Three-Dimensional Numerical Simulation Of Reversible Vertical And Horizontal Rough Rolling

To improve the precision of the width control and the rolling yield of the strip hot-rolling's rough rolling units, and amend the product's surface quality, this paper studies the deformation law of work-piece processed by rough rolling units. It focus on the analysis and comparison of the dog-bone material's deformation condition during horizontal rolling which provides reliable basis for making reasonable technological procedure. The hot-rolling units'field condition of Meishan Steel Industry is quoted. And the seam-defect appears at the area which in the distance of 10mm-20mm to the plate edge of rough-rolling medium billet is studied. The ANSYS10.0/LS-DYNA finite element software is used to establish the Vertical-Horizontal rolling's three-dimensional finite element model. The rolling process is simulated, the main part of this paper are the effection of blank transverse shape caused by different shapes of vertical rolls; the flow law of the corner and edge metal; the transformation law of stress and strain and temperature filed distribution of rolled piece and roll. This paper numerically simulated the five-pass reversible V-H Rolling process by using explicit dynamic method and restart method. Contrasted simulation results with field test data the error is all in the limit of tolerance which shows the rationality and feasibility of this method. Outcomes show the following results:1) When 01.5, it's thin piece, the main effect is caused by surface friction, appears to be single drum. And it also shows that the groove vertical rolls can corret twin drum so that avoiding marginal interlayer.2) We found the metal of corner and edge gradually flowed to the upper and nether surfaces; and on the same rolling process conditions, the value of side tumbling on groove vertical rolling more than the value of side tumbling on flat vertical rolling, and the value of side tumbling increases while the drum of transversal profile decrease with the increasing of the groove fillet radius.3) During rolling process, the corner and edge metal is in the status of low temperature, high strain and high stress, and gradually flow to the width centre portion of blank, original boundary and new boundaries generated in each pass gradually cumulate on the edge of the workpiece, which may bring the seam-defect along the length of the workpiece.4) Vertical roll has the ability to repair minimal defects, so that it can increase and improve the quality of the edge of strip steel. Reasonable design of the vertical roll shape and optimization of the side pressure system can effectively improve the quality of the product.