关于对过程能力指数计算公式改进的研究

Process capability index is a reflection of product quality assurance process as an important indicator of the degree. Application in practice there are some shortcomings. The reason is that normal distribution based on the assumption that under the conditions of process capability index formula for random variables with regard to average value of the discrete level for the variation indicators as the standard for the calculation of. Quality management in the core of an important indicator of value is the best level of standards known as the target-value, namely: the standard value. Product quality indicators and standard values of random variable degree of variation of discrete indicators are real sense of the standard deviation. They of introduction introduction into the process capability index formula for calculating the true measure of process capability can meet the technical requirements for the degree.