Research on Gate Design of Injection Molding for Replication of Flat Plates with Micro Grooves

• Main Authors: Hui-Lun Hung, 洪慧倫
• Other Authors: Chao-Chang A. Chen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/84626389884580317899

碩士 === 國立臺灣科技大學 === 機械工程系 === 97 === Gate design is one of the most important functional structures in an injection mold, as it has a direct influence on the quality of the injected products. The gate is usually designed to regulate and control the flow direction achieves for better qualities of products. The gate location, shape and dimensions can also be considered to achieve the optimal flow and low pressure loss into the mold cavity for obtaining filling rate and the minimal warpage. This research utilizes a computer-assisted engineering software – Moldex3D R9.1 to analyze the pressure loss of filling process, packing pressure and warpage. This research aims to investigate the quality improvement of the replication of micro grooves and macro flatness in injection molding of flat plates for different gate design. A gate pressure loss function δP has been developed for gate design of flat plates with micro grooves. Experimental results show that the qualities of products can be improved while the size of gate design is 30% in width and 70% in height of part. The transfer ratio of groove (TRG) increases from 77.04% to 81.68% and the average of Non-uniformity (NU) decreases from 0.083 mm to 0.060 mm. Moreover, the results also demonstrate that the height of gate is more significant than the width of gate for replication. This research can be potentially applied to gate design of the vario-thermal molding or injection compress molding of light guide plate with micro structures in the future.