Rolling force prediction method in thick plate rough rolling stage

Abstract

The invention discloses a rolling force prediction method in a thick plate rough rolling stage. The method includes the steps that (1), in an error triangle on a Pi plane, an apothem linear combination yield criterion is built through an Mises criterion yield radius and the Tresca trajectory apothem; (2), the specific plastic power in the material yield process is calculated according to a flowing criterion; (3), a thick plate rolling velocity field is determined through an overall weighted average method; (4), internal deformation power, friction power, shearing power and the total power are solved through the specific plastic power and the rolling velocity field; (5), a rolling force prediction model in the thick plate rough rolling stage is built based on the total rolling power extreme value, and the rolling force in the thick plate rough rolling stage is predicated according to the rolling force prediction model. By means of the rolling force prediction method, the rolling force in the thick plate rough rolling stage can be accurately predicated, optimization of intensity check and process parameters of a rolling mill can be guided in a quantitative manner, and it is guaranteed that a thick plate product can be rolled stably.

Description

technical field [0001] The invention relates to the technical field of thick plate manufacturing, in particular to a method for predicting rolling force in the rough rolling stage of a thick plate. Background technique [0002] Heavy plate manufacturing is a symbol of the level of national iron and steel equipment, and it is also a reflection of the country's industrialization level. As an indispensable steel product, thick plates are widely used in the manufacture of components such as oil pipelines, boiler plates, bridge plates, and offshore platforms. In recent years, in order to meet the needs of national defense and economic development, the specifications of thick plates have been continuously increased, and the performance requirements have been continuously improved, and the requirements for the capacity of rolling mills have become higher and higher. In order to ensure that the rolling mill can smoothly roll out high-quality products, it is necessary to check the s...

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Problems solved by technology

[0003] Kobayashi Shiro and Kato Kazunori both studied the three-dimensional rolling process of thick plates, but due to the complexity of the quadratic equation of the deformation zone interface and free surface and the nonlinearity of the Mises yield criterion, only numerical solutions were obtained.

Because the numerical results are difficult to quickly calculate online, it is difficult to obtain industrial applications for existing technologies

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