UHS Steel Formability in Flexible Roll Forming

2009 ◽  
Vol 410-411 ◽  
pp. 661-668 ◽  
Author(s):  
Kari Mäntyjärvi ◽  
Marion Merklein ◽  
Jussi A. Karjalainen
Keyword(s):  
High Strength ◽  
Experimental Tests ◽  
Single Step ◽  
Manufacturing Technology ◽  
Roll Forming ◽  
Bending Tests ◽  
Air Bending ◽  
Flexible Roll Forming ◽  
The Poor ◽  
Flexible Roll

Ultra-high-strength (UHS) steels are very interesting materials for many applications where high strength can be utilized to create lighter and more effective constructions. The poor formability of UHS steels, however, may limit the usefulness of these materials in many applications. In this work, some experiments using a flexible roll forming machine developed at the Chair of Manufacturing Technology (LFT), University of Erlangen-Nuremberg were carried out using 4mm-thick bainitic martensitic UHS steels (YS/TS 960/1000 and 1100/1250) and the outcomes have been analysed. Results of these experimental tests show that using roll forming it is possible to bend test materials to an angle of 90º without damages with an evidently smaller radius than in air bending. The radius obtained using roll forming can be as small as 40% of the value used in air bending. Tests also show that with the method used in these tests it is possible to make roll forming for the whole length of the plate. The tests proved that the NC-controlled single-step roll forming method has potential for manufacturing small batches of bend profiles; however, more development has to be carried out if the process is to be made suitable for industry.

Analysis of Flexible Roll Forming Process with Arc Shape Panel

2015 ◽  
Vol 799-800 ◽  
pp. 439-442
Author(s):  
Ya Zhang ◽  
Dae Hwan Yoon ◽  
Dong Won Jung
Keyword(s):  
Cross Sections ◽  
High Strength ◽  
Variable Cross Section ◽  
Roll Forming ◽  
Variable Cross ◽  
Transportation Engineering ◽  
Forming Process ◽  
Flexible Roll Forming ◽  
Flexible Roll ◽  
Arc Shape

Roll forming is a highly useful and important forming technique for sheet metal. As an economic profile product, roll forming products are widely used in transportation, engineering machinery, and civil construction because of their uniform sections, high strength, and low energy consumption[1]. Roll forming is a rapid processing operation used for transforming flat sheets of material into useful profiled sections. However, a lot of components used in the automobile, railway cars, ship construction, and building industries have variable cross sections. Therefore, flexible roll forming was developed recently to produce variable cross section profiles.

scholarly journals Flexible roll forming of U-section product with curved bending profile using advanced high strength steel

2018 ◽  
Vol 15 ◽  
pp. 782-787
Author(s):  
Jinn-Jong Sheu ◽  
Chan-Fu Liang ◽  
Cheng-Hsien Yu ◽  
Wei-Chung Hsu ◽  
Pin-Kun Lee
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Roll Forming ◽  
Advanced High Strength Steel ◽  
Flexible Roll Forming ◽  
Flexible Roll

Track Simulation of Flexible Roll Forming Based on VC++ and OpenGL

2012 ◽  
Vol 457-458 ◽  
pp. 304-307
Author(s):  
Wen Ting Sun ◽  
Qiang Li ◽  
Bo Qian
Keyword(s):  
Rotation Angle ◽  
High Strength ◽  
Roll Forming ◽  
Interpolation Algorithm ◽  
Nc System ◽  
Flexible Roll Forming ◽  
Forming Technology ◽  
Core Module ◽  
Flexible Roll ◽  
Track Simulation

How to manufacture high accuracy, complex section, high strength steel products is the current challenge of flexible roll forming technology. This article introduced opening NC system application in flexible roll forming, both in software and in hardware. As the core module of the software system, the interpolation module was discussed. The article mainly focused on how to establish track simulation module. According to the algorithm, we calculated the roller displacement and rotation angle using VC++. At last the simulation processes and results were presented, which prove the trace interpolation algorithm is correct and feasible.

Application of Support Vector Regression and Genetic Algorithm to Reduce Web Warping in Flexible Roll-Forming Process

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Young Yun Woo ◽  
Dae-Cheol Ko ◽  
Taekyung Lee ◽  
Yangjin Kim ◽  
Ji Hoon Kim ◽  
...  
Keyword(s):  
Process Parameters ◽  
Optimization Method ◽  
Roll Forming ◽  
Support Vector ◽  
Forming Process ◽  
Flexible Roll Forming ◽  
Flexible Roll ◽  
Roll Forming Process ◽  
Web Warping ◽  
The Web

Abstract In a flexible roll-forming process, a metal blank is incrementally deformed into the desired shape with a variable cross-sectional profile by passing the blank through a series of forming rolls. Because of the combined effects of process and material parameters on the quality of the roll-formed product, the approaches used to optimize the roll-forming process have been largely based on experience and trial-and-error methods. Web warping is one of the major shape defects encountered in flexible roll forming. In this study, an optimization method was developed using support vector regression (SVR) and a genetic algorithm (GA) to reduce web warping in flexible roll forming. An SVR model was developed to predict the web-warping height, and a response surface method was used to investigate the effect of the process parameters. In the development of these predictive models, three process parameters—the forming-roll speed condition, leveling-roll height, and bend angle—were considered as the model inputs, and the web-warping height was used as the response variable. The GA used the web-warping height and the cost of the roll-forming system as the fitness function to optimize the process parameters of the flexible roll-forming process. When the flexible roll-forming process was carried out using the optimized process parameters, the obtained experimental results indicated a reduction in web warping. Hence, the feasibility of the proposed optimization method was confirmed.

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