SURFACE PRETREATMENT OF INGOT FOR ROLLING

摘要

PURPOSE:To maintain the conventional quality even by rolling without scalping and to improve yield by polishing the surface of an ingot of aluminum or the alloy thereof and removing oxides and defects therefrom. CONSTITUTION:The oxides 9 remain on the surface by the contact with the aim. air and slip flaws, etc. are formed in the slight time when a molten metal flowing out of a tundish 10 via a molten metal nozzle 11 solidifies between upper and lower caster rolls 12. These defects are heretofore cut away by a scalping machine and thereafter the ingot is rolled but the ingot is polished by brush rolls 2 made of a suitable material such as ire brushes or nylon brushes in place of such scalping to remove the oxides 9 and the defective parts. The yield is thus considerably improved by non-scalping while the surface quality equiv. to the conventional surface quality is maintained.