2009•Journal of Zhejiang University of Science and TechnologyRequires access

Study on loading curve of variable blank holding force in sheet metal drawing process

YU Di-feng

Abstract

The Blank holding force(BHF) is one of the important parameters in sheet metal drawing process.Application of variable blank holding force(VBHF) can avoid such defects as wrinkling and fracture.After analyzing the theoretical principle of VBHF,we calculated the holding forces Qzi(the critical wrinkling BHF) and Qli(the critical fracture BHF) at three blank holding points for a cylinder drawing workpiece,analyzed the loading curves of the VBHF,and proved the feasibility of VBHF.The VBHF control technology is of good practical significance in the drawing process.

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Key concepts: Blank, Sheet metal, Cylinder, Fracture (geology), Mechanical engineering, Deep drawing, Structural engineering, Materials science