Experimental simulation of strip edge cracking in steel rolling sequences

Hubert, Cédric; Dubar, Laurent; Dubar, Mirentxu; Dubois, A.

doi:10.1016/j.jmatprotec.2010.05.006

Cited by 21 publications

(7 citation statements)

References 13 publications

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“…Large shear stresses may increase the risk for mode II fractures (a shear stress acting perpendicular to the crack front) on the edge. Hubert et al (2010) concludes that edge cracks in combination with a rolling operation is a problem, especially for soft materials. According to the results of the simulations shown in figures 10 and 11, the force components F zone 1 x and F zone 2 x were larger for the one clamped case compared with two clamped case except for the first 0.5 mm and possibly the last 0.5 mm in the simulations.…”

Section: Discussionmentioning

confidence: 99%

Experimental study on the effects of clearance and clamping in steel sheet metal shearing

Gustafsson

Oldenburg

Jansson

2016

Journal of Materials Processing Technology

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Experimental study on the effects of clearance and clamping in steel sheet metal shearing. Abstract Shear cutting is common within several sheet metal industry processing steps, e.g. in cut to length lines, slitting lines, end cropping. Shearing is fast and cheap relative to competing cutting methods like laser and plasma cutting, but involves large forces on the equipment that increase with increased sheet material strength. Accurate shear experiments are a prerequisite to increase the knowledge of shearing parameters, improve industrial shearing, and provide data for validation of numerical shear models. Here, the two shear parameters clearance and clamp configuration, identified as important to the shear results, were studied in an experimental set-up with well defined tool movement and high measurability of tool position and force. In addition to force measurements, the sheared edge geometry was characterized. Steels of low, medium, and high strength were selected for the study. Throughout the experimental study, the shear tool penetration before fracture decreased with increased material strength. The required shear force decreased and the force attempting to separate the two shear tools increased when one side of the sheet was left unclamped and free to move. Further, the maximum shear force increased with decreased clearance. Clearance changes were small and moreover continuously measured during all shear experiments. Journal of Materials Processing

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Section: Discussionmentioning

confidence: 99%

Experimental study on the effects of clearance and clamping in steel sheet metal shearing

Gustafsson

Oldenburg

Jansson

2016

Journal of Materials Processing Technology

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“…The paper in [7] also discusses the effect of trimming clearance on the cut edge formation. Hubert et al [8] used numerical modeling to analyze the rolling and edge trimming process. As a result of the analyses, it was possible to forecast stress fields in the cut edge.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis and Experimental Investigation of Cut Surface Formation of Magnetic Silicon Steel in Shear Cutting

2021

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Shear cutting allows for shaping materials with any length of cutting line with high efficiency and without negative thermal effects, but it causes stresses and deformations in the cutting zone of the material. This has a negative effect on the magnetic properties of the sheet in the areas of the cut edge. The main problem on production lines is to ensure appropriate control of the process so as to obtain the appropriate technological quality of the cut edge, free of not only defects in the form of burrs and shape deviations, but also the minimum deformed zone. This task is difficult due to the large number of control variables, the influence of which on the shaping of the material and the formation of the cut edge is not fully understood. The article attempts to determine the course of the cutting process and to examine the influence of control variables on the formation of the cut edge in the shear-slitting process in which the tools perform a rotary motion. For this purpose, FEM modeling, vision techniques and experimental studies were used. A 3D model of the process was developed, which enables a detailed analysis of the states of stresses, strains, displacements and fracture mechanisms of the material. The simulation results were verified using vision techniques, which were used in the work to observe the flow and cracking mechanisms of the material. Parametric analyses were performed for the process control variables. The research showed a significant influence of the cutting velocity and the clearance between the tools on the formation of the cut edge. The most homogeneous surface of the cut edge with the minimum burr height was obtained for the following parameters: rake angle α = 15–30°, horizontal clearance hc = 0.03 mm and slitting velocity v2 = 15 m/min. The developed results can be useful for controlling the cutting process on production lines in terms of maximum process efficiency while maintaining the appropriate technological quality of the cut edge.

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“…Unfortunately, it is difficult to control the quality of the cut off part’s sheared edge. Hubert et al [ 30 ] analyzed stress fields in the sheet metal cut edge due to the edge trimming process by two rotary knives and revealed during the cold rolling process. For the purposes of modelling the edge trimming phases, the FEA was used.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Analysis of Shear-Slitting of AA6111-T4 Aluminum Alloy Sheet

et al. 2020

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This work presents experimental studies with numerical modeling, aiming at the development of guidelines for shaping aluminum alloy AA6111-T4, t = 1.5 mm thick, with the use of a shear-slitting operation. During the experimental tests, parametric analyses were conducted for the selected material thickness. For the purposes of the material deformation’s analysis, a vision system based on the digital image correlation (DiC) method was used. Numerical models were developed with the use of finite element analysis (FEA) and the mesh-free method: smoothed particle hydrodynamics (SPH), which were used to analyze the residual stress and strain in the cutting zone at different process conditions. The results indicate a significant effect of the horizontal clearance between knives on the width of the deformation zone on sheet cut edge. Together with the clearance value increase, the deformation zone increases. The highest burrs on the cut edge were obtained, when the slitting speed was set to v = 17 m/min, and clearance to hc = 6%t. A strong influence was observed of the horizontal clearance value at high slitting speeds on burr unshapeliness. The most favorable conditions were obtained for v = 32 m/min, hc = 0.062 mm, and rake angle of upper knife for α = 30°. For this configuration, a smooth sheared edge with minimal burr height was obtained.

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Experimental simulation of strip edge cracking in steel rolling sequences

Cited by 21 publications

References 13 publications

Experimental study on the effects of clearance and clamping in steel sheet metal shearing

Experimental study on the effects of clearance and clamping in steel sheet metal shearing

Finite Element Analysis and Experimental Investigation of Cut Surface Formation of Magnetic Silicon Steel in Shear Cutting

Modeling and Experimental Analysis of Shear-Slitting of AA6111-T4 Aluminum Alloy Sheet

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