Collaborative control of surface roughness during cold rolling and leveling of ultra-high-strength strips
Ultra-high-strength steel has high strength,hardness,and small elongation in the process of flat rolling,so the working rolls have weak imprinting ability,i.e.,the imprinting rate of roll roughness is small and the heredity of strip surface roughness is large,and at the same time,the surface roughness of incoming strips is not accurately controlled,which ultimately results in the difficulty of the finished strips in reaching the standard of surface rough-ness.Firstly,the influence of strip elongation,work roll surface roughness and incoming material surface roughness on the surface roughness of ultra-high-strength strip is analyzed by taking full consideration of the characteristics of cold continuous rolling and flat rolling of ultra-high-strength strip.Secondly,a cooperative control strategy of sur-face roughness in the rolling process of cold rolling unit and leveling unit of ultra-high-strength strip steel is proposed,in which the surface roughness of work rolls in the 4th and 5th racks of cold rolling unit is set to complete the control of surface roughness of the incoming material for leveling,and the range of surface roughness of work rolls in the lev-eling unit is set to establish the control precision of surface roughness of the finished product of ultra-high-strength strip steel with the target of the strip steel elongation.By adjusting the strip elongation rate,the cooperative control technology model of cold rolling and leveling unit is established to control the surface roughness of finished ultra-high-strength strip steel.Finally,the control technology is applied to the actual production process of four typical specifica-tions of ultra-high-strength strip steel in a domestic cold rolling and leveling unit.The process results show that the deviation of the incoming surface roughness of the leveling unit from the control standard is reduced by 0.1 micron,which meets the requirements of the leveling unit for the incoming surface roughness,and at the same time,the sur-face roughness control accuracy of the finished strip reaches more than 90%,and the fluctuation value of the rough-ness is reduced to less than 0.06 micron,which effectively enhances the ability of the leveling unit for the control of the surface roughness of ultra-high-strength strips,and is valuable to further popularize the application of this technique.
ultra-high strength steelcold rolling unitleveling unitwork rollersurface roughnesscollaborative control
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