Function Decomposition and Reliability Analysis of CNC Machine Using Function-motion-action
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摘要: 以数控机床的可靠性控制为目的,提出了FMA(功能-运动-动作)功能分解方法。并将其与传统的分析方法进行了比较,突出了FMA分解方法的特点和优点。通过对机床整机功能的逐层分解找出了构成机床加工的所有元动作,并阐述了元动作与整机可靠性之间的关系。利用故障树对元动作进行分析,找出了元动作异常的根本原因,并根据分析结果制定了可靠性控制的具体措施。通过实例证明了基于FMA的功能分解是一种针对性强,且行之有效的机床可靠性分析技术。Abstract: In order to control the reliability of a CNC machine,we propose a function decomposition method that uses function,motion and action（FMA） and compare it with the traditional function decomposition methods.Through decomposing the CNC machine's functions one by one,we identify all its unit actions that make up its machining processes and then explain the relationship between the unit action and the reliability of the whole machine.With the fault tree,we analyze the unit actions so as to identify the root causes of abnormal unit actions and work out the specific measures of reliability control on the basis of the analysis results.The example has shown that our functional decomposition method that uses FMA is effective for reliability analysis.
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Key words:
- CNC machine /
- function，motion and action (FMA) /
- function decomposition /
- reliability
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