A Consideration on Deep-Drawability of Commercially Pure Aluminum Sheets

1985 ◽  
Vol 107 (4) ◽  
pp. 379-386
Author(s):  
N. Kawai ◽  
T. Mori ◽  
N. Hayashi ◽  
A. Eguchi ◽  
Y. Yasui
Keyword(s):  
Fracture Strength ◽  
Strain Path ◽  
Pure Aluminum ◽  
Drawing Ratio ◽  
Weak Correlation ◽  
Deep Drawability ◽  
Aluminum Sheets ◽  
Commercially Pure ◽  
Future Problem ◽  
R Value

Correlation between the deep-drawability of commercially pure aluminum sheets and the r value is investigated in detail. First, sheets with various r values are specially made for this study, and the conditions for making extra high r-value sheets are clarified. Then, it is found from the deep-drawability test that the limiting drawing ratio has a positive though weak correlation with r value. The reasons are considered both from the standpoints of drawing resistance and fracture strength and attributed to the variations of the r value during working. As a result, finding a strain path to enhance the r value is considered to be a future problem in the improvement of deep-drawability.

Assessment of Deep-Drawability of Mild Steel Sheets in Consideration of r-Value Change During Processing

1988 ◽  
Vol 110 (4) ◽  
pp. 376-383 ◽  
Author(s):  
N. Kawai ◽  
N. Hayashi ◽  
S. Matsui
Keyword(s):  
Mild Steel ◽  
Pure Aluminum ◽  
Plastic Anisotropy ◽  
Drawing Ratio ◽  
Deep Drawability ◽  
Steel Sheets ◽  
Aluminum Sheets ◽  
Commercially Pure ◽  
Strain Paths ◽  
R Value

In the previous study, it was found that the plastic anisotropy of commercially pure aluminum sheets changed during the deep-drawing process, and that this change influenced markedly the deep-drawability. In the present study we discuss the deep-drawability of mild steel sheets with a crystal structure different from aluminum. The following have been confirmed: (1) The limiting drawing ratio correlates positively and nonlinearly with average r value (r¯ value). (2) Fracture strength correlates positively with r¯ value as in the theory, but the relation between them is nonlinear. Maximum drawing load remains almost constant irrespective of r¯ value against the theory. These relations can be connected with the result of (1). (3) The relations in (2) can be explained by the r¯ value measured from sheets prestrained in equibiaxial tension and pure shear, which resemble the strain paths of fracture site at punch profile and flange, respectively. (4) The results of (2) and (3) are quite different from those of commercially pure aluminum sheets.

Effects of lubrication and strain path on constrained groove pressing of commercially pure aluminum sheets

2019 ◽  
Vol 103 (1-4) ◽  
pp. 511-527 ◽  
Author(s):  
Zongshen Wang ◽  
Tao Wang ◽  
Yanjin Guan ◽  
Xiuting Wei ◽  
Xiaoying Fang ◽  
...  
Keyword(s):  
Strain Path ◽  
Pure Aluminum ◽  
Aluminum Sheets ◽  
Commercially Pure

Effects of Punch Cross-Section on Deep-Drawability of Square Shell of Aluminum Sheet

1987 ◽  
Vol 109 (4) ◽  
pp. 355-361 ◽  
Author(s):  
N. Kawai ◽  
T. Mori ◽  
H. Hayashi ◽  
F. Kondoh
Keyword(s):  
Crack Initiation ◽  
Cross Section ◽  
Pure Aluminum ◽  
Metal Flow ◽  
Aluminum Sheet ◽  
Forming Limit ◽  
Planar Anisotropy ◽  
Deep Drawability ◽  
Commercially Pure ◽  
Relief Effect

Effects of product shape and a planar-anisotropy on a square shell drawability were studied, using commercially pure aluminum sheet. Two phenomena were mainly considered to affect a forming limit: (a) the prevention of crack initiation at the corner of a punch by adjacent straight punch profile regions, (b) the metal flow in the flange region from the corner to the straight side, the “Strain Relief Effect,” which serves to decrease the deformation at the corner.

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