Research On The Control Technology Of Strip Shape And Process Of 1700 BAF Cold-Rolled

Flat cold-rolled production is an important step,and its main role is to eliminate the annealed strip yield platform,adjust the mechanical properties of the strip to improve the strip flatness,and to achieve a certain surface roughness.Shougang Jingtang has 2 offline SPM units,respectively,1700mm and 1420mm SPM lines,respectively,by the Wuhan Institute of equipment design and manufacturing and SMS.1700mm Batch annealing flat line mainly produces products for home appliances and a small amount of automotive steel,1420mm back cover tinplate production line is mainly flat.Wherein 1700mm Batch annealing offline temper mill in May 2011 and put into production,the initial production there are many surface quality defects,affecting the normal production once.Through technical personnel research,in particular wave-shaped defects,and now can be effectively controlled,but there is room for improvement.Wave-shaped defects causing possible causes are one by one investigated,also a lot of control wave-shaped defect knowledge and skills during this period are obtained.Based on the theoretical analysis,through field practice,the bending force-fed models are established.The main contents are as follows:(1)Research on the width of the intermediate flat back cover thin gauge strip shape defect generation mechanism,through the support roller mill VCL260 rolling curve optimization,optimization of process parameters and other means,the gauge strip wave-shaped defects have been effectively controlled;(2)Research cover a wide flat back thin gauge strip shape defects,by optimizing the support roll-shaped,plate-shaped pre-set parameter optimization,rolling force-model building and other measures before bending force feedback control,the gauge strip wave shaped defects have been effectively controlled;(3)Research the chain flat steel ribs wave defect,chain steel ribs wave defect control programs and field trials,the surface quality is improved effectively.Through this paper work,the Shougang Jingtang 1700mm,Batch annealing leveling production line parameters are optimized,and substandard performance with the strip surface oxidation color problems are solved.The quality of cold-rolled strip steel products after annealing has also improved...