Application of Surface Fitting for Springback Compensation of Automobile Sheet Metal Die Face
Date Issued
2012
Date
2012
Author(s)
Chen, Hung-Chun
Abstract
Using light metals like aluminum and magnesium alloys instead of raw materials, or reducing the thickness of automotive sheet metal can help achieve the objective of decreasing the weight of the car body. However, since the light metal prices remain high, advanced high strength steel (AHSS) is the main material for automotive sheet applications. High-strength steel, compared with traditional steel, possesses higher strength; therefore, by reducing the thickness of the material, high-strength steel can still be used to achieve the purpose of body weight loss in accordance with the collision regulations. However, a serious springback will occur during the high strength steel stamping process. By still applying the traditional method of compensation like mode trial and mode repairing will increase the time cost of mold development.
With the development of computer hardware, CAE can not only simulate the sheet metal stamping process, but also predict the springback of sheet metal and compensation. However, the output of the springback compensation analysis by CAE software is in the mesh format, so it needs to be reconstructed as the CAD surface file. This study proposes a complete set of efficient and automated method to rebuild the compensation surface by entering the following three data: the original surface, the mesh before compensation and the mesh after compensation. First, the segmentation process is applied in accordance with the original surface to make the mesh and surface correspond to each other. Then, through the parameters of the original surface, the least squares method (LSQ) and smoothing function (Energy function) are put in use to rebuild the compensation surface in sequence, and thus complete the mold surface springback compensation process. This study provides the parametric adjustment on reconstruction of surface and the method of fast automated reconstruction, which can decrease the development time of automobiles and therefore increase the development efficiency.
Subjects
triangular mesh
springback compensation
surface reconstruction
Type
thesis
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