数控线切割智能状态监测系统研究
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摘要
数控机床是数控技术在工业生产中的典型应用,数控机床的“智能化”是数控技术的发展方向。数控机床状态监测与故障诊断技术是数控机床“智能化”的重要内容。该方向的研究不仅具有一定的理论研究意义,而且具有明确的应用背景。
     本文在综合国内、外状态监测与故障诊断技术的基础上,以数控线切割机床为对象,对数控机床的运行特性进行了研究,设计出了数控线切割机床智能状态监测系统。本系统以计算机为主体,通过各种传感器实时采集数控线切割机床运行过程中的特征参数,并对特征参数进行实时分析与处理,利用人工神经网络对数控线切割机床电极丝的工作状态进行了辩识,提出了运行状态综合劣化度的概念,对数控线切割机床运行状态进行了有效的评价。
     本系统集数据采集、信号处理、状态监测于一体,是数控线切割机床状态监测与故障诊断系统的重要组成部分。在SCX-Ⅱ型数控线切割机床上进行了电极丝工作状态识别及数控线切割机床运行状态综合劣化度的评价分析实验,实验结果表明,该系统能实时地采集数控线切割机床运行过程中的特征信号,能正确地识别出电极丝的工作状态,根据采集的特征信号能客观地评价数控线切割机床的运行状态,从而验证了所设计的数控线切割机床智能状态监控系统运行的有效性和可行性。
Numeral control machine tool is the representative application of numeral control technology in industrial manufacturing; the intelligence of the numeral control machine tool is the evolutional orientation of numeral control technology. Numeral control machine tool condition monitoring and fault diagnosis system is the important part of the intelligence of numeral control machine, so this paper has not only the theoretic significance but also explicit applying background.
    A lot of natural and international condition monitoring and fault diagnosis technology are studied, the running rule of the numeral control machine tool is studied based on wire electric discharge machine (WEDM), a intelligent condition monitoring system for WEDM is designed. In this system, computer is the principal part, representative parameters of the running WEDM were acquired at real-time by sensors, they were filtered and analyzed at real-time, the working state of the WEDM electrode wire was also recognized by artificial neural networks (ANN), the concept of running compositive condition severity factor was bring forward in this paper, the running state of the WEDM was evaluated effectively.
    Data acquisition, signal processing, condition monitoring are concentrated in this system, it is the main part of the condition monitoring and fault diagnosis system for WEDM. Experiments of WEDM electrode wire working state recognizing and WEDM running compositive condition severity factor evaluating have been carried out on SCX- II WEDM, the experimental results indicated that this system could acquire the representative parameters of the running WEDM in real-time, could recognize the working state of the electrode wire correctly, could evaluate the running state with the representative parameters objectively, it is also proved the validity and feasibility of the intelligent condition monitoring system.
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