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在实践中,要测量某工序的工序能力指数C_P值,常常遇到零件尺寸分布中心与公差分布中心发生偏移的现象。因此,必须对假设零件尺寸分布中心与公差中心相重合时计算的C_P值加以修正,即C_(PK)。要计算C_(PK)值就必须计算修正系数k值,要计算k值又必须先求出零件尺寸公差分布中心对公差中心的偏移量ε。由于k值和ε值的代换计算较麻烦,尤其对刚学习质量管理和文化水平较低的同志更感到吃力。为此推荐以下简化的计算公式:式中,T──公差分布范围;
In practice, to measure the process capability index C_P value of a process, it is often encountered that the part size distribution center and the tolerance distribution center shift. Therefore, it is necessary to correct the C_P value calculated when the center of the size distribution of the part coincides with the tolerance center, that is, C_ (PK). In order to calculate the value of C_ (PK), the value of the correction factor k must be calculated. To calculate the value of k, you must first find the offset ε of the tolerance center of the part dimensional tolerance distribution. Since the calculation of substitution of k value and ε value is troublesome, it is especially troublesome to those who have just learned about quality management and lower education level. To this end recommend the following simplified formula: Where, T ─ ─ tolerance distribution;