Eliminating springback error in U-shaped part forming by variable blankholder force

Gang Liu*, Zhongqin Lin, Youxia Bao, J. Cao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Springback is the main concern in U-shaped part forming, which would adversely affect desired part geometries. The use of variable blankholder force in the forming process is one effective method to reduce springback. However, there has not been a systematic way to determine the blankholder force trajectory. In this article, a methodology of obtaining this blankholder force trajectory in forming a U-shaped part that considers the wrinkling limit and fracture limit in the forming process was proposed. The method was validated numerically by using the Finite Element Method to simulate the benchmark of a 2-D draw bending problem in NUMISHEET'93. With the calculated blankholder force trajectory, higher forming quality was obtained and compared with constant blankholder force cases. Springback was kept at a minimum while avoiding cracking.

Original languageEnglish (US)
Pages (from-to)64-70
Number of pages7
JournalJournal of Materials Engineering and Performance
Issue number1
StatePublished - Feb 2002


  • Sheet metal forming
  • Springback
  • U-shaped part
  • Variable blankholder force

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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