The defect on the surface of pickle sheet is introduced, its forming cause and influence on the following deep working analyzed, some quality control measures proposed.
The addendum surfaces are very important for the product quality in sheetforming process, but their design is very time-consuming and requires tedious trial-error corrections.
Finite element analysis (FEA) plays more and more important role in sheet-metal forming. However, if the analysis is performed on a low quality mesh, the FEA can be inaccurate.