Investigation into the factors that influence inverse bulging effect during sheet hydro-mechanical deep drawing
1 School of Mechanical Engineer and Automation, Beihang University, Beijing 100191, China
2 Tianjin Tianduan Press Co., LTD, Tianjin 301700, China
The factors that influence inverse bulging effect during sheet hydro-mechanical deep drawing are especially researched in this paper. According to the different inverse bulging process, 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 ratio (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. Process parameters including the clearance between the punch and the blank holder and the blank holder entrance radius that have a large influence on inverse bulging effect are optimized, so as to make inverse bulging effect behave better in hydroforming process. Finally, the accuracy of the numerical simulation results was verified by experiments.
© Owned by the authors, published by EDP Sciences, 2015
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