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Strain Induced Surface Change in Sheet Metal Forming: Numerical Prediction, Influence on Friction and Tool Wear

Wu, Yutian ; Recklin, Viktor ; Groche, Peter (2022):
Strain Induced Surface Change in Sheet Metal Forming: Numerical Prediction, Influence on Friction and Tool Wear. (Publisher's Version)
In: Journal of Manufacturing and Materials Processing, 5 (2), MDPI, e-ISSN 2504-4494,
DOI: 10.26083/tuprints-00019588,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Strain Induced Surface Change in Sheet Metal Forming: Numerical Prediction, Influence on Friction and Tool Wear
Language: English
Abstract:

In sheet metal forming, free deformation of the sheet takes place frequently without contact with forming tools. The pre-straining resulting from the free deformation leads to a surface roughening of the sheet metal. It is assumed that the roughening has an influence on friction and wear behavior of the following forming process as well as the painting quality after the manufacturing. In this paper, a numerical prediction based on a polycrystalline model is first proposed to predict the effect of surface roughing based on the material data of the as-received state of the sheet metal. Different states of strain are analyzed and the numerical result is validated through experimental evaluation. Besides the numerical prediction, the friction behavior after pre-straining is evaluated in strip drawing tests and the coefficient of friction (COF) is calculated. For interpretation of the measured COF, the surface roughness after the friction test and the surface image are evaluated by a transparent toolset. It is shown that the surface transformation as a result of pre-straining has a negative influence on the lubricating effect of the sheet metal and degrades the friction behavior. Finally, the influence of the strain-induced surface roughening on wear is discussed based on wear testing in strip drawing test with draw bead geometry

Journal or Publication Title: Journal of Manufacturing and Materials Processing
Volume of the journal: 5
Issue Number: 2
Publisher: MDPI
Collation: 26 Seiten
Uncontrolled Keywords: strain, free deformation, surface roughening, FEM-simulation, strip drawing test, wear, friction, inline monitoring
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institute for Production Engineering and Forming Machines (PtU)
Date Deposited: 02 Feb 2022 13:21
Last Modified: 02 May 2022 12:07
DOI: 10.26083/tuprints-00019588
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-195888
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19588
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