道次间冷却工艺对轧制力的影响分析

Analysis on Influence of Inter-pass Cooling Process on Rolling Force

采用道次间冷却工艺会使轧件温度降低,引起轧制负荷增加,影响轧机出口钢板厚度控制。但目前对于该影响程度多局限于定性认识上,缺乏对其定量性评价。基于此,结合模型分析、实验室研究和工业试验,分析了道次间冷却工艺参数对轧制力的影响规律。结果表明:对于100mm厚钢板,通过道次间强水冷,在心表形成150℃左右温差时进行轧制,变形向钢板心部渗透;对于国内某3500mm中厚板轧机,采用“温控-形变”耦合轧制,道次轧制力增加了15%左右,由此引起的钢板厚度变化在0.3mm左右,在投入自动控制算法后,该厚度偏差可在后续道次消除。

Inter-pass cooling process will reduce the temperature of the rolled piece and increase the rolling force, which will affect the final plate thickness. However, so far the general understanding of its impact is only qualitative without quantitative analysis. Based on this, combined with model analysis, laboratory research and industrial test, the influence of inter-pass cooling process parameters on rolling force was analyzed. The results showed that for 100 mm-thick steel plate, the deformation penetrated into the center of the steel plate when the temperature difference between the surface and the center of the steel plate was about 150 ℃ through inter-pass water cooling process;and that for a 3 500 mm heavy plate mill in domestic, it’s rolling force increased by about 15% when the method of “temperature and deformation control” was adopted, resulting in the thickness variation of plate about 0.3 mm. The thickness deviation could be eliminated in subsequent passes after the introduction of automatic control algorithm.