Capability of Measurement Processes - VDA...
Transcript of Capability of Measurement Processes - VDA...
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Quality Management in the Automotive Industry
Capability of Measurement Processes Capability of Measuring Systems Capability of Measurement Processes Expanded Measurement Uncertainty Conformity Assessment
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nd completely revised edition 2010, updated July 2011
Verband der AutomobilindustrieVerband der Automobilindustrie
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non-conformancezone
non-conformancezone
incre
asin
g
measure
ment uncert
ain
ty
UM
P
work piece tolerance
within the tolerance
L
outside the tolerance
outside the tolerance
specification phase (construction)
verification phase(production)
U
conformance zone
uncertainty uncertainty range range
Figure 1: Uncertainty ranges and conformance or non-conformance zones
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Measurement Result
EnvironmentEvaluation
MethodMan
GageMeasurement Procedure
Qualification
Accessibility
Sensibility
Measuring range
Time/cost
Stability
Resolution
Surface
Shape
Material
Physical const itution
Psychical constitution
Statisticalmethod
Computerapplicat ion
Measurementvalue composition
Mathemat.models
Pressure
Temperature
Humidity
Soiling
Care
Calibration/justification
random measurement deviat ions
not recorded bias
Sett ing uncertainty
Discipline
MotivationVoltageElectricity
Vibrations
Object
Measuringpoints total
Measuring points layout
tactile touch
contact-free
Master
Surfacetexture
Type of master
Shape/Position
Measurement stabilityCapacity
Mounting Fixture
Location
Stability
Position
Shape
Illuminat ion
Figure 5: Important influences on the uncertainty of measurement results
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Chapter 4.7 - Figure 7 - Page 41
Figure 7: Flow chart for assessing the capability of measurement processes
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Figure 9: Display of the real C-value as a function of the observed C-value subject to QMP
0,00
0,20
0,40
0,60
0,80
1,00
1,20
1,40
1,60
1,80
2,00
2,20
1,72
2,40
2,60
2,80
3,00
3,20
3,40
3,60
3,80
4,00
real C
valu
e
1,33
0,50 0,60 0,70 0,80 0,90 1,00 1,10 1,20 1,30 1,40 1,50 1,60 1,70 1,80 1,90 2,00
observed C value
QMP 50% 40% 30%
20%
10%
1,67
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Chapter 5.2 - Figure 10 - Page 51
1, 2, or 3 reference standards,
repeat measurements
%RE 5%TOL
Measurement System Capability
yes
minimum 3 reference standards,
repeat measurements
Use measurement system with a
sufficiently high resolution
yes
{ }maxEVR giu s=from ANOVA:
uEVR (pure error deviation)
max3
iBi
Biu
=
MS MSU k u= ⋅2
100%MSMS
UQ
TOL
⋅
= ⋅
QMS QMS_maxMeasurement system
capable
Measurement system
not capable
noyes
from ANOVA:
uLin (lack-of-fit deviation)
MPE known
and accepted?
Prepare trial
Linearity uLINknown?
no
no
yes
no
max2
CAL
CALi
Uu
=
max
2
CAL
CALi
Uu
=
Prepare trial document MPE
-
_ max
2100%MS
MIN UMS
MS
UTOL
Q
⋅
= ⋅
uMS see table 12
Figure 10: Measuring system capability analysis
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Chapter 5.2.2.2 - Figure 15 - Page 62
Figure 15: Diagram of an analysis of variance
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Chapter 5.2.2.2 - Figure 16 - Page 63
Figure 16: a.) Value chart of the residuals b.) Residuals plotted on a probability plot c.) Residuals plotted on fitted values
a.)
b.) c.)
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Chapter 5.3 - Figure 19 - Page 66
Measurement Process Capability
Measurement
system capable?
Determination of uncertainty components
not considered in the experiment
Method B: i.e. uOBJ, uT
no
yes
QMP QMP_max
Determination of uncertainty components
considered in the experiment
Method A: uEVO, uAV, uGV, uIAi from ANOVA
uSTAB (possibly uOBJ)
{ }2 2
2 2 2 2 2 2
2 2
2
2 2 2,max ,MP EVO
AV GV STAB T OBJ IAi RES
CAL EVR RE BI N
T
LIu u u uu u
u u u u
u
u u u
=
+ + + + + + +
+ + +
∑
MP MPU k u= ⋅ MPMP
UQ
TOL
2100%
⋅= ⋅
Measurement process not
capable
no
Measurement process capable
yes
Measurement system not
capable
-
_ max
2100%MP
MIN UMP
MP
UTOL
Q
⋅
= ⋅
Figure 19: Measurement process capability analysis
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Figure 23: Value chart plotting all reference values and the calculated uncertainty range
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Annex B - Figure 24 - Page 98
Figure 24: Determining the standard uncertainty from temperature uT
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Annex E - Figure - Page 108
ideal y = x
real
measured value0
b
display
0
b
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Annex E - Figure - Page 109
ideal y = x
real
measured value
display
2. reinforcement
0
1. set zero point
set gradient
0
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Annex E - Figure - Page 109
measured value0 L U
ideal y = x
real
display
0
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Annex F.1 - Figure - Page 111
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Annex F.1 - Figure - Page 112
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Annex F.1 - Figure - Page 113
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Annex F.2 - Figure - Page 116
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Annex F.4 - Figure - Page 125
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Annex F.5 - Figure - Page 129
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Annex F.5 - Figure - Page 130
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Annex F.6 - Figure - Page 134
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Annex F.6 - Figure - Page 136
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Annex F.6 - Figure - Page 138
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Annex F.6 - Figure - Page 141
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No. ofrepetitions
Operator A
Operator B
Result
Result
Result
Result
mixed
Result Result
mixed
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No. ofrepetitions
Operator A
Operator B
Result
Result
Result
Result
mixed
Result Result
mixed
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Annex F.9 - Figure - Page 151
Unsorted test results
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Annex F.9 - Figure - Page 152
Sorted test results
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