Experimental investigations of the roll load and roll torque when high strength steel is roll formed

Lindgren, M.

doi:10.1016/j.jmatprotec.2007.03.041

Cited by 32 publications

(18 citation statements)

References 4 publications

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“…The author presented the results of several experimental tests, where the forces and torques were measured using different steels, thickness and bend angles. In 2006, the same author [3] validated a finite element model for roll forming of a U channel. The author conducted experimental tests recording the roll forces and torques, the longitudinal and transverse strain and the springback of the profile.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a numerical model for sheet metal roll forming

et al. 2010

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The latest trends in the automotive industry towards fuel efficient, lightweight and sustainable transport have increased the use of Ultra High Strength Steels in the body in white of the vehicles. However, the formability of these steels is poor at room temperature and new geometrical errors appear when they are formed using conventional forming processes. In this context, the conventional roll forming process is a very interesting process to form these new materials. Since the yield strength of these materials is higher, the risk of appearance of not desired longitudinal plastic strains decreases. On the other hand, using these materials higher spring back occurs in the profile and higher forces and amounts of energy are needed. The Finite Element simulation is a powerful tool to optimise the process and understand the complex behaviour of the strip during the roll forming processes. In the present work, a Finite Element model has been developed to model the roll forming process. Experimental tests have been performed using different Ultra High Strength Steels and the roll load, the roll torque, the longitudinal strain and the spring back of the profile have been measured experimentally. Finally, the validation of the finite element model has been made comparing numerical and experimental results.

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Section: Introductionmentioning

confidence: 99%

Development and validation of a numerical model for sheet metal roll forming

et al. 2010

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“…The computed error showed the reasonable value of 5% according to Eq. (8), where Φ c is the value of BF from each simulation condition and Φ a is the value of BF for the design variables from the objective function when the response surface method was used. As result, this objective function might acceptable for e the prediction of bowing amount in the 18 th pass.…”

Section: Optimal Design For Bfmentioning

confidence: 99%

“…Duggal et al [2] compared finite element (FE) simulation results to Bhattacharayya's experimental results. Other numerical [3][4][5][6] and experimental [7][8] studies have been performed.…”

Section: Introductionmentioning

confidence: 99%

Robust design of roll-formed slide rail using response surface method

Lee

Kim

2010

J Mech Sci Technol

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Roll-formed slide rail used as a linear guide in the smooth movement of drawers and electric home appliances requires geometric accuracy because of a high slenderness ratio and repetitive usage. The slide rail members are generally manufactured by the roll forming process. The members need to be improved through optimization of the roll forming process instead of the designer's experience. The aim of this study is to determine the optimal roll forming parameters by using robust optimization technique which simultaneously satisfies three criteria such as the shape difference factor, bowing factor and modified inverse safety factor. In analyzing the roll forming process of a slide rail, the pass in which the largest deformation occurred is designated as the target pass. The positions and the curvature of rolls are set as the design variables in the target pass. The cost function, which is comprised of the shape difference factor, the bowing factor, and the modified inverse safety factor, is obtained using design-of-experiments of the response surface method. The cost function is minimized by using robust optimization techniques and showed the improved the straightness and the durability value. Using robust design methodology, it is able to be constructed a multi-objective function, and optimized three criteria, simultaneously.

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“…Besides, springback and shape defects can be flexibly compensated by appropriate adjustment of roll positions [8]. The roll forming of U-channel made of AHSS, a characteristic component, was extensively studied by experiment [9] and simulation [10], and the influential factors to roll load were discussed.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on chain-die forming of the AHSS U-channel and contrast with roll forming

Sun

Xiao

et al. 2018

International Journal of Mechanical Sciences

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The performance of AHSS in chain-die forming is investigated by experiment and simulation.  The hardening model to describe the Bauschinger effect of the AHSS is established and implemented into the finite element model of chain-die forming process.  The evolutions of longitudinal strain and springback in the chain-die forming of the U-channel are investigated.  A systematic comparison between chain-die forming and roll forming of the U-channel are performed in terms of deformation mechanism, transitional surface, strain development and springback, etc.

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Experimental investigations of the roll load and roll torque when high strength steel is roll formed

Cited by 32 publications

References 4 publications

Development and validation of a numerical model for sheet metal roll forming

Development and validation of a numerical model for sheet metal roll forming

Robust design of roll-formed slide rail using response surface method

A numerical study on chain-die forming of the AHSS U-channel and contrast with roll forming

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