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为了解决指针式仪表在主轴径向跳动测量中无法提供标准电流信号的困难,提出在传统的机械测量机构嵌入一个滑动可变的精密电阻,通过电桥回路将电阻变化量转换成电压信号,利用运算放大器对其电阻值进行线性化处理,从而形成符合国际标准的接口信号,由此建立一个由基础测量、数据处理和实时监控组成的三层网络系统。该网络的功能旨在实现远程数据采集、信号传输、数值计算、图像处理等。将新设计的仪表与标准光栅进行数据比对实验显示,采用特殊修刻工艺制作的可变电阻输出值与线性机械位移量之间可以呈现严格的对应关系,从而为该仪器的实验室研究走向与再制造有关的实际应用奠定基础。研究结果表明:与传统方法相比,新方法更加注重采集大量的数据,形成合适的样本集合并建立对应的数学模型。通过构造的曲线与观测点的拟合情况来进一步优化模型,并对今后的变化趋势进行预测,这样可以检测出隐匿很深的内部缺陷,从而为指导维修工作提供有价值的参考信息。
In order to solve the difficulty that the pointer instrument can not provide the standard current signal in the spindle radial runout measurement, it is proposed to insert a sliding precision variable resistance into a traditional mechanical measuring mechanism, convert the resistance change amount into a voltage signal through a bridge loop, The operational amplifier linearizes its resistance to form an interface signal that complies with international standards, thereby creating a three-layer network system consisting of basic measurement, data processing and real-time monitoring. The function of this network is to realize remote data acquisition, signal transmission, numerical calculation, image processing and so on. The new design of the instrument and the standard grating data comparison experiments show that the use of special repair technology produced variable resistance output value and the linear mechanical displacement can show a strict correspondence between the laboratory for the instrument to the research direction Lay the foundation for practical applications related to remanufacturing. The results show that compared with the traditional method, the new method pays more attention to collecting a large amount of data to form a suitable sample set and establish the corresponding mathematical model. By further optimizing the model by fitting the curves of the constructed points with the observation points, the prediction of future trends can detect hidden internal defects and provide valuable reference information for guiding the maintenance work.