Analysis Of Defects In Cold Rolling Of Pure Titanium Plate And Titanium Strip

After the cold-rolled titanium plate and titanium strip is coiled into a coil, the circumferential local bulge on the surface of the coil is called ribbed. For the pure titanium belt, the stiffening occurs in the thickness of less than 0.8 mm, the performance of the single-rib mainly. The direct result caused by stiffening is to make the strip produce additional wave shape, so that the plate shape and surface quality is affected, resulting in product degradation, and even serious shear, winding treatment. It not only reduces the product quality, but also causes the waste of raw materials and reduces the production efficiency. The results of rolling test show that the amount and probability of bar initiation are different for different batches of hot rolled coil with the same specification, which shows that the raw material itself has great influence on the bar initiation in cold rolling. In the hot rolling process, there are many defects such as scratch, Sickle Bend and crack, which affect the appearance of all kinds of defects in the following cold rolling process. Although the influence of local high point of hot-rolled material on cold-rolled strip is limited to the high point and a small range nearby, for extremely thin strip, it is enough to cause local bulge“Ribbed” and even form local wave and bulge interlaced serious quality defects.

Through the test rolling of the same tension of the different flatness curve and the different tension of the same flatness curve, it is found that when the flatness curve refers to the setting of stainless steel strip under the condition of the same tension and the different flatness curve, when the flatness curve refers to the setting of the stainless steel strip, when the flatness curve refers to the setting of the stainless steel strip, when the flatness curve refers to the setting of the flatness curve, when the flatness curve refers to the setting of the flatness curve, when the flatness curve refers to the setting of the The probability of stiffening is high, the probability of stiffening and the quantity of stiffening decrease greatly after the strip shape curve is adjusted for trial rolling. Under the condition of the same shape curve and different tension settings, the probability of steel bar forming in large tension rolling is higher than that in small tension rolling, but the difference between the probability of steel bar forming in small tension rolling and the amount of steel bar forming is not obvious, it is concluded that the traditional high tension rolling of stainless steel strip is not suitable for the rolling of pure titanium strip. Based on the analysis of the above test rolling results, this kind of circumferential bulge is the result of many factors, such as shape control, tension control and so on, the stiffening is the result of an axial force.