拉弯机液压系统故障诊断研究

【作者】 刘锋利；

【导师】 王仲奇；

【作者基本信息】 西北工业大学 ， 航空宇航制造工程， 2004， 硕士

【摘要】 拉弯机是生产加工飞机上的框肋缘条等型材零件的必须设备，常用于制造尺寸大、外形准确度要求较高、相对弯曲半径大的挤压和板弯型材弯曲件。随着拉弯机数字化程度的日益提高，拉弯机自身的故障诊断技术已成为其关键技术之一。液压系统作为拉弯机的核心，研究其故障诊断技术，对于保证加工零件的质量、提高拉弯机的工作可靠性和安全性更是意义重大。 本文深入研究了转台式拉弯机液压系统的故障诊断技术，建立了转台式拉弯机液压系统故障诊断的层次模型，提出了相应的故障诊断的策略。在详细分析了转台式拉弯机液压系统的组成结构、工艺特点和故障形式及特点的基础上，确立了液压系统状态监测的内容，组建了系统测试的硬件平台。通过对系统状态信号的测试、特征分析和提取技术研究，为最终实现状态监测、故障诊断及预报奠定了基础。利用UML技术建立了系统的软件模型，采用智能故障诊断的专家系统技术与方法，用VC++工具进行了系统开发并通过实验方法对系统的可靠性进行了分析。更多还原

【Abstract】 Stretch-bending former is used to manufacture curved pieces with large size and high shaped precision. Generally, these pieces are relatively large winding radius extrusion or sheet bending profiled bars. Especially, stretch-bending former is the needed equipment to produce rims, ribs, edges and strips of airplanes. With its digital degree advanced increasingly, self-fault diagnosis technique has been one of key techniques to stretch-bending former system. Hydraulic system is the kernel to stretch-bending former. So it’s even most important to study of the hydraulic system fault diagnosis technology. Only can these improve the reliability and security of stretch-bending former as well as quality of machining parts.This thesis investigates stretch-bending former hydraulic system fault diagnosis in detail, analyzing the former constitutes and process characteristics, researching fault patterns and features of the former. And strategies for rotary stretch-bending former hydraulic system fault diagnosis are brought forward. And a leveled systemic fault diagnosis model is established lastly. By laboring stretch-bending former system function demands, its condition monitoring contents and hardware testing platform are established. Also, fault signals acquisition, examination and process methods are researched as well. All of these settle a good groundwork for monitoring, predicting and diagnosing faults. Stretch-bending former intelligent hydraulic fault diagnosis system is developed in virtue of expert system theory and method. With software model established by UML (The Unified Modeling Language) technique and using Visual C++ 6.0 tool, the monitoring and fault diagnosis system is developed and fulfilled. In the end, the system reliability is validated by test.更多还原