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沃尔沃螺钉标准STD_7121_279.pdf

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沃尔沃 螺钉 标准 STD_7121_279
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CorporateStandard STD7121 ,279 Dept/Issuedby 6857ReineBenjaminsson Issue 6 Established 200001 JB Page 1(7) TILLVERKNINGSBEST?MMELSER MANUFACTURINGSPECIFICATIONS G?ngpressandeskruvar Tappingscrews PFskruvaravseddaf?rplastmaterial PFscrewsintendedforplasticsmaterials Orientering Orientation Internationellellernationellmotsvarighettilldenna standardsaknas. Thereisnointernationalornationalequivalenttothis standard. Dennautg?vaskiljersigfr?nutg?va5genomf?ljande ?ndringar: Thisissuediffersfromissue5inthefollowing: Avsnitt3.1Yth?rdhet.Kravenhar?ndrats Section3.1Surfacehardness.Therequirements havebeenchanged Avsnitt3.2H?rdning.Kravharlagtstill Section3.2Hardening.Arequirementhasbeen added Avsnitt6.1Vridh?llfasthet.Kravenharsk?rpts Section6.1Torsionalstrength.Morestringent requirements Avsnitt6.2V?tespr?dhet.Sammanslagningav krav. Section6.2Hydrogenembrittlement.Mergingof requirements. Inneh?ll Contents 1 Omfattningochtill?mpning 1 Scopeandfieldofapplication 2 Material 2 Material 3 Metallurgiskakrav 3 Metallurgicalrequirements 3.1 Yth?rdhet 3.1 Surfacehardness 3.2 H?rdning 3.2 Hardening 3.3 K?rnh?rdhet 3.3 Corehardness 3.4 Mikrostruktur 3.4 Microstructure 4 Mekaniskakrav 4 Mechanicalrequirements 4.1 Vridh?llfasthet 4.1 Torsionalstrength 4.2 V?tespr?dhet 4.2 Hydrogenembrittlement 5 Provningsmetoderf?rdemetallurgiska kraven 5 Testmethodsforthemetallurgical requirements 5.1 Yth?rdhet 5.1 Surfacehardness 5.2 S?tth?rdningsdjup 5.2 Casehardeneddepth 5.3 K?rnh?rdhet 5.3 Corehardness 5.4 Mikrostruktur 5.4 Microstructure 6 Provningsmetoderf?rdemekaniskakraven 6 Testmethodsforthemechanical requirements 6.1 Vridh?llfasthet 6.1 Torsionalstrength 6.2 V?tespr?dhet 6.2 Hydrogenembrittlement 7 Dimensionskrav 7 DimensionalrequirementsSTD7121 ,279 CorporateStandard Page 2 Issue 6 1 Omfattningochtill?mpning 1 Scopeandfieldofapplication Dennastandardinneh?llertv?alternativautf?randen avskruvarmedg?ngoravseddaf?rmonteringiplast, utf?rande1ochutf?rande2.Dessatv?utf?randen skiljersigmedavseendep?g?ngprofilochh?rdning. D?rdetejframg?ravritningsunderlagetvilketut f?randesomskruvenskallha,st?rdetleverant?ren frittattv?lja. Omvarkenutf?rande1ellerutf?rande2anges,g?ller kravenf?rb?dautf?randena. Thisstandardcoverstwoalternativeversions,Design 1andDesign2,ofscrewswiththreadsdesignedfor assemblyinplastics.Thesetwodesignsdifferwith respecttothreadprofileaswellashardeningmethod. Ifthedesignofthescrewisnotspecifiedonthe drawing,thesupplierisfreetochoose. Ifneitherdesign1nordesign2hasbeenindicated, therequirementsapplytobothalternatives. 2 Material 2 Material Utf?rande1S?tth?rdat Skruvarnaskallvaratillverkadeavkallformningsst?l avs?tth?rdningskvalitetellersegh?rdningskvalitet. Design1Casehardenedgrade Thescrewsshallbemadefromcoldformingsteelofa qualitysuitableforcasehardeningorhardeningand tempering. Utf?rande2Segh?rdat Skruvarnaskallvaratillverkadeavkallformningsst?l avsegh?rdningskvalitet. Design2Hardenedandtemperedgrade Thescrewsshallbemadefromcoldformingsteelofa qualitysuitableforhardeningandtempering. 