Transactions of Materials and Heat Treatment

Title：Reliability assessment of CNC bending machine based on mixture Weibull distribution

Authors： ZHANG Gen-bao YANG Yi LIU Jie GAO Qi-liang

Unit： Chongqing University

KeyWords： reliability assessment CNC bending machine mixture Weibull distribution EM algorithm

ClassificationCode：TH17；TG305

year,vol(issue):pagenumber：2013,38(6):76-79

Abstract：

A two-parameter mixture Weibull distribution model was established on the basis of failure data gathered from CNC bending machine of WEHK 110/3100,the model was defined by goodness-of-fit test, and the parameter estimate was solved by EM algorithm. Based on the data, the machine breakdowns following Weibull distribution was proved. In the end, reliability index of the CNC bending machine was achieved. The results show that the index is in conformity with actual operations of enterprise, and it is capable to be used as a reference for bending machine reliability, hence maybe it is a new approach to reliability assessment of CNC bending machine.

Funds：

国家自然科学基金资助项目（51175527;50835008）；国家科技重大专项资助项目“高档数控机床与基础制造装备”资助项目（2010ZX04014-015；2011ZX04003-031；2012ZX04011-031）

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