China's gas-assisted injection molding technology has achieved a major breakthrough in R & D
Recently in Nanchang passed the acceptance inspection conducted by Jiangxi Science and Technology Department. The successful development of this project has laid a solid theoretical and experimental foundation for the advancement of injection molding technology in China and for the improvement of the gas-assisted injection molding process for plastic products enterprises.
Experts believe that the project took the lead in the domestic and foreign gas-assisted injection molding for more mature theoretical and experimental research, the establishment of a three-dimensional thin-walled parts of the gas injection molding process mathematical model of filling, self-developed a set of Windows-based platform Gas-injection injection molding gas injection control system software has strong practicability. It can discover defects in the molding process in advance by simulating the injection molding process. At the same time, on the independently developed experimental equipment, an experimental study was carried out on the formation and impact of the air-cushion film layer, a key factor in gas-assisted molding, and the gas assisted extrusion of different cross-section dies under different process parameters and different physical property parameters. Three-dimensional, non-isothermal viscoelastic numerical simulations were performed and various field quantities were obtained. Based on the gas-assisted injection molding experimental device established in this way, gas-assisted extrusion was successfully achieved, and the range of gas auxiliary pressure control was large, and the relative error was small.
In addition, the project conducted theoretical and experimental research on the CAE analysis of mold filling flow process in gas assisted injection molding, as well as the forming process and product formation defects, and obtained the apparent and intrinsic quality of gas assisted injection molding products and gas assisted injection mold structure. The relationship between the process parameters and the physical properties of the raw materials, and then put forward guidelines that can be used to guide the design of the mold, process route formulation and operation, and the gas injection device and the corresponding control system were developed, and the variable integral - Incomplete differential-multi-modal intelligent PID tracking control algorithm with dead zone. Experts pointed out that the research results of this project have reached the international advanced level, and gas-assisted injection molding machines should be further improved so as to realize industrialization as soon as possible. Studies have shown that compared with the traditional process, the use of the gas-assisted technology, production die pressure drop by 20% to 30%, extrusion swelling rate from 10% to 28% down to 1%.
At present, the gas-assisted injection molding device and technology have been put into operation in a number of plastic product enterprises in Jiangxi Province. The use effect is obvious. It can use traditional injection molding machines to produce thin-walled products with complex processes and become a replacement product for traditional injection molding machine technology transformation. .
The development prospect of powder metallurgy gears