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In the paper, the speed increase and strip shape optimization for producing thin strip are systematically studied aiming at such problems as low rolling speed as well as prominent shape defects of single-side wave and composite wave in the production of 0.7~1.0 mm thin strip with UCM(universal crown mill) of 2 030 mm pickling line tandem cold mill in Baotou Steel. The internal relations between speed increase and shape defects of thin strip are revealed by analyzing the characteristics of bending roll control for UCM and establishing mathematical model of roll series-strip steel coupling for strip shape control. The strategy of independent control for single-side bending roll is developed as well as the human-computer interaction interface and compensation handler of roll bending force are designed so that the risk of sudden change of strip shape is reduced by the mechanism of integral constraint. Meanwhile, the staged plan of speed increase is formulated as well as collaborative optimization of tension parameters and cooling regime is carried out. The industrial application results showed that the speed of rolling thin strip was increased by 18%, accuracy of strip shape was controlled at 8 I~20 I and hit rate of strip shape was increased to 98.5% after the optimization so that the problems of off tracking and shut-down in furnace area of subsequent process were completely solved. This study could provide the technical support for efficient and stable productions of thin strip with UCM, which is of great significances for improving the quality of such high-end products as automotive sheets.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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