Process Optimization And Control Strategy Of Tail Precision In Plate And Strip Rough Rolling

Rough rolling is one of the most important processes of plates and strip rolling. Slipping occurs for bigger reduction at the latter passes because of the failure of meeting the bite condition. Mending the bite condition is the effective measure for smooth operation, increasing the reduction and the production efficiency. In the production practice of MeiGang’s1422production line, the strategy of bigger reduction at tail is applied in the R2units, and this strategy brings about the increasing tail spread, which can be solved by exerting tail short stroke control strategy. Optimization model is established through the theoretical analysis, numerical simulation to exert optimization control to tail reduction and short stroke control. Numerical simulation adopts finite element software DEFORM-3D. The simulation is divided into two parts:the first part is the tail spreading model is established after the reduction of vertical and horizontal rolling; The second part is the according tail spreading model is established after the reduction of vertical and horizontal rolling at tail. Finally, the established models in the two parts are combined. The relationship between one single factor and the spread incremental is studied in the DEFORM-3D finite element simulation. Then relationship between the multiple coupled factors and spread incremental is studied. Physical rolling simulation experiment of lead is conducted because it is not enough to only adopt finite element software simulation. According to the experiment procedures, wedge reduction should be given at tail, but the mill in our lab is not able to exert wedge reduction at tail, so equivalent tail wedge rolling is applied in order to solve this problem and DEFORM-3D is used to study the equivalence of the tail spread incremental in the two rolling situations. Simulation results show that the spread incremental is nearly equal in the two rolling situation and we can see the equivalence.So equivalent rolling can be employed to make up the the deficiency of lab mill. Then the lead rolling and steel billet rolling are carried out in the equivalent way. It shows that the results in lead physical simulation experiment and the steel billet rolling accord with the mathematical models established by DEFORM-3D in trend and values, which proves that mathematical models can describe the law of tail spread changes. Finally, software interface is made by VB language on base of the mathematical models above, which makes the research laws of this paper more intuitive.