鋼片のレーザきず手入れのための要素技術の開発

抄録

Laser repairing of surface defects of steel billet was studied. Four core technologies necessary for developing the new method were extracted and developed. First, a new optical system focusing a laser beam to line-shape was developed, in order to melt off surface defects. Secondly, laser melting method with O₂-gas blow was developed for removing molten parts of the surface not to remain bad effects on the billet quality. Thirdly, it was made possible by laser heating process simulation model and experiments, to predict the required laser power for repairing both cold and hot billet. Fourthly, a flying optical system, which focuses a laser beam at each position of surface defects of the fast running steel billet, was discussed. It can also decrease the required laser power by running along the same direction of the billet. Thus, core technologies have been prepared. So, the laser repairing method for steel billet will be realized as a total system.