| 摘要 |
PURPOSE: To economically avoid an edge rupture by making a coefficient of friction between the surface of a rolling roll coming into contact with the side edge of a metallic plate and the metallic plate lower than that of the center part. CONSTITUTION: A metallic plate S is rolled by work rolls 1. For instance, the surface roughness Ra of a range A is set to 0.90μm, the surface roughness Ra of a range B to 0.45μm, and the width (e) of the side edge of a steel strip to 100mm. The enlargement of a crack does not occur on the steel strip cold- rolled in this way. That is, a rolling is performed after making a coefficient of friction between the side edge of a width of 5 to 300mm including the edge of the metallic plate S and the surface of a rolling roll 1 coming into contact with this side edge lower than a coefficient of friction in the center part except the side edge. Rolling mill lubricant more than that of the center part is supplied on the side edge. Also, the rolling mill lubricant with a concentration higher than that of the center part is supplied to the side edge. Consequently, the productivity of the rolling can be improved.
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