热轧无取向硅钢小凸度控制研究

Research on Small Crown Control of Hot Rolled Non-oriented Silicon Strip

为提高某厂成品硅钢横向厚度差合格率,基于热轧板廓凸度与成品硅钢横向厚度差的相关性分析,得出保证横向厚度差精度的最佳热轧板廓凸度范围。提出了铸机轻压下改善中间坯边部形状,优化支承辊、工作辊辊形和相应的CVC窜辊策略以及调整工作辊配辊策略三种热轧硅钢板廓凸度改进方案。研究结果表明,三种方法单独作用下板廓凸度和横向厚度差质量都有所改善。最终将三种方法同时运用到生产实际,试验结果表明,在新的轧制策略下既保证了轧制稳定性,同时硅钢板廓凸度得到了改善,横向厚度差C15≤7μm,合格率由原来的75%提高到的86.4%。

In order to solve the problem of transverse thickness deviation of the silicon strip, Based on the analysis of the correlation between the profile of hot-rolled slab crown and the transvers thickness difference, the optimal hot-rolled slab profile convexity range to ensure the accuracy of transverse thickness deviation was obtained. Three kinds of hot-rolled silicon steel profiles crown improvement schemes, which were the use of caster light pressure to improve the shape of the intermediate billet shape, optimizing the backup roller, work roll contour and the CVC roll shifting strategy and the work roll matching strategy methods, were proposed. The results showed that the profile crown and thickness deviation quality were improved under the three methods alone respectively. Finally, the three methods were applied to the actual production at the same time. The test results showed that the stability of the rolling process was guaranteed and the strip profile was improved under the new scheme, the qualified rate of the transverse thickness deviation C15-7μm increased from the original 75% to 86. 4%.