Deflection detection and curve fitting in three-roll continuous straightening process for LSAW pipes

Wang, Chunge; Yu, Gaochao; Wang, Wei

doi:10.1016/j.jmatprotec.2017.11.060

Cited by 24 publications

(6 citation statements)

References 15 publications

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“…This method combines the advantages of pressure straightening and roller straightening, and can be used for large and thin-walled pipes while maintaining efficiency. At the same time, a deflection detection device is integrated to help automate the straightening process [22]. This paper continues the systematic research on the new process, including numerical simulation analysis and experimental research.…”

Section: Introductionmentioning

confidence: 82%

A systematic study on three-roll continuous straightening process for LSAW pipes

Wang

Zhang

et al. 2022

Int J Adv Manuf Technol

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Aiming at the low efficiency and unstable accuracy of the current mold-pressing straightening for LSAW pipes, a three-roll continuous straightening process is proposed in this study, which uses the roller straightening instead of mold bending. According to the novel technology, the calculation model of theoretical straightening moment is derived based on the springback equation of plane bending with small curvature, and the calculation model of initial curvature is established for the new deflection detection method. Further, the numerical simulation analysis is carried out for the LSAW pipe case, and a straightening experimental platform is built for experiments. The research shows that the accuracy of theoretical moment equation required for straightening directly related to the initial curvature, rather than the fitting accuracy of deflection curve, and the low-order simple fitting curvature calculation model has the highest reliability. In order to control the section distortion and straightening blind area, the straightening roller should follow the equal diameter design principle, and the empirical formula of span estimation is given. Under the optimal conditions, the straightness of the corrected tubes can be controlled within 1.5‰ and the ovality of the section can be within 0.5%, which proves the feasibility and reliability of the new process. What's more, the straightening system built in this work, including process analysis software, is conducive to the automation and popularization of the new process.

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Section: Introductionmentioning

confidence: 82%

A systematic study on three-roll continuous straightening process for LSAW pipes

Wang

Zhang

et al. 2022

Int J Adv Manuf Technol

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“…At present, the roundness calibration process mainly includes the whole-diameter roundness calibration process [5,6], the over-bending roundness calibration process [7][8][9], and the roll-type roundness calibration process [10][11][12]. Common straightness calibration techniques include the pressure straightening [13][14][15] and the cross roll straightening [16][17][18][19]. The existing roundness and straightness calibration processes are done separately.…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism Analysis of Three-Roller Continuous and Synchronous Calibration Process of Straightness and Roundness For LSAW Pipes

Huang

Wang³

et al. 2021

Preprint

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Continuous and synchronous calibration process of straightness and roundness for LSAW (Longitudinally Submerged Arc Welding, LSAW) pipes with three rollers is a bidirectional reciprocating bending process that includes axial and circumferential directions. It is particularly important to reveal the deformation mechanism, which provides theoretical support for the calibration process to be applied to actual production. Based on this, through the combination of references, theoretical analysis and numerical simulation, the deformation mechanism is analyzed in this paper. The whole deformation process of pipe is modeled and then numerically simulated with FEM software of ABAQUS. The results show that reciprocating bending can eliminate the difference of initial curvature, so that the axial curvature and circumferential curvature are unified to the same direction and value respectively. The synergy between the axial reciprocating bending straightening process and the circumferential reciprocating bending rounding process realizes the calibration process of LSAW pipes. The simulation results support the theoretical results, and the deformation is mainly caused by axial stress and circumferential stress.

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“…Leveling can also be used to level bar and pipe. Pei et al 14 and Wang et al 15 proposed a three-point parabolic fitting method and a flow chart of prediction application of bending straightening model to predict the press head downfeed distance to level the shaft and longitudinally submerged arc-welded (LSAW) pipe according to its initial measured bending shape. They increased the press head load until the real-time curvature is close enough to the calculated bending curvature.…”

Section: Introductionmentioning

confidence: 99%

An analytical study of optimal roller intermeshes for the plate leveling process

Liu

Luo

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Leveling process is usually used to minimize the plate defects including flatness imperfections and uniformity of internal stress in the plate industry. Roller intermeshes are important parameters in the leveling process to ensure the high-quality leveled plate. Some current researches treat the plate as a simple beam and ignore the stress superimposed effect to study how to set the roller intermeshes. This article presents an analytical optimization model to search the optimal entry and exit intermeshes for each incoming plate with consideration of the relationship between the roller intermeshes and bending curvatures during the whole leveling process. The optimization model was solved and the results were verified with production data. The relationship between the optimal roller intermeshes and plate thickness, yield stress, and Young’s modulus were discussed in details. It was found out that the roller intermeshes can be set the same for different incoming plates but with equal elastic limit curvature. A four-dimensional database of optimal roller intermeshes about different elastic limit curvature, expected plastic strain ratios, and roller spaces was built. The roller intermeshes can be quickly tracked in less than 1 s as long as the thickness, yield stress, and Young’s modulus of incoming plate and roller space are given according to the database so that it can be used effectively on the leveling production line.

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Deflection detection and curve fitting in three-roll continuous straightening process for LSAW pipes

Cited by 24 publications

References 15 publications

A systematic study on three-roll continuous straightening process for LSAW pipes

A systematic study on three-roll continuous straightening process for LSAW pipes

Deformation Mechanism Analysis of Three-Roller Continuous and Synchronous Calibration Process of Straightness and Roundness For LSAW Pipes

An analytical study of optimal roller intermeshes for the plate leveling process

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