3 Metallurgiskakrav 3 Metallurgicalrequirements 3.1 Yth?rdhet 3.1 Surfacehardness Utf?rande1S?tth?rdat : Yth?rdhetenskallefters?tth?rdningvara –Vickers450HV0,3min.[3] Design1Casehardenedgrade : Thesurfacehardnessaftercasehardeningshallbe –Vickers450HV0,3min.[3] Utf?rande2Segh?rdat : Yth?rdhetenskalleftersegh?rdningvara –Vickers420HV0,3max.[3] Design2Hardenedandtemperedgrade : Thesurfacehardnessafterhardeningandtempering shallbe –Vickers420HV0,3max.[3] 3.2 H?rdning 3.2 Hardening Utf?rande1S?tth?rdat : S?tth?rdningsdjupetskallvaraenligttabell1. Design1Casehardenedgrade : Thecasehardeneddepthshallbeasgivenintable1. Tabell/Table1 G?nga Thread d S?tth?rdningsdjup Casehardeneddepth max[3] PF3 0,19 PF3,5 0,2 PF4 0,22 PF5 0,25 PF6 PF8 0,29 0,32 Utf?rande2Segh?rdat : – H?rdningenskallg?rasikontrolleradugnsatmosf?r f?rkolhalts?terst?llning. Design2Hardenedandtemperedgrade : – Thehardeningshallbeperformedincontrolledoven atmospheretorestorethecarboncontent. – Inkolningsdjupmax0,1mm. – Depthofcarbonrestoredzonemax0,1mmCorporateStandard STD7121 ,279 Issue 6 Page 3 3.3 K?rnh?rdhet 3.3 Corehardness Utf?rande1S?tth?rdat : K?rnh?rdhetenskallefterh?rdningvaramellan Vickers240och425HV0,3. Design1Casehardenedgrade : Thecorehardnessafterhardeningshallbebetween Vickers240and425HV0,3. Utf?rande2Segh?rdat : K?rnh?rdhetenskallefterh?rdningvaramellan Vickers320och380HV0,3. Design2Hardenedandtemperedgrade : Thecorehardnessafterhardeningshallbebetween Vickers320and380HV0,3. 3.4 Mikrostruktur 3.4 Microstructure Mikrostrukturenf?rintevisan?graferritiskaband mellanytaochk?rna. Themicrostructureshallshownobandsofferrite betweencaseandcore. 4 Mekaniskakrav 4 Mechanicalrequirements 4.1 Vridh?llfasthet 4.1 Torsionalstrength Skruvarnaskallvidprovningenligtavsnitt6.1motst? deitabell2angivnaminimimomentenutanattvridas av. Whentestedinaccordancewithsection6.1,the screwsshallwithstandtheminimumtorquesgivenin table2withouttorsionalfailure. 4.2 V?tespr?dhet 4.2 Hydrogenembrittlement Skruvarnaskallunder24hklaraprovningenligtav snitt6.2utanattbrottintr?ffar. Thescrewsshallbeabletowithstandtesting accordingtosection6.2for24hwithoutfailure occurring. 5 Provningsmetoderf?rde metallurgiskakraven 5 Testmethodsforthe metallurgicalrequirements 5.1 Yth?rdhet 5.1 Surfacehardness H?rdhetsprovenligtVickers STD1014,316 (ISO6507). Vickershardnesstestinaccordancewith STD 1014,316(ISO6507). H?rdhetsprovetskallutf?rasp?enplanyta,f?retr? desvisp?skruvhuvudet. Thehardnesstestshallbecarriedoutonaflatsur face,preferablyonthescrewhead. 5.2 S?tth?rdningsdjup 5.2 Casehardeneddepth Utf?rande1S?tth?rdat : S?tth?rdningsdjupetbest?msmikroskopisktiettslipat l?ngdsnittmittp?g?ngflankenmellanytterochinner diametern. Design1Casehardenedgrade : Thecasehardeneddepthshallbedetermined microscopicallyinagroundlongitudinalsectionatthe centreofthethreadflankbetweenthemajorand minordiameters. 5.3 K?rnh?rdhet 5.3 Corehardness K?rnh?rdhetsprovningenligtVickersskallutf?rasmitti radienp?etttv?rsnittgenomskruventagetp?etttill r?ckligtavst?ndfr?nskruvspetsenf?rattg?genom g?ngansfullainnerdiameter. Vickerscorehardnesstestshallbecarriedoutatthe midradiusofatransversesectionthroughthescrew takenatadistancesufficientlybehindthepointofthe screwtobethroughthefullminordiameter. 