卧式数控车床可靠性增长技术的分析与研究.pdf

宁夏大学硕士学位论文卧式数控车床可靠性增长技术的分析与研究姓名:杨明川申请学位级别:硕士专业:机械制造及其自动化指导教师:王春秀 20100501 ,这已经成为制约我国数控车床发展的瓶颈。因此,进行数控车床可靠性研究,迅速提高国产数控车床的可靠性水平,是加快发展我国数控车床产业急待解决的问题。本文以某机床厂的数控车床为研究对象, 对数控午床使用过程中出现的故障及其原因进行故障模式影响分析(Failure Mode EffectAnalysis, 简称FMEA)。首先根据乍床的结构将数控车床划分为九个系统,通过整机FMEA分析,找出对整机影响较人的子系统,从而了解数控车床的薄弱部位,进而对数控车床的九个子系统分别进行进一步的故障模式分析,找出此系列数控乍床发生故障的主要原因,并确定其不同原因的影响程度,为该系列数控车床可靠性的提高指出方向,进行可靠性的定性分析。然后对整机采崩可靠性框图建模,对子系统采用故障树建模,采取蒙特卡洛方法对整机和子系统进行改进前和改进后的仿真分析,从而定量所提出的改进措施,为可用性的提高提出判断依据。关键词:数控车床,可靠性,故障模式,仿真,蒙特卡洛蓼 Abstract Our C lathe industrial development isstilllargergap than C lathebetween levelofavailability hasbeen abottleneck restricting thedevelopment of a earnest porblem timthereliability C lathe and made quickly to improve the reliability ,machine C lathe are on aCNC lathe machine toolfactory inthisstudy,the use C lathesand theprocess ofbreakdown ofthec卸s器 failuremode and effectanalysis(Failure Mode Effect Analysis,referred toasFMEA).First,the structure willbeunder C lathe divide,d intonine machine FMEA analysis find agreaterimpact on themachine subsystem to understand theweak parts C lathe. Through thenine sub-system separately Further failuremode analysis tofind out thisseriesthemain r翰∞n forthe C lathe,and determine theimpact ofdifferent∞us岱for C lathes thatdirection toimprove thereliability andthereliability establish the reliability block diagram modeling toChIC paper establish thereliabilityblock diagram modeling forthesubsystem quantitative improve theproposed theeffectiveness of measures through adopt the Monte-Carlo Simulation before makes theim芦ovement and the improvement simulationanalysis plete machine and paper proposes thejudgment basisfortheusabilityenhancement. Key words:ChIC lathe,reliability,Failure Mode,Simulation,Monte Carlo; 独创性声明本人声明所呈交的论文是我个人在导师指导下进