光学学报, 2018, 38 (9): 0912001, 网络出版: 2019-05-09   

基于数字全息的密封平面表面形貌测量及其模型重建 下载: 773次

Measurement and Model Reconstruction of Topography of Sealing Plane Based on Digital Holography
作者单位
同济大学机械与能源工程学院, 上海 201804
摘要
表面形貌测量是研究密封平面加工工艺、加工质量及密封性的前提条件。为基于数字全息测量技术实现密封平面表面形貌的在线测量,并针对工业现场对测量结果的可视化显示及三维模型输出等特殊的技术需求,将数字全息测量技术与虚拟制造技术相结合,提出了一种密封平面表面形貌的测量方法。首先基于数字全息技术测量密封平面的表面形貌,并将测量结果转化为点云;再基于点云生成三维模型;最后利用平面度协同模型间距离分布的方法来评价测量及模型重建精度。所提方法亦可间接测量装配后密封平面上表面形貌间的配合关系。为验证上述方法的可行性,分别以某法兰面和某发动机缸体缸盖结合面为例进行实验。结果表明:所提方法能够实现密封平面表面形貌的快速测量,并可将测量结果以三维模型的形式输出,可以满足工业现场对密封平面表面形貌测量的要求。
Abstract
The measurement of surface topography is a prerequisite for studying the processing technology, processing quality and sealing performance of the sealing plane. In order to apply the digital holographic measurement technology to the on-line measurement of the sealing plane surface topography and to meet the requirements of visual display and three-dimensional (3D) model output of the measurement results in the industrial field, we propose a method of measuring surface morphology of sealing plane. The method combines digital holography with virtual manufacturing technology. Firstly, the surface topography of the sealing plane is measured based on digital holographic measurement technology and the measurement results are transformed into point cloud. Then, the 3D model is generated based on the point cloud. Finally, the accuracy of the measurement and model reconstruction is evaluated by the method of coordinating flatness with distance distribution between models. In addition, the proposed method can also indirectly measure the mating relationship between the topography of the sealing plane after assembly. The effectiveness of the proposed method is validated by the examples of a flange surface and the cylinder head surface of an engine block cylinder. The results show that the proposed method can quickly measure the topography of the sealing surface and output the results as a 3D model, which meets the needs of the industrial field for surface topography measurement.

张小兵, 刘海江. 基于数字全息的密封平面表面形貌测量及其模型重建[J]. 光学学报, 2018, 38(9): 0912001. Xiaobing Zhang, Haijiang Liu. Measurement and Model Reconstruction of Topography of Sealing Plane Based on Digital Holography[J]. Acta Optica Sinica, 2018, 38(9): 0912001.

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