An Experimental Analysis Device for Obtaining Skid Line Limit Diagrams

Wanintradul, Chatchai; Gurumurthy, Gopinath T.; Smith, L. M.; Du, Changqing; Geng, Lumin; Zhou, Dajun; Hsiung, Ching-Kuo; Chen, Jizhou; Cao, Feng

doi:10.1063/1.3623657

Cited by 9 publications

(10 citation statements)

References 8 publications

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“…It clearly shows that the skid line only occurs within a certain load range. The much larger area of the SLLD marks a kink [14]. Wanintradul et al [14] therefore divide the resulting surface defects into two categories: kink and skid line.…”

Section: /1mentioning

confidence: 99%

“…The much larger area of the SLLD marks a kink [14]. Wanintradul et al [14] therefore divide the resulting surface defects into two categories: kink and skid line. Thereby, the local curvature of both sides of the sheet appear equivalent in case of a kink, whereas skid lines do not show the same curvature on both sides (Fig.…”

Section: /1mentioning

confidence: 99%

“…Therefore, thinning is used for predicting skid lines in the FE simulation in [3]. [14] am (SLLD), (b) comparison of the kink and (c) the skid line [14] Skid lines are often unavoidable for interior or structural components of vehicle bodies, but do not cause visible surface defects relevant to quality and therefore do not lead to scrap. However, if such surface defects arise on the outside of outer skin parts, in many cases this may lead to scrap.…”

Section: /1mentioning

confidence: 99%

“…Kink and skid line. (a) Skid Line Limit Diagr (a) Skid Line Limit Diagram (SLLD), (b) comparison of the kink and (c) the skid line[14] am (SLLD), (b) comparison of the kink and (c) the skid line[14]…”

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confidence: 99%

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Prediction and assessment of skid line formation during deep drawing of sheet metal components by using FEM simulation

Cyron¹,

Liewald²,

Riedmüller³

et al. 2021

Esaform 2021

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The subjective perception of the quality of sheet metal components mainly depends on geometric characteristics and surface structure. Additionally, particular attention must be paid in this context to avoiding surface defects such as skid lines during the sheet metal forming process. For this reason, current research activities focus on predicting such surface defects as precisely as possible in the early development stages of sheet metal components by using FEM simulation. However, the modelling approaches available today do not yet provide an adequate basis for such a numerical prediction regarding the appearance of surface defects of sheet metal components such as car body outer skin panels, especially of skid lines. Consequently, the research work reported about in this paper concentrates on the development of an empirical methodology for predicting and quantifying the formation of skid lines during deep-drawing processes by using FEM simulation. For this purpose, an experimental tool was developed to produce different skid line formations by using various process parameters and thus to investigate process-influencing factors on the example of the steel sheet material DC06. In principle, the investigations carried out showed that the punch radius and the blank holder force indeed do represent crucial influencing factors for the formation of skid lines. Finally, the results obtained were used to develop a forming simulation criterion, which allows predicting skid lines formations based on calculated strain state variables such as major strain, thinning and unbending strain.

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Section: /1mentioning

confidence: 99%

Section: /1mentioning

confidence: 99%

Section: /1mentioning

confidence: 99%

mentioning

confidence: 99%

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Prediction and assessment of skid line formation during deep drawing of sheet metal components by using FEM simulation

Cyron¹,

Liewald²,

Riedmüller³

et al. 2021

Esaform 2021

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“…Choe and Chung [3] studied the geometric measurement and analysis of a section pro le. Wanintradul et al [12] developed a new experimental method to investigate the occurrence of skid lines during the stamping process. Thipprakmas and Sontamino [13] studied the effects of a coined-bead die on the spring-back characteristics during V-die bending.…”

Section: Introductionmentioning

confidence: 99%

Effects of the material properties and thickness on the minimum formable radius in the subtle feature forming process

Chung¹,

Yu²,

Jung³

et al. 2022

Preprint

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The subtle feature geometry, also called a feature line, is considered an important geometric characteristic of automotive outer panels. The influences of material properties and thickness on the radius of curvature of subtle features were investigated in this study. First, the stamping process was simplified to a combined forming process between tensile and bending deformation. Subsequently, test materials, namely, 180B2, 210B2, CR2, CR3, and CR4, with various thickness values were adopted in the finite element analysis and experiments. In addition, the radius of curvature with respect to the material, thickness, punch radius, and punch angle was studied. The simulation results were compared with the experimental results for verification. From this comparison, it was found that the simulation results were in good agreement with the experimental data. Finally, the forming characteristics of the subtle feature-forming process were investigated to determine the effects of the material properties and thickness on the radius of curvature. The reason for the minimum formable radius when the radius of the punch was zero was studied. The results showed that, as the material thickness increased, more concentrated deformation occurred in the central region. In contrast, the radius of curvature of the subtle features increased as the thickness of the central region decreased. Similarly, decreased n-value results were identified for the same reason as the increased radius of curvature.

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The Minimum Formable Radius of Subtle Feature Lines in Automotive Outer Panel Stamping

Lee

Youn

et al. 2021

Int.J Automot. Technol.

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An Experimental Analysis Device for Obtaining Skid Line Limit Diagrams

Cited by 9 publications

References 8 publications

Prediction and assessment of skid line formation during deep drawing of sheet metal components by using FEM simulation

Prediction and assessment of skid line formation during deep drawing of sheet metal components by using FEM simulation

Effects of the material properties and thickness on the minimum formable radius in the subtle feature forming process

The Minimum Formable Radius of Subtle Feature Lines in Automotive Outer Panel Stamping

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