Analysis of influence factors on edge trimming quality of cold rolled ultra-low carbon strip and its improvement measures
Aiming at the problems of zigzag edges and burr defects that readily occur during the edge trimming process in the production of cold rolled ultra-low carbon strip,its edge trimming quality under different trimming process parameters,and different positions and shapes of the base strip were discussed.Based on analyses of mechanical properties,microstructure,and fracture morphology,the impact of base material characteristics and trimming processes on the edge trimming quality of the strips are clarified.Furthermore,a process control scheme is proposed to improve the edge trimming quality of base material for cold rolling.The analysis of the fracture morphology of the edge shear indicates that the fracture morphology of the strip edge after trimming can be divided into a trimming zone and a fracture zone along the thickness direction of the strip,and there are significant differences in the proportion of these two zones in the thickness di-rection under different strengths,trimming processes,and strip shapes.As the strength of the strip increases,the proportion of the trimming zone in the thickness direction significantly rises.The influence of the blade gap value on the edge trimming quality is signifi-cantly greater than that of the overlap between the upper and lower blades.As the blade gap value increases,the proportion of the trim-ming zone in the fracture morphology of the edge shear decreases significantly.The presence of wave shapes on the strip edge results in the appearance of oblique cutting zones and burr zones in the shear fracture,and the boundary between the trimming zone and the fracture zone fluctuates significantly,seriously affecting the edge trimming quality of the strip.By adjusting the blade gap value and overlap value,controlling the trimming and straightening lengths,and managing the wear degrees of the rubber sleeve and blades,the edge trimming quality of cold rolled ultra-low carbon strip has been improved.
ultra-low carbon steelbase material for cold rollingedge trimming qualityblade gap valueblade overlap valuestrength of hot rolled striphot rolled strip shape
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