【正文】 Materials Quality PCS Training Rev 3 May 21 2022 61 Exercise 3 0 20 40 60 80 100 120 140 160 180 200 0 2 4 6 8 spec spec control control 0 2 4 6 8 0 20 40 60 80 100 120 140 160 180 200 spec spec control control Interpretation : Y/N _____Stable _____Capable Interpretation : Y/N _____Stable _____Capable 174。 nonconforming parts are produced –假如失控點(diǎn)情況無法解決 amp。 Materials Quality PCS Training Rev 3 May 21 2022 45 SPC Trend Rules Rule 7: 15 (or more) consecutive points are within 1 std dev of the CL 規(guī)則 7: 連續(xù) 15點(diǎn)在 1標(biāo)準(zhǔn)差內(nèi) Uses: Detects a decrease in process variation 用途 : 察覺制程變異的降低 Example: 174。 Materials Quality PCS Training Rev 3 May 21 2022 32 Exercise 2 The dataset contains defect levels for undissolved flux. The number of units inspected amp。 select Std Dev from the Statistics menu. ? Click OK. 2. Create an individuals control chart using the table of lot means amp。 Plots the standard deviation of a sample 187。 exclusion ? 超出點(diǎn)的確認(rèn)與排除 – Exclude the Outof Control (OOC) points or outliers for which there are verified/confirmed special causes from the chart – 由於顯示是特殊原因造成故將排除超出點(diǎn) – Repute the control limits, excluding the OOC points – 重新計(jì)算管制界限 – If there are fewer than 30 points remaining at any time, collect more data. It?s very important that the control limits are calculated using at least 30 subgroups. – 若資料點(diǎn)少於 30再繼續(xù)收集 . 這是很重要的 How to Setup a Control Chart? (II) Note: Refer to Appendix A for Control Charts for Limited Production, . 30 subgroups. 174。 maintain a stable process, amp。 improve process capability. 174。 Materials Quality PCS Training Rev 3 May 21 2022 12 ? Validate the puted control limits against data collected by replotting the control chart with data amp。以抽樣的標(biāo)準(zhǔn)差描點(diǎn) 187。 ranges. ? Select Control Chart from the Graph menu. ? Select Mean(thickness) amp。 the number of units containing undissolved flux were recorded over several lots. Make a p Chart for Undissolved Flux Interpret the control chart 174。 Materials Quality PCS Training Rev 3 May 21 2022 46 SPC Trend Rules Rule 8: 8 (or more) consecutive points are on both sides of the CL, but none are within 1 std dev of it. 規(guī)則 8: 連續(xù)不同側(cè) 8點(diǎn) ,沒有一點(diǎn)在 1標(biāo)準(zhǔn)差內(nèi) . Uses: Detects an increase in process variation 用途 : 察覺制程變異的增加 Example: 174。不合格品被產(chǎn)生 – per control chart RFC ? If any individual data values falls outside the process specification limits, then disposition the affected material per the requirements specified in the respective process specification or put the material onhold for engineering disposition. 174。 Materials Quality PCS Training Rev 3 May 21 2022 62 0 2 4 6 8 0 20 40 60 80 100 120 140 160 180 200 spec spec control control Interpretation : Y/N _____Stable _____Capable Interpretation : Y/N _____Stable _____Capable Exercise 3 0 2 4 6 8 0 20 40 60 80 100 120 140 160 180 200 spec spec control control 174。 Materials Quality PCS Training Rev 3 May 21 2022 60 Stability vs. Capability ? A process is said to be in statistical control when the only source of variation is of natural causes, (. no special causes variation present) ? A process is said to be capable – when variation from natural causes is reduced such that it can meet product specification tolerance – when the control limits are well within the specification limits ? A process is said to be not capable if the control limits are outside the specification limits 174。 Materials Quality PCS Training Rev 3 May 21 2022 51 Treatment of OOC Points ? The corresponding equipment shall be shutdown ? 相關(guān)的設(shè)備應(yīng)停機(jī) – if the OOC situations cannot be solved amp。 Materials Quality PCS Training Rev 3 May 21 2022 44 SPC Trend Rules Rule 6: 4 out of 5 consecutive points on the chart are more than 1 std dev away from the CL 規(guī)則 6: 連續(xù)同側(cè) 5點(diǎn)中 ,4點(diǎn)超出 1標(biāo)準(zhǔn)差 Uses: Detects moderatesized changes 用途 : 察覺中度改變 False alarm rate: % 機(jī)率 : % Example: 174。 Materials Quality PCS Training Rev 3 May 21 2022 31 Open the dataset . ? Select Control Chart from the Graph menu. ? Select % Defectives as the Process variable. ? Select Lot as the Sample Label variable. Verify option settings. ? Chart Type is “IR”. ? Individual Measurement box is selected. ? Moving Range box is not selected. ? Ksigma is selected, and K = 3. ? Range Span = 2. Click on OK. Example of Computing Control Limits for p Chart 174。 select Mean from the Statistics menu. Then, highlight Thickness amp。顯示抽樣平均值的改變 – S Chart 187。 plot them on the trend chart ? 計(jì)算管制界線並畫在圖上 ? Outliers identification amp。 people employed to attain process specification – 結(jié)合機(jī)器 ,治工具 ,方法 ,材料與人員來達(dá)到制程規(guī)格 – A similar procedure/event that is happening repetitively – 重覆發(fā)生的事件 /類似程序 ? Control 管制 – To keep something within a desired condition – 使某事 /物保持在想要的情況 – Make something behave the way we want it to behave – 使某事 /物依我們所想的來執(zhí)行 The use of statistical techniques such as control charts to analyze a process, take appropriate actions to achieve amp。 Materials Quality PCS Training Rev 3 May 21 2022 5 What is Stability? ? A process is said to be Stable if it has the following properties: ? 下列特性稱為穩(wěn)定 : – Pattern appears random 隨機(jī)出現(xiàn) – Constant process mean 平均值一定 – Uniform variability over time 變異程度不隨時(shí)間改變 – No trends, runs, shifts, erratic ups amp。 new control limits – Do the limits detect known problems? – 界限可以查覺已知的問題嗎 ? – Are the limits too sensitive? Would they flag problems you do not know how to react to? – 界限是否太敏感 ? 是否有問題你不曉得如何處理 ? ? Use the control limits established to monitor the critical parameter identified ? 使用建立的管制圖來追蹤確認(rèn)重要參數(shù) ? For each parameter, every m