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2018

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04

Major breakthroughs have been achieved in the research and development of gas-assisted injection molding technology in our country.

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Recently passed acceptance in Nanchang, presided over by the Jiangxi Provincial Department of Science and Technology. The successful development of this project has laid a solid theoretical and experimental foundation for promoting the progress of injection molding technology in China and improving the gas-assisted injection molding process for plastic product enterprises. Experts believe that this project has pioneered relatively mature theoretical and experimental research on gas-assisted injection molding at home and abroad, establishing a mathematical model of the gas-assisted injection molding filling process for three-dimensional thin-walled parts. The independently developed gas-assisted injection molding injection control system software based on the Windows platform is highly practical and can simulate the injection molding process to identify molding process defects in advance. At the same time
  Recently passed the acceptance organized by the Jiangxi Provincial Department of Science and Technology in Nanchang. The successful development of this project has laid a solid theoretical and experimental foundation for promoting the progress of injection molding technology in China and improving the gas-assisted injection molding process for plastic product enterprises.
  Experts believe that this project has pioneered relatively mature theoretical and experimental research on gas-assisted injection molding at home and abroad, establishing a mathematical model of the gas-assisted injection molding filling process for three-dimensional thin-walled parts. The independently developed gas-assisted injection molding gas injection control system software based on the Windows platform is highly practical and can simulate the injection molding process to identify molding process defects in advance. At the same time, experimental research on the key factors of gas-assisted molding—the formation and influence of the gas cushion layer—was conducted on independently developed experimental equipment. Three-dimensional, non-isothermal viscoelastic numerical simulation of gas-assisted extrusion under different cross-sectional die geometries, process parameters, and material parameters was performed, obtaining various field quantity distributions. The gas-assisted injection molding experimental device established based on this successfully realized gas-assisted extrusion, with a large gas-assisted pressure control range and small relative error.
  In addition, through theoretical and experimental research on the CAE analysis of the filling flow process during gas-assisted injection molding and the molding process and product defects, this project has determined the relationship between the apparent and intrinsic quality of gas-assisted injection molded products and the gas-assisted injection mold structure, operating process parameters, and material parameters. It has subsequently proposed guidelines for mold design, process route development, and operation, and has developed a gas injection device and corresponding control system, proposing a variable integral-incomplete differential-dead zone multi-modal intelligent PID tracking control algorithm. Experts pointed out that the research results of this project have reached the internationally advanced level and that the gas-assisted injection molding machine should be further improved to achieve industrialization as soon as possible. Research shows that compared with traditional processes, using this gas-assisted technology reduces the die pressure drop by 20% to 30% in production, and the extrusion expansion rate is reduced from 10% to 28% to less than 1%.
  Currently, this gas-assisted injection molding device and technology has been put into operation in many plastic product companies in Jiangxi Province, with significant results. It can produce complex thin-walled products that were previously difficult using traditional injection molding machines, becoming an updated and upgraded product for the technological transformation of traditional injection molding machinery.

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