MDESIGN-bolt-en(VDI2230计算公式)

CalculationofScrewsAccordingtoVDI2230,Edition2003Withthisprogramyoucancarryoutpredimensioningofthenominalscrewdiameter(extendedversiononly)aswellasthesystemcalculationofcylindricalscrew-injointsaccordingtoVDI2230,sheet1,editionof2003.Thewholecalculationprocessinvolvingforceanddeformationrelationsisbasedonthescrew-injointmodel.I.e.alldimensionsandloadsinfluencingthecompletejunctionfromtheoutsidearetobereducedtoascrew-injointandarepresumedasknown.Youcancalculatemultiscrewjoints,suchase.g.circularringjointflanges.Atthat,youmusttakeintoaccount,thattheangularmomentumappliedtotheperimeterhasbeenconsideredusingthenumberofscrewsonthepitchcircleandtheresultantloadshavebeenconsideredforeachscrewseparately.Inaddition,youcantakeintoaccountcentricandeccentrictightenings/loadings.Besides,thiscalculationprogramhasatitsdisposaltechnologyfileswhichenableyoutoreadscrewdimensions,differentstrengthclassesandmaterialsoftightenedpartsdirectlyintotheentrypage.Alldatabasetablescanbecustomizedtotheuser(e.g.otherstandards).Extremeworkingloads,e.g.corrosionorimpactloadscannotbetakenintoaccount.CalculationBaseThecalculationbaseofthemoduleCalculationofScrewsisfoundedonVDI2230,sheet1,editionofFebruary2003SystematischeBerechnunghochbeanspruchterSchraubenverbindungenZylindrischeEinschraubenverbindungen(SystemCalculationofHigh-loadedScrewJoints,CylindricalSingle-screwjoints).ThefixedtighteningforceFMofthescrewisconsideredatthatasthemainselectioncriterionofthenominalscrewdiameter.ThefollowingDINstandardshavebeenused,too:-DINENISO4017IssueofMarch2001SechskantschraubenmitGewindebisKopf(malehexagonscrewsthreadedtohead)-DINENISO8676IssueofMarch2001SechskantschraubenmitGewindebisKopfundmetrischemFeingewinde(malehexagonscrewsthreadedtoheadwithmetricfinethread)-DINENISO4014IssueofMarch2001SechskantschraubenmitSchaft(malehexagonscrewswithbody)-DINENISO8765IssueofMarch2001SechskantschraubenmitSchaftundmetrischemFeingewinde(malehexagonscrewswithbodyandmetricfinethread)-DINENISO4762IssueofFebruary1998ZylinderschraubenmitInnensechskant(cylindricalscrewswithinnerhexagon)-DINENISO4032IssueofMarch2001Sechskantmuttern,Typ1(femalehexagonscrews,type1)-DINENISO8673IssueofMarch2001Sechskantmuttern,Typ1,mitmetrischemFeingewinde(femalehexagonscrews,type1,withmetricfinethread)-DINENISO7089IssueofNovember2000FlacheScheiben,NormaleReihe,ProduktklasseA(Flatwashers,standardseries,productclassA)-DINEN20273IssueofFebruary1992DurchgangslöcherfürSchrauben(throughholesofscrews)-DIN13T1-10IssueofNovember1999MetrischesISO-Gewinde(metricISOthread)-DINEN10269IssueofNovember1999StähleundNickellegierungenfürBefestigungselementebeierhöhtenTemperaturen(steelsandnickelalloysforfasteningelementsathighertemperaturevalues)-DINENISO3506-1IssueofMarch1998MechanischeEigenschaftenvonVerbindungselementenausnichtrost.Stählen(stress-strainpropertiesofconnectivesmadeofstainlesssteels)-DIN267-13IssueofAugust1993MechanischeVerbindungselemente(mechanicallyconnectedelements)-DINENISO898-1IssueofNovember1999MechanischeEigenschaftenvonVerbindungselementenausKohlenstoff–undlegiertemStahl(stress-strainpropertiesofconnectivesmadeofcarbonandalloyedsteel)Specialreturns:-VDI-returnsNo.1644,2001Schraubenverbindungen(screwjoints)LimitationsThecalculationstepsarevalidforsteelscrewshavingthefasteningthreadwithaflankangleof60°.Serviceloadscanbegivenasstaticallyordynamicallyactingaxialforces.Inaddition,transverseforcesandservicemomentscanbeprovided,too.Allloadseffectingthejointandtheresultsconnectedwiththemarerelatedonlytoasingle-screwjoint.Thedimensionofthejunctureareainthelevelscrewaxis-effectlineoftheworkingforceislimitedbytheso-calledmeasureG.Theelasticflexibilityofthetightenedpartsispresumedaslinearvariable.I.e.,iftheaxialworkingforceexceedstheseparationforce,theflexibilityincreasesprogressivelyandthereisalooseconnection,whichcannotbecalculatedbythisprogram.Principally,workingtemperaturesforthescrewandthejointpartscanbeconsideredasexplicitdependingonthematerialchoiceintherangeof–270°C≤T≤700°C.Notice:Allstandarddatabankrecordsarestoredfrom+20°Canddependingonthechosenmaterialtillmaximal600°C!Thejarwasherscanbealsotakenintoaccountduringthecalculation.Itispresumedthen,thatonthenutsideandontheheadsidethedimensionsandthematerialsarethesame.CalculationofScrews-FormulaeSymbolsandTermsInputAD[mm2]Sealfaceak[mm]Distanceofthepretensionsurfacefromthepointofapplicationofforceonthebasicmembera[mm]Distanceofthepointofapplicationofforcefromtheaxis0-0ateccentricloadaA[-]Tighteningfactorb[mm]Widthoftheflexuralmember(basicmember)bGew[mm]Threadlength(ownscrewgeometry)bT[mm]WidthofthejuncturesurfacecB[mm]Lengthoftheflexuralmember(basicmember)cT[mm]LengthofthejuncturesurfaceDA[mm]EquivalentouterdiameterofthebasicmemberinthejunctureDA’[mm]EquivalentouterdiameteroverthejunctureDa[mm]InsidediameterofthenutbearingareaDhamax[mm]GrößterInnendurchmesserdermutter–bzw.einschraubgewindeseitigenAuflageflächeD1[mm]RootdiameterofthenutthreadDt[mm]Pitchdiameter(flange,ringjoint)DSV[-]Passingscrewjunctiond[mm]Nominalscrewdiameterda[mm]Inner