Post on 07-Jan-2017
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Statistical Process Control
Manufacturing process quality assurance.Solder joint measurement data, collected during x-ray test, can be statistically analyzed to identify manufacturing drifts, trends and other relevant process quality issues.
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Statistical Analysis of Manufacturing Process
X-Ray Images Statistical Data
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Statistical Data from BGA Inspection
Void [%]Fr
eque
ncy
of o
ccur
renc
e
20%
Histogram
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Statistical Data from BGA Inspection
Void [%]Fr
eque
ncy
of o
ccur
renc
e
10%
Histogram
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Statistical Data from BGA Inspection
Void [%]Fr
eque
ncy
of o
ccur
renc
e
20%
Histogram
www.creativeelectron.com
Statistical Data from BGA Inspection
Void [%]
Freq
uenc
y of
occ
urre
nce
Histogram
Void [%]
Freq
uenc
y of
occ
urre
nce
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Statistical Parameters of Interest
Mean, Average, Expected Value (µ):central value of a discrete set of numbers: specifically, the sum of the values divided by the number of values.
Variance (σ2):measures how far a set of numbers is spread out.
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Parameters of Interest: Mean and VarianceFr
eque
ncy
of o
ccur
renc
e
µ
σ2
Mean (µ): Average of process performanceVariance (σ2): How consistent process performance is
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How can we use statistical analysis to manage my manufacturing process?
Example 1: QFN Opens and Shorts
DAY 1 DAY 3 DAY 5
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You can’t manage what you don’t measure
Metrics are critical to manage a manufacturing processDepending on the process, metrics can be pad voiding, underfill voiding, shorts, opens, or all of these
Need to collect data and analyze it over time to properly manage process Spot checks are inadequate to verify longer term deviationsMean and variance of key statistical parameters can tell you a lot about the performance of your business
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Key takeaways
X-ray inspection systems are safe and easy instruments to use everydayMust be closely integrated to all aspects of manufacturing
Process designProcess validationProcess quality control
X-ray in the loop assures superior quality design and control
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For more information
Contact us:www.creativeelectron.comChat with us live at our websiteEmail us at info@creativeelectron.comCall us at 760.752.1192
Learn more at X-Ray University
http://creativeelectron.com/x-ray-university/