铜带拉弯矫直机的可靠性分析

发布时间：2018-03-21 12:27

本文选题：拉弯矫直机　切入点：可靠性　出处：《浙江理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：拉弯矫直机是铜带材生产不可或缺的主要设备之一，经过拉弯矫直的带材，不但能获得良好的板形，还可以减少乃至消除带材内部的残余应力，改善带材的机械性能。拉弯矫直机工作的可靠性直接影响到铜带生产企业的生产安排和经济效益。本文以铜带拉弯矫直机为研究对象，针对拉弯矫直机在实际工作中出现的电机故障、传动装置卡死、收卷故障、牵引失效等故障模式，，采用模糊FMECA方法分析其故障产生的原因及影响，对具有相同风险优先数的失效类型进行重要度排序，并提出相应的改进措施。应用故障树与随机Petri网相结合，对拉弯矫直机进行稳态概率和可用度分析。论文的主要工作如下：（1）概述了论文的研究背景和意义，总结了国内外FMECA的发展现状和故障树分析的特点。介绍了适用于离散事件动态系统的随机Petri网分析方法及其应用，总结分析了拉弯矫直机的可靠性研究现状与不足之处，在此基础上提出了本文的主要研究内容。（2）分析了铜带拉弯矫直机的结构组成和工作原理，结合其九个月的运行维修记录，总结分析了拉弯矫直机的收开卷机、矫直辊组等故障及原因。（3）结合上述故障分析，对拉弯矫直机进行FMECA分析。结合模糊综合判定和故障树分析，考虑不同的影响因素对失效类型的影响权重，对拉弯矫直机中具有相同风险优先数的失效类型进行重要度排序，为其整机的故障检查顺序提供依据。（4）根据模糊FMECA分析结果以及故障树与随机Petri网之间的转换关系，对拉弯矫直机的失效模式进行随机Petri网建模，将系统失效模式转换成相应的随机Petri网；基于马尔科夫过程对随机Petri网进行瞬态概率求解，并得到该拉弯矫直机失效模式的稳态概率；利用或门对应的随机Petri网模型分析，计算不同校验周期下拉弯矫直机的可用度；综合考虑设备可用度和经济效益，确定了合理的校验周期，为拉弯矫直机的长周期运行提供了依据。（5）总结了全文的研究内容和结论，并指出了铜带拉弯矫直机需要进一步研究的内容。
[Abstract]:Tension straightening machine is one of the most important equipment in copper strip production. After stretching and straightening, not only good shape can be obtained, but also residual stress inside the strip can be reduced or even eliminated. Improving the mechanical properties of the strip. The reliability of the tension straightener has a direct impact on the production arrangements and economic benefits of the copper strip production enterprises. This paper takes the copper belt tension straightener as the research object. In view of the fault modes such as motor fault, driving device clamping, winding fault, traction failure and so on, fuzzy FMECA method is used to analyze the causes and effects of the faults in the drawing and bending straightening machine. The importance of failure types with the same risk priority is ranked, and the corresponding improvement measures are put forward. The steady-state probability and availability of tension straightener are analyzed by combining fault tree with random Petri net. The main work of this paper is as follows:. This paper summarizes the research background and significance of the thesis, summarizes the development of FMECA and the characteristics of fault tree analysis at home and abroad, and introduces the stochastic Petri net analysis method and its application for discrete event dynamic systems. The present situation and deficiency of reliability research of tension straightener are summarized and analyzed, and the main research contents of this paper are put forward. This paper analyzes the structure composition and working principle of the copper belt tension straightener, combined with its operation and maintenance record for nine months, summarizes and analyzes the faults and causes of the unwinding machine and straightening roll group of the tension straightener. Combined with the above fault analysis, the FMECA analysis of tension and bending straightener is carried out. Combined with fuzzy comprehensive decision and fault tree analysis, the influence weight of different influence factors on failure type is considered. The importance of failure types with the same risk priority in tension straightener is sorted, which provides the basis for the fault checking order of the whole machine. 4) according to the fuzzy FMECA analysis results and the transformation relationship between the fault tree and random Petri net, the failure mode of tension straightener is modeled by random Petri net, and the system failure mode is transformed into the corresponding random Petri net. Based on Markov process, the transient probability of random Petri net is solved, and the steady-state probability of the failure mode of the tension straightener is obtained, and the availability of the tension straightener under different check periods is calculated by using the stochastic Petri net model corresponding to OR gate. Considering the availability and economic benefit of the equipment, the reasonable check period is determined, which provides the basis for the long period operation of the tension and bending straightener. The research contents and conclusions of the paper are summarized, and the further research contents of copper belt tension and bending straightener are pointed out.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG333.23

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