Automatic residual burr detection on steel slabs by a thermographic system

摘要

At the continuous casting plant of ThyssenKrupp Steel AG in Duisburg-Bruckhausen, the 2.6 m wide slabs are first cut to the required length and then slit in order to obtain slab sizes of up to 11.7 by 1.6 m. Cutting of the slabs is done with flame cutters in the cutting and slitting line (figure 1). The flame cutting operation causes a flow of slag. This slag partly solidifies as burr on the underside of the slab, or it is flattened against or rolled into the bottom of the slab during further conveying on the roller tracks. This formation of burrs depends, among other things, on the steel grade of the slabs. In the downstream process the slabs are run through an automatic deburring machine for removal of protruding ridges. However, depending on the steel grade of the slabs, these ridges may be very flat, so that the slab edges cannot always be completely deburred. Some of the burrs, so-called residual burrs, will remain on the slab.