Development of an analytical 3D-simulation model of the levelling process

Behrens, Bernd‐Arno; Nadi, T. El; Krimm, Richard

doi:10.1016/j.jmatprotec.2011.01.007

Cited by 33 publications

(11 citation statements)

References 3 publications

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“…The law of each layer element is the same, thus, it is only necessary to analyze the stress of the layered element. The layered element will be used to deal with many necessary mathematical or physical problems, 20,21 as shown in Figure 2.…”

Section: Layered Theory Of Metalmentioning

confidence: 99%

Study on neutral layer offset of high-strength steel plate straightening of excavator’s working arm

Fan

Zhang

Jiang³

et al. 2017

Advances in Mechanical Engineering

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The steel plate straightening quality has an important influence on the welding quality and service performance of excavator's boom and arm. In this study, a stress neutral layer offset model was established based on three-point bending theory, steel plate bending characteristics, and layered theory in the straightening process. The stress neutral layer offset phenomenon and the relationship among the reverse bending radius, the plate thickness, and the metal deformation capacity have been proved theoretically. Combined with the tensile and bending tests at room temperature, the relationship between the neutral layer offset values and the reverse bending radius was obtained, and the results showed that the stress neutral layer offset value increases with the decrease in the reverse bending radius. The neutral layer offset phenomenon was also verified by the straightening experiment, and the flatness of the straightened high-strength steel plates is less than 1 mm/m.

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Section: Layered Theory Of Metalmentioning

confidence: 99%

Study on neutral layer offset of high-strength steel plate straightening of excavator’s working arm

Fan

Zhang

Jiang³

et al. 2017

Advances in Mechanical Engineering

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“…Alternatively, several works propose analytical models with simplifying assumptions that are based on fundamental equations allowing for a fast calculation [14]. The high sensitivity of the roller levelling process makes an accurate positioning of the rolls in the range of micrometres necessary [15]. As analytical models always are a compromise between computational time and accuracy, it is unavoidable to use FE simulations when looking for most accurate results [16].…”

Section: State Of the Artmentioning

confidence: 99%

Numerical Investigation of a Process Control for the Roller Levelling Process Based on a Force Measurement

Grüber

2016

MSF

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When processing conventional semi-finished metal strips, distinctive changes in the material properties along the strip length are unavoidable. The roller levelling process is sensitive to changes of those strip characteristics. Thus, a process control allowing for an online adaption of the roller levelling machine according to the actual strip characteristics is highly desirable. In order to enable a precise process layout, the calculation by the Finite Element Method (FEM) provides a suited strategy. Furthermore, the coupling of user-subroutines to an FE code offers the possibility to implement and test respective control strategies. This work proposes a control strategy that is based on a force measurement in the first load triangle of a levelling machine. A first FE model including a feedback control is used to calculate the dependence between the force in the first load triangle and the roll intermesh in the last load triangle leading to a flat sheet. The results are transferred to meta models – so called control curves – that give a direct relationship between the measured force and the roll intermesh. Within a second FE setup a feed-forward control based on these control curves is implemented and the proposed control strategy is investigated for varying yield strengths along the strip length. Thus, the time consuming FE simulations that are necessary to obtain the control curves are decoupled from the actual levelling process. According to the obtained results, the introduced approach is able to improve the sheet flatness for thin sheets when a change in the material properties occurs.

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“…These numerical investigations are used to identify a suitable set up of the straightening roll infeed and the state of stress within the material [5][6][7][8]. But not only numerical calculations are expedient, analytical models can help as well to provide information concerning the infeed of the straightening rolls, as shown in [9][10][11][12]. [13] shows the impact that the different adjustable machine rolls have, and demonstrates that the second adjustable roll of the often used seven roll straightening machine has the most impact on curvature, and, consequently, the straightening process.…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

Innovative Measurement Of Stress Superposed Steel Strip For Straightening Machines

Bader¹,

Bathelt²,

Djakow³

et al. 2021

Esaform 2021

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Higher quality requirements by customers demand higher precision and accuracy from manufacturing processes. Application oriented preparation of semi-finished materials is key for subsequent forming operations, therefore, straightening machines are employed. Straightening strengthens the material by increasing plastic deformation by means of strain hardening, resulting in undesirable reduction in formability when processing high strength materials, in particular. Conventional roll-type straightening machines process either bars or strips. This is achieved upon passing material between rolls arranged in two staggered rows. However, conventional straightening processes do not adapt to the local varying distortion of coiled strips. Innovative, self-correcting process control techniques, which adapt to the initial geometric characteristics of the strip, present a promising approach to fix this issue through optimization of the leveling process. Here, an innovative strategy to improve straightening of high strength steel materials (1.4310) is presented. This implements optimized leveling, adding minimal plastic deformation and, thus, strain hardening. To operate an intelligent straightening machine, a reliable online measurement of the surface defects is fundamentally essential. The MagnaTest, which is developed for material testing, is made feasible for such purposes after calibrating for curvature measurement. Preliminary results are promising in regards to measuring the curvature online, so that the following straightening process can be close loop controlled. The bending measurement is linked to open/closed loop control, therefore providing an optimal straightening result in regards to formability, leveling, and reduced strain hardening.

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Development of an analytical 3D-simulation model of the levelling process

Cited by 33 publications

References 3 publications

Study on neutral layer offset of high-strength steel plate straightening of excavator’s working arm

Study on neutral layer offset of high-strength steel plate straightening of excavator’s working arm

Numerical Investigation of a Process Control for the Roller Levelling Process Based on a Force Measurement

Innovative Measurement Of Stress Superposed Steel Strip For Straightening Machines

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