Optimization and Experimental Validation of Aluminum Alloy Plate Hot-rolling Based on Constraint of Warpage Threshold

doi:10.3969/j.issn.1000-1093.2020.08.017

Abstract

Abstract: The snake-like hot-rolling can divide the casted coarse grains into the machined microstructures by completely deforming the center of aluminum alloy plate. It is the key to prepare the thick aluminum alloy plates. Therefore, the warpage and its control in the process of snake-like rolling are studied. The mechanism model of hot-rolling of aluminum alloy plates is studied, and a finite element model is reasonably established for some training samples of neural network. The accuracy of the proposed model is verified by comparing the simulated and measured results. The maximum relative errors of stress and strain are 6.92% and 7.33%, respectively. Moreover, there exists about 13% relative error of warp factor. And a coupled prediction model of equivalent strain and warp factor is proposed according to the finite groups of training samples. The coupled prediction model is able to predict the simulated results within 6 % error margin. Under the condition that the warp factor is not more than the given threshold value, an optimal model with the objective of maximum equivalent strain is proposed for the rolling parameters. When an individual fitness is constructed to be a function of the average equivalent strain, the genetic algorithm can be used to solve the optimal model for rolling parameters. The proposed method can be used not only to improve the simulating calculation efficiency of rolling process, but also provide a basic theory of design and selection of rolling parameters. The propose method can not only improve the calculation efficiency of simulation of rolling process, but also provide a basic theory of design and selection of rolling parameters.

Key words: aluminumalloyplate, snake-likehotrolling, velocityratio, wrapthreshold, coupledprediction, geneticalgorithm

CLC Number:

TG335.11

YE Haichao, FAN Wulin, QIN Guohua, LIN Feng, ZHENG Xu, YANG Yang. Optimization and Experimental Validation of Aluminum Alloy Plate Hot-rolling Based on Constraint of Warpage Threshold[J]. Acta Armamentarii, 2020, 41(8): 1623-1632.

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