资源描述
SPC-advanced training course,X-R,操作图,過程操作,a),計算及繪畫操作限,-樣本容量低於7時，極差並沒有,LCL,解释操作图,U CL,LCL,Avg,U CL,LCL,Avg,Change in level,Change in variability,解釋操作圖,-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。,-再計算操作限。,操作上限,(,UCL),中線,操作下限,(,LCL),操作上限,(,UCL),中線,操作下限,(,LCL),受控過程,不受擯過程,UCL,LCL,A,A,B,C,C,B,UCL,LCL,A,A,B,C,C,B,UCL,LCL,A,A,B,C,C,B,UCL,LCL,A,A,B,C,C,B,Test 1.One Point Beyond Zone A,Test 2.Nine Points in a Row,on One Side of the Center Line,Test 3.Six Points in a Row Steadily,Increasing or Decreasing,Test 4.Fourteen Points in a Row,Alternating Up and Down,x,x,x,x,x,x,操作图失控检验,UCL,LCL,A,A,B,C,C,B,UCL,LCL,A,A,B,C,C,B,UCL,LCL,A,A,B,C,C,B,UCL,LCL,A,A,B,C,C,B,Test 5.Two Out of Three Points in,a Row in Zone A or Beyond,Test 6.Four Out of Five Points in,a Row in Zone B and Beyond,Test 7.Fifteen Points in 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 C,x,x,x,x,x,x,x,操作图的失控检验,UCL,LCL,A,A,B,C,C,B,操作图失控检验,One point above UCL,Two out of three successive point here or above,Four out of five successive point here or above,Seven out of eight successive point here or above,One point above LCL,Two out of three successive point here or bellow,Four out of five successive point here or bellow,Seven out of eight successive point here or bellow,3,s,2,s,1,s,-3,s,-2,s,-1,s,0,34.1%,13.6%,34.1%,13.6%,2.2%,2.2%,0.1%,0.1%,2,0,1,0,0,O,b,s,e,r,v,a,t,i,o,n,N,u,m,b,e,r,UCL,LCL,2,0,1,0,0,O,b,s,e,r,v,a,t,i,o,n,N,u,m,b,e,r,UCL,LCL,Seasonal 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 almost 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 same chart.,操作图的趋势判断规则,2,0,1,0,0,O,b,s,e,r,v,a,t,i,o,n,N,u,m,b,e,r,UCL,LCL,1,5,1,0,5,0,O,b,s,e,r,v,a,t,i,o,n,N,u,m,b,e,r,UCL,LCL,Changes 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:,Continuous trending on the same direction.These are usually caused by component wear among others.,操作图的趋势判断规则,2,0,1,0,0,O,b,s,e,r,v,a,t,i,o,n,N,u,m,b,e,r,UCL,LCL,“,White Space”:,Points tend to cluster around the mean.Usually caused by:(1)incorrect control limits(overestimating process variability),(2)continuous improvements paying-off.Limits should be recalculated when this situation is found.,操作图的趋势判断规则,製 程 控 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.在操作圖中，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。,Example of OCAP in W7PT,谢谢观看,/,欢送下载,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,
展开阅读全文