Brief Introduction of Rough Rolling Setting Model for Packaging Steel Strip

Brief Introduction of Rough Rolling Setting Model for Packaging Steel Strip
　　The rough rolling setting includes wide thickness setting and width setting. The thickness setting is to determine the roll gap and speed of each horizontal roll in the rough rolling zone.
　　The task of width setting is to set the opening degree of each vertical roller (including each pass), and also set the rotation speed of the vertical roller, the front roller speed of the vertical roller and the opening degree of the side guide plate. Compared with the finishing rolling, the rough rolling setting model is on the one hand because the required accuracy is not as good as the finishing rolling, so it can be simplified appropriately, and on the other hand, it has some special characteristics different from the finishing rolling.
　　 Whether it is thickness setting or width setting, first determine the thickness and width distribution of each pass. Thickness distribution refers to how to distribute the reduction of each pass of rough rolling and the reduction of each stand of the finishing mill, so that the slab with a thickness of 1 is rolled through multiple passes of rough rolling to produce a strip with a thickness of Hrc, which is then refined. After rolling 6-7 stands, the required thickness of the finished product can be rolled. Therefore, the rough rolling thickness distribution includes how to determine and the thickness of each pass of rough rolling is the rack number of the rough rolling mill, and the number of the pass.
　　Thickness distribution can also be called load distribution, because when other conditions such as steel grade, temperature, width, roll radius, etc. have been set, the thickness distribution determines the entrance thickness and exit of each pass or each rack The thickness essentially determines the rolling force and rolling moment of the pass or the stand, and also determines the rolling power under the condition of a fixed speed.
　　 Therefore, thickness distribution is not only the main content of the rolling procedure, but also the determination of the thickness of each pass or the exit of each stand is also the basis for the computer setting model to calculate the roll gap and speed settings. It is an important part of computer control. Function.
　　 Hot strip rolling has two zones: ancestor rolling and finishing rolling. The first task of the distribution is to determine the exit thickness of the rough rolling zone. In fact, it determines the load between rough rolling and finishing rolling. distribution. When the H value is large, the rough rolling load is reduced, and the finishing rolling load increases. The opposite is true when the value is small.
　　 In principle, as long as the precision unit has sufficient capacity, it should be larger.
　　The increase in the thickness of the strip is conducive to reducing the number of roughing passes, shortening the roughing rolling time, and increasing the finishing rolling temperature, but it may increase the load of the finishing rolling unit (has little effect on the finishing rolling time). The thickness of the strip should first be determined according to the thickness of the finished product. Generally speaking, if a thinner product needs to be rolled, the thickness of the strip needs to be reduced accordingly, but the thin strip cannot guarantee the finishing required for rolling a thin product. Rolling temperature.