基于工业CT的零件内外曲面形位误差分析

针对具有复杂内腔结构零件的内部曲面形位误差分析困难的问题,提出了一种基于工业CT技术的零件复杂内腔的形位误差分析方法.首先,使用工业CT对零件进行扫描并重建为测量STL模型.然后将设计IGES模型离散为STL模型与测量STL模型进行配准.其次,利用设计IGES模型作为引导,判定测量STL模型中的点和IGES模型各曲面的...

Form and position error analysis of inner and outer surface ofparts based on the industrial CT

It is difficult to analyze the shape and position error of internal surface of parts with complex cavity structure. To address thisissue, a method of analyzing the shape and position error of complex cavity of parts is proposed, which is based on industrial CTtechnology. First, the parts are scanned by using industrial CT and reconstructed into the measurement STL model. Then, the designIGES model is discretized into the STL model and the measurement STL model for registration. Secondly, by using the designed IGESmodel as the guide, the points in the STL model and the belonging of each surface of the IGES model are determined. And all thesurfaces in the STL model are automatically segmented and measured. Finally, the surface of IGES model is selected and the point cloudcluster corresponding to the surface is analyzed. The valve body model of the million-dollar measurement point cloud is selected for theexperiment. All the surfaces of the point cloud model are completely segmented. The cylindricity, flatness and parallelism of the selectedinternal surface are measured to be 1. 11 mm, 0. 61 mm, and 1. 92 mm, respectively. In this method, only the input STL model of partmeasurement and the IGES model of part design are required. The measured surface of IGES model is selected. The internal and externalsurface of part can be analyzed automatically.