0
Research Papers: Mixed and Boundary Lubrication

Effects of Rolling Direction and Lubricant on Friction in Sheet Metal Forming

[+] Author and Article Information
Xiaojun Liu1

School of Mechanical and Automotive Engineering, Hefei University of Technology, 230009 Hefei, China

Mathias Liewald, Dina Becker

Institute for Metal Forming Technology, Stuttgart University, 70174, Stuttgart, Germany

1

Corresponding author.

J. Tribol 131(4), 042101 (Sep 22, 2009) (8 pages) doi:10.1115/1.3201843 History: Received March 16, 2008; Revised June 28, 2009; Published September 22, 2009

Lubrication and friction at workpiece-tool interface play an important role in product quality control of sheet metal forming process. Surface microstructures of sheets have a great influence on the development of lubrication films. In order to investigate the effects of the rolling direction of aluminum alloy sheet and lubricant on the friction behavior in sheet metal forming, strip drawing test was used. The sample used was electric discharge texturing (EDT) surface. Lubricants, both with and without additives, were used. The strip drawing tests were performed at angles between the sliding and rolling directions of 0–90 deg. Variations in the sheet surface topography were analyzed by comparing the sheet surface microstructures and its 3D surface parameters before and after the strip drawing test. Results of the strip drawing tests indicate that the kind and amount of lubricant have great influences on friction at the interface, and the lubricant with additives benefits improving the friction behavior between the sheet and the tool. The EDT surface of the aluminum alloy sheet has an anisotropic frictional property during deep drawing process due to different angles between the sliding and rolling directions. When the sliding direction is parallel to the rolling direction, the coefficient of friction has the highest value. When the angle between the sliding and rolling directions increases, the coefficient of friction decreases. The surface microstructure of the sheets after the strip drawing test at different angles between the sliding and rolling directions has been modified, and its 3D surface parameters decrease significantly to a different degree.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 2

Mechanical properties of AA 6016 T4 (processed at 230°C)

Grahic Jump Location
Figure 3

Microscope image of AA6016 sheet, EDT surface (500×), and the angle between the sliding and rolling directions

Grahic Jump Location
Figure 4

Surface image of sample 1.2379 before the strip drawing test

Grahic Jump Location
Figure 5

The coefficient of friction tested with lubricants M75, KTLN-16, and CF12

Grahic Jump Location
Figure 6

The adhesion of the sheet; sheet material: AA6016 T4, sheet surface: EDT, tool material: 1.2379, lubricant: M75, amount: 0.5 g/m2, parallel to the rolling direction, normal pressure: 5 MPa, speed: 50 mm/s

Grahic Jump Location
Figure 7

Surface image of aluminum alloy sheet AA6016 T4, EDT surface before and after strip drawing test with different lubricants; tool material: 1.2379, parallel to the rolling direction, lubricant amount: 1.0 g/m2, pressure: 5 MPa, speed: 50 mm/s. (a) Before test with M75; (b) after test with M75; (c) before test with KTLN 16; (d) after test with KTLN 16; (e) before test with CF 12; and (f) after test with CF12.

Grahic Jump Location
Figure 8

Coefficient of friction over the angle between the sliding and rolling directions

Grahic Jump Location
Figure 9

The adhesion of the sheet; sheet material: AA6016 T4, sheet surface: EDT, tool material: 1.2379, lubricant: KTLN 16, amount of lubricant: 1.0 g/m2, angle between the sliding and rolling directions: 45 deg, normal pressure: 5 MPa, speed: 50 mm/s

Grahic Jump Location
Figure 10

Surface image of aluminum alloy sheet AA6016 T4, EDT surface before and after strip drawing test at different angles between the sliding and the rolling directions with lubricant M75 of 1.0 g/m2 under the normal pressure of 5 MPa and at the drawing speed of 50 mm/s. (a) Before test at the angle of 30 deg; (b) after test at the angle of 30 deg; (c) before test at the angle of 60 deg; (d) after test at the angle of 60 deg; (e) before test at the angle of 90 deg; and (f) after test at the angle of 90 deg.

Grahic Jump Location
Figure 1

The diagram of the strip drawing tester (1)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In