Determination of the Optimal Blank Diameter in the Case of Mini Deep Drawing by Applying the Fuzzy Logic and Taguchi Methods

2014 ◽  
Vol 1036 ◽  
pp. 304-308
Author(s):  
Gheorghe Brabie ◽  
Bogdan Chirita ◽  
Elena Costache ◽  
Stefan Teaca
Keyword(s):  
Fuzzy Logic ◽  
Taguchi Methods ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Material Consumption ◽  
Blank Holder ◽  
Simulation And Experiment ◽  
Aluminium Sheets ◽  
Blank Diameter

An important problem in obtaining mini drawn parts with high precision is represented by the blank geometry. Utilization of a blank with optimal shape and dimensions leads to the following benefits: improves the accuracy of the drawn parts and determine the costs reduction due to reduced material consumption and cost, lower number of technologic operations, shorter manufacturing times etc. An adequate blank prevents the following effects on drawn part: avoids the part fracture, conducts to a uniform distribution of the material thickness in drawn part and reduces the blank holder force required by the drawing process. The present paper analyses the results of investigations made by simulation and experiment concerning the establishment of the optimal blank diameter in the case of mini cylindrical drawn parts made from aluminium sheets. The optimal blank diameter was determined by applying the Fuzzy Logic and Taguchi methods.

Blank holder force optimisation strategy in deep drawing process

2007 ◽  
Vol 1 (2) ◽  
pp. 226 ◽  
Author(s):  
Hossam H. Gharib ◽  
Abdalla S. Wifi ◽  
Maher Y.A. Younan ◽  
Ashraf O. Nassef
Keyword(s):  
Deep Drawing ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Deep Drawing Process

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.

Effect of Blank Holder Force with Low Frequency Vibration Technique in Circular-Cup Deep-Drawing Using AZ31 Magnesium Alloy Sheet

2011 ◽  
Vol 383-390 ◽  
pp. 2785-2789
Author(s):  
Naoki Horiike ◽  
Shoichiro Yoshihara ◽  
Yoshitaka Tsuji ◽  
Yusuke Okude
Keyword(s):  
Deep Drawing ◽  
Low Frequency ◽  
Lubricating Oil ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Low Frequency Vibration ◽  
Friction Performance

In the deep-drawing process, the application of low-frequency vibration to the blank material has recently been focused on with the aim of improving the friction performance between the die and the blank material. A servo-controlled press machine is suitable for applying low-frequency vibration to the blank during the deep-drawing process, because the punch speed and blank holder force (BHF) are easily controlled as process parameters by using the servo motors. In this study, a BHF with low-frequency vibration was proposed as a technique for improving deep-drawability, which is mainly affected by the friction performance and the lubricant condition. We found that the friction performance between the blank surface and the blank holder was decreased in the case of a BHF with low-frequency vibration since the lubricating oil rapidly flowed into the clearance during the forming process. Furthermore, for a BHF with low-frequency vibration, the punch force and the deformation resistance were lower than those in a deep-drawing test without low-frequency vibration.

318 Optimization of variable blank holder force trajectory in deep drawing process

2016 ◽  
Vol 2016.53 (0) ◽  
pp. _318-1_-_318-5_
Author(s):  
Hiroki KOYAMA ◽  
Satoshi KITAYAMA ◽  
Takuya NODA ◽  
Ken YAMAMICHI ◽  
Kiichiro KAWAMOTO
Keyword(s):  
Deep Drawing ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Variable Blank Holder Force

Simulation Study on Forming Process of the Inner Panel of Automobile Front Fender

2011 ◽  
Vol 291-294 ◽  
pp. 335-338
Author(s):  
Ying Tong
Keyword(s):  
Simulation Study ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Simulation Results ◽  
Forming Defects

According to the shape character of some one automobile inner panel of front fender the forming steps characterized by some process combined was brought forward. Based on FEM software the drawing process was simulated by a blank-holder force scheme 100000N, 200000N, 300000N. As the simulation results, in order to eliminate the fractures in diagonal reinforcements, it is infeasible only to decrease blank-holder force, but enlarging the die round corner is necessary. As fractures have been eliminated, in order to eliminate wrinkles, the blank-holder force needs to be increased. Otherwise the wrinkle region can be confined into useless area which needs to be cut off. Finally none forming defects occur as blank-holder force 300000N and die round corner 5mm.

scholarly journals Study on forming process and spring back control of high strength sheet based on Dynaform

2018 ◽  
Vol 232 ◽  
pp. 02039
Author(s):  
cunping Liu
Keyword(s):  
Velocity Profile ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Part ◽  
Drawing Process ◽  
Spring Back ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Motion Mode

The drawing process of a high strength steel part without blank holder force was numerically simulated based on Dynaform. In present investigation, the drawing velocity and velocity profile motion of punch was studied by simulating the drawing operation of high strength steel part. The results show that restricting drawing velocity and controlling velocity profile motion of punch could all reduce the spring back. The measure of restricting drawing velocity could reduce non-pressure forming spring back about 31% and Trapezoidal motion mode of punch is the most beneficial to reduce spring back.

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 Influence of the Blank Holder Force on Material Thinning during Forming of a Rectangular Part Made from Tailor Welded Blanks

2014 ◽  
Vol 1036 ◽  
pp. 344-348
Author(s):  
Aurelian Albut ◽  
Vlad Andrei Ciubotariu
Keyword(s):  
Deep Drawing ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Tailor Welded Blanks ◽  
Tailored Blanks ◽  
Welded Structure ◽  
Welding Line

The current work deals with numerical simulation connected to forming of a rectangular shaped part made from tailored blanks, having the welding line positioned symmetrical with respect to the part geometry. The objective was to study the relation between the blank holder force applied during forming and the thinning of the parents materials. All the parameters are fixed except the blank holder force, its variation will cause variation of the material thinning. The presented work is trying to demonstrate the important role of the blank holder force on the material thinning during the deep drawing process. It must be mentioned that both materials from the welded structure are having the same thickness (1mm). The Dynaform 5.8.1 software is used to simulate the forming process. The part obtained after each simulation is analyzed and measured to quantify the on the material thinning. All the parameters are maintained fixed except the blank holder force. The obtained results for five different binder forces (5, 10, 30, 50, 70 kN) were compared to realise the behaviour of the tailor welded blanks during deep drawing process. In the final part of this paper conclusions regarding the influence of the blank holder force on the material thinning are presented.

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