetweenthebottomsurfaceof thebarandthesurfaceplate. 7.3 Squareness Thesquarenessdeviation( z)shallbemeasuredasshowninfigure11. 7.4 Surfaceflatness Surfaceflatness( F)shallbemeasuredonallfacesasshown
28、infigure12. 8 Circulartube 8.1 Straightness Deviationfromstraightness( Y 1 )permetreoftotallength( X 1 ),expressedinmm/m,and( Y 2 )onanylength (X 2 ),asspecifiedinthedimensionalstandard,shallbemeasuredasshowninfigure7,withthetubeplaced onasurfaceplatesothatitsmassminimizesthedeviation. 8.2 Roundness
29、 Roundnessdeviationshallbemeasuredasthedifferencebetweenthemaximumandminimumoutside diametersatthesamecrosssection,seefigure13. 8.3 Eccentricity Eccentricity(t)shallbemeasuredashalfthedifferencebetweenthemaximumandtheminimumwall thicknessatthesamecrosssection,asshowninfigure14.EN3848:2001(E) 6 Figur
30、e1Squarenessofsheetandplate F lateralcurvature lengthofthesheetorplate b widthofthesheetorplate Figure2Lateralcurvatureofsheetandplate Figure3DefinitionofflatnessEN3848:2001(E) 7 a thicknessofthesheetorplate b widthofthesheetorplate l lengthofthesheetorplate w lengthofthewave f deviationfromflatness
31、 t tolerancezone(spacebetweentwoparallelplanes) f max. maximumacceptabledeviationfromflatness t a f max. Figure4Archingofsheetandplate f deviationfromflatness W lengthofbuckle(chord) Figure5BucklingofsheetandplateEN3848:2001(E) 8 f deviationfromflatness W lengthofedgewave(chord) Figure6Edgewavesofsh
32、eetandplate Y1 deviationfromstraightnessontotallength X1 Y2 deviationfromstraightnessonlength X2 Figure7Deviationfromstraightnessofbarandtube v twist a acrossflatofthebar Figure8TwistofhexagonalbarEN3848:2001(E) 9 F deviationfromsurfaceflatness a acrossflatofthebar Figure9Surfaceflatnessofhexagonalb
33、ar v twist a thicknessofthebar Figure10Twistofsquareandrectangularbar z squarenessdeviation Figure11SquarenessdeviationofsquareandrectangularbarEN3848:2001(E) 10 F deviationfromlateralflatness a thicknessofthebar b widthofthebar Figure12Surfaceflatnessofsquareandrectangularbar Roundnessdeviation D m
34、ax. D min. D max. maximumoutsidediameterofthetube D min. minimunoutsidediameterofthetube Figure13Roundnessofthetube t eccentricity a max. maximumwallthicknessofthetube a min. minimumwallthicknessofthetube t 2 min. max. a a Figure14EccentricityoftubeBS EN 3848:2001 BSI 389 Chiswick High Road London W
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