摘要
基于秒流量相等的体积不变条件和弹性薄板稳定性理论,推导了理想条件和实际工况下冷轧带钢横向厚差、宽厚比与板形之间的耦合关系,分析各因素对临界失稳板形的综合影响规律。参考理想条件下横向厚差与板形的基本关系,建立实际工况下的影响模型。结果表明,0.3mm以下厚度薄带的横向厚差变化量对板形的影响明显;根据弹性薄板稳定性模型,分析横向厚差和宽厚比对临界失稳板形的影响。结果表明,当冷轧带钢的宽厚比大于3000时,临界失稳应力明显减小。通过实测1450六辊冷轧机的两卷典型带钢横向厚差,得到在生产不同宽厚比的超薄规格带钢时,需要根据入口带钢的横向厚差,调整负载辊缝形状,以保证出口带钢的横向厚差变化量满足板形不失稳条件,从而获得了良好的板形。
Based on the equal flow per second condition of constant volume and the elastic sheet stability theory, the coupling rela- tionships of the lateral thickness difference, the width-thickness ratio and the shape were derived under ideal conditions and actual conditions, so the combined effects of various factors on the critical instability shape could be obtained. First, considering the basic relationship between the lateral thickness difference and the shape, the affected models under the actual conditions were es tablished. The test data showed that the shape changed with lateral thickness difference very clearly for the shin strip with the thickness less than 0. 3 mm. Then, based on the elastic sheet stability model, the effects of the lateral thickness difference and the width-thickness ratio on the critical instability shape were derived. The results showed that the critical buckling stress signifi- cantly reduced for the strip with the width-thickness ratio greater than 3000. By measuring the lateral thickness differences of two volumes of typical strips in the 1450 cold rolling mill, the effects of the lateral thickness difference and the width thickness ratio on the shape were analyzed. It is showed that the load roll gap should be finely adjusted according to the lateral thickness differ- ence of strip in entrance to ensure that the lateral thickness difference in export satisfied the shape non-instability condition and so the good shape could be obtained.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2015年第4期54-60,共7页
Journal of Plasticity Engineering
基金
国家重大科技成果转化资助项目(2012GG01)
国家自然科学基金资助项目(51305387)
关键词
冷轧带钢
横向厚差
宽厚比
临界失稳板形
秒流量相等
cold rolled strip
lateral thickness difference
width-thickness ratio
critical instability shape
equal flow per second
