工序能力講義-資料下載頁
2025-05-07 07:29本頁面
【導(dǎo)讀】假設(shè)你在監(jiān)控一個變量Supposeyou. 變量處于統(tǒng)計(jì)狀態(tài)控制下。公司已發(fā)布了變量的規(guī)格及標(biāo)準(zhǔn)。此單元解釋并回答這個問題。程序的改進(jìn)并不是說使程序變?yōu)榻y(tǒng)計(jì)狀態(tài)控制之下。工序能力是衡量程序符合標(biāo)準(zhǔn)或客戶規(guī)格是否有效率的方法之。屬性數(shù)據(jù)有兩種類型：是/否及計(jì)算。95%的及時交貨能力。月就會發(fā)生3宗投訴。在處理屬性數(shù)據(jù)時，肯定會有不合格品。如從沒有不合格品，那么以最近出貨為。使用可變數(shù)據(jù)，因?yàn)槠涫褂妙l率比較高。而不是通過分揀，或重新生產(chǎn)的。知道是否取樣和建立昨天的、今天的、或明天的產(chǎn)品的柱狀圖，對于受統(tǒng)計(jì)控制及普通式分布的程序，我們可作工序能力分析。工序能力指數(shù)Cp和Cpk是兩個具有代表性的指數(shù)。司規(guī)定，你的體重應(yīng)在139至175磅之間。Joe，5英尺9英寸高，用他個人圖表對他的體重進(jìn)行追蹤。每周稱一次體重。他想知道時否他的體重符合保險(xiǎn)公司的標(biāo)準(zhǔn)?？刂茍D表顯示Joe的“體重”過程受控。正重量的假想值。他個人體重的偏差可以從圖表的范圍內(nèi)偏離
【正文】 .41 0 9 6 14 .01 2 47 .61 9 2 5 14 .69 1 48 .80 8 7 4 15 .39 0 50 .00 7 2 3 16 .11 Calculate Cpu and Cpl. If either are less than zero, use this table to determine the % out of spec. If both are less than zero, add the results together to determine the total % out of spec. 28 Cpk 練習(xí)題 Exercise ? A manufactured part has the following length specs: USL = inches, LSL = inches. ? The process is in control with an average of inches and a standard deviation of .0015 inches. ? What is the value of Cpk的值等于多少呢 ? Is any material being produced out of specifications? 如果是的話，值為多少呢 If so, how much? ???? 3 XU S LCpu???? 3 L S LXCpl% of parts not meeting the standard = Cpk = Minimum (Cpu, Cpl)= 29 Cpk 練習(xí)題 Exercise ? 廠商定于回復(fù)客戶投訴最多需要 10天。而客戶投訴的數(shù)據(jù)表明僅需要 ,平均起來 ,用 。程序能符合標(biāo)準(zhǔn)的天數(shù)嗎？如果不是的話，客戶投訴的多少 %不符合標(biāo)準(zhǔn)？ A manufacturer has set a maximum of ten days to respond to a customer plaint and fix the process that generated the plaint. Data on customer plaints indicate that it takes, on average, days to respond to the plaint with a standard deviation of . Is the process capable of meeting the standard of 10 days? If not, what percent of the customer plaints are not meeting the standard? ???? 3 XU S LCpu ????3L S LXCpl% of customer plaints not meeting the standard = Cpk = Minimum (Cpu, Cpl)= 30 Cpk 練習(xí)題 Exercise ? 機(jī)械工廠正用個體圖表監(jiān)控每周 %的生產(chǎn)率。個體圖表是受控的。平均數(shù)是 %,標(biāo)準(zhǔn)偏差為 。最小規(guī)格是 85%。機(jī)械工廠能否符合規(guī)格？多少百分比的周不符合規(guī)格？ A machine shop is monitoring % productivity on a weekly basis using an individuals chart. The individuals chart is in control. The average is % with a standard deviation of . The minimum specification is 85%. Is the machine shop capable of meeting this specification? What % of the weeks does not meet the specification? ???? 3 XU S LCpu ???? 3 L S LXCpl% of weeks not meeting the standard = Cpk = Minimum (Cpu, Cpl)= 31 Cpk 練習(xí)答案 Exercise Answers ???3XU S LC p u???3L S LXCp l % not meeting the standard Cpk .89 .83 .48 None None .89 .83 .48 Part Complaints Machine Shop 32 概要 Summary ? 本單元主要介紹工序能力 This module has introduced process capability. ? 對于屬性數(shù)據(jù)來講，受控的平均值為工序能力。程序必須受統(tǒng)計(jì)控制。 For attributes data, the average on the control chart is the process capability. The process must be in statistical control. ? 對于可變數(shù)據(jù)來說，工序能力并不能被確定，除非程序受統(tǒng)計(jì)控制和個別測量法處于正態(tài)分布。 For variables data, process capability cannot be determined unless the process is in statistical control and the individual measurements are normally distributed. ? Cpk 值近似于可變數(shù)據(jù)工序能力的測量方法。 Cpk values are the appropriate measure of process capability for variables data. 33 應(yīng)用 Applications ? 想一想我們在工作中的程序。什么樣的程序的 Cpk 值可被確定和監(jiān)控。在下面記錄你的答案。 Think about your processes at work. For what processes should Cpk values be determined and monitored? Record your responses below
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