The Study of Select the Gate Design Position and the Best Molding Parameters Used in Industrial Safety Masks

• Main Authors: JI, YING-HUI, 紀盈卉
• Other Authors: LIU, CHIA-YING
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/hzyy62

碩士 === 南臺科技大學 === 機械工程系 === 105 === In this study, an industrial safety mask (280x235x130mm) was used as an analytical example. After the flow analysis, it was found that the gate position was set at the boundary of the outer side surface, and the curve of the molded product inlet pressure was stable, which indicated that the process In the pressure tends to be stable, and the number of air traps and weld line will be relatively less, and then from the outer side of the border (up and down relative position) for eighteen groups of mold flow analysis and Taguchi experiment. There are eight factors and three levels of value in Taguchi's method control. After analysis and calculation, it is found that the optimal molding parameters are experimental number X17. The parameter value is 5 seconds (A2), the pressure is 150MPa (B3), the packing pressure is 140MPa (C2), the filling time is 1 second (D1) , The holding time 6 seconds (E3), the plastic temperature 190℃ (F1), the mold temperature 45℃ (G2), the cooling time 12 seconds (H3), and the worst forming parameter is the experiment number X13, the value is the opening time 5 seconds (A2), injection pressure 140MPa (B2), packing pressure 130MPa (C1), filling time 2 seconds (D2), holding time 6 seconds (E3), plastic temperature 190℃ (F1), mold temperature 50℃ (G3) , The cooling time of 11 seconds (H2), the two groups of experiments were compared with each other, we can find X17 total warping value decreased by at least 4.6% than X19 , while the number of weld line is less than 19.07%, but the air traps X13 and X17 is the same. From the data, it can be seen in the air traps of the two sets of experimental number of the value will not be too much difference, it can be ignored, and then by 5 times the magnification of the warpage after the comparison, the final selection of experiment number X17 is the optimal molding parameter and the surface of the molded article is smoother and less defective, which can effectively reduce the occurrence and decrease of warpage for the probability of occurrence of good products, and thus will not affect the appearance of molded products and their quality.