VW 01131-201803米制螺纹的钢制紧固件的摩擦系数的确定chs.pdfVIP

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