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심현보 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
After a short review of iterative optimal blank method, a new method of measuring the shape error for stamped parts with 3D contour lines, is an essential component of the optimal blank design. When the contour line of the target shape does not exist in the plane, but exists in the 3D space, especially when the shape of the target contour line is very complicated as in the real automotive parts, the measurement of the shape error really matters. In the 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 shape of a real automotive part has been found in comparison with the results of the radius vector method. Through the investigation, the current method is found to resolve the problems of the radius vector method.
김승현(S. H. Kim),심현보(H. B. Shim) 한국소성·가공학회 2012 소성가공 : 한국소성가공학회지 Vol.21 No.8
As the shape of stamped part is complicated and as the trend toward light weight continues, the higher level of difficulty is required in making stamping die because of inevitably poor formability. The poor formability can be improved if the material flow during the stamping is carefully controlled. Application of drawbead became commonsense used to retard metal flow of blank into the die cavity at the region where wrinkle is expected. In the study, the concept of beadless stamping process is proposed and the method how to realize the beadless stamping process is presented. The validity of the proposed method is confirmed by the application of the real auto part.