Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Stress-Based Springback Reduction of an AHSS Front Side Member

고강도강 프런트 사이드멤버의 응력분포 최적화를 통한 스프링백 저감

  • 송정한 (한국과학기술원 기계공학과) ;
  • 김세호 (대구대학교 자동차.산업.기계공학부) ;
  • 박성호 (포스코 자동차강재연구센터) ;
  • 허훈 (한국과학기술원 기계공학과)
  • Published : 2006.06.01
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Abstract

Optimization is carried out to determine process parameters which reduce the amount of springback and improve shape accuracy of a deep drawn product in sheet metal forming process. The study uses the amount of stress deviation along the thickness direction in the deep drawn product as an indicator of springback instead of springback simulation. The scheme incorporates with an explicit elasto-plastic finite element method for calculation of the final shape and the stress deviation The optimization method adopts the response surface method in order to seek for the optimum condition of process parameters such as the blank holding force and the draw-bead force. The present scheme is applied to design of the variable blank holding force in an U-draw bending process and the application is further extend ε d to the design of draw-bead force in a front side member formed with advanced high strength steel (AHSS) sheets of DP60. Results show that design of process parameter is well performed to decrease the stress deviation through the thickness and to reduce the amount of springback. The present analysis provides a guideline in a design stage for controlling the springback based on the finite element simulation of the complicated parts.

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