Effect of variable friction coefficient on sheet metal drawing

Darendelıler, Haluk; Akkök, Metin; Yücesoy, Can A.

doi:10.1016/s0301-679x(01)00099-8

Cited by 36 publications

(17 citation statements)

References 20 publications

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“…In this respect, deep drawing process of a sheet metal is widely used in the automotive industry (Guillon et al, 2001;Wiklunda et al, 2004). Resistance to friction is one of the main factors limiting the sheet metal forming process (Darendeiler et al, 2002). Friction in sheet metal forming depends on several parameters such as the contact pressure, sliding velocity, sheet metal and tool surface roughness, tool and blank material, lubrication, etc.…”

Section: Introductionmentioning

confidence: 99%

Frictional characteristics of steel sheets used in automotive industry

Trzepieciński

Bazan

Lemu

2015

Int.J Automot. Technol.

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In this paper the results of experimental tests aimed to determine the friction coefficient in sheet metal forming operations for various sheet metal materials and at different operative conditions are presented. The research has considered the frictional characterization of three kinds of drawing quality steels that are commonly used in automotive industry. These are a drawing quality steel (DQ), a deep drawing quality steel (DDQ), and extra deep drawing quality steel (EDDQ). For measurement of the sheet surface topography, a 3D stylus instrument Alicona InfiniteFocus was used. To determine the friction coefficient three tribological tests, i.e. a strip drawing test, a draw bead test and a pin-on-disc tribometer, have been conducted. The experimental results have ascertained several relationships showing the effect of sheet metal surface roughness, lubricant conditions and sheet orientation on the value of friction coefficient in sheet metal forming processes. The results further showed that the surface topography and sample orientation in the rolling direction of the sheet are significant factors that influence the friction coefficient. It was found that the tested steel sheets, selected from automotive industry applications, exhibit anisotropic resistance to the friction corresponding to the measured orientation in relation to the rolling direction of the sheet.

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Section: Introductionmentioning

confidence: 99%

Frictional characteristics of steel sheets used in automotive industry

Trzepieciński

Bazan

Lemu

2015

Int.J Automot. Technol.

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“…The BUT test, however, requires specific equipment built for this purpose; there is no such device manufacturer. Other authors like Darendeliler et al [3] used the simulation program to evaluate the COF through simpler techniques, such as tribological tests only in the sheets, like the pin-on-disk test.…”

Section: Introductionmentioning

confidence: 99%

[ARTIGO RETRATADO] Effect of surface roughness and lubrication on the friction coefficient in deep drawing processes of aluminum alloy aa1100 with fem analysis 1

Folle¹,

Schaeffer

2019

Matéria (Rio J.)

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Friction between the interface workpiece and tooling has considerable importance in sheet metal forming operations; an accurate description of the friction is necessary to analyze and design new workpieces and tooling. This work suggests a methodology to determine and evaluate the mean coefficient of friction (COF) using the Finite Element Method (FEM) through Dynaform for the aluminum alloy AA1100. The results indicate that this methodology is consistent with reality. It is also observed that the software tends to diverge from the measured results because the software considers the COF to be constant along the process. Despite this trend, the greatest distance between the maximum drawing force given by the measurement and the numeric simulation was not high: it was approximately 6%. Workpiece strain measurements were collected to compare with the numerical simulation results, and it was observed that they are generally in agreement.

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“…[14,15] The lubrication conditions have been extensively studied by other researchers because they affect the forming loads and, consequently, modify the force balance which controls fracture. [16,17] Leu [4] showed that increasing the friction coefficient leads to higher maximum punch force but lower LDR. Among other studies, Kim et al [18] applied different types of lubricant for the stamping of AHSS and observed that the presence of an effective lubricant at the contact interfaces reduces the friction coefficient and increases the formability.…”

Section: Introductionmentioning

confidence: 99%

“…The lubrication conditions have been extensively studied by other researchers because they affect the forming loads and, consequently, modify the force balance which controls fracture . Leu showed that increasing the friction coefficient leads to higher maximum punch force but lower LDR.…”

Section: Introductionmentioning

confidence: 99%

Formability of AHSS under an Attach–Detach Forming Mode

Majidi

Barlat

Lee

et al. 2014

steel research int.

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In this work, a direct-drive digital servo-press functioning with a non-conventional punch displacement profile was used to enhance the drawability of DP780 and TR780 steel sheet samples. Cup drawing tests were conducted under multiple detachments between the tools and the partially deformed part. The experiments were conducted with a special die set-up that provides a decreasing blank holding force scheme during the test. The results were compared with those obtained with the same die set-up but with a more traditional V-type punch motion, which continuously keeps the contact between tool and work-piece. The percentage of successfully drawn cups and the depth of the fractured cups were considered to evaluate the performance of this approach. In addition, two sets of friction tests were conducted with a flat die on a specially designed testing machine. The friction coefficient was measured as a function of the normal contact pressure, which varies spatially and temporally during drawing. FE simulations were conducted in order to explain the differences in experimental results obtained using conventional and unconventional punch motions. In particular, the roles of a variable friction coefficient as well as that of springback after detachment of the tool from the blank were investigated. It was demonstrated that the combination of these two effects successfully explain the higher drawing performance achieved using the attach-detach mode.

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Effect of variable friction coefficient on sheet metal drawing

Cited by 36 publications

References 20 publications

Frictional characteristics of steel sheets used in automotive industry

Frictional characteristics of steel sheets used in automotive industry

[ARTIGO RETRATADO] Effect of surface roughness and lubrication on the friction coefficient in deep drawing processes of aluminum alloy aa1100 with fem analysis 1

Formability of AHSS under an Attach–Detach Forming Mode

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