Study On Characteristic Model Of Deformation Zone In Plate And Strip Warm Rolling Process

Iron and steel industry has long been an important industry in the national economy,and the metal strip as an important iron and steel product, has been widely used ineconomic construction. Due to high technology content and added value, the yield andratio of the plate and strip is regarded by people as one of the indicators to measure acountry’s iron and steel industry level. In recent years, under the pressure of the rise in rawmaterial prices, excess capacity, energy saving and environmental protection, searching aproduction mode, which improves the competitiveness of steel products while reducingenergy consumption and production cost, has been the development direction of the ironand steel industry. Since the warm rolling process has many advantages which exist in hotor cold rolling, such as small roll wear, high product quality, low energy consumption, itbecomes the focus of research.In his paper, the author takes strip warm rolling process as the research object. Basedon Karman rolling theory, the author, considering the changes of the workpiecedeformation resistance during deformation, establishes the model of the deformationzone’s roller circumferential profile for the strip warm rolling process. The model willprovide theoretical support and practical reference for the rolling force calculation, rollelastic flattening analysis and strip thickness control in the strip warm rolling process.First of all, the author analyses the change regulation of the workpiece deformationresistance during deformation by using the C-Mn steel warm deforming flow sress model.In the warm rolling process, the workpiece deformation resistance increases sharply atfirst and then decreases slowly, the change of the workpiece deformation resistance is sosignificantly that it must be taken into account when we analyze the strp warm rollingprocess.Second, based on Karman equilibrium differential equation, the author, taking thechange of the workpiece deformation resistance into account, establishes the workpieceequilibrium differential equation used in strip warm rolling process. Based on theworkpiece equilibrium differential equation mentioned before, the author calculates theunit rolling pressure with the application of the influence function method. Using quadratic curve to fit the unit rolling pressure distribution, the author, according to thetheory of elastic half plane, calculates the roll elastic flattening value and establishes themodel of the deformation zone’s roller circumferential profile.Finally, taking45steel warm rolling process as the object, the author uses finiteelement simulation experiment to verify the model of the deformation zone’s rollercircumferential profile for the strip warm rolling process, and the model results are inaccord with the experimented results. Using the model mentioned before, the authorsanalyzes the main process parameters’ influences on the deformation zone’s rollcircumferential profile, providing theory references on formulating strip warm rollingprocess reasonably.