Abstract
Reverse engineering is typically applied to solve the CAD model of unknown parts. As modern industry requirements on the accuracy of complex surfaces increase, setting up the high-precision CAD modeling of unknown complex surface parts through reverse engineering becomes an interesting research topic. Here, we present a method that combines manual measurement and automatic measurement with a high-precision coordinate measuring machine (CMM) to measure unknown complex-surface to obtain CAD model. In this study, the unknown complex-surface was fixed on the CMM worktable, and cancelling the probe compensation function of PC-DMIS before measurement. Then, 490 measuring points were obtained by manually moving the probe with a diameter of 5mm to measure surface. The measured points generated the CAD model, the CAD model was offset a probe radius, and determined the rough contours of the surface. This CAD model was automatically measured in a CMM, and the function of the “automatic measurement model” was iterated to obtain a high-accuracy CAD model. Each measurement was arranged with 20×20 measuring points. The accuracy of the CAD model obtained by each iterative measurement would be improved, and finally a high-precision CAD model was obtained. After 7 iterations, the final accuracy of the unknown surface CAD model was as high as 0.004 mm as compared to that of the actual part.
Highlights
Through numerous explorations and experiments, many methods and instruments have been applied to reverse engineer model parts [1]
We present a method of modeling unknown surfaces using a coordinate measuring machine (CMM) combined with manual and automatic measurement methods
Before using the high-precision CMM to measure the unknown surface manually, we turned off the CMM probe radius compensation setting, because a manual measurement surface cannot guarantee that the measurement direction of the probe will be the normal direction of the point to be measured on the surface
Summary
Through numerous explorations and experiments, many methods and instruments have been applied to reverse engineer model parts [1]. There are two ways of measuring and modeling unknown surfaces, namely touch-trigger probe and non-contact measurement. With the improvement of the complexity and the accuracy of part measurement, there are some measurement methods that combine the two. The non-contact measurement accuracy such as that of laser scanning is insufficient, and the output of the point cloud data is huge [2], which requires special software for post-processing; this method is not suitable for unknown high- precision model reconstruction of a curved surface. From the touch-trigger probe perspective, the efficiency of modeling by manual measurement is low, and the accuracy of modeling by pure automatic measurement is low.
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