Li Yawei, Luo Yi, Wang Xiaodong
Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian 116024, China.
Key Laboratory for Precision and Non-Traditional Machining of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
Micromachines (Basel). 2023 Sep 27;14(10):1852. doi: 10.3390/mi14101852.
Inspection is a crucial process to ensure product quality. In the precision assembly of an optic-mechanical device, a part with micro multi-section arcs needs to be inspected and assembled into another part. Actually, because of machining errors, including dimensional and geometric shapes, can lead to complex deformation modes for parts with micro multi-section arcs, posing challenges to their inspection. Furthermore, inconsistencies in feature images in microscopic vision may complicate the extraction of the Region of Interest (ROI). To address these issues, this paper proposes an ROI extraction method based on the CAD model for rough positioning of feature points and connected region detection for refinement. Subsequently, based on feature points, the CAD model is used again to obtain the ROI. For inspection purposes, this paper proposes a method suitable for micro multi-section arcs based on assembly fit requirements. Experimental testing was performed on parts with eight-section arcs and mirrors to verify the effectiveness of the proposed method. This method provides a suitable solution for the inspection of micro multi-section arcs in precision assembly with the potential to improve the accuracy of the inspection results.
检测是确保产品质量的关键过程。在光机械设备的精密装配中，一个带有微多段弧的零件需要进行检测并装配到另一个零件中。实际上，由于包括尺寸和几何形状在内的加工误差，会导致带有微多段弧的零件出现复杂的变形模式，给它们的检测带来挑战。此外，微观视觉中特征图像的不一致可能会使感兴趣区域（ROI）的提取变得复杂。为了解决这些问题，本文提出了一种基于CAD模型的ROI提取方法，用于特征点的粗定位和连通区域检测以进行细化。随后，基于特征点，再次使用CAD模型来获取ROI。出于检测目的，本文基于装配配合要求提出了一种适用于微多段弧的方法。对具有八段弧的零件和镜子进行了实验测试，以验证所提方法的有效性。该方法为精密装配中微多段弧的检测提供了合适的解决方案，有可能提高检测结果的准确性。
