FE Simulation of Heat Assisted Roll Bending Process for Manufacturing Large and Thick High Strength Steel Axisymmetric Parts

2011 ◽  
Author(s):  
Tran Hoang Quan ◽  
Henri Champliaud ◽  
Zhengkun Feng ◽  
Thien-My Dao
Keyword(s):  
High Strength Steel ◽  
Fe Simulation ◽  
High Strength ◽  
Roll Bending ◽  
Bending Process

Analytical Modeling and FE Simulation for Analyzing Applied Forces During Roll Bending Process

2012 ◽  
Author(s):  
Hoang Quan Tran ◽  
Henri Champliaud ◽  
Zhengkun Feng ◽  
Thien-My Dao
Keyword(s):  
High Strength Steel ◽  
Plate Thickness ◽  
High Strength ◽  
Analytical Models ◽  
Francis Turbine ◽  
Roll Bending ◽  
Bending Process ◽  
Turbine Runner ◽  
Applied Forces ◽  
Corrosive Environments

High strength steel is widely used in the manufacturing of parts dealing with heavy cyclic loads and corrosive environments. However, processing this type of steel is not easy, and it becomes a hard-to-solve problem when the part to produce is large, thick and quasi-unique. One example of a thick high strength steel axisymmetric part is the conical shape of the crown of a Francis turbine runner. Some Francis turbine runners installed in the dam basement of a hydraulic power plant are 10 meters in diameter with more than 5 meters in height, while plate thickness can exceed 100 millimeters. Several processes can be envisaged for the manufacturing processes of such large parts (welding or casting…), but few processes can deliver one within a reasonable time and at competitive cost. Among them the roll bending process, causing plastic deformation of a plate around a linear axis with little or no change in plate thickness, is considered as an interesting alternative. The main objective of this research is to assess 3D dynamic finite element and analytical models for the computation of the bending forces during the manufacturing of hollow conical parts made of a thick plate and a high strength steel. Numerous parameters such as thickness, curvature, part size, material properties and friction directly influence the reaction forces on the rolls. Therefore, the results of this research provide a better understanding of the phenomena taking place in the process, and an opportunity to establish relationships between the bending forces and the parameters of a final conical part.

Effect of Counter Punch Pressure on Springback of High Strength Steel Sheet

2014 ◽  
Vol 939 ◽  
pp. 305-312 ◽  
Author(s):  
Komgrit Lawanwong ◽  
Hiroshi Hamasaki ◽  
Ryutaro Hino ◽  
Fusahito Yoshida
Keyword(s):  
Final Stage ◽  
Steel Sheet ◽  
Fe Simulation ◽  
Kinematic Hardening ◽  
High Strength ◽  
Dual Phase ◽  
Clamping Force ◽  
Bending Process ◽  
A New Technique ◽  
Punch Pressure

To reduce springback in U-bending the present paper proposes a new technique where the bottom of a U-bent part is clamped between a punch and a counter-punch during bending and it is pushed up with the counter punch at the final stage. The effect of counter punch pressure, both in sheet clamping and bottoming, was investigated by performing experiments on dual phase 590MPa and TRIP 780MPa HSS sheets. From the experiment, an appropriate combination of the clamping force and the final pushing-up force was found where springback was reduced to almost zero. To investigate the mechanism of the reduction of springback in the above three-step U-bending process, FE simulation of the bending with PAM-STAMP 2G was also conducted where the advanced kinematic hardening Yoshida-Uemori model was employed.

Influence of Lubricants on Advanced High Strength Steel Tubes in Bending Process

2009 ◽  
Author(s):  
Ramakrishna Koganti ◽  
Sergio Angotti ◽  
Isadora van Riemsdijk ◽  
Robert C. Nelson ◽  
Jill Smith
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Steel Tube ◽  
Application Site ◽  
Structural Components ◽  
Advanced High Strength Steel ◽  
Steel Tubes ◽  
Automotive Body ◽  
Bending Process ◽  
Lubricant Performance

To reach safety, emissions, and cost objectives, manufacturers of automotive body structural components shape thin gauge, high strength steel tube using a series of manufacturing steps that often include bending, preforming and hydroforming. Challenging grades and bend severity require a sensitive optimization of the tubular bending process. Lubricants play a significant role in establishing a successful bending process. In this study, the performance of two lubricants, Hydrodraw 551 and HFO 20, were investigated for bending Dual Phase 780 (DP780) and High Strength Low Alloy 350 (HSLA350) thin-walled steel tubes. Formability success was evaluated in terms of wrinkling, thinning strain and final geometry. Lubricant performance was found to be sensitive to grade and application site. HFO 20 was found to be a poor choice for bending DP780 tube.

Failure analysis of pre-stressed high strength steel bars used in a wind turbine foundation: Experimental and FE simulation

2015 ◽  
Vol 67 (4) ◽  
pp. 406-419 ◽  
Author(s):  
Y.-F. Wang ◽  
X.-F. Li ◽  
X.-L. Song ◽  
D.-Y. Dou ◽  
L.-M. Shen ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Wind Turbine ◽  
High Strength Steel ◽  
Fe Simulation ◽  
High Strength ◽  
Steel Bars

scholarly journals General Research on the Process of the Indirect Hot Stamping Ultra-High-Strength Steel

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1658
Author(s):  
Ziming Tang ◽  
Zhengwei Gu ◽  
Xin Li ◽  
Lijuan Zhu ◽  
Hong Xu ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Fe Simulation ◽  
Hot Stamping ◽  
High Strength ◽  
Tensile Tests ◽  
Punch Speed ◽  
Ultra High Strength Steel ◽  
Simulation Results ◽  
Two Stages ◽  
Quenching Time

Aiming at the need for lightweight requirements of the components in the bus, combined with the advantages of the hot stamping ultra-high-strength steel, a new television (TV) bracket was proposed. The finite element (FE) simulation of the beam part in the TV bracket during the indirect hot stamping process was discussed. After two-stages of pre-forming, the blank was in good formability and without visible cracks. According to the FE simulation results, the punch speed, quenching force, and quenching time significantly affected the temperature, microstructure, hardness, and mechanical properties of the beam part during hot stamping. With the increase of the quenching force and quenching time, the martensite fraction of the beam part was increased. For the beam part, the punch speed should be at least 80 mm/s during the forming stage. For complete quenching, the quenching force should be above 1000 kN and quenching time should be up to 10 s. Based on the parameters from the FE simulation, the forming experiment of the beam part was discussed. Microstructure analyses and microhardness tests as well as tensile tests of the hot stamping beam part were performed. The results confirmed that the FE simulation of the beam part was reliable.

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