scholarly journals Optimization of Process Parameters during Hydroforming of Tank Bottom using NSGA-III Algorithm

2021 ◽  
Author(s):  
Zaifang Zhang ◽  
Feng Xu ◽  
Xiwu Sun
Keyword(s):  
Process Parameters ◽  
Quality Criteria ◽  
Pso Algorithm ◽  
Hydraulic Pressure ◽  
Blank Holder Force ◽  
Technological Parameters ◽  
Blank Holder ◽  
Optimization Of Process Parameters ◽  
Element Simulation ◽  
Thickness Variations

Abstract The hydroforming technology can realize overall forming of large storage tank’s bottom, but the quality is affected by many technological parameters. In view of wrinkling and cracking defects of integral storage tank’s bottom in hydroforming, a multi-objective optimization model is established for process parameters include pre-expansion pressure, hydraulic pressure, blank holder force and fillet radius of blank holder. Based on finite element simulation, the surrogate model between process parameters and quality criteria is established using Kriging technique. NSGA-III is used to determine optimal process parameters when storage tank’s bottom reaches targets include minimum wall thickness variations, minimum fracture trend, minimum flange wrinkle and minimum wrinkle trend. Compared with Particle swarm optimization (PSO) algorithm, NSGA-III algorithm is more suitable to solve this optimization problem. The validity of this method and accuracy of the results are verified by simulation experiments.

Optimization of Process Parameters of U-Shape Sheet Metal Based on Compensation of Geometric Springback Value

2012 ◽  
Vol 455-456 ◽  
pp. 1122-1127
Author(s):  
Xiang Wu Jia ◽  
Shu Gen Hu
Keyword(s):  
Sheet Metal ◽  
Process Parameters ◽  
New Method ◽  
Blank Holder Force ◽  
Technological Parameters ◽  
Blank Holder ◽  
Optimization Of Process Parameters

Taking example for U-shape sheet metal, the paper studies the forming and springback process with Dynaform, how much the springback influenced by several factors is studied, including die figure, stamping velocity, the stroke, the blank holder force and friction. Then a useful conclusion can be reached: Using die figure to optimize the technological parameters remarkably reduce the springback value, it provides a new method to control and solve the springback issue.

Thickness of Magnesium Alloy Square Parts in Hydraulic Deep Drawing

2013 ◽  
Vol 347-350 ◽  
pp. 1187-1191
Author(s):  
Xian Chang Mao ◽  
Lian Fa Yang ◽  
Yun Liu ◽  
Shi Yang Li
Keyword(s):  
Magnesium Alloy ◽  
Wall Thickness ◽  
Deep Drawing ◽  
Thickness Distribution ◽  
Hydraulic Pressure ◽  
Blank Holder Force ◽  
Technological Parameters ◽  
Cold Forming ◽  
Blank Holder ◽  
Technical Parameters

Forming effect of square parts is influenced greatly by technical parameters in hydraulic deep drawing, and it is significative to investigate the parameters. The technical parameters which influence the cold forming effect (wall thickness difference and minimum wall thickness) were introduced in detail by numerical simulation method, including the load method of blank holder force, drawing speed, hydraulic pressure, etc. Furthermore, the reasonable technological parameters were concluded and the wall thickness distribution of magnesium alloy square parts was discussed in this paper. The results show that the cold formability of AZ31B magnesium alloy square parts could be improved when adopt reasonable technological parameters and blank holder force load path in hydraulic deep drawing.

Paraboloid of Revolution Part Hydromechanical Deep Drawing and Finite Element Simulation of Stress Analysis

2011 ◽  
Vol 88-89 ◽  
pp. 679-683
Author(s):  
Yong Chang ◽  
Xiang Sheng Li ◽  
Rui Li Du
Keyword(s):  
Deep Drawing ◽  
Theory Of Elasticity ◽  
Hydraulic Pressure ◽  
Blank Holder Force ◽  
Forming Process ◽  
Load Curve ◽  
Blank Holder ◽  
Hydromechanical Deep Drawing ◽  
Element Simulation ◽  
Major Principal Stress

Theory of Elasticity and Plasticity was used to analyzed stress of different deformation zone of part in hydromechanical deep drawing (HDD). HDD is a kind of advanced sheet metal forming method. Satisfying the need of adornment parts and auto parts and aiming at paraboloid chimney HDD with initial inverse pressure and variable blank-holder forces was studied by means of numerical simulation. The dynamic explicit analytical software DYNAFORM was employed to simulate the forming process to obtain major principal stress of the material. The blank holder force and hydraulic pressure influence on forming were studied. The load curve of blank holder force (BHF) and hydraulic pressure were optimized.

