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某公司spc簡(jiǎn)介和cppp培訓(xùn)教程-資料下載頁(yè)

2025-05-24 19:08本頁(yè)面

【導(dǎo)讀】進(jìn)與保證質(zhì)量的目的。SPC強(qiáng)調(diào)全過(guò)程的預(yù)防。SPC給企業(yè)各類(lèi)人員都帶來(lái)好處。對(duì)于生產(chǎn)第一線的操作者,可用。SPC的特點(diǎn)是:SPC是全系統(tǒng)的,全過(guò)程的,要求全員參加,這點(diǎn)與全面質(zhì)量管理的精神完全一致。SPC不僅用于生產(chǎn)過(guò)程,而且可用于服務(wù)過(guò)程和一切管理過(guò)程。SPC與當(dāng)年的休哈特方法并無(wú)根本的區(qū)別。美國(guó)從20世紀(jì)80年代起開(kāi)始推行SPC。已大規(guī)模推行了SPC,如福特汽車(chē)公司,通用汽車(chē)公司,有關(guān)的行業(yè)中,頗為流行。美國(guó)鋼鐵工業(yè)也大力推行了。的一套完整的質(zhì)量體系標(biāo)準(zhǔn)。培訓(xùn)內(nèi)容主要有下列各項(xiàng):SPC的重要性,正態(tài)分。布等統(tǒng)計(jì)基本知識(shí),質(zhì)量管理七種工具,其中特別是要對(duì)控制圖深入學(xué)習(xí),兩種質(zhì)量診斷理論,如何制訂過(guò)程控制網(wǎng)圖,如何制訂過(guò)程控制標(biāo)準(zhǔn)等等。如美國(guó)LTV鋼鐵公司共確定了。將具有立法性質(zhì)的有關(guān)。步驟6:對(duì)過(guò)程進(jìn)行診斷并采取措施解決問(wèn)題。如美國(guó)率LTV公司1985年實(shí)施了SPC后,高度不等的矩形表示數(shù)據(jù)分布的圖形。傳遞過(guò)程波動(dòng)狀態(tài)的信息;

  

【正文】 大的差異? With thirty points you are under 2% in disagreement. So in industrial situations it is always to use the (n1) formula. 30個(gè)數(shù)據(jù)就會(huì)存在 2%的差異,所以在工業(yè)生產(chǎn)中,通常使用 n1的公式。 企業(yè)通用業(yè)頻道 Cp與 Pp的一些概念: 2 Most of the data we?ve collected are individual data or multiple readings for subgroup data. 我們收集的數(shù)據(jù)通常是單獨(dú)的數(shù)據(jù)或是多次測(cè)量的多組數(shù)據(jù)。 3 PROCESS CAPABILITY is defined as the 6 sigma range of a process39。s inherent variation, where sigma is usually estimated by Rbar/d2 and where inherent variation is defined as that portion of process variation due to mon causes only. 過(guò)程能力定義為 6sigma( 3sigma控制線)過(guò)程的固有偏差,這里的 sigma通常使用 Rbar/d2計(jì)算,而固有偏差則僅是一般原因造成的,為過(guò)程偏差的一部分。 PROCESS PERFORMANCE is defined as the 6 sigma range of a process39。s total variation where sigma is usually estimated by s, the sample standard deviation 過(guò)程表現(xiàn)則定義為 6sigma( 3sigma控制線)過(guò)程的全部差異,這里的 sigma是用樣本的標(biāo)準(zhǔn)差來(lái)計(jì)算的。 企業(yè)通用業(yè)頻道 Cp與 Pp的一些概念: 4 CpkProcess capability index attempts to answer the question “does my process in the long run meet specification?” CpK過(guò)程能力指數(shù)用來(lái)回答“過(guò)程長(zhǎng)期運(yùn)行時(shí)是否能滿足要求?” 5 PpkProcess performance index attempts to answer the question does my current production sample meet specification ? PpK過(guò)程表現(xiàn)能力用來(lái)回答“目前過(guò)程生產(chǎn)的樣品能否滿足要求?” 企業(yè)通用業(yè)頻道 Cp與 Pp的一些概念: 6 Long Term versus Within and Short Term versus Overall it seems antinomy. “長(zhǎng)期”“組內(nèi)”和“短期”“全部”看起來(lái)是自相矛盾的。, To my opinion, process should be stable in the long run if not we calls the alternate potential process. 在我看來(lái),長(zhǎng)期運(yùn)行下的過(guò)程應(yīng)該是穩(wěn)定的,如果不是那就稱(chēng)為潛在過(guò)程。 Meanwhile, process capability evaluation can only be done after the process is brought into statistical control, that’s to say, the process you studied is stable without BETWEEN VARIATION. 同時(shí),過(guò)程能力的研究只有在過(guò)程已處于統(tǒng)計(jì)管制之下才能進(jìn)行,也就是你所研究的過(guò)程已消除了組間差異。 企業(yè)通用業(yè)頻道 Cp與 Pp的一些概念: The reason is simple: Cpk is a prediction, and one can only predict something that is stable. And process performance indices should only be used when statistical control cannot be evaluated. 原因很簡(jiǎn)單: Cpk只是一個(gè)預(yù)測(cè),只能對(duì)穩(wěn)定的東西作出預(yù)測(cè),而過(guò)程表現(xiàn) PpK則應(yīng)該用在還沒(méi)有進(jìn)行管制的過(guò)程。 Then es to the problem or misunderstand: process in long run (potential process) only has within variation, . short term variability. Also, overall variation is equal to long term variability we often say. 于是問(wèn)題或誤解就產(chǎn)生了:長(zhǎng)期運(yùn)行下的過(guò)程(潛在過(guò)程)只有組內(nèi)變異,也就是短時(shí)間內(nèi)的變化,而總變異就是我們通常講的長(zhǎng)時(shí)間的變化。 企業(yè)通用業(yè)頻道 Cp與 Pp的一些概念: So we often assosiate CpkwithLong Term,WithinandPotential and PpKwithShort TermandOverall. 所以,我們就經(jīng)常把 Cpk與“長(zhǎng)期”“組內(nèi)”“潛在”聯(lián)系在一起,而 Ppk則與“短期”“全部”聯(lián)系在一起。 Avoid confusion of Long Term and Short Term, Even MINITAB no longer uses longterm amp。 shortterm. As of Release 13 they changed their terminology so it now associates Cpk with the descriptor Potential (Within) and Ppk with the descriptor Overall. 為了避免混淆“長(zhǎng)期”與“短期”,就連 MINITAB也不再使用“長(zhǎng)期”與“短期”, 13版本就更改了相關(guān)術(shù)語(yǔ), Cpk使用潛在(組內(nèi)), Ppk使用全部。 企業(yè)通用業(yè)頻道 Cp與 Pp的一些概念: when use Cp/CpK amp。 Pp/PpK for Cp/Cpk 1 Data from control charts 2 no less than 100 data points for Pp/PpK 1 process is chronically unstable but meeting the specifications and in a predictable pattern. 2 Data from short term(短時(shí)間) studies: a snap shot of the process 3 less than 100 data points 4 when we do PPAP
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