薄规格SPCC带钢厚度波动原因分析及改进

Cause Analysis and Improvement of the Thickness Fluctuation in Rolling Thin Strip(SPCC)

针对济钢1 450 mm单机架UCM轧机轧制成品厚度在0.3 mm以下薄规格SPCC带钢时,成品道次轧制力大、厚度波动大的情况,分析认为,主要是新工作辊辊径大、热辊时间短以及乳化液性能的变化导致的工作辊与带钢间的摩擦系数增大,轧制力增大。通过优化轧制规程,改进乳化液各项性能,优先使用小辊径工作辊,降低工作辊辊面粗糙度,增加工作辊热辊时间等措施,保证了生产的顺行,轧制力由14 000 k N以上降至约8 000 k N,厚度波动由±6%降为±1%。

When the thin specification （SPCC） strip with thickness below 0.3 mm were rolled by 1 450 mm single stand UCM mill in Jinan Steel, the rolling force in finishing pass is too large and the thickness fluctuation is larger. Analysis showed that the reasons are larger diameter of new work rollers, shorter time of heating the work rollers and larger friction coefficient between the work roller and steel strip caused by the change of the emulsion properties. The normal production was insured by optimizing the roiling schedule, improving the properties of the emulsion, giving priority to use the work roller with smaller diameter, reducing the work roller surface roughness, increasing heating work roller time etc. The rolling force was decreased from more than 14 000 kN to about 8 000 kN and the thickness fluctuation was reduced from ± 6 % to ± 1%.