FEM-Assisted Fuzzy Adaptive Blank Holder Control Approach for Sheet Stamping Process

2000 ◽  
Author(s):  
Hiroshi Koyama ◽  
Ken-ichi Manabe ◽  
Shoichiro Yoshihara
Keyword(s):  
Fem Simulation ◽  
Blank Holder ◽  
Reduction Behavior ◽  
Control Approach ◽  
Variable Blank Holder Force ◽  
Drawing System ◽  
Sheet Stamping ◽  
Ideal Curve ◽  
Fuzzy Adaptive ◽  
The Ideal

Abstract To apply the database-oriented process control design concept to intelligent stamping processes of various shape products, the extension of the concept was required. The application of FEM simulation for production of the “ideal curve”, which plays an important role in the system, was proposed. The fuzzy adaptive controlled variable blank holder force (BHF) circular-cup deep-drawing system with the new ideal curve was developed. Through the implementation of the system for cup height improvement, the availability of the concept is confirmed. As a result, the potential application of the concept to the stamping processes of various shapes is suggested. In addition, using the experimental results, the influence of the BHF history on the thickness reduction behavior is investigated. An algorithm for cup wall thickness uniformity based on the BHF historical effects is proposed and the feasibility of the algorithm is verified.

Study on Segmented Variable Blank Holder Force Method of Rectangular Box Drawing

2010 ◽  
Vol 148-149 ◽  
pp. 75-79
Author(s):  
Xi Ning Li ◽  
Cheng Yu Jiang ◽  
Jian Ping Wang ◽  
Zhong Qi Wang
Keyword(s):  
Process Simulation ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Explicit Algorithm ◽  
Force Method ◽  
Variable Blank Holder Force ◽  
Drawing System ◽  
Single Piece ◽  
Straight Segments

The form of blank holder and the manner of blank holder force (BHF) on the complicated parts forming are very important. The blank holder of rectangle box forming was divided long straight segments, short straight segments and corners. The forming process simulation of rectangular box was conducted by FEM based on explicit algorithm, including single-piece blank holder with constant BHF, single-piece blank holder with variable BHF, segmented blank holder with constant BHF, segmented blank holder with variable BHF. The results were analyzed according to the thinnest level of the parts. The displacement in the Z direction of blank holder in the simulation was considered, and the method of determining segmented variable blank holder force (VBHF) was proposed. Finally rectangular box was obtained by rectangular box drawing system of segmented variable BHF on the basis of the simulation result.

The Optimization of Variable Blank Holder Force for Sheet Metal Stamping

2006 ◽  
Author(s):  
Wu-Rong Wang ◽  
Guan-Long Chen
Keyword(s):  
Fem Simulation ◽  
Hydraulic Press ◽  
Alloy Sheet ◽  
Optimization Strategy ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
Metal Stamping ◽  
New Strategy ◽  
Blank Holding Force

This paper focuses on the research of blank holding force (BHF) and proposes a new strategy to optimize the variable BHF and determine the drawing limit under the variable BHF. The optimization strategy is based on the analysis of BHF formability window and integrated into FEM code to obtain time or/and spatial optimal BHF that applies on binders. And then a stepped rectangular box of 60 mm drawing height with segmented binders and a cylinder cup without die bottom are adopted to validate the optimization strategy. Firstly, constant BHF FEM simulations through careful experiment design are conducted to discover the drawing limit height under maximum constant BHF. Secondly, FEM simulation combining the new BHF optimization strategy is carried and the optimal profile of variable BHF is determined for both step box and cylinder cup during the whole punch stroke. The result shows this stepped box could be formed successfully using 5754-0 aluminum alloy sheet, while the maximum drawing height under constant BHF is 45mm. And the drawing limit of cylinder box under optimal BHF could reach the drawing height of 61mm, which is greatly increased comparing with maximum of 47mm under constant BHF. Finally, the constant BHF experiment and the derived trajectory of optimal BHF of both geometries are verified on a multipoint variable BHF hydraulic press and the experiment results correspond well with those of FEM simulation. This new BHF optimization strategy not only helps to determine time and spatial optimal BHF for known geometry, but also assists to design maximum drawing height for unknown geometry, which makes it an effective method.

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.

Design of Plane Magnetic Field Image Drawing System Based on PLC Motion Control

2014 ◽  
Vol 525 ◽  
pp. 282-286
Author(s):  
Jia Xin You ◽  
Hui Min Liang ◽  
Kun Zhang ◽  
Guo Fu Zhai
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Motion Control ◽  
Fem Simulation ◽  
Servo Control ◽  
Programmable Logic ◽  
Magnetic Powder ◽  
Fem Model ◽  
Drawing System ◽  
The Magnetic Field

The image of magnetic field is traditionally obtained by spreading magnetic powder manually or by sparse arrays of magnetic needles, obtaining the images of the magnetic field in different permanent magnet shapes and do repeated tests on the permanent magnet are in need. Based on programmable logic controller (PLC) motion control, the servo control and mechanical system have been built, the control strategy is discussed and the software is programmed. 2D FEM model of a test permanent magnet bar is built. Compared with the FEM simulation results, the system has achieved the goal that spreading magnetic powder quickly and evenly in the appointed area.

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.

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