Prediction model and experimental study of weld line strength in fiber reinforced injection molding
The weld line is a crucial factor influencing the strength of injection molding products.However,the current mechanical model that predicts weld line strength based on converging angle fails to consider the impact of the injection molding process.In order to scientifically and quantitatively understand the variation law of the regional strength of the fuse connection and accurately predict the mechanical properties of the fuse connection,injection molding simulation analysis on the products with fan-shaped holes was firstly carried out,and the effects of injection molding temperature,injection rate and holding pressure on the converging angle of fusion line were studied.The results show that the injection molding temperature and holding pressure do not affect fusion line strength by changing the melt front converging angle.Based on this,in order to comprehensively reflect the influ-ence of injection molding process and converging angle on weld line strength,the prediction model reflecting the influence of injec-tion molding process and converging angle on weld line strength was reconstructed by introducing injection molding process influ-ence factor.By designing and manufacturing an injection mold for molding fan-hole products,injection molding experiments of 30wt%long glass-fiber reinforced polypropylene fan-shaped hole products under different technological conditions were carried out.Based on the experimental results,the mathematical expression of the injection molding process influence factor reflecting the effects of injection temperature and holding pressure was derived,the relevant parameters in the model through data fitting were determined.The regression analysis of weld line strength prediction model shows that the strength model established can accurately predict the tensile strength of weld line at different positions under different injection molding conditions.
weld lineconverging angleweld line strengthfiber reinforcedinjection molding
NETL
NSTL
万方数据
