VW 01131-201803米制螺纹的钢制紧固件的摩擦系数的确定chs.pdf
DeterminationofCoefficientsofFrictionSteelVW01131
MechanicalFastenerswithMetricISOThreads版本2018-03
米制螺纹的钢制紧固件的摩擦系数的确定大众标准
Preface前言
Boltsandnutsareusuallytightenedinseveralstageswithafastpre-tighteningstageinordertoshortenassembly
time.Thefinaltighteningoperationisusuallyperformedwithreducedrotationalspeedandincreasinglyfrequently
alsowithtorque-to-yieldtighteningprocedures.Withlargeranglesofrotation,additionalfactorsthathaveanimpact
onfrictiontakeeffect.Externalstandardsandregulationsdonotsufficientlytakethisfactintoaccount.
为了缩短装配时间，螺栓和螺母通常分几个阶段紧固，预紧阶段要快。最后的拧紧操作通常以较低的转速进行，而且越
来越频繁地采用屈服力矩拧紧程序。当旋转角度较大时，影响摩擦力的其他因素也会产生影响。外部标准和法规没有充
分考虑到这一事实。
Thefriction-influencingfrictionpartnersoftheboltsandnutscanhaveverydiversesurfacetextures.Notevery
conceivablefrictionpairingcanbesimulatedinstandardizedtests.Verysmoothandcohesivesurfacesorsurfaces
thatareveryroughduetotheprocessingandmaterialstructurepresenttheirownchallenges.Moreover,surface
damagecanoccuronfastenedpaintedpartswhichleadstoextremefrictionconditionsandoftenproducesundesired
effects.Screwingboltsorscrewsintodeepthreadedholesmadeinsoftmaterialsplacesspecificdemandsonthe
coatingsystems.
螺栓和螺母的摩擦影响伙伴具有非常不同的表面纹理。并不是所有可能的摩擦配对都能在标准化测试中模拟出来。非常
光滑和粘性的表面或表面由于加工和材料结构而非常粗糙，这提出了它们自己的挑战。此外，表面损伤可能发生在固定
的涂漆部件上，导致极端的摩擦条件，并经常产生不希望的效果。将螺栓或螺钉旋进软材料制成的深螺纹孔中，对涂层
系统有特殊要求。
Forinstance,wheelboltsaretightenedinseveralstagesduringinstallation(tightening,loosening,andfinaltightening
stages).Multistagetighteningoperationsmustalsobetakenintoconsiderationwhenitcomestorework.Contraryto
standardizedlaboratorytests,seriesproduction