On the influence of deformation of deep drawing quality steel sheet on surface topography and friction

Trzepieciński, Tomasz; Fejkiel, Romuald

doi:10.1016/j.triboint.2017.05.007

Cited by 48 publications

(80 citation statements)

References 38 publications

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“…However, the COF was very stable during the tests realized in all friction conditions. This conclusion is in contrast to the recent investigations of authors [2,3] on the friction determination in a strip drawing test when the nonlinear relation between friction and normal force was found.…”

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confidence: 99%

“…In the case of high surface roughness, the load pressure acts on the asperities, which results in a higher degree of surface flattening and increased frictional resistance [1]. The share between these phenomena in the total frictional resistance is particularly important in the conditions of sheet lubrication in SMF [2]. The lowest values of the coefficient of friction were recorded during tests using a roll with a roughness Ra = 0.32 µm (Figure 6a).…”

Section: Effect Of Surface Roughness Of Toolsmentioning

confidence: 99%

“…Under these conditions, frictional resistances resulting from interactions between the peaks of cooperating asperities were the smallest. At the same time, the volume of "oil pockets" [2] between contacting surface asperities was large enough to provide an adequate reservoir of lubricant at the contact area.…”

Section: Effect Of Surface Roughness Of Toolsmentioning

confidence: 99%

“…The presence of friction in sheet metal forming (SMF) processes is generally an unfavorable phenomenon and causes changes in the force and energy parameters: the total work and power needed for the process increases, which also causes the forces and unit pressures on the tool surfaces to increase. In a stamping tool, frictional resistance is an important process parameter that controls the material flow in the tool and the surface finish of produced parts [1,2]. At high pressures, the occurrence of material adhesion to the tool and the formation of accretions affect the quality of the product surface [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach

Trzepieciński

Lemu

2020

Metals

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This paper is aimed to determine the value of coefficient of friction (COF) at the rounded edge of the die in the sheet metal forming operations using the bending under tension (BUT) test. The experimental part of the investigations is devoted to the study of the frictional resistances of low alloy steel sheet under different strains of the specimen, surface roughnesses of the tool and for different lubrication conditions. Three oils are destined for different conditions of duties in the stamping process. Numerical modeling of the material flow in the BUT test has been conducted in the MSC.Marc program. One of the objectives of the numerical computations is to know the type of the contact pressure acting on the cylindrical surface countersample in the BUT test by assuming the anisotropic properties of the metallic sheet. It has been found that the COF in the rounded edge of the die does not vary with increasing sheet elongation. Taking into account that normal pressure increases with increasing specimen elongation and workpiece material is subjected to strain hardening phenomenon, the COF value is very stable during the friction test. The effectiveness of the lubrication depends on the balance between two mechanisms accompanied by friction process: roughening of workpiece asperities and adhesion of the contacting surfaces. In the case of high surface roughness of tool due to a dominant share of ploughing, all of the lubricants used were not able to decrease the COF in a sufficient extent. The used lubricants were able to reduce the value of friction coefficient approximately by 3–52% in relation to the surface roughness of rolls.

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confidence: 99%

Section: Effect Of Surface Roughness Of Toolsmentioning

confidence: 99%

Section: Effect Of Surface Roughness Of Toolsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach

Trzepieciński

Lemu

2020

Metals

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“…The unfavorable effects of frictional resistance include [15,16]: non-uniform workpiece deformation, worsening of workpiece surface roughness, and the increased tool wear. The existence of frictional resistance between workpiece and punch in the stamping process has an advantage that the maximum allowable drawing force can be increased.…”

Section: Frictional Resistancementioning

confidence: 99%

Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming

Trzepieciński

Lemu

2019

Metals

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Friction is the main phenomenon that has a huge influence on the flow behavior of deformed material in sheet metal forming operations. Sheet metal forming methods are one of the most popular processes of obtaining finished products, especially in aerospace, automobile, and defense industries. Methods of sheet forming are carried out at different temperatures. So, it requires tribological tests that suitably represent the contact phenomena related to the temperature. The knowledge of the friction properties of the sheet is required for the proper design of the conditions of manufacturing processes and tools. This paper summarizes the methods used to describe friction conditions in conventional sheet metal forming and incremental sheet forming that have been developed over a period of time. The following databases have been searched: WebofKowledge, Scopus, Baztool, Bielefield Academic Search Engine, DOAJ Directory of Open Access Journals, eLibrary.ru, FreeFullPdf, GoogleScholar, INGENTA, Polish Scientific Journals Database, ScienceDirect, Springer, WorldCat, WorldWideScience. The English language is selected as the main source of review. However, in a limited scope, databases in Polish and Russian languages are also used. Many methods of friction testing for tribological studies are selected and presented. Some of the methods are observed to have a huge potential in characterizing frictional resistance. The application of these methods and main results have also been provided. Parameters affecting the frictional phenomena and the role of friction have also been explained. The main disadvantages and limitations of the methods of modeling the friction phenomena in specific areas of material to be formed have been discussed. The main findings are as follows—The tribological tests can be classified into direct and indirect measurement tests of the coefficient of friction (COF). In indirect methods of determination, the COF is determined based on measuring other physical quantities. The disadvantage of this type of methods is that they allow the determination of the average COF values, but they do not allow measuring and determining the real friction resistance. In metal forming operations, there exist high local pressures that intensify the effects of adhesion and plowing in the friction resistance. In such conditions, due to the plastic deformation of the material tested, the usage of the formula for the determination of the COF based on the Coulomb friction model is limited. The applicability of the Coulomb friction model to determine the COF is also very limited in the description of contact phenomena in hot SMF due to the high shear of adhesion in total contact resistance.

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Advance on friction of stamping forming

Gui

Long

Yang

et al. 2018

Int J Adv Manuf Technol

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On the influence of deformation of deep drawing quality steel sheet on surface topography and friction

Cited by 48 publications

References 38 publications

Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach

Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach

Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming

Advance on friction of stamping forming

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