热轧宽幅钛薄板板形控制

Shape Control of Hot-rolled Wide Titanium Sheet

某厂2800 mm轧机在热轧宽度2000 mm以上、厚度6 mm及以下的钛板时,出现较为严重的边浪,在退火环节难以校平。由于波浪较大,板面在轧制过程中出现严重的划伤,掉落的钛屑产生许多压痕,不仅影响板材外观质量,而且增加后续表面处理难度。针对上述问题提出了改善轧制板形的方法:减小末三道次压下量,降低轧制力,减少轧辊的弹性变形,以达到缓解边浪的效果;磨削支承辊和工作辊与原始辊形匹配合理,保证平直的承载辊缝;对工作辊分段冷却,且精确调整区域流量使轧辊的热凸度能够得到有效的控制。通过本次改进,取得了明显的效果,热轧宽幅钛薄板边浪完全消除,并生产出板形良好、表面无明显缺陷的宽幅薄板。

The more serious side waves are produced on the hot rolled titanium sheets with over 2000 mm wide and less than 6 mm thickness in 2800 mm mill of a plant, and it is difficult to straighten in the annealing process. Because of the large waves, the surface of the sheets is seriously sccrathed and lots of indentations are produced in the rolling process, which not only damages the surface quality, but also increases the subsequent surface treatment difficulty. Aiming at the above mentioned problems, the method for improving rolling sheet shape was presented. The side waves were alleviated tlrough decreasing the end of three pass reduction, reducing the rolling force and the elastic deformation of the rollers. Reasonable matching grinding backup roller and work roller with the original roller shape ensured the flat loaded roll gap. Cooling piecewise work roller and adjusting precisely the regional flow made the thermal-camber of roller controlled effectively.Through these improvements, the obvious effect was achieved. And hot rolled wide titanium sheet edge waves were completely eliminated. Wide sheets with good sheet shape and without obvious surface defects were produced.