31. 僅給出規格上限 Su
各種規格型態下的 Cpk
μ
f ( x
)
SL
σ
x
μ- SL
μ
f ( x
)
SU
σ
x
σ3
)( XUSL
CpuCPK
−
==
僅給出規格下限 SL
σ3
)( LSLX
CpLCpk
−
==
Su -μ
單邊公差時:由於沒有規格中心
值,故 Ca =N/A ,故定義
38. Statistical Process Control –Statistical Process Control –
Identify and Reduce Process VariabilityIdentify and Reduce Process Variability
統計製程管制統計製程管制 -- 確認並降低製程變異確認並降低製程變異
Lower
specification
limit
Upper
specification
limit
(a) Acceptance
sampling
(b) Statistical
process control
(c) cpk >1