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成品不完全(Short shot) 魚骨圖
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成品不完全(Short shot) 魚骨圖
1.
成型不良原因及對策
2.
成型不良原因及對策 成型不良可能發生在機器性能、 模具設計或原料特性,大部分的問 題可以靠調整成型條件來解決。 調整注意事項: A.每次變動1個因素,見到結果 再變動下個因素。 B.按照優先次序表來調整因素。 C.調整後須觀察5-10模,待操作 平衡穩定後的結果才算數。
3.
充填不足 short shot 現象:在成品上產生缺角 原因:塑料注入模穴內,末端 尚未填滿之前產生冷卻 固化現象或是塑料本身 流動性不良,計量不足, 模內排氣不良,流動阻 抗太大,鎖模力不足, 均會產生此現象。
4.
塑料原料 成型技術 產品模具 成型機 重開模具溢口位置 酌加潤滑劑 提高料管溫度 加大澆口 適當位置 加排氣孔 拆除檢查更新 更換較大機器 用模流分析軟體 來查明改善 提高模具溫度 增多計量行程 加快射出速度 增長射出時間 重整模具水管 提高射出壓力 拆除清理 如何解決 充填不足 問題 過膠圈 磨損 塑料原料 成型技術 產品模具 成型機 原料 溫度太低 射出壓力太低 原料 內潤滑劑不夠 澆口太小 模具排氣不良 模具溫度太低 模具溫度不均 射嘴阻塞 射出計量不夠 射出速度太慢 射出時間太短 機器 射膠量不夠 進膠不均勻 模具流道不均 充填不足 (short
shot) 成型不良原因及對策 -充填不足(short shot)
5.
調整的優先次序表 1 8 射出計量 射出壓力、料管溫度 射出速度及時間 二次射出壓力、二次射出時間 模具溫度 背壓 溢吸澆道大小及位置、脫模油使用 清理射嘴、檢修料管 2 3 4 5 6 7 增加調整 檢查修正
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