Font Size: a A A

Study On Controlling Model For Deviation In Aluminum Hot Continuous Rolling And Its Application

Posted on:2015-07-26Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z FuFull Text:PDF
GTID:1221330431997966Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
In Aluminum Hot continuous Rolling, deviation control is a technical problem in desire need to be solved. In this paper, study on controlling model for deviation in aluminum hot continuous rolling and its application is finished, based on the project Deviation Control Strategy for Wide Aluminum3104Coil in Hot Rolling, and also on the Aluminum production line. Deviation correction control strategy and its adaptive control strategy are put forward which can be applied in the state field of production. The main research contents and outcomes are as follows:1) Based on the evolution mechanisms of deviation in wide Aluminum coil in hot rolling, a theoretical basis, constant wedge rate theory, is raised, that the strip before and after rolling should satisfy constant wedge rate.(1) Observation modelling of wedge in aluminum hot rolling is conducted. The target wedge concluded from constant wedge theory and the wedge in the exist side calculated by observation model are taken as observed quantities.(2) Criterion for deviation observation, according to which the deviation state can be estimated, is established based on the observed quantities, open-loop control strategy is put forward.(3)With Matlab/Simulink, mathematical model for deviation is established.2) According to the lateral asymmetry feature in hot rolling production line, strategy for balance control is set up with the variable, roll gap difference.(1) Analysis is taken on the deviation state in the1st and2nd stand of the four-high mill, simulation that takes roll gap difference as variable of adjustment is conducted.(2) Thickness balance control model is established with the thickness difference as target, rolling force difference as observed quantity, and gap difference as the control variable.(3) Allocation model of roll gap difference is set up.3) Strategy for deviation control is raised with the application of the established deviation controlling model.(1) This control strategy is applied to each roll stand, and then the deviation control figure of head and tail in each stand is obtained. The deviation control figure gets analyzed, and the soundness of the deviation control strategy is proved.(2) Feed-back model of deviation is applied to each stand, and it has a good effect on the deviation control.(3) Based on the rolling force difference data Self-developed hi-tech deviation control system for hot continuous rolling is established, which can provide core services in aluminum rolling production,.4) Based on the study of deviation control, with the finite element analysis software MSC. Marc, the influence that back tension change has on the deviation in aluminum hot rolling is simulated and studied. Meanwhile, the deviation control of the tail part with disturbance of lateral asymmetrical factors, also gets simulated. Comparing of the simulation results with and without tension adjustment, a conclusion is summarized that the change of back tension can keep the strip from deviation.5) T-he Neural Network Predictive Model for deviation quantity and Neural Network Reorganization Model for the deviation quantity of tail part are built. The curve library for regression adjustment of rolling force difference is set up based on the existing data. Adaptive control strategy for the deviation of tail part is put forward. The research results are applied to the Aluminum3104production line, the control effect proves good and the goal of deviation correction is attained.
Keywords/Search Tags:Hot continuous rolling, Deviation, Model, Deviationcorrection control, Adaptive Deviation correction control
PDF Full Text Request
Related items