Influence of the Punch Geometry and Sample Size on the Deep-Drawing Limits in Expansion of an Aluminium Alloy

Boissière, R.; Vacher, Pierre; Blandin, Jean‐Jacques

doi:10.1007/s12289-010-0725-0

Cited by 4 publications

(2 citation statements)

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“…Figure 7 and Figure 8 showed the thickness and stress distributions of the drawn part that occurred in the deep drawing process for Case I with R D = 5 mm, R D1 = 2 mm and R P = 0.8 mm. The numerical results in Figure 7 showed that the drawn part could be punctured on two corners as visible white areas due to too high thinning [ 16 , 17 ]. Especially, the deepest corner of the rectangular shaped pocket (point F) was easy to puncture, and was chosen to be examined in this study.…”

Section: Resultsmentioning

confidence: 99%

“…With high peak pressure in the deep drawing process, the failure was at one of the bottom corners where the biaxial stretching was predominant mode of deformation and the thinning in this area was found to be 23–24% at failure. Robert Boissiere et al [ 17 ] examined the effects of punch shapes on the deep drawing limits in expansion. Two punch shapes including the flat punch and the spherical punch were considered with the sheet material of aluminium alloy 2024.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Tool Geometry Parameters on the Formability of a Camera Cover in the Deep Drawing Process

Trung

Minh

2021

Materials

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The formability of the drawn part in the deep drawing process depends not only on the material properties, but also on the equipment used, metal flow control and tool parameters. The most common defects can be the thickening, stretching and splitting. However, the optimization of tools including the die and punch parameters leads to a reduction of the defects and improves the quality of the products. In this paper, the formability of the camera cover by aluminum alloy A1050 in the deep drawing process was examined relating to the tool geometry parameters based on numerical and experimental analyses. The results showed that the thickness was the smallest and the stress was the highest at one of the bottom corners where the biaxial stretching was the predominant mode of deformation. The problems of the thickening at the flange area, the stretching at the side wall and the splitting at the bottom corners could be prevented when the tool parameters were optimized that related to the thickness and stress. It was clear that the optimal thickness distribution of the camera cover was obtained by the design of tools with the best values—with the die edge radius 10 times, the pocket radius on the bottom of the die 5 times, and the punch nose radius 2.5 times the sheet thickness. Additionally, the quality of the camera cover was improved with a maximum thinning of 25% experimentally, and it was within the suggested maximum allowable thickness reduction of 45% for various industrial applications after optimizing the tool geometry parameters in the deep drawing process.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%