Abstract
The shape change of longitudinal surface micro-defects in flat rolling was investigated using a rigid-plastic finite element analysis. Rolling of plate with V-shaped scratches or rectangle defects that are parallel to the rolling direction, was simulated assuming a generalized plane strain condition. The calculated results were verified with experiments of model material, and good agreement between both results was obtained. The influence of rolling conditions, such as reduction, friction coefficient and the position of initial defect, on the shape of existing defect after rolling was evaluated. Using the developed FEM, the evolution of seam defects was also simulated, and good agreement with experimental results were obtained. The proposed prediction method can be utilized to make defect free products in flat rolling.
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