Numerical simulation and experimental examination of forming defects in multi-point deep drawing process

Beglarzadeh, Babak; Davoodi, Behnam

doi:10.5755/j01.mech.22.3.15252

Cited by 8 publications

(1 citation statement)

References 12 publications

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“…Many researchers have tried to introduce the ideas of flexible forming and continuous forming into the traditional forming method [ 1 , 2 , 3 , 4 ], which not only achieves the application of one mold to manufacture 3D sheets with different shapes but also solves the problem that the size of the shaped part is limited by the mold size. Yamashita and Yamakawa [ 5 ] realized the double bending deformation of sheet metal with an entrance roll, exit rolls, and a pair of flexible rolls supported by bearings.…”

Section: Introductionmentioning

confidence: 99%

Shape Prediction of the Sheet in Continuous Roll Forming Based on the Analysis of Exit Velocity

et al. 2021

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Continuous roll forming (CRF) is a new technology that combines continuous forming and multi-point forming to produce three-dimensional (3D) curved surfaces. Compared with other methods, the equipment of CRF is very simple, including only a pair of bendable work rolls and the corresponding shape adjustment and support assembly. By controlling the bending shapes of the upper and lower rolls and the size of the roll gap during forming, double curvature surfaces with different shapes can be produced. In this paper, a simplified expression of the exit velocity of the sheet is provided, and the formulas for the calculation of the longitudinal curvature radius are further derived. The reason for the discrepancy between the actual and predicted values of the longitudinal radius is deeply discussed from the perspective of the distribution of the exit velocity. By using the response surface methodology, the effects of the maximum compression ratio, the sheet width, the sheet thickness, and the transverse curvature radius on the longitudinal curvature radius are analyzed. Meanwhile, the correction coefficients of the predicted formulas for the positive and negative Gaussian curvature surfaces are obtained as 1.138 and 0.905, respectively. The validity and practicability of the modified formulas are verified by numerical simulations and forming experiments.

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