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    六西格瑪在提高HFW厚壁管成材率中的應(yīng)用

    Application of Six Sigma to Improving Yield of Heavy-walled HFW Pipe Production

    • 摘要: 運(yùn)用六西格瑪方法,通過排列圖、雙樣本T檢驗(yàn)、非參數(shù)檢驗(yàn)及方差分析等工具,找到了制約Φ610 mm HFW焊管機(jī)組厚壁管成材率的癥結(jié),并從成型焊接工藝優(yōu)化、內(nèi)毛刺刀桿改造等方面制定和實(shí)施改進(jìn)措施。通過實(shí)施改進(jìn)措施,Φ610 mm HFW焊管機(jī)組厚壁管的成材率提高了14.2%,成材率西格瑪水平也從改進(jìn)前的0.66提高到1.23。

       

      Abstract: The root cause that restrains yield of the Φ610 mm HFW pipe production line is identified by means of the Six Sigma Method containing such tools as Plato, Student's T test, non-parameter test, and variance analysis. Accordingly, corrective actions are determined and taken to optimize forming and welding processes, and modify inner burr cutter bar. As a result, the yield of the said production line has been increased by 14.2%, and the yield Sigma level has been also enhanced from the original 0.66 to 1.23.

       

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