CORRECTING METHOD FOR UPPER AND LOWER PRECAMBERING OF ROD STEEL MATERIAL BY COOLING

摘要

PURPOSE:To decrease the occurring rate of bending of the rod steel material, by holding the steel material at the position to which each of the surface plate rails has been raised or lowered according to the temperature difference of section of the rod steel material unitil the temperature of the steel material falls to the preescribed point so that the curve connecting the top surface of the above rails may fave the prescribed curvature.