Improving the Quality in Deep Drawing of Rectangle Parts Using Variable Blank Holder Force

2010 ◽  
Vol 37-38 ◽  
pp. 521-524
Author(s):  
Yu Qing Shi
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Deep Drawing ◽  
Metal Forming ◽  
Failure Modes ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force

Wrinkling and tearing are the main failure modes in sheet-metal forming. Wrinkle may occur at the start of a punch stroke if the blank-holder force (BHF) is too low, and tearing may occur at the end of a stroke if the BHF is too high. The BHF is important for deep-drawing because of an effective way to promote deep formability sheet metal. They can be reduced or eliminated by manipulating a suitable BHF during sheet-metal forming. This paper presented an attempt to determine the effect of variable BHF on the tearing and wrinkling and investigated using 08Al sheet metal. The experiment show that tearing and wrinkling can be eliminated and the quality of deep drawing of rectangle parts can be improved using variable BHF.

scholarly journals Design optimization of variable blank holder force trajectory and slide velocity in sheet metal forming

2018 ◽  
Vol 84 (863) ◽  
pp. 18-00162-18-00162 ◽  
Author(s):  
Masaki YOKOYAMA ◽  
Satoshi KITAYAMA ◽  
Kiichiro KAWAMOTO ◽  
Takuya NODA ◽  
Takuji MIYASAKA ◽  
...  
Keyword(s):  
Design Optimization ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
Slide Velocity

Study on Blank Holder Force Control in Sheet Metal Forming Process

2012 ◽  
Vol 182-183 ◽  
pp. 1605-1608
Author(s):  
Xiao Juan Lin ◽  
Jian Hua Wang ◽  
Ke Gao Liu
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Main Function ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
The Status ◽  
Metal Forming Process

BHF is an important technical parameter in sheet metal forming, its main function is controlling material flowing，avoiding wrinkling and fracture. The status of study on the control technology of variable blank holder force (VBHF) was summarized, focusing on the method of optimized controlling and the theory of developing trend of VBHF is introduced in the paper.

Study of the Parameters of Deep Drawing Process Based on the Simulation of Dynaform

2012 ◽  
Vol 249-250 ◽  
pp. 51-58
Author(s):  
Qing Wen Qu ◽  
Tian Ke Sun ◽  
Shao Qing Wang ◽  
Hong Juan Yu ◽  
Fang Li
Keyword(s):  
Friction Coefficient ◽  
Sheet Metal ◽  
Deep Drawing ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Drawing Die ◽  
Drawing Speed

A simulation of deep drawing process on the sheet metal was done by using Dynaform, the influence of blank holder force, deep drawing speed and friction coefficient on the forming speed of sheet metal in the deep drawing process were got. The forming speed of sheet metal determines the quality of deep drawing, in the deep drawing process the blank holder force and the deep drawing speed are controllable parameters, the friction coefficient can be intervened and controlled, and it’s a manifestation of the interaction of all parameters, the main factors which influence the friction coefficient just have blank holder force, deep drawing speed and lubrication except the material. The conclusion of this study provides the basic data for the analysis of the lubrication of mould, the study of lubricant and the prediction of the service life of deep drawing die.

scholarly journals Die design optimization on sheet metal forming with considering the phenomenon of springback to improve product quality

2018 ◽  
Vol 154 ◽  
pp. 01105 ◽  
Author(s):  
Agung Setyo Darmawan ◽  
Agus Dwi Anggono ◽  
Abdul Hamid
Keyword(s):  
Product Quality ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Die Design ◽  
Forming Limit ◽  
Improve Product Quality ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Improve Product

The process of sheet metal forming is one of the very important processes in manufacture of products mainly in the automotive field. In sheet metal forming, it is added a certain size at the die to tolerate a result of the elasticity restoration of material. Therefore, when the product is removed from the die then the process elastic recovery will end within the allowable tolerance size. Extra size of the die is one method to compensate for springback. The aim of this research is to optimize the die by entering a springback value in die design to improve product quality that is associated with accuracy the final size of the product. Simulation processes using AutoForm software are conducted to determine the optimal parameters to be used in the forming process. Variations the Blank Holder Force of 77 N, 97 N, and 117 N are applied to the plate material. The Blank Holder Force application higher than 97 N cannot be conducted because the Forming Limit Diagram indicates the risk of tearing. Then the Blank Holder Force of 37 N, 57 N and 77 N are selected and applied in cup drawing process. Even though a few of wrinkling are appear, however there is no significant deviation of dimension between the product and the design of cup.

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