Effect of Material Damage on Thermal Forming Limit Prediction for Hot Stamping

2017 ◽  
Author(s):  
W. Q. Liu ◽  
P. Hu ◽  
L. Ying ◽  
D. T. Wang
Keyword(s):  
Hot Stamping ◽  
Forming Limit ◽  
Material Damage ◽  
Thermal Forming

A thermal forming limit prediction method considering material damage for 22MnB5 sheet

2017 ◽  
Vol 92 (1-4) ◽  
pp. 627-638 ◽  
Author(s):  
Ping Hu ◽  
Wenquan Liu ◽  
Liang Ying ◽  
Jinghuang Zhang ◽  
Dantong Wang
Keyword(s):  
Prediction Method ◽  
Forming Limit ◽  
Material Damage ◽  
Thermal Forming

Formability Improvement Technique for Heated Sheet Metal Forming by Partial Cooling

2014 ◽  
Vol 622-623 ◽  
pp. 279-283 ◽  
Author(s):  
Eiichi Ota ◽  
Yasuhiro Yogo ◽  
Takamichi Iwata ◽  
Noritoshi Iwata ◽  
Kenjiro Ishida ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Sheet Metal ◽  
Deep Drawing ◽  
Initial Temperature ◽  
Hot Stamping ◽  
Local Deformation ◽  
Control Technique ◽  
Forming Limit ◽  
Forming Process ◽  
Initial Temperature Distribution

A forming process for heated sheet metal, such as hot-stamping, has limited use in deformable shapes. Higher temperature areas which have not yet come into contact with dies are more easily deformed; therefore, local deformation occurs at these areas which leads to breakage. To improve the formability of heated sheet metal, a deformation control technique utilizing the temperature dependence of flow stress is proposed. This technique can suppress local deformation by partial cooling around potential cracking areas to harden them before forming. In order to apply this technique to a variety of product shapes, a procedure to determine a suitable initial temperature distribution for deep drawing and biaxial stretching was developed with a coupled thermal structural simulation. In this procedure, finite elements exceeding forming limit strain are highlighted, and an initial temperature distribution is defined with areas of decreased temperature around the elements to increase their resistance to deformation. Subsequently, the partial cooling technique was applied to a deep drawing test with a heated steel sheet. The results of the experiment showed that the proposed technique improved 71% in the forming limit depth compared with results obtained using a uniform initial temperature distribution.

Structure Analysis and Quality Prediction of DP Steel Engine Hood in the Process of Hot Stamping

2013 ◽  
Vol 791-793 ◽  
pp. 558-561
Author(s):  
Zhi Ping Zhang ◽  
Han Wu Liu ◽  
Tian Xiang Chen ◽  
Zhang Yi Yu
Keyword(s):  
Hot Stamping ◽  
High Strength Steels ◽  
High Strength ◽  
Forming Limit ◽  
Dp Steel ◽  
Performance Requirements ◽  
Stamping Process ◽  
Work Hardening Rate ◽  
Initial Work ◽  
Parts Manufacturing

Due to its good formability characteristics, such as high strength, high initial work hardening rate, as well as continuous yielding, thin-walled DP steel possesses great advantages of weight loss and security, and has been used to replace ordinary steel for automotive parts manufacturing by a lot of automotive industry. But along with the improvement of the performance of the strength, the high strength steels formability is worsened dramatically, and failure and fracture often occurs in its cold stamping process. So, hot stamping technology must be adopted to make the formability available. In the paper, it took the hot stamping process of DP steel engine hood for example and took DP800 as object of research. The forming limit, variation of major strain, minor strain and thickness, as well as the potential equality defects were analyzed by using eta/DYNAFORM software. The research results show that duplex steel plate can meet the performance requirements of car engine dumping plank forming, which offers theory basis for the production of similar parts.

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