Investigation of Effects of Using Caliber Rollers in VSB Edger of Roughing Mill of Mobarakeh Steel Company

Abstract

One of the slab width reduction methods in hot rolling mill is to use vertical rollers called edger; this is called the edging process. In edging process the slab thickness near the edges of the workpiece which are in contact with edger rollers is more than the other parts which results in apparent rise in the edges of the workpiece called dog bone. This uneven thickness increment decreases efficiency of the edging process. One of the methods to avoid or decrease dog bone is to use caliber rollers in width reduction process. Experimental results obtained from hot rolling manufacturer show that in case of proper choosing of the caliber rollers, efficiency of edging process increases from 30% to about 70%. In this research, effects of using caliber rollers in Mobarakeh Steel Company roughing mill VSB edger are studied by using a commercial software. Based on the results of this research, it has been recommended to change the roller type from flat to caliber. According to this study, using caliber rollers will result in reduction of dog bone, improvement of edging efficiency and enhancement of stability of the edging process..