Transactions of Materials and Heat Treatment

Title：Research on reliability for piston seal of bending machine based on Markov chain

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

Unit： Chongqing University Chongqing Technology and Business Institute

KeyWords： Markov chain reliability seal ring bending machine contaminated particle

ClassificationCode：TH137

year,vol(issue):pagenumber：2013,38(5):99-103

Abstract：

To research the service life and reliability of the piston seal for a certain type of bending machine, a three-state Markov chain model of a single contaminated particle in hydraulic fluid was established by Markov process. Then an approximate formula between the impact rate of the piston seal impacted by the single contaminated particle, life distribution and MTTF and the concentration of contaminated particle and the seal gap was derived on the basis of investigation. Further analyses on the formula show that to improve the service life of seal ring cost-effectively, both of the concentration of contaminated particle and the sealing clearance must be controlled in a low level. While, the basic reason which exists in bending machines manufacturing process that affects the seals service life was analyzed and identified.

Funds：

国家自然科学基金资助项目（50835008,51175527）；国家科技重大专项:高档数控机床与基础制造装备（2010ZX04014-015,2011ZX04003-031,2012ZX04011-031）；重庆市自然科学基金项目（KJ121602）

张根保（1953-），男，博士，教授

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