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• W2193892904 abstract "Summary: Two types of t est with plasticine as a model material are used to investigate transfer layer formation in metal working. In the first series of tests, strips of plasticine are rolled between cylindrical rollers. By rolling with alternating colours of plasticine, the way in which the transfer layer evolves is explored. The evidence strongly suggests that plasticine particles transferred to the rolls are able to pick off plasticine from the strip on successive passes. In a second set of experiments a ‘scratch test’ is performed on a plasticine workpiece. Results from this test correlate well with the rolling tests, showing a peak in transfer layer formation at a similar temperature. The results confirm the usefulness of plasticine as a suitable material to investigate transfer l ayer formation in metal rolling and help inform development of experimental procedures to study the evolution of metal transfer layers. However the tribological details will differ in metal rolling. Material transfer is common in metal forming processes , with particles from the soft workpiece transferring to the hard roll. The transfer layer formed on the tool surface has a significant effect on friction and the strip surface finish [1-4]. Particularly in hot rolling, there is a tendency for the layer to grow in an uncontrolled manner with the resulting thick layers giving poor surface finish. In cold rolling, where surface finish is more critical, poor control of transfer layers leads to reduced surface quality. Three types of material transfer can occur during the rolling of metals [1]. A low-friction slurry, containing a mixture of very small transferred particles, lubricant and reaction products, may form on the surface of the rolls under favourable lubrication conditions [5]. The second type of transfer layer consists of tiny metal particles that are deposited on the roll. This type of transfer layer has no detrimental effect on friction or on the strip surface finish. The final type of material transfer consists of thick layers made up of clusters of small particles [1]. Although the role of transfer layers is critical to surface finish in metal forming, relatively little is known about the factors controlling their growth. Part of the reason for the lack of knowledge may be due to the practical difficulties of examining growth of such layers in real metal forming operations. This paper uses plasticine as a model material to study transfer layer growth. The focus of the paper is to provide insights into mechanisms of transfer layer formation and to develop practical methodologies to characterising transfer layers. Two sets of tests are described, a series of rolling experiments, and a set of tests comparing transfer layer formation in rolling and scratch tests. Although it is hoped that some of the mechanisms seen in these tests are relevant to metal forming, the details, particularly of the tribo-chemistry, are not reproduced." @default.
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• W2193892904 date "2007-09-26" @default.
• W2193892904 modified "2023-09-27" @default.
• W2193892904 title "Modelling of transfer film formation in rolling using plasticine." @default.
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