Effect of Die Radius on Blank Holder Force and Drawing Ratio: A Model and Experimental Investigation

The current work investigates anisotropy and forming characteristics of ZE10 Mg alloy. Anisotropic effects are measured by analysing tensile tests data for the specimens from 0o, 45o and 90o rolling directions of thin sheet of 0.8 mm thickness. The effects of temperature and strain rates are also included in anisotropic analyses. The mechanical properties of ZE10 alloy are affected by the physical conditions like temperature and strain rates. The effect is significant on yield strength, UTS and fracture strain while small variation is observed in case of Young’s modulus. Deep drawing experiments have been done to investigate the effects of temperature on forming characteristics and limit drawing ratio (LDR) of an alloy. Forming investigation shows that it is difficult to produce a good or unfractured part at 100 oC, but it can be produce at 150 oC or higher with different combinations of blank holder force and drawing ratio. Also, LDR and blank holder force also effects required punch force.

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The Influence of N Values on Sheet Metal Deep Drawing Based on Different Blank Holder Forces

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.418-420.1364 ◽

2011 ◽

Vol 418-420 ◽

pp. 1364-1367

Author(s):

Jian Qing Qian ◽

Ji Ping Chen ◽

Hai Fan Qian

Keyword(s):

Finite Element ◽

Sheet Metal ◽

Deep Drawing ◽

Drawing Ratio ◽

Blank Holder Force ◽

Limit Drawing Ratio ◽

Blank Holder ◽

N Value ◽

Finite Element Software

The influence of hardening index n value at different holding forces on LDR of cylinder cup was simulated by the finite element software PAM-STAMP 2G. The results showed that the limit drawing ratio of the sheet metal decreased with the increase of the blank holder force. There was little influence of hardening index n value on the limit drawing ratio at smaller blank holder force. The influence of hardening index n value on the limit drawing ratio increased with the increase of the blank holder force. The hardening index n value could be increased to increase the limit drawing ratio when the blank holder force is large.

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Effect of the blank holder force on drawing of aluminum alloy square cup: Theoretical and experimental investigation

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2007.12.010 ◽

2008 ◽

Vol 206 (1-3) ◽

pp. 152-160 ◽

Cited By ~ 30

Author(s):

Halil. İbrahim Demirci ◽

Cemal Esner ◽

Mustafa Yasar

Keyword(s):

Experimental Investigation ◽

Aluminum Alloy ◽

Blank Holder Force ◽

Blank Holder

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Tribological Investigations on Coated Steel Sheets Using the Dry Film Lubricant Drylube E1

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.6-8.565 ◽

2005 ◽

Vol 6-8 ◽

pp. 565-572 ◽

Cited By ~ 2

Author(s):

Massimo Tolazzi ◽

M. Meiler ◽

Marion Merklein

Keyword(s):

Good Alternative ◽

Homogeneous Distribution ◽

Drawing Ratio ◽

Drawing Force ◽

Blank Holder Force ◽

Punch Force ◽

Blank Holder ◽

Steel Sheets ◽

Steel Grades ◽

Dry Film

Tribological aspects strongly influence the deep drawing behaviour of sheet metal, being responsible for both the punch force and the material draw-in from the flange. Recent developments in lubrication technology have shown that dry film lubricants can be a good alternative to conventional fluid lubricants in case of aluminium sheets. Their main advantages are the homogeneous distribution on the blank surface, the good adhesion to the surface and the possibility of applying it already in the rolling mill. In order to introduce this technology in series production also for steel sheets more knowledge concerning the influence of the lubricant amount on the drawing forces is needed. A further important aspect to be considered is the surface quality of the steel grades and its interactions with the dry lubricant. In this paper four steel grades with different mechanical and/or surface properties are considered. After a microscopical and topographical investigation of the surface the materials were tested in a cup drawing test after applying two different amounts of the dry film lubricant Drylube E1. Further process parameters which were varied are the blank holder force FN and the drawing ration b. In this way, information about the influence of the lubricant amount on both the drawing force and on the maximum blank holder force FZ could be obtained for three different values of b. The experimental results have shown how a strong decrease of the lubricant amount (from 1.0 down to 0.5 g/m2) causes, at a given drawing ratio, only a small increase in the maximum drawing force as well as a small increase in the maximum blank holder force.

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Determination of Proper Loading Profiles for Hydro-Mechanical Deep Drawing Process Using FEA

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.686.540 ◽

2014 ◽

Vol 686 ◽

pp. 540-548

Author(s):

S.B. Akay ◽

E.F. Şükür ◽

M. Turkoz ◽

S. Halkaci ◽

M. Koç ◽

...

Keyword(s):

Deep Drawing ◽

Manufacturing Process ◽

Sheet Material ◽

Fluid Pressure ◽

Process Conditions ◽

Hydraulic Pressure ◽

Drawing Ratio ◽

Blank Holder Force ◽

Blank Holder ◽

Force Profiles

Hydro-mechanical Deep Drawing (HMD) is an advanced manufacturing process developed to form sheet metal blanks into complex shapes with smooth surfaces using hydraulic pressure as an additional source of deformation force. There are many factors affecting the successful production of desired parts using this manufacturing process. The most important factors are the fluid pressure and blank holder force. Having proper values of these parameters during forming has a direct impact on part properties such as drawing ratio and thinning. In order to determine desired the fluid pressure and blank holder force profiles, which are different for every geometry, material and other process conditions, finite element simulations are conducted to save time and cost. Abaqus FEA software is used in this study. In order to define the continuously changing fluid pressure application area on the sheet material, which is not an available module or standard interface of software, sub-programs (sub-routines) are developed to properly and dynamically define the fluid pressure area. Proper, if not optimal, fluid pressure and blank holder force profiles, which allow the formability (LDR) of sheet material to be maximum, were obtained using trial and error method. Maximum thinning values on metal blank were used as a control parameter to determine if selected loading profiles result in the highest LDR with lowest thinning.

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