PRODUCTION OF INSERT ROLL

摘要

PURPOSE:To improve machineability and wear resistance and to reduce cost by heating the core part of a roll to a specific temp. applying a reducing flux on the outside, installing the core part in a master mold and casting a molten high chromium cast iron into the space between the master mold and the core part. CONSTITUTION:The core part 1 of a steel roll is heated to >=500 deg.C and thereafter a reducing flux is sprayed or coated on the outside surface and the core part is installed in the central part of a master mold 3. The reducing flux begins to melt immediately and remains on the surface while cleaning the surface by absorbing rust and dirt therefrom. The molten high chromium cast iron is cast through a sprue 4 into a space 2 while the core part 1 is still at >=500 deg.C. The flux ascends gradually together with the molten metal when the molten metal ascends in the space 2 so that the molten metal contacts with the clean outside surface of the core part 1, thus yielding the thoroughly cast and deposited surface.