Obvious linear scratches, point indentations and large-area scuffs appear on formed sheet surface, damaging galvanized and color coated layers and seriously affecting appearance and market value.
Main causes: unpolished burrs and welding slag on forming roller surface, rusted and stuck bearings causing rigid friction, and hard foreign matters accumulated in roller gaps.
Standard solutions: Disassemble and polish forming rollers to remove burrs and welding slag completely; regularly clean iron filings and hard debris in roller gaps; inspect and replace rusted or stuck bearings to ensure flexible roller rotation and avoid sheet surface damage.
