Modeling method of plate rolling in online control model
A technology of control model and modeling method, which is applied in rolling mill control devices, metal rolling, metal rolling, etc., can solve the problems of long calculation time of finite element method, achieve online fast calculation and control, reduce the number of iterations, Guarantee the effect of convergence speed and stability
Inactive Publication Date: 2009-12-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0003] In order to make up for the accuracy and adaptability of the traditional plate rolling on-line control model in the prior art, make full use of the advantages of high precision and strong applicability of the finite element method, and solve the shortcoming of the long calculation time of the finite element method, the technical problem to be solved by the present invention It is a modeling method to provide a plate rolling online control model that can effectively realize online control
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[0044] In the plate rolling process, since the deformation in the plate width direction relative to the rolling direction is very small and negligible, it can be treated as a plane strain problem. According to above characteristics, the inventive method realizes through the following steps:
[0045] 1. Establish a two-dimensional plane strain rolling model.
[0046] According to the symmetry of the plate rolling process, the upper half of the plate rolling is taken as the research object. The established finite element model of the plate rolling process is shown in figure 1 shown. In the figure, R is the radius of the roll, h0 is the half-thickness at the entrance of the rolled piece, h1 is the half-thickness at the exit of the rolled piece, α is the rolling bite angle, OC is the center line of the plate as the x-axis, OA is the thickness direction of the plate as the y-axis, β is the contact angle.
[0047] The next steps are as follows figure 2 As shown, it is a fast c...
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The invention relates to a modeling method of plate rolling in an online control model, which carries out the modeling by a rigid-plastic finite element method. The modeling method comprises the following steps: taking a central line of a plate as an x shaft and the thickness direction of the plate as a y shaft to build a two-dimension plane strain rolling model; inputting rolling conditions and parameters; dividing finite element grids in a rolling deformation region at the lower side of the rolling contact region by adopting a quadratic element and carrying out finite element pretreatment; setting the initial speed field of the finite element; building a rigid-plastic finite element energy functional by taking the initial speed field as an initial value, iterating and solving a minimum value point of the energy functional by adopting the damping Newton method, and obtaining the actual speed field; calculating the strain field and the strain field according to the actual speed field, further calculating online control parameters of the rolling force, the rolling torque and the forward slip value, and obtaining the plate rolling model. The invention improves the calculation speed of the finite element, realizes the online rapid calculation and control of the rigid-plastic finite element of the plate rolling and has strong antijamming capacity and good stability.
Description
technical field [0001] The invention relates to an on-line control modeling technology for plate rolling in the technical field of steel rolling, in particular to a modeling method for an on-line control model of plate rolling that uses a rigid-plastic finite element method to calculate rolling control parameters on-line. technical background [0002] The development of plate rolling technology in the field of steel rolling technology puts forward higher requirements for the accuracy, applicability and reliability of the control model. Generally, the on-line control model of plate rolling is established by mathematical analysis or energy method. The control model is simple and easy to calculate quickly on-line. In recent years, in order to improve the accuracy of the control model, the neural network method has been applied to the on-line control of plate rolling. However, due to the complexity of the strip rolling process, its control accuracy is affected by deformation pa...
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IPC IPC(8): G05B13/04G05B13/02B21B37/00
Inventor 张光亮张士宏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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