Masao Kuroda, Isao Gokyu, Kakunosuke Yamamori and Tatsuo Watanabe
In order to investigate the effect of rolling conditions on spread in wire flattening, Al, Cu and steel wires of various sizes were rolled on a two-high mill having rolls of 257 mm and 69 mm diameter, respectively. The results were as follows: (1) When the reduction was small, the deformation of wire was heterogeneous and localized upon the regions near the contacting surfaces with the rolls, therefore the specific spread was small in this stage. The greatest amount of specific spread was obtained by 15∼30% reduction in thickness. (2) The spread increased with increasing reduction in thickness per pass. (3) The relation between the strength of the material and the amount of spread was not clear. (4) The most important factor influencing the spread was the ratio of the roll to the wire diameter. Increase of this ratio increased the spread. (5) From the experimental results an experimental formula for spread including the total reduction in thickness, the reduction per pass, the roll and the wire diameter, and the properties of wire was introduced.
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