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Abstract:

The paper presents experimental results that concern cold longitudinal rolling of flat bars made from EN AW-6063 aluminium alloy. The investigations aimed at determining the impact of the height reduction (h) on the spreading (b) for variable initial heights o material (h0). The samples used in experimental investigations into cold longitudinal rolling were of segments of flat bars having width of b0 = 20 mm, length l0 = 40 mm and different initial heights of h0 = 2 mm; 3 mm; 4 mm and 5 mm, respectively. The longitudinal rolling process is conducted at a special stand – rolling mill DUO-100. The material was rolled with different percent relative rolling reductions (30%; 50%; and 70%, respectively). The theoretical results of spreading calculated from Siebl’s, Bachtinov’s and Gubkin’s formulae were validated against experimental data (Geuze’s formula). On the basis o investigations carried out into cold longitudinal rolling of flat bars made from from EN AW-6063 aluminium alloy, it was found that computed and experimental spreading increases with an increase in relative rolling reductions regardless of assumed different initial heights of material.

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Influence of height reduction on spreading for variable initial heights of material in the experimental investigations of cold longitudinal rolling of flat bars made from EN AW-6063 aluminum