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.

Standard Deviation Method Based PSO

2016 ◽  
Vol 7 (2) ◽  
pp. 15-35
Author(s):  
Arindam Majumder ◽  
Abhishek Majumder
Keyword(s):  
Process Parameters ◽  
Performance Index ◽  
Manufacturing Process ◽  
Pso Algorithm ◽  
Optimization Techniques ◽  
Advanced Manufacturing ◽  
Optimization Of Process Parameters ◽  
Optimal Value ◽  
Single Attribute ◽  
Deviation Method

Nowadays, optimization of process parameters in manufacturing process deals with a number of objectives. However, the optimization of such process becomes more complex if selected attributes are conflicting in nature. Therefore, to overcome this problem in this study a SDM based PSO algorithm is proposed for optimizing the manufacturing process having multi attribute. In this proposed approach the SDM is used to convert multi attributes into single attribute, named as multi performance index, while the optimal value of this multi performance index is predicted by PSO. Finally, three instances related to optimization of advanced manufacturing process parameters are solved by the proposed approach and are compared with the results of the other established optimization techniques such as Desirability based RSM, SDM-GA and SDM-CACO. From the comparison it has been revealed that the proposed approach performs better as compare to the existing approaches.

Influence of the Key Process Parameters in Hydrodynamic Deep Drawing Utilizing a Combined Floating and Static Die Cavity

2021 ◽  
Author(s):  
Huiting Wang ◽  
Jianfei Kong ◽  
Hongbo Pan ◽  
Jinxiu Fang ◽  
Xiaohui Shen
Keyword(s):  
Process Parameters ◽  
Deep Drawing ◽  
Initial Pressure ◽  
Loading Path ◽  
Maximum Pressure ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Hydraulic Loading ◽  
Second Stage ◽  
Hydrodynamic Deep Drawing

Abstract This study focus on the effects of the key process parameters during a modified hydrodynamic deep drawing utilizing a combined floating and static die cavity (HDDC). A two-stage hydraulic loading path is recommended in the novel process, and each stage of the hydraulic loading path is a linear loading path with an inflection point. The method to evaluate the wrinkle and forming dimension precision of the formed parts is introduced at first. Then the influence of the key parameters of the two-stage hydraulic loading path as well as the blank holder force on the dimension accuracy and surface quality of the formed parts was studied in detail. The results showed that the influence of the liquid pressure during the second stage is more significant than that in the first stage in hydrodynamic deep drawing utilizing a combined floating and static die cavity. The initial pressure of the second stage and the maximum pressure arriving moment during this stage have a significant impact on the dimensional accuracy of the formed parts, and the smaller initial pressure or the later the maximum pressure of the second stage arrives, the higher the accuracy of the formed part is. Similarly, the influence of the blank holder force in the second stage on the forming accuracy is more significant than that in the first stage.

Application of FEM Simulation and Abductive Network to Predict the Springback of U-Shaped Bending Process with Counter Force

2012 ◽  
Vol 579 ◽  
pp. 32-41
Author(s):  
Tung Sheng Yang ◽  
Jen Chuan Yeh ◽  
Sheng Yi Chang
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
Fem Simulation ◽  
Data Sets ◽  
The Finite Element Method ◽  
Blank Holder Force ◽  
Element Analysis ◽  
Blank Holder ◽  
Bending Process ◽  
Abductive Network

This study applies the finite element method (FEM) in con-junction with an abductive network to predict springback’s angle during the U-shaped bending process with counter force. To verify the prediction of FEM simulation for springback, the experimental data are compared with the results of current simulation. Bending force, effective stress distribution and springback are investigated for different process parameters, such as profile radius of die, blank holder force and counter force of U-shaped bending process, by finite element analysis. The abductive network is then utilized to synthesize the data sets obtained from numerical simulations. Finally, prediction model is established for predicting springback’s angle under a suitable range of process parameters.

