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Research Papers

An Analytical Method for Prediction of Limiting Drawing Ratio For Redrawing Stages of Axisymmetric Deep Drawn Components

[+] Author and Article Information
Ali Fazli

Mechanical Engineering Department,
Faculty of Engineering and Technology,
Imam Khomeini International University,
Qazvin, Iran
e-mail: a.fazli@eng.ikiu.ac.ir

Behrooz Arezoo

CAD/CAM Research Center,
Mechanical Engineering Department,
Amirkabir University of Technology
(Tehran Polytechnic),
Hafez Street,
Tehran, Iran
e-mail: arezoo @aut.ac.ir

1Corresponding author.

Manuscript received March 9, 2013; final manuscript received November 21, 2013; published online January 16, 2014. Assoc. Editor: Gracious Ngaile.

J. Manuf. Sci. Eng 136(2), 021012 (Jan 16, 2014) (10 pages) Paper No: MANU-13-1089; doi: 10.1115/1.4026125 History: Received March 09, 2013; Revised November 21, 2013

In this paper, an analytical method for estimating the limiting drawing ratio (LDR) of the redrawing stages in deep drawing process of axisymmetric components is represented. In this method, the effects of parameters of blankholder arc, die arc, and punch arc region are taken into account for the analytical determination of LDR. The presented method can predict the limiting drawing ratio for redrawing with/without intermediate annealing processes. The results are compared to numerical results and experimental results reported in the literature and also industrial results reported in handbooks. It is shown that the presented method is in good agreement with the experimental and numerical results. Using the presented method, the effect of some process parameters on the LDR is investigated. It is shown that process parameters such as, coefficient of friction, strain hardening exponent, normal plastic anisotropy ratio, ratio of die arc radius to blank thickness and ratio of blank thickness to diameter has significant effect on the LDR. The effect of intermediate annealing process is also examined.

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Copyright © 2014 by ASME
Topics: Stress , Blanks , Annealing
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References

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Figures

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Fig. 1

Situations that may occur in redrawing operations (a) rc0 - rc1 < rpa0 + rda1 (b) rc0 - rc1 ≥ rpa0 + rda1

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Fig. 2

Stresses on an element in the blank holder arc region

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Fig. 3

Stresses on an element in the die arc region [6]

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Fig. 4

Stresses on an element in the punch arc region

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Fig. 7

Two drawing ratios and comparison of their strain distribution to FLD for third drawing stage. (a) Failed. (b) Successful.

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Fig. 6

Two drawing ratios and comparison of their strain distribution to FLD for second drawing stage. (a) Failed. (b) Successful.

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Fig. 5

Two drawing ratios and comparison of their strain distribution to FLD for first drawing stage. (a) Failed. (b) Successful.

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Fig. 8

comparison of calculated LDR for redrawing operations with values suggested in handbook of metal forming [19]. (a) 1st redrawing stage, (b) 2nd redrawing stage, (c) 3rd redrawing stage, (d) 4th redrawing stage

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Fig. 9

Effect of strain hardening exponent on the LDR of first redrawing stage

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Fig. 10

Effect of coefficient of friction on the LDR of first redrawing stage

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Fig. 11

Effect of normal anisotropy on the LDR of the first redrawing stage

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Fig. 12

Effect of ratio of die arc radius to sheet thickness on the LDR of first redrawing stage

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Fig. 13

Effect of coefficient of friction between blank and punch arc on the LDR of first redrawing stage

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Fig. 14

Effect of drawing ratio of first stage on the LDR of first redrawing stage

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