Variable-convexity roller type self-adaptive design method based on genetic algorithm

Abstract

The invention relates to the technical field of roller type design, in particular to a variable-convexity roller type self-adaptive design method based on a genetic algorithm. The method comprises thefollowing steps: performing x-direction equidistant sampling on all roll curves in an initial roll curve population to generate an initial discretized roll curve; establishing a fitness function of the convexity control capability by taking the linearity of the convexity and the roll shifting amount as an index; establishing a fitness function of roller abrasion according to the abrasion characteristics of the hot rolling working roller; constructing a roller comprehensive fitness function according to the fitness function of the convexity control capability and the fitness function of the roller wear; and in combination with a roller comprehensive fitness function, performing iterative optimization on the initial discretized roller type curve by adopting a genetic algorithm, and taking the roller type curve obtained by iterative optimization as an output roller type curve. The roller type designed by the method can improve the convexity adjusting capacity and the abrasion resistanceof the roller, effectively prolong the service life of the roller and effectively improve the plate shape control capacity of the roller.

Description

technical field [0001] The invention relates to the technical field of roll profile design, in particular to a genetic algorithm-based self-adaptive design method for variable crown roll profiles. Background technique [0002] Roll profile curve is one of the important factors affecting sheet forming precision and surface quality, and the roll profile design of variable crown roll is a hot spot in roll analysis. Variable crown roll shape, that is, axial displacement variable crown roll shape, this roll shape can make the crown change continuously during the axial movement process, so as to improve the shape control performance. As a mature and applied roll type, the variable crown roll type has a long history of technical development. Among them, the CVC roll profile, as the most common variable crown roll profile, was invented by the German SMS company and was applied to domestic steel production lines as early as the 1980s. [0003] The axial traversing distance of the C...

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Problems solved by technology

[0003] The axial traversing distance of the CVC roll type has a linear relationship with the quadratic equivalent crown, but for different strip widths, especially narrow strips, the crown adjustment ability of the CVC roll type decreases, and cannot adapt to the same production line Production requirements for different strip widths

And compared with conventional rolls, the service life of variable crown rolls has a certain decrease. How to improve the service life of rolls under the premise of improving the crown adjustment ability of variable crown rolls is an important demand in metal rolling forming.

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