In flatness measurement system, the flatness measuring signal can be affected by the flatness roll deflection. The flatness roll stress was analyzed and the flatness roll deflection model was obtained by using the influence function method in this paper. The model has been developed based on the deformation of flatness roll in rolling and compensating curve has been obtained. The results indicated that the setting curve of flatness is preferably accordant with the curve of online measuring flatness, and good strip flatness can be obtained.
Welding heat cycle computer software is developed successfully, bases on experiential and practical mathematic model, uses LabVIEW7.1 to program, it can draw single or multi-process welding heat cycle curve conveniently and quickly. This paper puts emphasize on explaining the realization of multi-process heat cycle curve which is drawn by the same or different mathematic model, and the research of heat cycle curve’ change which is caused by the change of parameters. It introduces the comparison between practical curve which is obtained from experiment and settled curve after this software is embedded in MMS-200 thermo-mechanical simulator. The development of this software has important value on the research of welding process, fills up the blank of domestic thermo-mechanical simulator at the aspect of welding thermo-simulation, consummates the function of thermo-mechanical simulator, and broadens its applying field further.
. For UCM cold rolling mill, the intermediate roll shifting can enhance the ability of mill for better flatness control, but it will increase the non-uniform distribution of pressure between rolls, as result of a reduced roll life. In order to improve the contact state among rolls in rolling processes and to slow down the roll wear, the distribution of pressure between rolls under different forms of roll bending control has been calculated and analyzed by the influence function method in this paper. For the purpose of obtaining comprehensive information, not only the distributions of pressure between rolls with traditional work roll symmetrical bending and intermediate roll symmetrical bending have been analyzed, but also the distributions of pressure between rolls with non-symmetrical roll bending have been analyzed. All the analyses show that the work roll non-symmetrical bending as well as the intermediate roll non-symmetrical bending can play an important role in the slowing down of roll wear.
Vertical rolling is a vital method for width control in rolling, which has its own deformation characteristic. During the processing, plastic deformation does not go further into center of slab, only in edge where the deformation will be occurred. In this paper, an anti-symmetric parabola is creatively used to describe dog-bone shape and innovatively applied to establish a knematically admissible continuous velocity field for vertical rolling. Based on this field, an analytical form of total deformation power is obtained which is a function of reduction geometric parameters, and friction factor m, as well as parameter of A which is to be determined. With minimization of total power results in rolling forces and torque calculated by this new method is obtained. Copper and aluminum experiments conducted by S.-E.Lundberg are used to verified the results calculated by formula in present paper and compared with those by Lundberg and Duckjoongs’ models. The error is no more than 13%, (average error 7%).
Run out table cooling equipment and coiling temperature control (CTC) system, especially mathematic models of a hot strip mill were introduced. Heat transfer models such as air convection model, heat radiation model and laminar cooling model, process control models such as segment tracking model, feedback control model, self-learning model and case-based reasoning model were detailed described. Since online application of the new CTC system, the laminar cooling control system has been running stably and reliably with a high precision of coiling temperature.
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