Modeling And Simulation For Hydraulic System Of Internal Circulation Two-platen Injection Molding Machine

‘Precision, Cleanliness, Saving and Benefit’ become the themes of the development of the injection molding machine. The internal circulation of two-platen injection molding machine has the advantages of clamping performance, high efficiency and energy saving. This fully reflects the themes of the development of the injection molding machine. In China, the research and development of the internal circulation two-platen injection molding machine is still in the exploratory stage. Some existing relevant technologies are still very immature. The existing machines generally have some defects such as complicated structure, poor stress balance, unstable operation and maintenance difficulties etc. The traditional research has long design cycle, high cost and low efficiency. This already can’t satisfy the requirements of the quickness and diversity of modern design. The application of computer simulation technology can shorten the design cycle, save manpower and raise productivity. The software AMESim is used to research the internal circulation two-platen injection molding machine in this paper.First, the internal circulation injection molding machine was analyzed in experiment. Through setting different working conditions and gathering the actual operation data of the machine, we can get the curve of clamping oil cylinder pressure, the curve of platen displacement and the curve of the pump outlet pressure. The experimental test results can be compared with the subsequent results of numerical simulation analysis. We can verify the reliability of numerical simulation, analyze the influencing factors for the differences and lay a foundation for the subsequent numerical simulation and structure optimization.Second, the internal circulation hydraulic clamping system model was set up in the software AMESim. Through simulation, we can get the curve of platen displacement, the curve of the clamping oil cylinder pressure and the cure of the speed of platen, etc. and study the motion regulation of the mold closing. The performance of the hydraulic system was predicted. The factors of influence on the speed of mold opening and the stability and reliability of clamping action can be analyzed. Then the hydraulic system was optimized.Finally, the energy consumption of the internal circulation two-platen injection molding machine was calculated based on AMESim. Through reducing one-way valve, changing the action sequence of the hydraulic valve, changing the rod diameter of the cylinder piston rod and using the accumulator, the former system was improved to make it reach the purpose of saving energy and reducing consumption. The results showed that the energy consumption had been reduced by 26.7% by reducing one-way valve. The energy consumption couldn’t be reduced by changing the action sequence of the hydraulic valve. But the curve showed that when the system relieved pressure, the oil achieved the function of inner loop through the internal circulation valve. Changing the rod diameter of the cylinder piston rod showed the lowest energy consumption is when the rod diameter is 95 mm. The energy consumption had been reduced by 26.7% by using the accumulator. Then, the new type hydraulic system in patent technologies was simulated. The simulation results show that the energy consumptions of the new system was reduced by 39.62%. The new system is of great significance in the practical engineering application.