TA的首页cpk explaination
CPK
流程能力指标(等式)是用来测量离心状态,有效率的流程CP表现为更向中线靠拢,产生更少的差错,他们是根据均值和可以接受的上下限和理论数值的最短距离的差值,与实际测量到的单侧到3西格玛值分布之间的比率.Cpk = (上限值-均值)/(3 x sigma) 或者 (均值-下限值)/(3 x sigma).
通过调整数据漂移的上下浮动状态,CPK可以变小,但是不包括另一侧的数据差错.
1.33是CPK的理想值.
Process Capability index ('equivalent') taking account of off-centredness: effectively the Cp for a centered process producing a similar level of defects - the ratio between permissible deviation, measured from the mean value to the nearest specific limit of acceptability, and the actual one-sided 3 x sigma spread of the process. As a formula, Cpk = either (USL-Mean)/(3 x sigma) or (Mean-LSL)/(3 x sigma) whichever is the smaller (i.e. depending on whether the shift is up or down). Note this ignores the vanishingly small probability of defects at the opposite end of the tolerance range. Cpk of at least 1.33 is desired.
流程能力指标(等式)是用来测量离心状态,有效率的流程CP表现为更向中线靠拢,产生更少的差错,他们是根据均值和可以接受的上下限和理论数值的最短距离的差值,与实际测量到的单侧到3西格玛值分布之间的比率.Cpk = (上限值-均值)/(3 x sigma) 或者 (均值-下限值)/(3 x sigma).
通过调整数据漂移的上下浮动状态,CPK可以变小,但是不包括另一侧的数据差错.
1.33是CPK的理想值.
Process Capability index ('equivalent') taking account of off-centredness: effectively the Cp for a centered process producing a similar level of defects - the ratio between permissible deviation, measured from the mean value to the nearest specific limit of acceptability, and the actual one-sided 3 x sigma spread of the process. As a formula, Cpk = either (USL-Mean)/(3 x sigma) or (Mean-LSL)/(3 x sigma) whichever is the smaller (i.e. depending on whether the shift is up or down). Note this ignores the vanishingly small probability of defects at the opposite end of the tolerance range. Cpk of at least 1.33 is desired.
RSS Feed