| Combined with the project "A Collaborative system for numerical design and manufacturing of products in beverage industry", the experimental study of visco-elastic properties of PET, the numerical study of stretch-blow molding process, the optimization of processing parameters and the system integration, including Gambit, Polydata and Polyflow, were studied. And a system for process variant design was developed.In Chapter 1, the paper's research background, field, target and value were discussed. Through analysing the relative reseach status both home and abroad, the conclusion came that the design of stretch-blow molding process is virtually relied on personal experience, but weak in numerical study, thus the system which can assist the process variant design is in great need in the beverage industry. Finaly the main content of this dissertation and the structure was presented.Chapter 2 discussed the technology of optimization of stretch-blow process based on simulation using FEM. The relative methods and the process of optimization of stretch-blow process based on FEM study were proposed, including the FEM numerical study and the issues of mathematic model of the viscoelastic behavior of PET.Chapter 3, the mathemitci model of the viscoelastic behavior of PET was studied. First, the design of experiment and the principles were proposed. Second, the experimental data process was discussed. Particulary, the process about how to compute to gain the relaxation spectrum to construct the mathematic model, which can explain the visco-elastic properties of PET properly, was studied.Chapter 4, the FEM simulation of stretch-blow process of PET bottles was studied. The FEM simulation consists of three aspects: geometrical model, grids construction and simulation construction. The relative methods, principles, problems and their solutions were presented. Also, a complete example of simulation was gived out. Lastly, the relation between defects and the process variants, which was concluded on the simulation results, was proposed.Chapter 5 and Chapter 6, separately discuss the system's design scheme, develop method and the application example.Chapter 7, summarize and prospect to this dissertation. |
