scholarly journals Improvement in Stretch Flange Ability of High-Tensile-Strength Steel Sheets by Piercing under Tension Using Humped Bottom Punch

2012 ◽  
Vol 53 (617) ◽  
pp. 569-573 ◽  
Author(s):  
Yuzo TAKAHASHI ◽  
Satoshi HORIOKA ◽  
Osamu KAWANO ◽  
Masahiro OHARA ◽  
Kohsaku USHIODA
Keyword(s):  
Tensile Strength ◽  
High Tensile Strength ◽  
Steel Sheets

scholarly journals Improvement in Formability of Hot Rolled High Tensile Strength Steel Sheets by Cerium Addition

1975 ◽  
Vol 15 (3) ◽  
pp. 137-144 ◽  
Author(s):  
Takashi MATSUOKA ◽  
Toshihiko KAWAI ◽  
Yoshihiko HOBO ◽  
Shin-ya UEDA
Keyword(s):  
Tensile Strength ◽  
High Tensile Strength ◽  
Steel Sheets ◽  
Hot Rolled

Improvement in Punching Properties of High Tensile Strength Steel Sheet by Heat-Treatments for Reduction of Center Segregation

2014 ◽  
Vol 622-623 ◽  
pp. 1075-1080 ◽  
Author(s):  
Kota Sakumoto ◽  
Kazuhiko Yamazaki ◽  
Takashi Kobayashi ◽  
Shinsuke Suzuki
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Crack Formation ◽  
Expansion Ratio ◽  
High Tensile Strength ◽  
Burr Height ◽  
Hole Expansion ◽  
Steel Sheets ◽  
Heat Treated ◽  
Hole Expansion Ratio

We investigated punching properties (crack in punched surface and hole expansion ratio) of high tensile strength steel sheets with and without center segregation. High strength steel sheets were heat-treated to reduce center segregation. Tensile strength, shear surface ratio, depth of rollover and burr height were measured on heat-treated steel sheets to confirm the effect of heat-treatment on strength. The EPMA analysis showed that the center segregation of Mn was reduced by the diffusion during heat-treatment. Crack-formation frequency and hole expansion ratio were also measured. As a result, the center segregation of Mn in high tensile strength steel sheets decreased by the heat-treatment (600 oC for 100 h) with maintaining the tensile strength, the depth of rollover and the burr height. The crack-formation frequency of the steel sheets decreased through heat-treatments.

Reduction of Springback in Hat Channel with High-Strength Steel Sheetby Stroke Returning Deep Drawing

2013 ◽  
Vol 554-557 ◽  
pp. 1320-1330 ◽  
Author(s):  
Taro Geka ◽  
Masayuki Asakura ◽  
Takuma Kiso ◽  
Takashi Sugiyama ◽  
Masato Takamura ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Deep Drawing ◽  
High Strength Steel ◽  
High Strength ◽  
New Method ◽  
Dual Phase ◽  
High Tensile Strength ◽  
Blank Holder ◽  
Steel Sheets

This study investigated the twisting phenomenon in curved hat channel products made of dual-phase 980-MPa-class high-tensile-strength steel sheets. The stroke returning deep drawing (SRDD) method was proposed to deal with twisting. In this new method, after the punch reaches the bottom dead point, it returns to a certain drawing height without the blank holder being removed. With the application of the SRDD method, twisting hardly occurred, but sidewall curl increased. A two-step SRDD was then proposed to reduce the sidewall curl of SRDD products. In the two-step SRDD method, a stroke returning process is carried out in two steps under different conditions. The results showed that the two-step SRDD method reduced the sidewall curl and twist simultaneously.

scholarly journals Theoretical predictions of fracture and springback for high tensile strength steel sheets under stretch bending

2017 ◽  
Vol 207 ◽  
pp. 1594-1598 ◽  
Author(s):  
Takeshi Uemori ◽  
Tetsuo Naka ◽  
Naoya Tada ◽  
Hidenori Yoshimura ◽  
Takashi Katahira ◽  
...  
Keyword(s):  
Tensile Strength ◽  
High Tensile Strength ◽  
Steel Sheets ◽  
Stretch Bending ◽  
Theoretical Predictions

Reduction of Cracks During Punching Process by Cementite in High Tensile Strength Steel Sheets

2018 ◽  
Vol 50 (2) ◽  
pp. 884-893 ◽  
Author(s):  
Takehiro Okano ◽  
Chikara Inoue ◽  
Shinsuke Suzuki ◽  
Kazuhiko Yamazaki ◽  
Shunsuke Toyoda
Keyword(s):  
Tensile Strength ◽  
High Tensile Strength ◽  
Steel Sheets ◽  
Punching Process
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