Deep Drawing of Square-Shaped Sheet Metal Parts, Part 2: Experimental Study

1993 ◽  
Vol 115 (1) ◽  
pp. 110-117 ◽  
Author(s):  
S. A. Majlessi ◽  
D. Lee
Keyword(s):  
Process Parameters ◽  
Deep Drawing ◽  
Process Conditions ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Punch Load ◽  
Blank Size

The deep drawing process of square and rectangular shells were investigated under different process conditions, and using two different drawing quality steels. The main objective was to identify the significance of some of the process parameters on the outcome of the drawing operation. The process parameters examined were shape and size of blank, the blank-holder force and frictional condition between blank and tooling. The results of this investigation were presented in terms of punch load, through thickness and in-plane strain distributions, formations of flange wrinkles and fracture, and the largest possible blank size that can be drawn successfully. Some of these experimental results were used to verify the validity of a simplified analytical model which was described in the first part of this paper.

The Effect of Polyurethane Hardness on the New Die-Set of Sheet Hydroforming Process Parameters

2012 ◽  
Vol 152-154 ◽  
pp. 1623-1627
Author(s):  
Morteza Hosseinzadeh
Keyword(s):  
Process Parameters ◽  
Thickness Distribution ◽  
Effective Parameters ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Sheet Hydroforming ◽  
Die Set ◽  
Hydroforming Process

In recent years, several sheet hydroforming methods have been introduced by researchers. Despite the advantages of these methods, they have some limitations. The author [1] already proposed a novel sheet hydroforming method that is a combination of the standard and hydromechanical sheet hydroforming processes. The proposed method has the advantages of both processes and eliminates their limitations. In this method, a polyurethane diaphragm was used as a part of die-set to control the blank holder force. In this paper, the effect of polyurethane hardness on the effective parameters of the combined sheet hydroforming die-set such as forming pressure, thickness distribution of formed cup and maximum thinning zone of formed cup was investigated experimentally. It was shown that a softer polyurethane needs to a higher oil pressure to prevent wrinkling in the flange of the part. And tearing occurs at higher level of forming pressure. Also it was shown that by softer polyurethane, better thickness distribution was obtained.

Numerical Simulation of Ti-6Ai-4V Channel Part in Hot Forming Process

2011 ◽  
Vol 337 ◽  
pp. 410-413
Author(s):  
Jian Li ◽  
Jun Zhang ◽  
Xue Liang Deng
Keyword(s):  
Effective Stress ◽  
Hot Forming ◽  
Blank Holder Force ◽  
Force Curve ◽  
Technological Parameters ◽  
Forming Process ◽  
Growth Trend ◽  
Element Analysis ◽  
Blank Holder ◽  
Forming Characteristics

Abstract. Base on establishing the model of channel part deep drawing , the eat / DYNAFORM finite element analysis software is used to simulate and analysis the hot forming process of Ti-6Ai-4V channel part, the technological parameters which influenced the basic forming characteristics of the channel are researched. The result shows that: as with the punch and die clearance increases, the growth trend of the maximum effective stress value decreases, the thinning ratio has an increasing trend, the effect of clearance value on the material thickening ratio is small; as the fraction coefficient increases, the maximum effective stress increases in the whole forming stage, and along with the forming depths increase, friction can only influence the thinning ratio of material to a certain extent, the maximum thickening ratio decreases as the friction coefficient increases and decreases more quickly with the forming depths increase; the effect of different blank holder force on the maximum effective stress is not obvious in the forming process, under the role of first decrease and then increase type blank holder force curve, the maximum thinning ratio increases rapidly, exert the type of decreasing and the first increase then decrease blank holder force curve, the thickening ratio of the slab is small after forming, it can inhibit wrinkle and obtain better forming quality.

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