DEK高级培训资料 - 第212页
Cp Cp = T OLERANC E RANGE P A TTERN WIDTH = T OLERANC E RANGE 6 x stdev Process Capability Formula Issue 2: July 2007 SIGMA SIGMA = SPECIFIED LIMIT ST ANDARD DEVIA TION SIGMA = 0.5 x T OLERANC E RANGE 1 x stdev
Cp = 1
TOLERANCE
Process Capability (Cp)
Issue 2: July 2007
Cp = 2
Cp = 1.33
Cp
Cp =
TOLERANCE RANGE
PATTERN WIDTH
=
TOLERANCE RANGE
6 x stdev
Process Capability Formula
Issue 2: July 2007
SIGMA
SIGMA =
SPECIFIED LIMIT
STANDARD DEVIATION
SIGMA =
0.5 x TOLERANCE RANGE
1 x stdev
Cp
Cp =
TOLERANCE RANGE
PATTERN WIDTH
=
TOLERANCE RANGE
6 x stdev
=
24
12
= 2Cp
= 0
-12
12
0
= 2
Process Capability example
Issue 2: July 2007
6 x stdev
12
SIGMA
SIGMA =
SPECIFIED LIMIT
STANDARD DEVIATION
=
12
2
= 6 SIGMA
6 SIGMA @ 12 = +/- 6 SIGMA @ +/- 12
-12
12
0