Imaging-based In-Line Surface Defect Inspection for Bar Rolling

We delivered advanced surface inspection systems to bar and rod mills based on imaging technology. Bar rolling has its unique requirements and poses certain challenges due to its geometry and rolling speeds. Three pilot systems have been installed; this paper reviews the systems’ specifications and performance, and provides a comparison to eddy-current devices. Also discussed is the potential for using the data in process control. The goal is to help the bar mills to deliver a product free of surface defects.