A study on variable friction model in sheet metal forming with advanced high strength steels

Wang, Wurong; Zhao, Yuyuan; Wang, Zimin; Hua, Meng; Wei, Xicheng

doi:10.1016/j.triboint.2015.09.011

Cited by 62 publications

(41 citation statements)

References 22 publications

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“…These results match with those found in the aforementioned wear test conducted in a tribometer where adhesion, scar formation, material transfer and high wear rate were evidenced for the system that used 2HEAF as lubricant. Besides, wear tests showed high COF for 2HEAF, which can be related to friction shear stress 23 that could induce the fracture at an angle proximate to 45º (Figure 9-a) 57 . Tests with 2HEAPe and the commercial lubricant were successfully conducted until the end.…”

Section: Bending Under Tensionmentioning

confidence: 98%

“…From these results, it could be stated that the commercial lubricant was better lubricant than the 2HEAPe; however, it is not a guarantee for a good stamping process, where the control of friction is more important than minimizing or suppressing it 21,22 . COF values (Table 4) showed a predominant mixed lubrication regime 23 , since the COF values are less than 0.1 for both the studied lubricant fluids. The results obtained for 2HEAPe and for the commercial lubricant agree with those found in the ball-on-plate tests, where these lubricant fluids presented similar results regarding wear rates.…”

Section: Bending Under Tensionmentioning

confidence: 99%

“…Friction control is important to determine the deformation in stamping processes 21 and avoids wrinkling 22 , as well as in the level of residual stress and springback of the deformed pieces 23 . The lubrication regimes more found in metal forming are generally boundary or mixed, depending on the applied load and the obtained coefficient of friction [21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

“…The lubrication regimes more found in metal forming are generally boundary or mixed, depending on the applied load and the obtained coefficient of friction [21][22][23] . As reported by other authors [17][18][19][20] , boundary lubrication can be achieved using ionic liquids, due to their elevated viscosity, which could give away interesting results for application in metal forming.…”

Section: Introductionmentioning

confidence: 99%

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Protic Ionic Liquids Used as Metal-Forming Green Lubricants for Aluminum: Effect of Anion Chain Length

et al. 2017

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Among the applications for protic ionic liquids (PILs), lubrication is one of the newest and the most promising. In this work, ammonium-based protic ionic liquids were tested as lubricant fluids for aluminum-steel contacts. PILs were synthesized with 2-hydroxyethylamine (2HEA) and a carboxylic acid (formic and pentanoic), aiming to understand the effect of two different anion chain lengths on the lubricant behavior. The synthesized PILs were characterized by RMN, FTIR and TGA. Wear tests, conducted using a ball-on-plate configuration, showed that the increase of the anion carbon chain length in the PIL structure reduced significantly the coefficient of friction value. Besides, after the wear tests, the PILs structural integrity was not affected. In the same way, bending under tension (BUT) tests evidenced that the performance for stamping conditions of the PIL with the longest anion carbon chain was similar to that of the commercial lubricant. Since, both formed a uniform tribofilm, developed the same lubrication regime and the drawing forces values were close and constant. Hence, the ionic liquid obtained with 2HEA and pentanoic acid (2HEAPe) is as suitable as the commercial lubricant for metal forming processes.

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Section: Bending Under Tensionmentioning

confidence: 98%

Section: Bending Under Tensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Protic Ionic Liquids Used as Metal-Forming Green Lubricants for Aluminum: Effect of Anion Chain Length

et al. 2017

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“…The main factors influencing the tribological phenomena in plastic working processes include macro-and microgeometry of contacts, the kinematics of the tool, physical and chemical phenomena at the contact surface and the temperature [1,4,5]. Physical and chemical phenomena occurring in the contact zone depend, among others things, on the materials of the frictional pair and the chemical affinity of the materials in contact.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of friction coefficient of an auto-body steel sheet

2016

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In this paper the results of strip drawing tests aimed to determine the friction coefficient in sheet metal forming operations are presented. The tests were conducted using a specially designed tribological simulator. The deep drawing quality steel sheet used in the automotive industry was tested. The relationship that shows the effect of sheet normal load, tool surface roughness, lubrication conditions and sample orientation according the rolling direction of the sheet on the value of friction coefficient are presented and discussed. The Scanning Electron Microscope (SEM) micrographs of sheet surfaces after the friction test allowed us to identify the mechanisms that occur at the contact of two bodies with rough surfaces. The results of the tests indicate that the relationship between friction force and normal force is nonlinear. Thus, the value of the friction coefficient is changed with the change of the load value.

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