[논문]Texturing of skin-pass rolls by pulsed laser dispersing

Hilgenberg, K.; Steinhoff, K.

doi:10.1016/j.jmatprotec.2015.05.027

Texturing of skin-pass rolls by pulsed laser dispersing

Journal of materials processing technology, v.225, 2015년, pp.84 - 92

Hilgenberg, K. (Welding Technology, Federal Institute for Materials Research and Testing) , Steinhoff, K. (Metal Forming Technology, University of Kassel)

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Abstract Skin-pass rolling is a substantial process step in the production line of sheet material for automotive applications. Textured rolls are used to emboss an immaterial surface structure on sheets for improving their formability in subsequent deep drawing operations. In this paper, state of the art techniques for texturing skin-pass rolls are discussed in order to assess their ability to meet optimal tribological parameters. Two main problems are identified: firstly, structured rolls are affected by ongoing wear limiting the operating time and necessitates perpetual maintenance. Secondly, state of the art techniques are not able to exploit the theoretically known potential of immaterial surface structures for enabling micro-lubrication mechanisms due to geometrical inadequacies. Based on these findings, a new approach for texturing of skin-pass rolls is introduced. The technique uses a localised dispersing of hard ceramic particles by use of pulsed laser radiation. It is shown in this paper that this technique allows the creation of elevated structures with high hardness on the surface of 1.2379 cold-working steel. The wear behaviour of such textured rolls was investigated in a lubricated twin-disc-test. The experiments show that no significant wear of the laser produced structures occur during the test duration. The observed results lead to the assumption that the proposed technique allows the creation of skin-pass roll structures with significantly higher durability. Highlights A localised laser dispersing of ceramic particles was used to create a surface texture on rolls. Dome-shaped and ring-shaped spots with significantly higher hardness were produced. The structures showed no significant wear to the end of the test duration in a lubricated twin-disc-test. A shot-blasted roll lost 70% of its elevated surface fractions in a comparative test.

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참고문헌 (9)

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Texturing of skin-pass rolls by pulsed laser dispersing

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