spc统计-质量管理文档SPCtraining 精品

•Process
–Combination of machines, tools, methods, materials & people employed to attain process specification
–A similar procedure/event that is happening repetitively
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Control Chart
Consists of Two Portions :
X Chart
• Plots the mean of the X values in the sample • Shows the changes of the mean of one sample to another
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记录有关OOC信息
记录在表单QCM-AOR07上。
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有一点落在控制界限外；
Upper Control Limit (UCL) Center Line (CL) Lower Control Limit (LCL)
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有连续的7点递增或递减
Upper Control Limit (UCL) Center Line (CL) Lower Control Limit (LCL)
•Control
–To keep something within a desired condition
–Make something behave the way we want it to behave
The use of statistical techniques such as control charts to analyze a process, take appropriate actions to achieve & maintain a stable process, & improve process capability.
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X BAR &R CHART的控制线 &PPK
•对于X BAR CHART的控制线 •UCL/LCL=Xbarbar+/-3sigma •对于R CHART的控制线 •UCL/LCL=Rbar+/-3sigma •*进行控制线计算时， 至少已收集了25组数据。 •Ppk=(USL-Xbarbar)/3S or Ppk=(USL-Xbarbar)/3S 取较小者
R Chart
• Plots the range of a sample • Shows the changes in dispersion or process variability of one
sample to another
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Control Charts For Variables
Control Chart
•X BAR & R CHART参数计算 对于k组样本,每组抽样量均为n的数据 • Xi=(X1+X2+ ….Xn)/n (i=1 ~ k) •Ri= Xmax-Xmin(i=1 ~ k) •X BAR CHART的中心线(CENTER LINE)
X barbar =(Xbar1+Xbar2+…Xbark)/K •R CHART的中心线(CENTER LINE) R bar=(R1+R2+…Rk) /k
•按照CONTROL PLAN上规定,如WIRE PULL TEST: Once/shift, and after device change, capillary change, and after machine repair; 10WIRES/UNIT. X Bar& R CHART.
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如何计算平均值,极差
SPC TRAINING
•Statistical
SPC 统计制程控制
–Anything that deals with the collection, analysis, interpretation & presentation of numerical data
–Gaining information for making informed decisions
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通过QI监控OOC
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Example of Computing Control Limits for X - R Chart using JMP
LCL (R) = 0
WARNINGS: Group / Summary will sort the new table in alphabetical order of the grouping variable. Control charts must always be plotted in time order. Therefore, if the summary table is not in time order, you will have to sort the table in correct time order before making the control chart.
X-S (Mean-Standard Deviation) Chart
When to Use (Guidelines only)? - when subgrouping of samples or
measurements is applicable - n < 10
- when subgrouping is not applicable due to single unit reading may take a long time, unit reading is extremely expensive, etc.
X -R (Mean-Range)
Chart
X (Individual
Chart)
X -S (Mean-Standard
Deviation) Chart
Symbol X R X
X S
Description Mean of Sample Range of Sample
Individual Measurement
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SPC TRAINING
Classifications of control charts
Classifications of control charts are depending on the type of data
Variables data A characteristic measured on a continuous scale resulting in a numerical value Examples: Wire Pull, Ball Shear Strength, Coplanarity, Ball Height, etc.
Attributes data A characteristic measured by # of conforming & nonconforming to a specification. Output is classified as pass/fail or accept/reject. E.g. Broken Wire, Lifted Bond, FM, Chipping, Bent Lead, etc. Can be expressed in terms of fraction, percentage, count or DPM
p Chart
p
% Defective
np chart
np
# defective
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When to use different control chart(Guidelines only)
Control Chart X-R (Mean-Range) Chart
X (Individual) Chart
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有连续的7点位于中心线同侧
Upper Control Limit (UCL) Center Line (CL) Lower Control Limit (LCL)
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有明显的非随机图形的出现；
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发生OOห้องสมุดไป่ตู้时,如何处理
停止处于失控状态的机器的生产 按照OCAP的指示进行相应的处理 重新测数据，直到新的数据得到控制，才能继续生产
- when it's common to have single measurement spaced time apart
- when subgrouping of samples or measurements is applicable
- n > 10
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SPC TRAINING 何时/如何收集数据
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如何绘制在X BAR-R图表
按收集的X，R的数据，计算每组的Xi和Ri，根据控制线确定在X BARR CHART图上的位置，点上点，然后连线。
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4.SPC判断原则为哪些
Upper Control Limit (UCL) Center Line (CL) Lower Control Limit (LCL)
Mean of Sample Standard Deviation of Sample
Sample Size Must Be Equal Must Be Equal
One
Must Be Equal
Must Be Equal
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Control Charts For Attributes
Control Chart Symbol Description