The path to shipping - Greenslade and Company, Inc. · Shipping "ZERO DEFECT PARTS" by Joe...
Transcript of The path to shipping - Greenslade and Company, Inc. · Shipping "ZERO DEFECT PARTS" by Joe...
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Presented by
Joe GreensladeGreenslade & Company, Inc.
The path to shipping “ZERO DEFECT PARTS”
and The role of +/- 6 Sigma
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Fasteners are different. You know you cannot……
head parts at 500 parts per minute.
roll parts at 1000 parts per minute.
head slot parts burr-free.
coat parts to have 1000 hours of salt spray resistance.
make a complete header change-over in less than an hour.
make SPC work in fastener manufacturing.
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ship “ZERO DEFECT PARTS” in production quantities!
Fasteners are different. Everyone know you cannot……
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Problem is…..customers are demanding “ZERO DEFECT PARTS”.
The question is no longer,“Can you ship ZERO DEFECT
PARTS?”
Now the question is, “When are you going to start shipping ZERO DEFECT PARTS?”
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The only path to “ZERO DEFECT PARTS”
is based on the prevention, not the detection of defects.
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The use of statistics is a majorfactor in achieving
“ZERO DEFECT PARTS”.
Average or MeanRangeStandard deviationor Sigma
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Sigma = Standard Deviation-a measurement of variation-
Sigma (std. dev.) equalsThe square root ofThe sum of the differences of the sample values minus the average of all of the samples, divided by the total number of samples minus one.
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.004.006.018Range
.248.247.259Low
.252.253.241High
.250.250.252Average
.252.253.25910
.248.247.2489
.251.251.2528
.250.250.2577
.252.253.2456
.248.249.2485
.252.252.2524
.249.248.2563
.250.250.2592
.251.251.2411
Tight Variation
Medium Variation
Wide Variation
Samples
Three samplelots measuring the same feature.
Specification:.240 - .260
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Wide variation in sample -All within specification
Spec: .240 - .26010 samplesHigh .259Low .241Range .018Average .250Sigma .006+/- 6 sigma.216 - .288
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Medium variation in sample -All within specification
Spec: .240 - .26010 samplesHigh .253Low .247Range .006Average .250Sigma .002+/- 6 sigma.238 - .262
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Small variation in sample -All within specification
Spec: .240 - .26010 samplesHigh .252Low .248Range .004Average .250Sigma .0016+/- 6 sigma.241 - .259
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Sigma predicts outcomesbased on the values of samples
If the average value of the sample lot +/- 6 sigma (std. dev.) falls within the tolerance limits……………………………the defective parts per million within the entire manufacturing lot will be 3.4 or less!
If +/- 6 sigma cannot be achieved, the closer you get the fewer defects you will produce.
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Incomplete understanding -poor chance for success!
What are the “mission critical” product characteristics for the customer?
Recess quality?Thread fit?
Straightness???????????
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Incomplete understanding -poor chance for success!
Drawings and specifications:
Dimensions & geometric tolerances?Physical requirements?Performance requirements?
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Incomplete understanding -poor chance for success!
Correlation of testing methods and acceptance criteria?
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Machine Capability
The Cp target should be 2.00.
This will yield not more than 3.4 discrepant parts per million.
This is +/- 6 Sigma.
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Feature tolerance
+/- 6 sigmaCp=2.003.4 defects/million
+/- 3 sigmaCp=1.003000 defects/million
Average
Higher Cp (process capability)
is likely to produce fewer defective parts.
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WARNING!
Old, cheap gaging technology will NOT get you to ZERO DEFECT PARTS!
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Gages must have low GR&R!
Where possible,gages should be variable, instead of fixed limit.
The target Gage Repeatability and Reproducibility (GR&R) should be 10%.
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Gage calibration is critical!
Strict adherence is critical:
TraceabilityRecognized calibration practicesCalibration frequency
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Gage calibration is critical!
Use outside calibration laboratories that are accredited to ISO 17025 by internationally recognized bodies. American Association of Laboratory Accreditation
Registration Number 1032.01
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Gage calibration is critical!
You can make all of the measurements you are supposed to, when you are supposed to, and every measurement can appear compliant, but ……………….
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Gage calibration is critical!
……if the gage is not properly calibrated, every single part might actually be NON-COMPLIANT!
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Consistent material-consistent parts!
Thoroughly defined requirements
ChemistryDimensionsCoating
Single vendor with registered ISO 9000 quality system.
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Consistent tooling-consistent parts!
Computer modeling of tooling designcan increase tool life.Scientific Forming Technologies Corp.John Walters614-451-8323
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Consistent tooling-consistent parts!
Tooling material selection
Carbide where possible (grade?)Titanium nitride coated tool steels
Single vendor with ISO 9000 registered quality system
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Start with conforming parts to yield conforming parts!
Two sets of eyes are safer than one!
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Process Capability
The Cpk target should be 2.00.
This will yield not more than 3.4 discrepant parts per million.
This is +/- 6 Sigma.
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Lowerspecification
Upperspecification
+/- 6 sigma3 defects /million
+/- 3 sigma3000 defects / million
Average
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Process controls are essential for consistent production!
Use “process monitors” on all equipment.
What does the equipment indicate(not the part)?
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Process controls are essential for consistent production!
Statistical Process Control (SPC):
Monitor “mission critical” features.
Monitor “free flow” features.
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Process controls are essential for consistent production!
Statistical Process Control (SPC):
Use computerizedcollection system!
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Vendors are critical to shipping consistent parts!
Have thorough requirement agreements.
Logical SPCNO CONTAMINATION!How accomplished?Acceptance criteria
Single vendor with ISO 9000 registered quality system
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All performance criteria must be met to ship “ZERO DEFECT PARTS”!
Understand requirements & acceptance criteria
StrengthTorque-tensionDrive torqueCorrosion resistance
Perform 30 piece test and evaluate Cpk.
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Perform Cpk analysis of “mission critical” features to make logical sorting decisions.
Inspect 30 samples.Random samples!One continuously processed lot!
Calculate Cpk on every selected feature.Cpk = 1.00 (3 sigma) will yield 3000 defects/million.Cpk = 2.00 (6 sigma) will yield 3.4 defects/million.
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“ZERO DEFECT PARTS” require sorting!
Roller sort ALL parts prior to shipping.
80% of sorting is to remove foreign material.Rollers remove most types foreign material.
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“ZERO DEFECT PARTS” require sorting!
Sort “mission critical” features with aCpk greater than 6 sigma.
Use laser, vision, sonic or other technology as appropriate.
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Shipping “ZERO DEFECT PARTS”
Requires:A thorough planAn approach based on logicAn extensive use of statisticsFlawless execution of the plan
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Every supplier wanting to ship “ZERO DEFECT PARTS” needs a
6 Sigma Black Belt on staff!
Six Sigma AcademyScottsdale, AZ480.515.9501 Cleveland State UniversityScott Darpel216-233-3271Uniworld ConsultingSan Antonio, TX 210 798 8888
Four weeks of training
Major project relevant to employer
Cost range: $12,000 to $42,000
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Contact Information
Joe GreensladeGreenslade & Company, Inc.2234 Wenneca AvenueFort Worth, Texas 76102817-870-8888817-870-9199 FaxE-mail: [email protected] site: www.greensladeandcopany.com