Defect Prediction and Control for Ultra-high-strength Steel Complex Structure in Hot Forming Based on FEM

2015 ◽  
Vol 24 (6) ◽  
pp. 2390-2400
Author(s):  
Xin Shang ◽  
Jie Zhou ◽  
Fang Zhuo ◽  
Yan Luo ◽  
Yang Li
Keyword(s):  
High Strength Steel ◽  
Complex Structure ◽  
High Strength ◽  
Hot Forming ◽  
Defect Prediction ◽  
Ultra High Strength Steel ◽  
Prediction And Control ◽  
And Control

Quenchability improvement and control simplification by ice mandrel in hot stamping of ultra-high strength steel hollow parts

2021 ◽  
Vol 64 ◽  
pp. 916-926
Author(s):  
Ali Talebi-Anaraki ◽  
Tomoyoshi Maeno ◽  
Ryohei Ikeda ◽  
Kazui Morishita ◽  
Ken-ichiro Mori
Keyword(s):  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Ultra High Strength Steel ◽  
And Control

Hot Forming Technique and Its Equipments for Ultra High Strength Steel

2010 ◽  
Author(s):  
Ning Ma ◽  
Ping Hu
Keyword(s):  
High Strength Steel ◽  
Chemical Engineering ◽  
Cooling System ◽  
High Strength ◽  
Hot Forming ◽  
Continuous Heating ◽  
Step Method ◽  
Three Point Bending ◽  
Ultra High Strength Steel ◽  
One Step

Hot forming of ultra high strength steel is an advanced forming technique which can not only represent the best solution to increasing the strength-to-mass ratio of sheet components, but also meet the need of higher passive safety and weight reduction. Based on independently developed mass production line of hot forming, its key forming and quenching technique and relative equipments are proposed and described, including multi-step and one-step method, die manufacturing with cooling system, continuous heating furnace and integrated manufacturing system composed of the advanced interdisciplinary technology of machining, electronic control, material and chemical engineering. Then the automobile body components are produced by the developed equipments of hot forming and moreover their mechanical properties are investigated. The typical tensile curve of the quenched components shows that the yield stress of the hot forming component is over 1000MPa, and the strength limitation is over 1600MPa. The three-point bending testing of the part is implemented. These experimental results indicate the validity of the developed technique and equipments.

Hot Forming Analysis of Car Door Bar for Ultra High Strength Steel

2010 ◽  
Vol 160-162 ◽  
pp. 836-841
Author(s):  
Yun Kai Gao ◽  
Da Wei Gao ◽  
You Zhi Deng ◽  
Wei Cao
Keyword(s):  
High Strength Steel ◽  
Thickness Distribution ◽  
High Strength ◽  
Simulation Method ◽  
Hot Forming ◽  
Forming Limit ◽  
Boron Steel ◽  
Shell Elements ◽  
Forming Simulation ◽  
Ultra High Strength Steel

Ultra high strength steel plays an important role of light weighting in automotive industry. The hot forming simulation of car door bar is processed with 22MnB5 ultra high strength boron steel. FEM is built with the 12 nodes shell elements and MAT 106 is selected in LS-DYNA. The hot forming processes include two heat transfers. One is the process from the oven to the tools after the blank is heated. The other is the process after the blank contacts the tools. The hot forming simulation results are obtained by LS-DYNA. The results show that the thickness distribution, the forming limit and the maximum effective plastic strain and other performances attain to standards. It is proved that the hot forming simulation method is correct.

Influences of Variable Friction Coefficient on the Hot Formability of Ultra High Strength Steel Sheet

2010 ◽  
Vol 154-155 ◽  
pp. 1450-1455
Author(s):  
Hai Yan Yu ◽  
Li Bao ◽  
You Zhi Deng ◽  
Wei Cao
Keyword(s):  
Friction Coefficient ◽  
High Strength Steel ◽  
Steel Sheet ◽  
Coupling Effect ◽  
High Strength ◽  
Hot Forming ◽  
Forming Simulation ◽  
Ultra High Strength Steel ◽  
Variable Friction ◽  
The One

Friction coefficient is an important parameter in sheet metal forming especially in hot forming. Friction condition not only influences material flow but also affects the thermal conductivity between blank and tools. In this study, varied friction coefficient is introduced to the hot forming simulation of B-pillar made of ultra high strength steel sheet 22MnB5. Three curves of friction coefficient vs. temperature are investigated. All of the heat transferred by conductivity, radiation and convection are considered in the simulation. And the temperature-dependent material and process parameters are supplied. It is demonstrated that the coupling effect among the strength and hardness of the metals, the properties of the oxide film covering blank surface and viscosity of the lubrication oil leads to the fact that the friction coefficient changes with temperature instead of constant during hot forming. The friction coefficient curve characterized by increasing first then decreasing gives the best simulation results and then is followed by the one which is characterized by decreasing first then increasing. The constant friction coefficient is the last.

Numerical and Experimental Investigation into Hot Forming of Ultra High Strength Steel Sheet

2010 ◽  
Vol 20 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Hongsheng Liu ◽  
Wei Liu ◽  
Jun Bao ◽  
Zhongwen Xing ◽  
Baoyu Song ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Hot Forming ◽  
Ultra High Strength Steel

Study on Hot Forming Process and Spring-Back of Ultra -High Strength Steel Based on ABAQUS

2012 ◽  
Vol 482-484 ◽  
pp. 2430-2437 ◽  
Author(s):  
De Sen Yang ◽  
Wen Liu ◽  
Guang Jun Hu ◽  
Jie Zhou ◽  
Zhu Su
Keyword(s):  
High Strength Steel ◽  
Simulation Analysis ◽  
Hot Stamping ◽  
High Strength ◽  
Hot Forming ◽  
Combination Method ◽  
Spring Back ◽  
Forming Process ◽  
Ultra High Strength Steel ◽  
Shaped Part

To research the key factor that affect on material characteristic of hot stamping, this paper studied the spring-back problem of hot forming of the ultra-high strength steel, "U" shaped part by using the combination method of numerical simulation and experimental verification. By obtaining the data of BR1500 HS isothermal tensile test, it established a "U" shaped part of thermal-mechanical coupled model which is based on ABAQUS to analyze the influences of forming speed and holding time on the forming properties. Simulation analysis showed that: When the forming speed of sheet metal is faster than 35mm/s, the rebound value is small, and further increase has no significant effect on the rebound; after holding 6s, the temperature quenching would become stable. The results verify the reliability of the finite element model. Also the study has provided a theoretical basis for determining the process parameters of the type of steel hot forming.

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