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JMP Blog

A blog for anyone curious about data visualization, design of experiments, statistics, predictive modeling, and more
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Ritalv
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浅析SPC之異常分析

因應未來能源短缺及資源匱乏,各個國家都在尋求替代能源以避免發生無資源可用的情況。汽油替代能源-生質酒精由此得到了廣泛的應用。

 

生質酒精屬於生質燃料(Biofuel)的一種,是經由生物或化學轉換成生物質(biomass)而取得的原料,它能夠延長零件使用壽命,可有效提高汽油的抗爆指數。 如果與汽油混合濃度夠低,可以直接使用。目前汽車燃料已經有使用乙醇與汽油混合的情況,並在某些汽車公司推出的車款中得到應用。

u=188500686,463535968&fm=214&gp=0.jpg

今天來淺談JMP使用 SPC管控找出異常因子並比較改善前後的表現。下圖顯示的是製造乙醇的流程圖,實例如下,有一乙醇生產工廠目前發現產量不穩定,以及製程能力出現問題,想要了解是甚麼階段出了問題。


發酵製程

发酵工艺.png

首先經由各部門頭腦風暴並使用魚骨圖找出相關的因子,指定父項和母項為何,根據人機料法環的分類,找出可能因子,底下為示意圖(非發酵製程)JMP並提供將編輯後的魚骨圖另存到資料表中,省去再次編輯的工作。

 

魚骨圖

因果图.png

 

另存到新的表格

JMP提供了将编辑后的鱼骨图另存到数据表中的功能,省去再次编辑的工作.png

經由管制圖比對發現清洗製程下,溫度的控制不穩定。並經由變異性圖分析,將可能影響的因子放入X,觀察何種因子可能為顯著因子,進而找出造成變異的特殊原因,並搭配圖形生成器比較顯著因子的變化。

 

變異性圖

变异性图.png

 

圖形生成器

图形生成器.png

    

由圖形可看出各個作業員間存在差異性,藉著進行變異數檢定分析以及ANOVA分析,確定線上作業人員操作是否具差異性

 

變異數檢定分析及平均值比較

变异数检定分析及平均值比较.png

 

根據分析的結果,產線人員間存在明顯差異,需要對人員進行再教育,經由後續資料收集比較,並使用SPC管制圖觀察訓練前後的結果

使用SPC控制图观察训练前后的结果.png

經由比較人員訓練前後的表現,很明顯發現製程變穩定,雖然還有改進的空間,但是可以再針對超出管制界限的異常點進一步分析。

 

我們可以發覺JMP在執行異常分析時,相關工具以及分析方法可以很快協助工程師找出異常,這些分析並不需要複雜的手法以及艱深的理論即可執行,在實際的應用上參數會更多更複雜,不過執行的流程是一致的,經由品質工具應用,了解製程並改善製程,進一步生產出達到客戶要求的產品,而JMP就是能達成此目地的必備工具。你也可以下載 JMP 30天免費試用版試試看。

Last Modified: Dec 10, 2019 2:50 AM