Numerical simulation and analysis of the tools radius and different blank holder forces influences on springback

2017 ◽  
Author(s):  
Paulo Sergio Olivio Filho ◽  
ADRIANO OLIVEIRA ◽  
Émillyn Ferreira Trevisani Olivio
Keyword(s):  
Numerical Simulation ◽  
Blank Holder

Numerical Simulation Research on Springback Controlling Methods of Aluminum Alloy Panel during Hydroforming

2016 ◽  
Vol 851 ◽  
pp. 163-167
Author(s):  
Dong Yan Lin ◽  
Yi Li
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Process Parameters ◽  
Orthogonal Experiment ◽  
Blank Holder Force ◽  
Scoring Method ◽  
Simulation Research ◽  
Blank Holder ◽  
Hydroforming Process

The hydroforming process of the aluminum alloy panel was simulated by the software DYNAFORM. The effects of process parameters (blank holder force, depth of panel and height of draw bead) on springback of the aluminum alloy were investigated. The max springback of the panel was analyzed by weighted scoring method. Then the process parameters were synthetically optimized for the max positive and negative springback. The results showed that the height of draw bead affects obviously the comprehensive springback of the panel. The optimization of the process parameters obtained by the orthogonal experiment can effectively reduce the max springback of the panel.

Numerical Simulation of Deep-Drawing Processes of Square Cup under Bilateral Constrained Conditions

2011 ◽  
Vol 189-193 ◽  
pp. 2892-2896 ◽  
Author(s):  
Xiao Ting Xiao ◽  
Li Cheng Huang ◽  
Yi Juan Liao ◽  
Li Guang Tan ◽  
Qiao Yu Chen
Keyword(s):  
Numerical Simulation ◽  
Friction Coefficient ◽  
Deep Drawing ◽  
Material Flow ◽  
Flow Rule ◽  
Blank Holder Force ◽  
Analysis Software ◽  
Blank Holder ◽  
Advanced Analysis ◽  
Constrained Conditions

In this paper, the flow rule of metal during the deep drawing of the non-symmetry workpieces was investigated by means of the numerical simulation of deep-drawing processes of square cup under bilateral constrained conditions. The numerical simulation was carried out by advanced analysis software Dynaform5.5. SUS304 stainless steel was used as the deforming materials. The influence of different friction coefficient and blank holder force on the drawing forming quality was analyzed. The results showed that the material flow in different areas has different trends with increase of friction coefficient and blank holder force.

Finite Element Analysis of Double Curvature and Large-Area Workpiece in Hot Gas Bulge-Forming of Polycarbonate (PC) Sheet

2009 ◽  
Vol 16-19 ◽  
pp. 500-504
Author(s):  
Zhen Xiu Hou ◽  
Nan Zhang ◽  
En Ren Liu ◽  
Zhi Liu ◽  
An Feng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Geometrical Shape ◽  
Longitudinal Stress ◽  
Large Area ◽  
Element Analysis ◽  
Blank Holder ◽  
Finite Element Software ◽  
Hot Gas ◽  
Double Curvature

To explore geometrical shape, stress distribution, strain distribution and wall thickness of product in the process of polycarbonate hot gas bulge forming, numerical simulation of 4mm PC double curvature and large-area workpiece with the chord 1050mm has been conducted by the finite element software DYNAFORM. The results indicate that the deformation of large-area workpiece starts from blank holder to sheet center, and the maximum latitudinal stress and longitudinal stress is located in the center of PC sheet. The maximum reducing rate is approximate to 6.4%. The experimental results fit well with the numerical simulation.

Consideration of Elastic Tool Deformation in Numerical Simulation of Hydroforming with Granular Material Used as a Medium

2011 ◽  
Vol 473 ◽  
pp. 707-714 ◽  
Author(s):  
Martin Grüner ◽  
Marion Merklein
Keyword(s):  
Numerical Simulation ◽  
Granular Material ◽  
Elevated Temperatures ◽  
High Strength Steels ◽  
High Strength ◽  
Appropriate Technology ◽  
The Body ◽  
Warm Forming ◽  
Forming Process ◽  
Blank Holder

The use of high and ultra high strength steels in modern bodies in white raises steadily since the 1980’s. This trend is caused by the consumers’ wish of low fuel consuming cars with an increased passenger’s safety. The processing of these steels brings new challenges e.g. high flow stresses and a low formability at room temperature or high tool loads. These challenges can be resolved by warm forming at temperatures up to 600 °C reducing the flow stresses and increasing formability. For the production of complex parts that can not be produced by deep drawing hydroforming is an appropriate technology which can also help to reduce the number of parts and thus the weight of the body in white. Nowadays typical fluids used for hydroforming are only temperature stable up to about 330 °C so that it is not possible to combine the benefits of warm forming and hydroforming. Media like gases and fluids tend to leakage during the process which can only be avoided by a sealing or high blank holder forces. A new approach is the use of ceramic beads as medium for hydroforming at elevated temperatures. Building up a heatable tool for hydroforming with granular material used as medium makes it necessary to consider thermal conductivity so that there is a need of thick insulation plates. These insulation plates show high elastic deformations affecting the blank holder forces during the forming process. Measurements of the compressibility of these plates and implementation in numerical simulation allow a significant increase of the prediction accuracy of the model. A comparison of real part geometry and numerical results from models with and without consideration of elastic deformation will be given.

