spc-advanced80-9215102.pptx

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1、SPC-advanced training courseX-R 控制图控制图SPC-advanced training course過程控制過程控制a)計算及繪畫控制限-樣本容量低於7時，極差並沒有LCLSPC-advanced training course解释控制图解释控制图U CLLCLAvgU CLLCLAvgChange in levelChange in variabilitySPC-advanced training course解釋控制圖解釋控制圖-確定是否有不受控的情況確定是否有不受控的情況 -檢查過程記錄，找出並列明任何特殊原因。檢查過程記錄，找出並列明任何特殊原因。-再計

2、算控制限。再計算控制限。控制上限控制上限(UCL)中線中線控制下限控制下限(LCL)控制上限控制上限(UCL)中線中線控制下限控制下限(LCL)受控過程不受擯過程SPC-advanced training courseUCLLCLAABCCBUCLLCLAABCCBUCLLCLAABCCBUCLLCLAABCCBTest 1.One Point Beyond Zone ATest 2.Nine Points in a Row on One Side of the Center LineTest 3.Six Points in a Row Steadily Increasing or Decre

3、asingTest 4.Fourteen Points in a Row Alternating Up and Downxxxxxx控制图失控检验控制图失控检验SPC-advanced training courseUCLLCLAABCCBUCLLCLAABCCBUCLLCLAABCCBUCLLCLAABCCBTest 5.Two Out of Three Points in a Row in Zone A or BeyondTest 6.Four Out of Five Points in a Row in Zone B and BeyondTest 7.Fifteen Points in

4、a Row in Zone C (Above and Below Centerline)Test 8.Eight Points in a Row on Both Sides of Centerline with None in Zone Cxxxxxxx控制图的失控检验控制图的失控检验SPC-advanced training courseUCLLCLAABCCB控制图失控检验控制图失控检验One point above UCLTwo out of three successive point here or aboveFour out of five successive point her

5、e or aboveSeven out of eight successive point here or aboveOne point above LCLTwo out of three successive point here or bellowFour out of five successive point here or bellowSeven out of eight successive point here or bellow3s s2s s1s s-3s s-2s s-1s s034.1%13.6%34.1%13.6%2.2%2.2%0.1%0.1%SPC-advanced

6、 training course20100Observation NumberUCLLCL201 00Observation NumberUCLLCLSeasonal Trends:These could be caused by systematic changes like:temperature,operator fatigue,voltage or pressure fluctuations,etc.Mixtures:A clear indication is when most of the points are close to the control limits,and alm

7、ost no points near the center line.These are usually due to underestimating the process variability or“over-control”,where operators intervene with the process frequently trying to respond to inherent variability instead of assignable causes.This also occurs when controlling two processes on the sam

8、e chart.控制图的趋势判断规则控制图的趋势判断规则SPC-advanced training course201 00Observation NumberUCLLCL1 51 050Observation NumberUCLLCLChanges in process means:These are usually due to the introduction of new operators,machines,procedures,etc.Can also happen because of process improvements.Upward/Downward Trends:Con

9、tinuous trending on the same direction.These are usually caused by component wear among others.控制图的趋势判断规则控制图的趋势判断规则SPC-advanced training course20100Observation NumberUCLLCL“White Space”:Points tend to cluster around the mean.Usually caused by:(1)incorrect control limits(overestimating process variab

10、ility),(2)continuous improvements paying-off.Limits should be recalculated when this situation is found.控制图的趋势判断规则控制图的趋势判断规则SPC-advanced training course製製 程程 控控 制制 對特殊原因採取的措施 1.即時分析失控情況是非常重要的，以便將不符合規格的產品減至最少；並取得新的數據作調查分析。2.特殊原因可以是正面或負面3.在控制圖中，我們可能會在任何單值子組中得到一個特殊原因的錯誤信息。SPC-advanced training courseExample of OCAP in W7PTSPC-advanced training course谢谢观看/欢迎下载BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES.BY FAITH I BY FAITH