酸轧机组轧制力波动与成品带钢厚度减薄缺陷研究

Study on rolling force fluctuation and thickness thinning of finished strip in PL-TCM

针对酸轧机组在IF钢轧制过程中出现轧制力波动及对应位置成品带钢减薄的问题,结合酸轧机组的设备及工艺特点,通过对比轧制力波动位置与对应热轧来料位置的厚度,分析了厚度与轧制力波动的关系;并通过常温酸洗和高温酸洗试验,研究了JM钢与IF钢氧化铁皮厚度对酸洗速度和酸洗效果的影响,在此基础上提出了酸轧模型的优化措施。结果表明:IF钢轧制力波动与热轧来料厚度无关,主要是因为IF钢表面氧化铁皮厚度较大,酸洗时系统的酸轧模型不能调节酸洗工艺与轧制工艺的速度匹配造成的;将调节酸轧模型的变形阻抗和张力设定值的优化措施应用到现场生产实际,有效解决了酸轧机组出现的轧制力波动现象及成品带钢厚度减薄缺陷,提高了生产稳定性,为企业带来了良好的经济效益。

In view of the rolling force fluctuation during the rolling process of IF steel in the PL-TCM and the thinning of finished strip at the corresponding position, combined with the equipment and process characteristics of the PL-TCM, the relationship between the thickness and the rolling force fluctuation was analyzed by comparing the rolling force fluctuation position with the thickness at the corresponding position of hot rolled strip, and the influence of the thickness of iron oxide scale of JM steel and IF steel on the pickling speed and pickling effect was studied through the acid pickling test at room temperature and high temperature. On this basis, the optimization measures of PL-TCM model were proposed. The results show that the rolling force fluctuation of IF steel has nothing to do with the thickness of hot rolled strip, mainly because the thickness of iron oxide scale on the surface of IF steel is large, and the PL-TCM model of the system cannot adjust the speed matching between the acid pickling process and the rolling process during acid pickling. The optimization measures of adjusting the deformation impedance and tension set value of the PL-TCM model were applied to the field production practice, which effectively solved the rolling force fluctuation phenomenon and the thickness thinning defect of finished strip in the PL-TCM, improved the production stability, brought good economic benefits to the enterprise.