應用田口方法優化醫療吊環之成形參數

Using Taguchi Methods to Optimize Molding Parameters of Medical Clip

10.6841/NTUT.2011.00244

楊明翰

醫療吊環 ； 翻轉式流道 ； 田口實驗方法 ； 變異數分析 ； Medical Clip ； Melt-Flipper technology ； Taguchi method ； analysis of variance

臺北科技大學製造科技研究所學位論文

2011年

碩士

韓麗龍

繁體中文

醫療吊環(medical clip)為醫療搬運輔助器中的一個重要零件，材質為聚醯胺(耐隆，PA)，採用射出成形的方法製造，除了需要有高的承載力外，每一個吊環的承載力也必須穩定一致。本實驗的模具設計為翻轉式流道，並應用田口實驗方法(L18直交表)規劃射出成形參數的控制因子與水準，探討成形參數對醫療吊環承載力之影響，找出提高吊環承載力的優化製程參數，最後再進行變異數分析。 實驗結果顯示，影響醫療吊環拉伸強度的顯著因子為：膠溫、第一段射速、第二段射速、保壓時間、模具溫度以及冷卻時間。而優化的製程參數為融膠溫度250 ℃、第一段射速30 %、第二段射速70 %、第二段射壓95 bar、保壓壓力25 bar、保壓時間3 sec、模具溫度40 ℃以及冷卻時間30 sec。經由確認實驗結果，原始製程的平均承載力為2.72 kN，而優化製程的平均承載力為4.35 kN，承載力提升1.63 kN。

Medical clip is an important part of Patient Handling Sling. It must be provided with high and identical bearing capacity. It was composed of PA (polyamide) and manufactured by injection molding. In this study, Melt-Flipper to research was used for the injection mold. And Taguchi method (L18 orthogonal arrays) was employed to planning the injection parameters including the control factors and its levels. The influence of injection molding parameters will affect on the tensile strength of Medical Clip. The optimize injection parameters will be investigated the tensile strength of Medical Clip. Finally, the analysis of variance was used to find the significant factors which affect the tensile strength. Results show the melt temperature, the stage-I injection speed, and the packing time are the main significant factors that affect the tensile strength of the Medical Clip. The optimizing process parameter are the melt temperature 250 ℃, the first injection speed 30%, the stage-II injection speed 70%, the stage-II injection pressure 95 bar, packing pressure 25 bar, packing time 3 sec, the mold temperature 40 ℃ and cooling time 30 sec. Through the confirmed experiments, the average bearing capacity of original process design was 2.72 kN, and the optimize process was 4.35 kN, the average bearing capacity enhance 1.63 kN.

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