5.4 Mikrostruktur 5.4 Microstructure Mikrostrukturprovetskallutf?rasgenommetallografisk unders?kning. Themicrostructuretestshallbecarriedoutby metallographicexamination.STD7121 ,279 CorporateStandard Page 4 Issue 6 6 Provningsmetoderf?rde mekaniskakraven 6 Testmethodsforthemechanical requirements 6.1 Vridh?llfasthet 6.1 Torsionalstrength Skruvarnaskallisittleveranstillst?ndsp?nnasinien passandedelbarg?ngadhylsaellermotsvarandeut rustning.Deninsp?ndadelenavskruvenf?rinteska das.Minsttv?fullag?ngvarvskallstickauppovanf?r kl?manordningenochminsttv?komplettag?ngvarv f?rutomspetsenskallh?llasikl?manordningen.En insatsmedg?ngatbottenh?lf?ranv?ndasist?lletf?r kl?manordningenf?rutsattatth?letsdjup?rs?dantatt brottuppst?rovanf?rspetsen. Thescrewsshallintheirdeliveryconditionbeclamped inasuitablemating,split,threadeddieorcorrespond ingequipment.Theclampedportionofthescrewmust notbedamaged.Atleasttwofullthreadsshallproject abovetheclampingdeviceandatleasttwofullform threadsexclusiveofthepointshallbeheldwithinthe clampingdevice.Athreadedinsertwithablindhole maybeusedinplaceoftheclampingdeviceprovided thattheholedepthissuchthatthebreakagewilloccur abovethepoint. Medl?mplig,kalibreradmomentm?tutrustning,an bringasettmomenttillsdessbrottuppst?r.Skruvarna skallmotst?debrottmomentsomangesitabell2. Bymeansofasuitablecalibratedtorquemeasuring device,torqueshallbeappliedtothescrewuntil failureoccurs.Thescrewsshallmeetthefailure torquesgivenintable2. Fig.1 Tabell/Table2 G?nga Thread d Brottmoment Failuretorque Nmmin PF3 1,2 PF3,5 1,8 PF4 2,6 PF5 4,8 PF6 8 PF8 17,5CorporateStandard STD7121 ,279 Issue 6 Page 5 6.2 V?tespr?dhet 6.2 Hydrogenembrittlement Skruvenmonterasienf?rborradprovplatta(sefig.2) medett?tdragningsmomentenligttabell3. Thescrewshallbeassembledinapredrilledtest plate(seefig.2)usingatighteningtorqueasgivenin table3. Skruvg?ngansingreppsl?ngdiplattanskallvara2d 3d.Godsg?nganf?rejskjuvasav.Enmetalldistans medl?mpligl?ngdskallplacerasmellanplattaoch skruvhuvud. Theengagementlengthofthescrewthreadinthe plateshallbe2d3d.Thetappedholemustnotbe shearedoff.Ametalspacerofsuitablelengthshallbe placedbetweenplateandscrewhead. 1)Material: PVCEmodul/Modulusofelasticity >2400MPa( STD1024,2111 ) Fig.2 Tabell/Table3 G?nga Thread d H?ldiameter Holediameter D ?tdragningsmoment Tighteningtorque Nmmin PF3 2,4 1,2 PF3,5 2,8 1,8 PF4 3,2 2,6 PF5 4 4,8 PF6 4,8 8 PF8 6,4 17 D t 1 ) t=>3d D=enli gttabell3/aspertable3 ? STD7121 ,279 CorporateStandard Page 6 Issue 6 7 Dimensionskrav 7 Dimensionalrequirements Detfinnstv?olikautf?randenavg?ngor. Therearetwodifferentdesignsofthreads. Utf?rande1: Design1 : y P Fig.3 Tabell/Table4 G?ngad nom Thread min max PF3 3 3,14 PF3,5 3,5 3,68 PF4 4 4,18 PF5 5 5,18 PF6 6 6,18 PF8 8 8,22 Pstigning/pitch 1,34 1,57 1,79 2,24 2,69 3,59 d 1 min 1,63 1,89 2,14 2,65 3,16 4,21 yref1) 2,0 2,4 2,7 3,4 3,8 5,6 1)L?ngdavofullst?ndigg?nga/Lengthofincompletethread.CorporateStandard STD7121 ,279 Issue 6 Page 7 Utf?rande2: Design2: y P R A a A Fig.4 Tabell/Table5 G?ngad nom Thread min max PF3 3 3,1 PF3,5 3,5 3,6 PF4 4 4,1 PF5 5 5,15 PF6 6 6,15 PF8 8 8,15 Pstigning/pitch 1,35 1,55 1,75 2,25 2,65 3,50 d 1 min 1,9 2,22 2,55 3,19 3,84 5,12 Rnom 0,525 1,08 1,08 1,08 1,08 1,08 yref1) 1,4 1,6 1,8 2,3 2,7 3,6 a– 2,5 12,5 12,5 12,5 12,5 12,5 12,5
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