| Inspection is an important process in the quality control of products. Thedevelopment of inspection technology plays a very important role in the manufactureindustry. Surfaces are widely used in aeronautic, astronomy, marine, automobile andmould fields, therefore the demands for their high efficiency and high accuracyinspection are more and more. It is of significance to do some researches on precisioninspection and error evaluation.To solve the problems of inspection of complex surfaces, some importanttechnologies, such as planning the measured points, surface matching, and form errorevaluation, are illustrated in this thesis.(1) A method of mesh intersection with triangular facets is adopted in this thesisto obtain surface machining quality using fewer measured points. The distribution ofthe measured points can vary with the curvatures of the surfaces.(2) A high accuracy matching technology is studied. The two-step method, i.e.rough matching and accurate matching, is presented to obtain high accuracy matching.The differential evolution algorithm is used for the rough matching while the simplexalgorithm and the univariate search technique are used for accurate matching based onthe least square criterion and the least condition principle.(3) The definition of form error and the mathematic model of error evaluationfor surfaces are given according to the national standards. Then the calculationprocesses of form error are discussed. The definitions of roundness error andsphericity error, and their evaluation methods are given in detail. Then the differentialevolution algorithm is introduced into the error evaluation for surfaces. |
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