Fitting Methods by Cubic Spline Interpolation to Curved Surface Molding in Automobiles' Covering Components

摘要

In the curved surface molding of automobiles' covering components, large amounts of data should first be sampled, and be fitted to curves with the conventional data-fitting method. Then the curves are connected to face and given corresponding molding processing, and the required effect of the curves is being smooth and accurate. The conventional data-fitting method is improved in this paper considering practical application, and the accuracy is increased with the same amount of sampling data. In practical application, this method can lessen labor intensity by decreasing measured data amount, which increases work efficiency and doesn't affect the curve fitting accuracy. So it has good engineering application value. In the industry of automobile manufacturing, the curved surface molding of automobile covering components is an important part of external design, and also an important reference standard of designing and locally maintaining dies of covering components. Curved surface molding is a branch of convertional engineering. In order to increase molding accuracy, characteristic points are often measured on regular parts of the object, and then all the points are fitted and smoothed[1]; For irregular curved surfaces, mass points should be sampled and errors be processed, then curves and curved surfaces are fitted and smoothed to create the high-quality curved surfaces, especially mass data sampling. This brings a relatively large burden to subsequent data processing and takes a lot of time for calculation. It has an important engineering application value to seek good data fitting and processing methods, reduce the amount of data sampling, and guarantee the required engineering accuracy.