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In-process forecasting compensation control of machining center volumetric error including workpiece inspection.

机译：加工中心体积误差的在线预测补偿控制，包括工件检查。

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摘要

The quality of a manufactured part can be substantially improved without costly machine tool redesign or remanufacture by compensation. Current off-line methods of machine error compensation cannot improve the accuracy of a machine beyond a certain limit. And, this limit can only be reached if the reproducibility of a machine's movement is improved by both real-time machine error compensation and in-process workpiece inspection.; To improve workpiece accuracy without costly machine tool structural changes, the machine control system must be made to more accurately position the cutting tool relative to the workpiece within the work volume of the machining center. In this thesis a strategy is proposed for improving the accuracy of a multi-axis machining center by on-line measurement and compensation for the machine's deterministic and stochastic errors in positioning. An on-line error forecasting compensation control system is proposed to enhance the real-time positioning accuracy of the machining center.; A volumetric error model is developed which uses the axis encoder zero readings as a reference rather than using the structural elements of the machine. Based on this volumetric error model, the total volumetric error map for the multiaxis machining center is determined. From the volumetric error map the error vector can be obtained for any position of the machine axes within the entire work space of the machining center.; Recursive autoregressive (AR) models, along each of the three encoder referenced axes, are used to fit the 21 volumetric error components in real time. One-step-ahead forecasting is used for on-line compensation. From the on-line forecasting compensation control simulation results from three typical cutting paths, the error was reduced between 86-93%.; Even with both the in-process measurement of machine error and compensation for this error, volumetric error from sources that are not covered by the on-line measuring system will still remain. In order to reduce the error further, on-machine workpiece inspection was added to the overall compensation strategy. Simulation shows an additional 74% reduction in workpiece error is possible with the use of time series techniques applied to the inspection data.
机译：制造零件的质量可以得到显着提高，而无需进行昂贵的机床重新设计或通过补偿进行再制造。当前离线的机器误差补偿方法不能将机器的精度提高到超过特定极限。并且，只有通过实时机器误差补偿和在加工工件检查两者来提高机器运动的可重复性时，才能达到该极限。为了在不进行昂贵的机床结构改变的情况下提高工件精度，必须使机床控制系统更精确地将切削刀具相对于工件定位在加工中心的工作空间内。本文提出了一种通过在线测量和补偿机床确定性和随机误差来提高多轴加工中心精度的策略。提出了一种在线误差预测补偿控制系统，以提高加工中心的实时定位精度。建立了体积误差模型，该模型使用轴编码器零读数作为参考，而不是使用机器的结构元件。基于该体积误差模型，确定多轴加工中心的总体积误差图。从体积误差图中，可以得到加工中心整个工作空间内机床轴任何位置的误差矢量。沿着三个编码器参考轴中的每一个，使用递归自回归（AR）模型实时拟合21个体积误差分量。一步一步的预测用于在线补偿。根据三种典型切削路径的在线预测补偿控制仿真结果，误差降低了86-93％。即使同时进行机器误差的测量和对此误差的补偿，来自在线测量系统未涵盖的源的体积误差仍将保留。为了进一步减少误差，在整体补偿策略中增加了在机工件检测。仿真显示，通过将时间序列技术应用于检查数据，可以将工件误差进一步降低74％。

著录项

  • 作者

    Gerlitz, Frank E.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Engineering Electronics and Electrical.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1990
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;机械、仪表工业;
  • 关键词

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