Thickness of Magnesium Alloy Cylindrical Cup in Pressure-Lubricating Deep Drawing

2012 ◽  
Vol 189 ◽  
pp. 147-151
Author(s):  
Xian Chang Mao ◽  
Hai Yan Lin
Keyword(s):  
Magnesium Alloy ◽  
Wall Thickness ◽  
Deep Drawing ◽  
Thickness Distribution ◽  
Blank Holder Force ◽  
Technological Parameters ◽  
Forming Process ◽  
Blank Holder ◽  
Deformation Behaviors ◽  
Cylindrical Cup

Forming process of AZ31B magnesium alloy cup parts in pressure-lubricating deep drawing was simulated by Dynaform at room temperature. The technological parameters which influence the wall thickness difference of cup parts were investigated in this paper, including internal pressure, blank holder force and punch corner radius, etc. Compared with the deformation behaviors of magnesium alloy in mechanical deep drawing and pressure-lubricating deep drawing, the wall thickness distribution of cup parts was discussed. The result shows that preferable deformation behaviors can be obtained in pressure-lubricating deep drawing when adopted adaptive technological parameters.

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.

Research on Deep Drawing with Multi-Point Variable Blank-Holder Force Controlling by Computer

2012 ◽  
Vol 472-475 ◽  
pp. 645-648
Author(s):  
Ming Ming Ding ◽  
Yong Huang ◽  
Yu Qing Shi
Keyword(s):  
Deep Drawing ◽  
Low Cost ◽  
Hydraulic Press ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Variable Blank Holder Force ◽  
Blank Holding Force ◽  
Working Principle ◽  
Cylindrical Cup ◽  
Set Up

On the basses of analyzing the defects of variable blank holder force hydraulic press on construction and its rigid being not enough,the realization of designing method,working principle,hydraulic and system for ne controlling w type upper multi-point deep drawing with variable blank—holding force controlled by computer was introduced.In order to verify the effect of application of this set up,the testing results of deep drawing a rectangular box and a cylindrical cup formed component was presented. The results show that the equipment has low cost, general in using and optimal efficient of controlling.

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.

The Influence of the Blank Holder Force during Forming Process of a U-Shaped Part Made from AZ31 Magnesium Alloy

2015 ◽  
Vol 809-810 ◽  
pp. 265-270
Author(s):  
Aurelian Albut ◽  
Valentin Zichil ◽  
Adrian Judele
Keyword(s):  
Magnesium Alloy ◽  
Sheet Metal ◽  
Elastic Recovery ◽  
Rolling Direction ◽  
Sheet Thickness ◽  
Bending Moment ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Shaped Part

In case of sheet metal forming the main dimensional errors are caused by the springback phenomena. The present work deals with numerical simulation related to draw bending and springback of U - shaped part made from magnesium alloy. The current paper is trying to prove out the important role of the blank holder force with respect to the forming process. Though novel approaches relating to the formality of magnesium alloy sheets, the change of springback due to the characteristic of each process should be verified by finite element method. Springback refers to the elastic recovery of deformed parts. Springback occurs because of the elastic relief from the bending moment imparted to the sheet metal during forming. Springback is mainly influenced by the sheet thickness, the punch and die profile radii, initial clearance between punch and die, friction conditions, rolling direction of the materials, blankholder force and by material properties. In this study, the magnesium alloy strips with two types of material having the thickness of 1mm, are used to investigate springback characteristics in U-shape bending. The Dynaform 5.6 software was used to simulate the forming process, in which the blank holder force takes values between 15 and 35 kN. In this study, the springback was analyzed by U-forming at room temperature conditions with different blank holder forces. Springback decreased with the increase of the blank holding force. Excessive holding force cause irregular thinning of the material, especially in the radius area.

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.

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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