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After a short review of the iterative optimal blank method, a new method of measuring the shape error for stamped parts with 3D contour lines, which is an essential component of the optimal blank design, is proposed. When the contour line of the target shape does not exist in a plane, but exists in 3D space, especially when the shape of the target contour line is very complicated as in the real automotive parts, then the measurement of the shape error is critical. In the current study, a method of shape error measurement based on the minimum distance is suggested as an evolution of the radius vector method. With the proposed method, the optimal blank shapes of real automotive parts were found and compared to the results of the radius vector method. From the current investigation the new method is found to resolve the issues with the radius vector method. Key Words : Optimal Blank, Shape Error, Minimum Distance, Radius Vector Method 1.                       .           [1]        ,          .                   [1,2].          .        2    .     [3],          [4], [5],    [6], [7]   .                     .           ,

Method of Shape Error Measurement for the Optimal Blank Design of Shapes with 3D Contour Lines