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The Machine Vision Measurement Module of the Modularized Flexible Precision Assembly Station for Assembly of Micro- and Meso-Sized Parts

机译:模块化柔性精密装配站的机器视觉测量模块用于组装微型和台面尺寸的部件

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摘要

The machine vision measurement module is indispensable for the Modularized Flexible Precision Assembly Station (MFPAS), which is a fully automatic assembly system being developed at Dalian University of Technology (DUT). MFPAS consists of basic and additional modules, and are expected to be flexible, expandable, and re-configurable to adapt to a variety of parts with a large size range, requiring the machine vision measurement module to be able to achieve accurate measurement of position, as well as orientation of the parts with different size scale. An automatic zooming vision system was set up for evaluation and final integration in MFPAS. Pixel equivalent, principal point and orientation deviation of images were analyzed and experimentally studied using different magnifications of the lens. A new template with circular patterns of different diameters was designed for zoom-lens calibration. The experiments show that the measurement error caused by the variation of the pixel equivalent, principal point and orientation is estimated under 10 μm without online calibration. When high accuracy is required, online calibration can be employed during assembly. The evaluation results of the vision system with or without on-line calibration were given for a better trade-off between accuracy and efficiency during assembly.
机译:机器视觉测量模块对于模块化的柔性精密装配站(MFPA)是必不可少的,这是在大连工业大学(DUT)开发的全自动组装系统。 MFPA由基本和其他模块组成,预计将灵活,可扩展,并重新配置,以适应具有大尺寸范围的各种部件,需要机器视觉测量模块能够实现准确测量位置,以及具有不同尺寸规模的部件的方向。建立了一个自动缩放视觉系统,用于MFPA中的评估和最终集成。分析和通过不同放大透镜进行图像的像素等效,图像的主要点和取向偏差。设计具有不同直径的圆形图案的新模板,用于缩放镜头校准。实验表明,由于像素等同物,主要点和方向的变化引起的测量误差在10μm的情况下估计在没有在线校准的情况下。当需要高精度时,可以在组装期间使用在线校准。在组装期间,在精度和效率之间进行了有或没有在线校准的视觉系统的评估结果。

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