Development And Experimental Research Of Cold/Hot Leveler Process Model For Heavy Plate

At present,China's iron and steel industry is in a downturn,overcapacity is very serious,high quality products rely heavily on imports,the steel industry restructuring is imminent.The plate is a widely used steel,which has a higher proportion of steel products.The leveling process has a great influence on the quality of plate,The advancement of leveling equipment and process determines the product quality and production efficiency directly.Through the optimization of cold / hot leveling process and the development of the corresponding function in the 4300 plate production line of the shouqin,the leveling problem of the steel plate has been solved,and the improvement of the leveling process has been realized.The main work of this paper includes:Introduced the shou Qin 4300 mm plate production line in the cold and hot leveling machine characteristics and differences,given the leveling machine and process parameters,and did further research of plate leveling principle,established the mechanical model of plate leveling.Cold leveling technology of medium plate was developed.It mainly includes: according to the plastic deformation rate(OVS)of the leveling plate,the nine / five leveling mode change principle of the cold leveler is determined,The normal leveling of the head and tail of the steel plate and the shape quality of the steel plate are guaranteed;Through the material tracking and analysis technology in the leveling process,the cold leveling technology of ultra short plate and extra long plate is developed,The normal leveling of this kind of steel plate is guaranteed;The leveling process of pipeline steel and high strength steel has been developed.The steel plate is leveled and the plate shape is good.The hot leveling process of plate was developed.It mainly includes the improvement of the existing heat leveling process,including the improvement of the calibration process,the adjustment of the leveling process parameters,the development of the pass through leveling function and the development of the leveling protection function;For the plate which in rolling,cooling and leveling process,the plate shape are good,but serious buckling problem in the cooling bed happened,According to whether the plate thickness is greater than 15 mm,the technology of small leveling force leveling and the strategy of increasing plastic deformation are developed respectively,the result is good.The leveling technology strategy of heavy plate is developed,and the plate shape defect is eliminated by field verification.