Analysis of Numerical Simulation in the Deep Drawing of Box-Shaped Parts Using Variable Blank Holder Force

2011 ◽  
Vol 239-242 ◽  
pp. 2694-2697
Author(s):  
Kang Chen ◽  
Cheng Yun Peng ◽  
Tao Zhou ◽  
Bao Bao Li
Keyword(s):  
Numerical Simulation ◽  
Deep Drawing ◽  
Simulation Software ◽  
Straight Edge ◽  
Forming Limit ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
Shaped Part ◽  
Changes Over Time

Blank holder force of box deep drawing is studied changes with time and displacement by DYNAFORM numerical simulation software. The results shows that, when the straight edge part of the blank holder force is constant, rounded part adopts small blank holder force can significantly improve the forming limit of box deep drawing, but the wrinkle is still evident. If the straight edge and rounded part of the blank holder force changes with time, not only deep drawing limit increase, wrinkles are also significantly reduced, indicating that the forming limit of the box shaped part is more effective on the blank holder force changes over time than with the position variation.

Effect of Die Radius and BHF on Formability of the Corner of Box-Shaped Parts in Deep Drawing Processes

2012 ◽  
Vol 490-495 ◽  
pp. 2071-2075
Author(s):  
Kang Chen ◽  
Cheng Yun Peng ◽  
Bao Bao Li ◽  
Hui Liu
Keyword(s):  
Numerical Simulation ◽  
Deep Drawing ◽  
Simulation Software ◽  
Forming Limit ◽  
Blank Holder Force ◽  
Upward Trend ◽  
Blank Holder ◽  
Constant Size ◽  
Dislocation Movement ◽  
Radius Size

Formability of the corner in the deep drawing of box-shaped parts was studied. The forming of box-shaped parts was simulated through numerical simulation software DYNAFORM from the different die radius size of shoulders and corners, the different BHF of straight and curved edges and different materials, etc.. The results shows that, the forming limit height of box-shaped parts increases with the larger the die radius of shoulders and corners, and forming limit height of SS304 in the materials studied is the highest, because it has larger yield strength; If the BHF of straight and curved edges has the constant size, the forming limit height of box-shaped parts will be lower when the BHF increases, while forming limit has a clear upward trend as blank holder force increases in the deep drawing processes which accords with the change law of resistance during the dislocation movement.

Numerical Simulation of Warm Deep Drawing of AZ31 Magnesium Alloy Sheet with Variable Blank Holder Force

2007 ◽  
Vol 340-341 ◽  
pp. 639-644 ◽  
Author(s):  
Ying Hong Peng ◽  
Qun Feng Chang ◽  
Da Yong Li ◽  
Hu Jie ◽  
Xiao Qin Zeng
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Deep Drawing ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Magnesium Alloy Sheet ◽  
Variable Blank Holder Force ◽  
Az31 Magnesium Alloy Sheet

Blank holder force (BHF) plays an important role in sheet metal forming. Previous studies demonstrated that variable blank holder forces can improve the cold formability of steel blank, but the research on the application of variable blank holder force in warm forming of magnesium sheet forming has not been well investigated. In this study, the mechanical property of AZ31 magnesium alloy sheet is measured through some uniaxial tensile tests. In order to obtain the variational rule of the BHF, a mathematical model of BHF is deduced based on the energy theory. The variational rule of the BHF over the punch stroke is analyzed. Finally, three profiles of the BHF curve are designed, and the numerical simulation of warm deep drawing process of magnesium alloy sheet is also performed. A suitable variable blank holder force scheme is obtained through comparison among three results of simulation. The simulation indicates that the limiting drawing ratio of AZ31 magnesium alloy sheet can be improved from 3.0 to 3.5 with the suitable blank holder force varied by an inverted V curve.

Research on Deep Drawing with Multi-Point Variable Blank-Holder Force Controlling by Computer

2012 ◽  
Vol 472-475 ◽  
pp. 645-648
Author(s):  
Ming Ming Ding ◽  
Yong Huang ◽  
Yu Qing Shi
Keyword(s):  
Deep Drawing ◽  
Low Cost ◽  
Hydraulic Press ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
Blank Holding Force ◽  
Working Principle ◽  
Cylindrical Cup ◽  
Set Up

On the basses of analyzing the defects of variable blank holder force hydraulic press on construction and its rigid being not enough,the realization of designing method,working principle,hydraulic and system for ne controlling w type upper multi-point deep drawing with variable blank—holding force controlled by computer was introduced.In order to verify the effect of application of this set up,the testing results of deep drawing a rectangular box and a cylindrical cup formed component was presented. The results show that the equipment has low cost, general in using and optimal efficient of controlling.

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