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http://dx.doi.org/10.7736/KSPE.2015.32.11.945

Improvement of Formability in Automobile Panels by Variable Blank Holding Force with Consideration of Nonlinear Deformation Path  

Jeong, Hyun Gi (Die Design Team, Sungwoo Hightech)
Jang, Eun Hyuk (Deptartment of Product Design and Manufacturing Engineering, Graduate School, Seoul National University of Science and Technology)
Song, Youn Jun (Press Stamping Tool Design Team, Hyundai Motors Corporation Tooling Center)
Chung, Wan Jin (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korean Society for Precision Engineering / v.32, no.11, 2015 , pp. 945-952 More about this Journal
Abstract
In drawing sheet metal, the blank holding force is applied to prevent wrinkling of the product and to add a tensile stress to the material for the plastic deformation. Applying an inappropriate blank holding force can cause wrinkling or fracture. Therefore, it is important to determine the appropriate blank holding force. Recent developments of the servo cushion open up the possibility to reduce the possibility of fracture and wrinkling by controlling the blank holding force along the stroke. In this study, a method is presented to find the optimal variable blank holding force curve, which uses statistical analysis with consideration of the nonlinear deformation path. The optimal blank holding force curve was numerically and experimentally applied to door inner parts. Consequently, it was shown that the application of the variable blank holding force curve to door inner parts could effectively reduce the possibility of fracture and wrinkling.
Keywords
Automobile panel; Variable blank holding force; Formability; Servo cushion; Finite element analysis;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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