JPS5568110A - Setting method for initial rolling of six-stage rolling mill - Google Patents

Abstract

PURPOSE: To manufacture the product with shape free from the irregularity in the breadth direction, by predicting the shape parameter of next rolled product depending on the functional model formula, and by correcting the intermediate roll's position and the roll bending pressure for the period of rolling work for the next rolled product.

CONSTITUTION: The actual rolling data are detected concerning the shape detection parameter showing the strip shape elongation pattern in the direction of breadth of the former rolled product as the four-degree function, the intermediate roll's position at that time, and the work roll bending pressure. The actual rolling data for the former rolled product and the model correction factor are calculated from the functional model formula λi=fi (δ, Q, S, H, h, ..., εi), in which λi is the shape parameter, δ is the intermediate roll's position, Q is the roll bending, S is the screw- down position, H is the inlet side sheet thickness, h is the outlet side sheet thickness, and ε is the model correction factor. Moreover, the shape parameter for the next rolled product is predicted, and the intermediate roll's position and the roll bending pressure for the rolling work of next product are corrected depending on the shape affection factor against the intermediate roll's position and the roll bending pressure obtained under the rolling condition for the next rolled product.

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