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一、前言连续铸钢的特点是生产率高,经济效益显著,但易出故障,从而造成漏钢或铸坯严重缺陷。因此,提高连铸设备系统的可靠性和维修性对于保证连铸坯的产量、质量和经济效益都是十分重要的。目前,国内对大型连铸设备和系统可靠性与维修性的研究甚少,所积累的数据资料也相当少。本文在全面采集国内现行连铸系统的运行、维修及测试数据的基础上,采用非线性规划数值方法对不同类型寿命数据进行极大似然估计。针对辊列系统结构的复杂性和非马氏特性,按主要失效模式建立了该系统的失效树,用数学仿真法进行有效度、重要度分析,并给出了该系统最佳预防维修周期,拉矫辊最佳更换周期及备件数的计算模型。
I. Introduction Continuous casting is characterized by high productivity, significant economic benefits, but prone to failure, resulting in serious defects in steel or cast slab. Therefore, to improve the reliability and maintainability of the continuous casting equipment system is very important to ensure the yield, quality and economic benefits of the continuous casting slab. At present, little research is done on the reliability and maintainability of large-scale continuous casting equipment and systems in China, and the accumulated data are quite few. Based on the comprehensive collection of the operation, maintenance and test data of the current continuous casting system in China, this paper uses the nonlinear programming numerical method to estimate the maximum likelihood of different types of life data. According to the complexity and non-Markov property of roller-column system structure, the failure tree of the system is established according to the main failure modes. The validity and importance of the system are analyzed by mathematical simulation. The optimal preventive maintenance cycle, The Model of Optimal Replacement Cycle and Spare Parts Calculation of Roller.