Statistical Process Control for SMT Electronic Manufacturing

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Statistical Process Control


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.


Statistical Process Control Chart


Is your process in control & capable?


Statistical Analysis of Manufacturing Process

X-Ray Images Statistical Data


Statistical Data from BGA Inspection

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Histogram



Void [%]Fr

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Statistical Data from other X-Ray Inspections

OPENS SHORTS VOIDS


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.


Parameters of Interest: Mean and VarianceFr

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µ

σ2

Mean (µ): Average of process performanceVariance (σ2): How consistent process performance is


How can we use statistical analysis to manage my manufacturing process?

Example 1: QFN Opens and Shorts

DAY 1 DAY 3 DAY 5


Another Example: LED voiding, day 1

8AM 1PM 8PM


Another Example: LED voiding, day 2

8AM 1PM 8PM


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


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


For more information

Contact us:www.creativeelectron.comChat with us live at our websiteEmail us at [email protected] us at 760.752.1192

Learn more at X-Ray University

http://creativeelectron.com/x-ray-university/


Thanks for your time!

Statistical Process Control for SMT Electronic Manufacturing

Technology

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