Continuous flexible forming of three-dimensional surface parts using bendable rollers

Hu, Zhiqing; Li, M.Z.; Cai, Zhongyi; Gong, Xue

doi:10.1016/j.msea.2007.11.107

Cited by 38 publications

(9 citation statements)

References 6 publications

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“…In Figure. The thickness of the pipe makes the contact point D i inside the pipe wall and the contact points B i and C i outside the pipe wall, so the coordinates of the corresponding points can be calculated as the Eq.s (4) - (6).…”

Section: Determination Of Position Parameters For the Rollersmentioning

confidence: 99%

Adjustment of Rollers in the Flexible Roll Forming Unit for the Production of Different Types of Straight Pipes

Ding¹,

Sun²,

Peng³

et al. 2017

dtetr

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Abstract. The flexible roll process forms the pipes with different dimensions from the continuous strips or coils by changing only a few rollers or even without changing any roller. To further improve the productivity, this paper presents an adjusting technique which uses the excessive bending effect in the three-point flexible forming to modify roller patterns. The modified roller patterns are then used to calculate the position and angle for each passing roller in the rough forming part. Finally, the positions and angles of the rollers are assigned to position parameters of the rollers in the flexible roll forming unit, especially when the unit is beginning to form and weld a pipe with a new specification. An experiment of the production of straight pipes with different dimensions by the unit validates the feasibility of this technique.

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Section: Determination Of Position Parameters For the Rollersmentioning

confidence: 99%

Adjustment of Rollers in the Flexible Roll Forming Unit for the Production of Different Types of Straight Pipes

Ding¹,

Sun²,

Peng³

et al. 2017

dtetr

View full text Add to dashboard Cite

show abstract

“…Kari [6] proved that UHS steel can be bent by flexible roll forming process through experimental research. And flexible roll forming technology has also been widely used in the manufacture of automotive component, hull structure, and three-dimensional surface parts [7][8][9]. Nakata Flexible forming excellent (FFX) forming is an advanced flexible roll forming technology [10,11].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Five‐Point Bending and Springback for Preforming Process of ERW Pipe FFX Forming

Liu

et al. 2019

Mathematical Problems in Engineering

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Flexible forming excellent (FFX) forming of electric resistance welding (ERW) pipe is an advanced roll forming method. In order to understand FFX forming mechanism and set reasonable roll parameters, five-point bending process and springback process for preforming section of ERW pipe FFX forming are analyzed. Under various assumptions, the bending process of sheet metal is divided into full elastic bending stage and elastic-plastic bending stage by analyzing the forming law and simplifying the contact state model of roll bending process. Based on the theory of plane bending theory, the five-point bending springback model is established. Mathematical expressions of bending curvature and rotation angle of arbitrary particle on plate under arbitrary state are derived. The curvature calculation formulas of each particle on plate after springback are obtained, and then the calculation formulas of bending angle and rebound angle after springback are obtained. The theoretical analysis results are verified by the wide plate five-point bending experiment. The theoretical value of springback angle agrees well with the experimental results. The maximum deviation of springback angle is 0.42 degrees. The results show that the five-point bending model is reasonable. It provides theoretical support for the preforming model of flexible roll forming.

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“…proposed line array roll set process (LARS) using multiple roll sets as a forming tool, the whole deformation of the LARS part is generated after only one pass [3,4] . Li et al explored continuous flexible forming (CFF) to realize 3D curve surface sheet forming [5][6][7][8] . The system of the continuous flexible forming is composed of an upper and two lower bendable rolls, and the bendable rolls can be bent by the control units.…”

Section: Introductionmentioning

confidence: 99%

Deformation Characteristics of the Sheet Metal in the Roll Gap for the Continuous Roll Forming Process

Wang

Yang

2018

MSF

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Continuous Roll Forming process (CRFP) is a newly developed technique applied to form 3D surface part with various transverse and longitudinal curvatures. In CRFP, the sheet metal is non-uniformly compressed in the roll gap between the upper and lower bendable rolls. The two bendable rolls rotate in opposite directions, and the sheet metal is bitten into the roll gap continuously. At the present, the deformation characteristics of the sheet metal in the deformation zoon (sheet metal between the upper and lower bendable roll) is discussed. The friction force in CRFP can be calculated according to the Coulomb friction law.

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Continuous flexible forming of three-dimensional surface parts using bendable rollers

Cited by 38 publications

References 6 publications

Adjustment of Rollers in the Flexible Roll Forming Unit for the Production of Different Types of Straight Pipes

Adjustment of Rollers in the Flexible Roll Forming Unit for the Production of Different Types of Straight Pipes

Theoretical Analysis of Five‐Point Bending and Springback for Preforming Process of ERW Pipe FFX Forming

Deformation Characteristics of the Sheet Metal in the Roll Gap for the Continuous Roll Forming Process

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