超高强带钢强度高、硬度大、平整轧制过程中伸长率小,因此工作辊压印能力弱,即轧辊粗糙度压印率较小而带钢表面粗糙度遗传率大,同时来料带钢表面粗糙度没有得到精准控制,最终导致成品带钢表面粗糙度难以达标。首先,充分考虑超高强带钢的冷轧及平整轧制特点,分析了带钢伸长率、工作辊表面粗糙度及来料表面粗糙度对超高强带钢表面粗糙度的影响。其次,提出超高强带钢冷轧机组与平整机组轧制过程表面粗糙度协同控制策略,通过设定冷轧机组第4机架与第5机架工作辊表面粗糙度完成对平整来料表面粗糙度的控制,进一步设定平整机组工作辊表面粗糙度范围,通过调整带钢伸长率的大小,建立以超高强带钢成品表面粗糙度控制精度为目标的冷轧及平整机组协同控制技术模型。最后,将控制技术应用到国内某冷轧与平整机组4种典型规格的超高强带钢实际生产过程中。工艺结果表明,平整机组来料表面粗糙度与控制标准的偏差降低了0.1 μm,满足平整机组对来料表面粗糙度的要求,同时,成品带钢表面粗糙度控制精度达到了90%以上,粗糙度波动值降到0.06 μm以下,有效地提升了平整机组对超高强带钢表面粗糙度的控制能力,具有进一步推广应用的价值。
Abstract
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 roughness. 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 surface 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 leveling 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 specifications 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 surface roughness control accuracy of the finished strip reaches more than 90%, and the fluctuation value of the roughness 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.
关键词
超高强钢 /
冷连轧机组 /
平整机组 /
工作辊 /
表面粗糙度 /
协同控制
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Key words
ultra-high strength steel /
cold rolling unit /
leveling unit /
work roller /
surface roughness /
collaborative control
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脚注
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基金
辽宁省教育厅高等学校基本资助项目（LJKZZ20220040）; 中央引导地方科技发展资金资助项目（236Z1024G）; 河北省高等学校科学技术研究资助项目(CXY2024018)
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