【作者】 肖俊；

【导师】 杨建国；

【作者基本信息】 上海交通大学 ， 机械制造及其自动化， 2007， 硕士

【摘要】 我国数控机床制造水平与国外先进水平相比还有很大差距,主要反映在可靠性差、故障率高上。由于随着我国数控机床市场的不断扩大,许多国外品牌大量进入中国,国内企业要想和这些国外品牌竞争的话,必须提高国产数控机床的可靠性。数控机床可靠性的提高可以直接减少机床生产厂家的售后服务费用和三包费用以及机床使用厂家的停机损失、机床维修费用。国产数控机床可靠性的提高还可以抵制进口,扩大出口,增加外汇收入。所以此项研究的经济效益十分显著。本文对国内某机床厂某系列数控车床的故障信息进行分析,由故障数据拟合出故障间隔时间的概率密度函数和经验分布函数,假设服从威布尔分布,然后用最小二乘法进行线性回归分析,求出线性回归方程。再用相关系数法进行线性相关性检验,得出线性相关性显著。再用d检验法进行威布尔分布拟合的假设检验,得出该系列数控车床的故障间隔时间服从威布尔分布,并确定故障间隔时间概率密度函数和分布函数。最后求出可靠性指标MTBF,MTTR和A的大小。开发了一套数控机床可靠性信息管理系统。本系统采用Microsoft SQL Server 2000作为数据库软件,应用程序采用Delphi开发。本系统更多还原

【Abstract】 The manufacture level of domestic CNC machine tools is low compared to overseas advanced manufacture level mainly because for low reliability and high failure frequency. Many overseas brands are entering China along with the market expansion of domestic CNC machine tools. Domestic factories must enhance the reliability of domestic CNC machine tools when they compete with overseas brand. The reliability enhancement of CNC machine tools may directly reduce post-sale service expense of production factory and the loss of production suspension and maintenance cost of CNC machine tool users. The reliability enhancement of CNC machine tools also may resist the import, expand the export and increase the foreign exchange earnings. So, economic gain of the technology reseach is extremely remarkable.The article analyzes failure information of one series CNC lathes of a domestic factory. Fits probability density function and experience distribution function of time between failures. Proposes the hypothesis of obeying更多还原