Optimal Multilayer Molding of Blu-Ray Pick-Up Head Lens with Neural Network Technology

• Main Authors: LIN, JIAN-JHIH, 林建志
• Other Authors: Min-Wen Wang
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/dq699t

碩士 === 國立高雄應用科技大學 === 機械工程系 === 105 === Blu-ray Disc (BD) is one of the digital video recording in the new generation which has the high-denfinition and high storage capacity. The Blu-Ray Pick-Up Head is the most important componment in the Blu-Ray player which belongs to the high thickness ratio. In the injection molding, we meet a severe problem that is shrinkage. Therefore, in this study, we use the micro injection molding technique, the multi-layer injection molding technique, Taguchi methods, Back-Propagation Neural Networks(BPNN), Genetic algorithm(GA) and Particle Swarm Optimization(PSO) to the Blu-Ray Pick-Up Head on the injection molding experiments. Besides, we also explore the impact of the molding parameters on the Blu-Ray Pick-Up Head. First, we use the Moldex3D mold flow analysis software to analye the contribution of each parameter and possible defects, then we design and produce the injection mold of Blu-Ray Pick-Up Head. In the injection molding experiment, we use Taguchi methods to find the trend and contribution of each parameters and the better forming parameters. In the end, we find the optimum forming parameters by using BPNN, GA, and PSO. The research shows: (1) The simulation results show that the cooling time of single-layer injection molding and multi-layer injection molding are 15 seconds and 10 seconds. The cooling time of the multi-layer injection molding was reduced 33%. (2) The simulation results show that the average volume shrinkage of single-layer injection molding and multi-layer injection molding are 2.440% and 1.065%. (3) The results of single-layer injection molding experiment show the factors that affect the shrinkage are mold temperature > melt temperature > injection speed > packing speed. (4) The results of multi-layer injection molding experiment show the factors that affect the shrinkage are mold temperature > injection speed > packing speed > melt temperature. (5) The results of injection molding experiment by Taguchi methods show that the better average shrinkage of single-layer injection molding and multi-layer injection molding are 2.742% and 1.746%. (6) The results of injection molding experiment by BPNN-GA-PSO show that the best average shrinkage of single-layer injection molding and multi-layer injection molding are 2.036% and 1.632%. (7) The results of injection molding experiment show that the Contour I’s average form error of single-layer injection molding and multi-layer injection molding are 6.62 μm and 4.43 μm. (8) The results of injection molding experiment show that the Contour II’s average form error of single-layer injection molding and multi-layer injection molding are 6.49 μm and 3.62 μm