机车制动盘螺栓安全性分析研究

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中图分类号： U270.35+1 文献标志码：B doi：10.20214/.cnki.zhdt.2025.01.0

SafetyAnalysisandResearchonLocomotiveBrakeDiscBolt

HUANGMingao，WANGShoubing，XIONG Wenhua，SHENQiangjun，HUANGX （CRRCZhuzhouElectricLocomotiveCo.，Ltd.，Zhuzhou，China）

Abstract：The mechanical properties，chemicalcomposition，hardnes，fracture morphology and metalographyofdomesticboltsforlocomotivebrakediscs weretestedandanalyzed.The mechanical properties，chemicalcompositionandhardnes ofbrokenboltsalmettherequirementsofrelevantstandards. Thefracturemorphologyandmetalographictestingindicatedthatitwasafatiguefractureresultingfromthe loseningofboltsduringservice.ThetheoreticalcalculationiscariedoutacordingtoGermanVDI230 standard，andtheresultshowedthatthedesignandselectionofbrakediscboltsmettherequirements. Meanwhile，thefrictioncoeficientoftwodomesticbrakediscboltsandKnor brakediscboltswastestedand comparedwiththetestequipment.Itwasfoundthatheendfacefrictioncoeficient，threadfrictioncoeficient andasemblypreloadofbrakediscboltsprovidedbyKnor weretheclosesttothetheoreticalcalculation values，whiletheendfacefrictioncoeficientandthreadfrictioncoeficientofdomesticsuplier2wereto large，andtheasemblypreloadwasto smal，resultingintheloseningandbreakingofbrakediscboltsin service.Finaly，thesethre brakediscboltshavebentestedforresidualtorqueandthetighteningprocesis optimized.

Keywords：brakedisc;VDI230;frictioncoeficient;residualtorque;torquedecay

机车制动盘安装由制动盘、定位销、弹性套、螺栓、防松螺母、O 型圈等主要零件组成（图1），制动盘为整体盘，在摩擦面的反面铸有散热筋。（剩余4701字）