吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (5): 1567-1576.doi: 10.13229/j.cnki.jdxbgxb201605027

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Factors influencing inverse bulging effect in sheet hydroforming

LANG Li-hui1,2, WANG Yao1, LI Kui1, SUN Zhi-ying1, ZHANG Quan-da1   

  1. 1.School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;
    2.Collaborative Innovation Center of Advanced Aero-Engine, Beihang University, Beijing 100191, China
  • Received:2015-05-20 Online:2016-09-20 Published:2016-09-20

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Abstract: The factors that influence the inverse bulging effect in sheet hydro-mechanical deep drawing are investigated. According to different inverse bulging processes, two modes can be singled: the Initial Inverse Bulging (IIB) and the Local Inverse Bulging (LIB). IIB includes two parameters: inverse bulging height ratio (HIb/t) and inverse bulging pressure (pIb/t). LIB is influenced by IIB and has a direct relationship with liquid chamber pressure in the forming process. The optimal inverse bulging parameters of hemispherical bottom cylindrical part and flat bottom cylindrical part are obtained by numerical simulation. The process parameters, including the clearance between the punch and blank holder, and the radius of the blank holder entrance, which strongly influence the inverse bulging effect, are optimized, so as to make the inverse bulging effect behave better in hydroforming process. The accuracy of the numerical simulation is verified by experiments.

Key words: materials synthesis and processing technology, sheet hydroforming, inverse bulging effect, clearance between the punch and the blank holder, blank holder entrance radius

CLC Number: 

  • TG394
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