Abstract:

The problem of poor reliability of domestic NC machine tool was studied herein. Starting with modeling and analyzing the failure rate bathtub curve of NC machine tool,the zone of early failures was quantified.Based on in-deep analyzing the causes of early failures and systematically elaborating the mechanism of early fault elimination technology which combined with reliability test technology, early fault elimination technology systems were established and their ideas,methods and contents were elaborated respectively in the stage of failure collection,fault analysis,reliability test and fault elimination.Finally, according to the application of this technology to a NC machine tool manufacturing enterprise in China, the case demonstrates its effectiveness to improve the product reliability.

Key words: early failure, bathtub curve, NC machine tool, reliability analysis, reliability test

摘要：

针对国产数控机床可靠性差的问题,从故障率浴盆曲线建模分析入手,量化确定了机床的早期故障区,深入分析了早期故障产生的原因,结合可靠性试验技术,阐述了早期故障消除技术的机理,在此基础上建立了早期故障消除的技术体系, 阐述了早期故障消除过程,即故障收集、故障分析、可靠性试验、故障消除阶段的研究思路、内容和方法。最后将该技术运用到数控机床生产企业,案例表明,该技术可以有效提高数控机床的可靠性。
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关键词: 早期故障, 浴盆曲线, 数控机床, 可靠性分析, 可靠性试验