Experimental and Semi-analytical Study of Wear Contour of Roll Groove and Its Applications to Rod Mill

Abstract

In this study, we propose a semi-analytical model which predicts the wear contour of grooved roll in the oval–round (or round–oval) pass rolling process. In the proposed model, the wear contour is assumed to be of a second order polynomial function and computed by using the linear interpolation of the radius of curvature of an incoming workpiece, that of roll groove and a weighting function which takes into account roll force, longitudinal contact length of work roll that undergoes during rolling, property of work roll and roll tonnage. The validity of the proposed model has been examined by applying it to the roughing train in the POSCO No. 2 Rod Mill.A wear measurement system of roll groove has also been developed. Roll wear contour was measured using ‘resin plastics’ which can flow, under small external load, without restraint into any region worn out. The deformed resin plastics, i.e., roll wear contour, was measured.Results show the proposed model in this study, in overall, has a reasonable accuracy in predicting the roll wear contour but the model underestimates slightly the measurements as the roll speed increases. Roll wear has been found to be linearly dependent on the longitudinal contact length of work roll, roll tonnage, but non-linearly on the roll force and inverse proportional to hardness of work roll.