Bending Parameters in Heat Assisted Air Bending of High Strength Steels

Vorkov, Vitalii; García, Alberto Tomás; Duflou, Joost R.

doi:10.1016/j.promfg.2020.04.250

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…With the continuation of plastic deformation, the material hardening rate decreases slowly in a small range. For the 304 stainless (1)…”

Section: Flexible Hardening Model For Sheet Metalmentioning

confidence: 99%

“…:107 (1) In this new control system, novel prediction models are establish to ensure the applicability in diverse materials. The springback analytical model is built and incorporated the variable modulus function, a sequential identification strategy is proposed to search nominal material properties using the four sub-optimization models.…”

Section: Competing Interestsmentioning

confidence: 99%

“…Owing to flexibility of the air bending process [1], it is widely used in the bending of sheets, pipes, and profiles [2][3][4]. This approach can be used to form multi-shaped parts by controlling the punch stroke [5], and many scholars have proposed automatic control methods [6].…”

Section: Introductionmentioning

confidence: 99%

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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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“…With the continuation of plastic deformation, the material hardening rate decreases slowly in a small range. For the 304 stainless (1)…”

Section: Flexible Hardening Model For Sheet Metalmentioning

confidence: 99%

Section: Competing Interestsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…It has been observed that the rate of ferrite in the material increases with the increase in temperature in locally applied heat treatments when various studies in the literature are examined. In this way, it has been observed that the amount of springback could be reduced and the formability feature could be increased [6][7][8][9][10][11][12][13][14][15][16][17][18]. During the forming of high-strength sheet metal materials at room temperature, dimensional forming errors which are called springback may also occur in addition to difficulties such as crack formation and breakage.…”

Section: Introductionmentioning

confidence: 99%

The effects of laser-assisted heat treatment on warm formability of dual-phase materials

Karaağaç

Kabakçi

Başdoğan³

2023

Ironmaking & Steelmaking

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In this study, the effects of local heat treatment using a low-power laser on the bending formability of DP800 sheet material were experimentally investigated. In the first step of the study, only the punch contact bending region of sheet metal was locally heated with a constant feed rate (1 mm s −1 ) and at different laser powers (50, 75, and 100% Watt). In the next step, the sheet material was transferred to the bending die for bending without any cooling process, and into the last stage, the sheet material was formed in different angled V-bending dies (30°, 60°, and 90°). It was observed that in heating up to 75-W power, the hardness decreased to 237 HV due to the dissolution of the martensite in the microstructure of DP material, and the springback value decreased by 39.285% due to the decrease in hardness.

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