BHF-window-based research of BHF technology applicability at elevated temperature

  • Wei Chen
  • Long Chen
  • Ahar Benjamin Ter
  • Yinxia Zhu
  • Luyou Yue
ORIGINAL ARTICLE
  • 35 Downloads

Abstract

Thermal forming processes and blank-holder force (BHF) technology can both effectively improve the formability of high strength steel (HSS). However, whether the BHF technology is applicable at elevated temperature has yet to be researched. So, in this paper, to evaluate its applicability, BHF window was selected and its size was observed. The cylindrical cup was selected as the research object and its theoretical BHF windows at temperatures from room temperature (RT) to 400 °C, based on plastic theory, were constructed and verified by experiments. Then, main factors contributing to the change of BHF window as temperature rose were analyzed and effective methods for expanding BHF window size were studied. The experimental date, according well with the theoretical BHF windows with the exception of that at temperature of 300~350 °C because of the “blue brittle,” prove the validity of theoretical BHF window. The size of BHF window kept shrinking as temperature rose, which means that it will be more difficult to implement BHF technology at higher temperatures. Initial diameter of blank, coefficient of friction (COF) between blank and die surface and material property are the main factors that affect the size of BHF window at RT or elevated temperatures. Therefore, certain temperatures possibly resulting in brittle fracture of blank should be avoided. Then, reasonable blank sizes and reducing COF could provide a reasonable size of BHF window and make implementing BHF technology in thermal sheet-forming feasible.

Keywords

Thermal sheet forming BHF technology BHF window Cylindrical cup 

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Copyright information

© Springer-Verlag London Ltd. 2017

Authors and Affiliations

  • Wei Chen
    • 1
  • Long Chen
    • 1
  • Ahar Benjamin Ter
    • 1
  • Yinxia Zhu
    • 1
  • Luyou Yue
    • 1
  1. 1.School of Mechanical EngineeringJiangsu UniversityZhenjiangPeople’s Republic of China

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