基于危害性分析的重型数控机床主传动系统可靠性分析

发布时间：2018-05-01 10:20

本文选题：重型数控机床 + 主传动系统　；参考：《电子科技大学》2015年硕士论文

【摘要】：可靠性分析技术作为重型数控机床可靠性工作的重要组成部分,是识别机床关键项目和薄弱环节以及对系统进行可靠性评估与改进设计的关键基础技术。重型数控机床在实现复合加工的过程中,受到自身热源、加工环境、操作技术人员等因素的影响,从而导致其加工可靠性低。如何降低这些因素的影响并提高系统可靠性,已成为可靠性研究工作亟待解决的重点与难点。本论文以国家科技重大专项“高档数控机床与基础制造装备”为依托,以国产重型数控机床为研究对象,针对重型数控机床全寿命周期中早期使用阶段的工程特性,提出重型数控机床可靠性分析工作的研究框架,为重型数控机床可靠性工作的开展提供技术支撑和理论参考。本论文的主要研究工作包括一下几个方面:(1)提出了开展重型数控机床主传动系统可靠性工作的建议方法,以帮助与协调生产厂家与使用厂家的各部门之间顺利的开展可靠性工作,并使各企业及各部门明确各自的可靠性工作职责与任务。(2)开展重型数控机床主传动系统故障模式、影响及危害性分析(FMECA)研究,根据GJB1391-2006(《故障模式、影响及危害性指南》)的规范生成《某型号落地铣镗床主传动系统FMECA报告》,为后续可靠性工作的顺利开展奠定基础。(3)在FMECA的基础上,考虑修复故障所需的成本,开展基于模糊层次分析法的PC-FMECA研究,并建立相应的数学模型,为企业对是否修复故障或设计改进工作这一决策问题提供理论依据。(4)从质量管理的角度开展重型数控机床FMEA研究,并结合5M1E提出了MFMEA方法,由此区分了机床生产厂家和使用厂家的故障责任。应用SOP方法为机床使用厂家的生产管理指明方向,并保证了机床的使用可靠性。通过上述一系列工作的开展,规范了可靠性分析工作流程,明确了各企业的可靠性工作职责,提高了可靠性工作效率。对提高重型数控机床的可靠性水平具有积极意义,为后续重型数控机床各型号的研制与改进提供了参考。
[Abstract]:As an important part of the reliability work of heavy-duty CNC machine tools, reliability analysis technology is the key basic technology to identify key items and weak links of machine tools and to evaluate and improve the reliability of the system. In the process of realizing compound machining, heavy NC machine tools are affected by their own heat source, machining environment, operation technicians and so on, which lead to low reliability of machining. How to reduce the influence of these factors and improve the reliability of the system has become the focus and difficulty of reliability research. Based on the national scientific and technological project "High-grade CNC machine tools and basic manufacturing equipment", and taking the domestic heavy-duty CNC machine tools as the research object, this paper aims at the engineering characteristics of the early stage of the heavy NC machine tool's whole life cycle. The research framework of reliability analysis of heavy-duty CNC machine tools is put forward, which provides technical support and theoretical reference for the development of reliability work of heavy-duty CNC machine tools. The main research work of this paper includes the following several aspects: (1) put forward the suggested method to carry out the reliability work of the main transmission system of the heavy duty CNC machine tool. In order to help and coordinate the departments of manufacturer and user to carry out the reliability work smoothly, and to make each enterprise and each department clear their responsibility and task of reliability work, the failure mode of main transmission system of heavy NC machine tool can be carried out. According to the criterion of GJB1391-2006( "failure Mode, influence and harmfulness Guide"), the FMECA report of the main transmission system of a certain type of ground milling and boring machine is generated, which lays a foundation for the smooth development of the subsequent reliability work on the basis of FMECA. Considering the cost of repairing faults, the PC-FMECA research based on fuzzy analytic hierarchy process (AHP) is carried out, and the corresponding mathematical model is established. This paper provides a theoretical basis for the decision of whether to repair the fault or improve the design of the enterprise. (4) from the point of view of quality management, the research on FMEA of heavy-duty NC machine tools is carried out, and the MFMEA method is put forward in combination with 5M1E. This distinguishes the machine tool manufacturer and the use manufacturer's malfunction responsibility. The method of SOP is used to point out the direction of production management of machine tools and ensure the reliability of machine tools. Through the development of the above series of work, the work flow of reliability analysis is standardized, the responsibility of reliability work of each enterprise is clarified, and the efficiency of reliability work is improved. It is of great significance to improve the reliability level of heavy duty CNC machine tools and provide a reference for the development and improvement of various models of heavy duty NC machine tools.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG659

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