Research on Stamping of Aluminum Alloy Hemispherical Components Based on Numerical Simulation and Experiments

2010 ◽  
Vol 97-101 ◽  
pp. 236-239
Author(s):  
Cheng Jun Han ◽  
Xin Bo Lin ◽  
Yan Bo Li
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Product Quality ◽  
Experimental Research ◽  
Simulation Software ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Wrought Aluminum

Experimental research on stamping of wrought aluminum alloy has been an important issue at home and abroad. In this paper, taking stamping of aluminum alloy hemispherical components for example, the effects of blank holder force (BHF) on stamping forming process of aluminum alloy are explored by methods of experiments and numerical simulation. Through experiments, the forming laws of hemispherical components are found out. The research shows that the BHF has significant effects on the quality of stamping components and reasonable BHF can greatly improve the formability of hemispherical components. Additionally, by applying simulation software in stamping, the development circle of product and its moulds can be shortened, and product quality and its competitiveness in the market can be improved.

Numerical Simulation of Stamping Forming for an Automobile Reinforced Plate Based on Orthogonal Test

2012 ◽  
Vol 602-604 ◽  
pp. 1899-1902
Author(s):  
Ming Wei Wang ◽  
Long Chen ◽  
Xiu Jun Zhao ◽  
Shu Li
Keyword(s):  
Numerical Simulation ◽  
Friction Coefficient ◽  
Analysis Of Variance ◽  
Process Parameters ◽  
Orthogonal Test ◽  
Blank Holder Force ◽  
Optimal Process ◽  
Blank Holder ◽  
Reinforced Plate ◽  
Result Analysis

The effects of stamping process parameters (blank thickness, blank holder force, friction coefficient, die clearance) on the formability of an automobile reinforced plate were investigated. The process parameters are optimized based on the results of orthogonal testing. The optimal process parameters were obtained by simulation result analysis of variance. The accuracy of numerical simulation is verified by the experiment, which provides guidance for the actual production.

scholarly journals Large Ellipsoid Parts Manufacture Using Electromagnetic Incremental Forming With Variable Blankholder Structure

2021 ◽  
Author(s):  
Xiaohui Cui ◽  
Yan Ziqin ◽  
Chen Baoguo ◽  
Du Zhihao ◽  
Xiao Ang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Compressive Stress ◽  
Sheet Metal ◽  
Incremental Forming ◽  
Sheet Material ◽  
Electromagnetic Forming ◽  
Blank Holder ◽  
Load Bearing ◽  
Metal Thickness

Abstract The large ellipsoid parts are the main load-bearing components in the rocket tank, which are prone to wrinkle when using the traditional stamping. In order to solve the wrinkling problem in large parts, the EMIF method with a variable blank holder is proposed in this paper. The numerical simulation has shown that the sheet material near the blank holder is, as a consequence of stamping, subjected to circumferential compressive stress. When the drawing height was 100 mm, the sheet metal was notably wrinkled. In the electromagnetic forming (EMF) process, the sheet region facing the coil becomes thinner. However, the sheet metal thickness corresponding to the coil edge increases with the increase in forming height. If the EMF forming height is 150 mm, the sheet, which is in contact with the smooth mold, is deformed without a wrinkle. Compared to the traditional stamping, the EMF can significantly reduce the sheet metal wrinkling, improving the deformation height of the sheet metal smooth area.

Numerical Simulation and Verification of Multi-Operation Sheet Forming Process for Stamping Parts of Spiral Step Surface

2011 ◽  
Vol 189-193 ◽  
pp. 2911-2916
Author(s):  
Ling Sun ◽  
Jian Wei Xing ◽  
Wu Hua Cheng
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Low Cost ◽  
Sheet Thickness ◽  
Forming Limit ◽  
Drawing Process ◽  
Forming Process ◽  
Actual Measurement ◽  
Blank Holder ◽  
Product Thickness

On the basis of in-depth simulation analysis of stress and strain, thickness and forming limit changes in the property sphere during the drawing process for the stamping part of the spiral step surface, combined with the comprehensive simulation analysis of flanging, punching and other operations for the parts, it is concluded that the most obvious non-uniform changes of sheet thickness occur in the drawing process and then in the flanging process. The possibility and the distribution of tension fracture in ironing and wrinkles in thickening has been predicted and the production feasibility of low-cost drawing process without the blank holder and multi-operation forming process for stamping parts of spiral step surface. The validity of multi-operation numerical simulation results has been verified by the actual measurement of finished product rate and product thickness in trial production.

Numerical Simulation of Rubber Bladder Hydroforming Process for Shrink Flanging Parts with Large Curvature

2012 ◽  
Vol 430-432 ◽  
pp. 1286-1289
Author(s):  
Ming He Chen ◽  
Fu Dong Wang ◽  
Jie Xiong
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Simulation Analysis ◽  
Hydraulic Press ◽  
Blank Holder ◽  
Finite Element Software ◽  
Hydroforming Process ◽  
Rubber Forming ◽  
Main Defect ◽  
Dip Angle

The main defect of shrink flanging wing rib is wrinkling in rubber bladder hydroforming. In the aeronautical field, the side blank holder is usually used to avoid wrinkling. In order to obtain appropriate parameters of side blank holder, it be carried out that the simulation analysis for the process of the high hydraulic press rubber forming processes of high shrink flanging with side blank holder by the ABAQUS finite element software. Besides, the corresponding experiments verified also be implemented. The research results show that the sheet metal tends to wrinkle along with decrease of the blank lap width and increase of these parameters such as the distance between side blank holder and die, the dip angle and fillet radius of the side blank holder.

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