Springback Analysis of Flexible Stretch Bending of Multi-Point Roller Dies Process for Y-Profile under Different Process Parameters

Chen, Chuandong; Liang, Jicai; Li, Yang; Jin, Wenming

doi:10.3390/met11040646

Cited by 4 publications

(2 citation statements)

References 20 publications

(21 reference statements)

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“…These assumptions and other unmodeled residuals cause deviations of prediction results [5]. Thus, many scholars have built models based on online data to predict bending process parameters [19]. Online data can include online interference, some is non-measurable, such as changes in lubrication conditions, tool wear, and equipment temperature rise, these can cause poor product consistency [20].…”

Section: Introductionmentioning

confidence: 99%

Precision and Flexible Bending Control Strategy Based on Analytical Models and Data Models

Duan

Tian

Zhang

et al. 2022

Chin. J. Mech. Eng.

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Forming of various customized bending parts, small batches, as well as numerous types of materials is a new challenges for Industry 4.0, the current control strategies can not meet the precision and flexibility requirement, expected control strategy of bending processes need to not only resist unknown interferences of process condition and models, but also produce various new parts automatically and efficiently. In this paper, a precision and flexible bending control strategy based on analytical models and data models is proposed to build adaptive bending systems. New analytical prediction models for loading and unloading are established and suitable for various materials, a sequential identification strategy is proposed to search nominal properties using the four sub-optimization models. A data-based feedback model is established to prevent over-bending and eliminate online deviation. Above models are merged into a precision and flexible control strategy. The system firstly uses sub-optimization models to search the nominal point which is near to target point, secondly the system further uses feedback model to eliminate residual error between the nominal point and target point. Compared with four kinds sheet metals, the allowable ranges for variables are determined for a good convergence. The target bending angles were set to 20°, 40°, and 60°. Forty parts were tracked for each kind material, the adaptive bending system converged after one iteration, and exhibited better performances.

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Section: Introductionmentioning

confidence: 99%

Precision and Flexible Bending Control Strategy Based on Analytical Models and Data Models

Duan

Tian

Zhang

et al. 2022

Chin. J. Mech. Eng.

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show abstract

“…Liang et al [8] studied the influence of the bending angle of multi-point stretch-bend on the section deformation of the parts by using the ABAQUS finite element analysis method and predicted the forming quality control curve by the support vector regression method. Chen et al [9] analyzed the spring-back of multi-point flexible stretch-bend forming of Y-section profiles under different process parameters. The effects of process parameters such as horizontal bending radius, vertical bending radius, transition length, rolling mold radius, and wall thickness of the profile on spring-back deviation were discussed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Contact Interface Friction on Plastic Deformation of Stretch-Bend Forming

Zhang

et al. 2022

Coatings

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The contact interface friction between the specimen and the mold during the stretch-bend is a complex interactive process. Friction causes the uneven distribution of tensile stress on the specimen, which affects the plastic flow of the forming material and the spring-back after forming. In this paper, the analytical model of frictional shear stress and tensile stress distribution in the contact mold segment of the stretch and bend synchronous loading stage was established. The influence law of friction coefficient and contact mold angle on the stress–strain distribution of the specimen contact mold segment was discussed. The effect of key factors affecting the friction state of the contact interface (mold surface roughness and contact mold angle) on the shrinkage deformation of the cross-section and the tensile deformation gradient of the specimen was analyzed by equivalent stretch-bend forming experiments. The results showed that the smaller the surface roughness of the mold was, the better the friction state of the contact interface was, the plastic deformation of the specimen was more uniform, and the difference between the section shrinkage and elongation of the contact mold segment and the suspension segment was smaller. Reducing the contact mold angle of the stretch-bend can bring down the tensile stress difference at both ends of the contact mold segment of the specimen so that the section shrinkage and tensile elongation of the contact mold segment and the suspension segment tend to be consistent.

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Analytical springback assessment and compensation in 3D multi-point flexible stretch bending forming

Liang,

Luo,

Liang

et al. 2023

Int J Adv Manuf Technol

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Springback Analysis of Flexible Stretch Bending of Multi-Point Roller Dies Process for Y-Profile under Different Process Parameters

Cited by 4 publications

References 20 publications

Precision and Flexible Bending Control Strategy Based on Analytical Models and Data Models

Precision and Flexible Bending Control Strategy Based on Analytical Models and Data Models

Influence of Contact Interface Friction on Plastic Deformation of Stretch-Bend Forming

Analytical springback assessment and compensation in 3D multi-point flexible stretch bending forming

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