Multi-objective optimization method for injection molding process parameters of glass fiber reinforced plastics

Abstract

The invention discloses a glass fiber reinforced plastic injection molding process parameter multi-objective optimization method, which aims at solving the two objective optimization problems of warping and volume shrinkage of a glass fiber reinforced plastic part, and comprises the following steps of: firstly, obtaining a plurality of reasonably distributed sample points by adopting a Latin hypercube sampling method in a design variable space range; carrying out analog simulation through Moldflow software to obtain a warping value and a volume shrinkage rate of each sample point; establishinga nonlinear mathematical model between the process parameters and the quality target by adopting an extreme learning machine model based on a genetic algorithm; optimizing the two target problems byadopting a multi-target firefly algorithm; and finally, an optimal scheme and corresponding optimal injection molding process parameters are obtained through evaluation of a GRATOPSIS method includingan approximate ideal solution sorting method, entropy weight and grey correlation analysis. The optimization method can effectively reduce warping and volume shrinkage of the glass fiber reinforced plastic injection molding plastic part.

Description

technical field [0001] The invention relates to an injection molding process parameter optimization method, in particular to a multi-objective optimization method for glass fiber reinforced plastic injection molding process parameters based on GA-ELM, MOFA and GRA-TOPSIS, and belongs to the technical field of injection molding processing. Background technique [0002] Glass fiber reinforced plastics are based on the original pure plastic materials by adding glass fibers and other additives, thereby increasing the use range of plastic materials. Glass fiber reinforced plastics have the advantages of high temperature resistance, high strength, strong impact resistance, and good flame retardancy. Therefore, in general, most glass fiber reinforced plastic materials are mostly used in structural parts of products as structural engineering materials. Common glass fiber reinforced plastics include PP, ABS, PA66, PA6, PPS, etc. [0003] The addition of glass fiber will not only red...

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Problems solved by technology

At present, in the multi-objective optimization research of injection molding process parameters, researchers often determine the final Pareto optimal solution based on engineering experience and repeated experiments. Therefore, how to determine the optimal trade-off for the optimization of injection molding process parameters of glass fiber reinforced plastic plastic parts In order to achieve the best comprehensive purpose, it is still a difficult problem in the industry

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