Statistical Evaluation of the Influence of Temperature and Surface Roughness on Aluminium Sheet Metal Forming

Çavuşoğlu, Onur; Gürün, Hakan

doi:10.21278/tof.41305

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…They concluded that the height of the asperity decreased with increased local pressure, and this effect was much higher than the nominal pressure. Çavuşo glu and Gürün [23] investigated the surface roughness effect on the formation of the EN AW-3003-H111 sheets using the FE method. The surface roughness influenced the amount of sheet thinning (influence of 56%) in the process of stretching the sheet with a hemispherical punch.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Surface Topography Changes during Friction Testing in Cold Metal Forming of DC03 Steel Samples

Trzepieciński,

Szwajka,

Szewczyk

2023

Coatings

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Predicting changes in the surface roughness caused by friction allows the quality of the product and the suitability of the surface for final treatments of varnishing or painting to be assessed. The results of changes in the surface roughness of DC03 steel sheets after friction testing are presented in this paper. Strip drawing tests with a flat die and forced oil pressure lubrication were carried out. The experiments were conducted under various contact pressures and lubricant pressures, and lubrication was carried out using various oils intended for deep-drawing operations. Multilayer perceptrons (MLPs) were used to find relationships between friction process parameters and other parameters (Sa, Ssk and Sku). The following statistical measures of contact force were used as inputs in MLPs: the average value of contact force, standard deviation, kurtosis and skewness. Many analyses were carried out in order to find the best network. It was found that the lubricant pressure and lubricant viscosity most significantly affected the value of the roughness parameter, Sa, of the sheet metal after the friction process. Increasing the lubricant pressure reduced the average roughness parameter (Sa). In contrast, skewness (Ssk) increased with increasing lubrication pressure. The kurtosis (Sku) of the sheet surface after the friction process was the most affected by the value of contact force and lubricant pressure.

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Section: Introductionmentioning

confidence: 99%

Analysis of Surface Topography Changes during Friction Testing in Cold Metal Forming of DC03 Steel Samples

Trzepieciński,

Szwajka,

Szewczyk

2023

Coatings

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“…The formability of the material during the production varies according to deformation conditions and material properties. Under these conditions, it is known that the thinning amount, forming limit diagrams and forming force are effected in the stretch forming process while determining the formability of sheet metal materials 5 . In the literature, Figueiredo et al have determined that the surface roughness of the die plays an important role in the friction that is occurred in sheet metal forming processes 6 .…”

Section: Introductionmentioning

confidence: 99%

The Effects of Friction Coefficient on Formability Behaviour of Dual Phase Steel

Tekaüt

2019

Mat. Res.

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The effects of friction coefficient on formability behavior of advanced high-strength steel sheets have been examined in this study. For this purpose, forming analysis has been conducted by stretching the three different steel sheets such as DP600, DP800 and DP1000. Forming processes have been done by using punch that has different friction coefficients (0.05, 0.15, 0.3, 0.6 µ) in nakajima forming die. As a result of the analysis, it has been observed that thinning amount and forming force have increased by the increasing in the friction coefficient. When major and minor deformations on the sheet have been examined, it has been determined that the increasing friction coefficient makes plastic deformation amount increase.

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Analysis of the friction performance of deep-drawing steel sheets using network models

Najm,

Trzepieciński,

Ibrahim

et al. 2024

Int J Adv Manuf Technol

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This article presents the results of pilot studies on the lubrication of the blankholder zone in sheet metal forming using a pressurised lubricant. The authors invented a method and built a special tribometer for pressure-assisted lubrication. This approach reduces friction in sheet metal forming processes compared to conventional lubrication. Moreover, the artificial neural network approach combined with a force-directed Fruchterman-Reingold graph algorithm and Spearman’s correlation was used for the first time to analyse the relationships between the friction process parameters and the output parameters (the coefficient of friction and the resulting surface roughness of the sheet metal). The experimental tests were conducted utilising strip drawing on four grades of steel sheets known to be outstanding for deep-drawing quality. Different oils, oil pressures and contact pressures were used. Artificial neural network models were used for the first time to determine these relationships in a strip drawing test where every parameter is represented by one node, and all nodes are connected by edges with each other. R Software version 4.2.3 was used to construct the network using the ‘qgraph’ and ‘networktools’ packages. It was found that friction conditions had a highly significant negative correlation with coefficient of friction (COF) and a moderately significant negative correlation with the final surface roughness. However, the initial surface roughness of the as-received sheets had a negative correlation with the COF and a positive one with the resulting surface roughness of the sheet metal. The parameters most related to the COF are the strength coefficient, the ultimate tensile strength and the friction conditions (dry friction or pressurised lubrication). Spearman’s correlation coefficients showed a strong correlation between the kinematic viscosity and the friction conditions.

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Statistical Evaluation of the Influence of Temperature and Surface Roughness on Aluminium Sheet Metal Forming

Cited by 3 publications

References 12 publications

Analysis of Surface Topography Changes during Friction Testing in Cold Metal Forming of DC03 Steel Samples

Analysis of Surface Topography Changes during Friction Testing in Cold Metal Forming of DC03 Steel Samples

The Effects of Friction Coefficient on Formability Behaviour of Dual Phase Steel

Analysis of the friction performance of deep-drawing steel sheets using network models

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