Variable Blank Holder Force Control of Tailor Welded Blanks Based on H∞ Theory

2011 ◽  
Vol 4 (11) ◽  
pp. 3508-3511
Author(s):  
Chunyan Wang ◽  
Xiaohong Xu ◽  
Wei Chen
Keyword(s):  
Force Control ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Tailor Welded Blanks ◽  
Variable Blank Holder Force

Effect of Variable Blank Holder Force on the Springback and Weld-Line Movement During Draw-Bending of Tailor Welded Blanks

2015 ◽  
Author(s):  
Bishoy M. Dawood ◽  
Mostafa Shazly ◽  
Abdalla S. Wifi ◽  
Alaa El-Mokadem
Keyword(s):  
Finite Element ◽  
Weld Line ◽  
Bench Mark ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Tailor Welded Blanks ◽  
Variable Blank Holder Force ◽  
Draw Bending ◽  
Weld Line Movement ◽  
Line Movement

Tailor welded blanks (TWBs) manufactured by drawing processes suffer from two major defects; weld-line movement (WLM) and springback. These defects can be reduced by using a counterpunch or controlling the value of the blank holder force and its scheme. This work presents a finite element analysis of the effect of variable blank holder force (VBHF) on springback and WLM of bench mark problem of draw-bending process of a TWB. The proposed VBHF scheme is developed based on the reaction forces predicted in a finite element model for artificially clamped weld-line case. The results obtained by applying VBHF are compared with those obtained using a counterpunch. The use of counterpunch is found to eliminate Vertical WLM in all the considered cases. Whereas side WLM using VBHF is found to be less than that obtained using counterpunch. When compared to the counterpunch technique, the springback values are found to be improved by applying the VBHF schemes.

The Analysis on the Stamping Formability of High Strength Steel

2021 ◽  
Vol 885 ◽  
pp. 3-9
Author(s):  
Wen Yu Ma ◽  
Jian Wei Yang ◽  
Ye Yao ◽  
Yong Qiang Zhang ◽  
Jun Zhang
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
Automotive Part ◽  
Blank Shape ◽  
Shaped Blank

Recently the high strength steel has been applied in the automotive more and more widely. In this study, the effect of blank shape on the formability of an automotive part was analyzed. The three kinds of blank shapes were chosen, including a rectangular shaped blank, a blank with two corners cut straightly and a blank with two corners cut in curve. The effect of the variable blank holder force on the formability was studied. The four kinds of variable blank holder force were applied. The blank shape in this part is the blank with two corners cut curve. The results show that the blank with two corners curve is the most suitable. And the blank holder force from 1000 kN to 1500 kN is the most useful for the formability.

The U-Bending Forming of Aluminum Foam Sandwich Panels

2013 ◽  
Vol 477-478 ◽  
pp. 1432-1439
Author(s):  
Sheng Gui Chen ◽  
Hai Bin Chen ◽  
Zhen Zhong Sun ◽  
Rong Yong Li ◽  
Wei Feng He ◽  
...  
Keyword(s):  
Aluminum Foam ◽  
Deformation Mode ◽  
Bending Test ◽  
Foam Core ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
Forming Technology ◽  
Bending Process ◽  
Deformation Defects

The U-bending process of aluminum foam sandwich (AFS) is investigated, and a punch bending test is carried out in this paper. We discussed the bending deformation mode and generated the load & stroke curve of AFS panel by experiments. Macroscopic and microscopic punch forming mechanisms of AFS panels are analyzed by testing experiments and plasticity theory. We study the major deformation defects of AFS forming such as the delamination between the panel and the foam core, the excessive thinning of panels in the round corner, and shear stress cracks of the foam core. A conclusion is drawn on the panels variable blank holder force (VBHF) and the striking block control on the round corner, which would promote the forming technology of AFS.

Sign in / Sign up

Export Citation Format

Share Document