Nanchang University Professor Liu Hesheng undertook the second batch of cross-century academic and technical leader training programs for major disciplines in Jiangxi Province--gas-assisted injection molding technology research and gas-assisted injection molding machine development project, recently hosted by Jiangxi Science and Technology Department in Nanchang Acceptance. The successful development of the project has laid a solid theoretical and experimental foundation for the improvement of the gas-assisted injection molding process for plastics enterprises in order to promote the advancement of China's injection molding technology.
Experts believe that the project has taken the lead in the domestic and foreign gas-assisted injection molding of more mature theoretical and experimental research, the establishment of a three-dimensional thin-walled parts of the gas-assisted injection molding process mathematical model, a self-developed set of Windows-based The gas-assisted injection molding gas injection control system software has strong practicability and can detect defects in the molding process in advance by simulating the injection molding process. According to the gas-assisted injection molding experimental device established, the gas-assisted extrusion has been successfully realized, and the gas-assisted pressure control range is large, and the relative error is small.
In addition, the project theoretically and experimentally studied the CAE analysis of the filling flow process and the forming process and product formation defects in the gas-assisted injection molding process, and obtained the apparent and intrinsic quality of the gas-assisted injection molded product and the gas-assisted injection mold structure. The regular relationship between the operating process parameters and the physical property parameters, and then the guidelines that can be used to guide the mold design, process routing and operation, and the gas injection device and the corresponding control system were developed, and the variable integral was proposed. Incomplete differentiation-multi-modal intelligent PID tracking control algorithm with dead zone. At the same time, on the self-developed experimental equipment, the key factors of gas-assisted molding--the formation and influence of air-cushion film layer were studied experimentally, and the gas-assisted extrusion of different cross-section die under different process parameters and different physical parameters Three-dimensional and non-isothermal viscoelastic numerical simulations were carried out, and various field distributions were obtained. Studies have shown that compared with the traditional process, the application of the gas-assisted technology reduces the pressure drop of the production die by 20% to 30%, and the extrusion swell rate decreases from 10% to 28% to less than 1%.
At present, the gas-assisted injection molding equipment and technology have been put into operation in many plastic products enterprises in Jiangxi Province, and the use effect is obvious. It can produce traditional thin-walled products with traditional injection molding machines, and become a new generation of traditional injection molding machinery technical transformation. . Experts pointed out that the research results of the project have reached the international advanced level, and the gas-assisted injection molding machine should be further improved to realize industrialization as soon as possible.
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