多变量工序能力评价

首先指出采用多变量工序能力指数评价工艺生产水平的必要性,给出三种不同的多变量工序能力指数定义,分别为直接域比值定义、修改规范域定义和修改工艺域定义,并分析这些多变量工序能力指数.最后用一个实例说明采用多变量工序能力指数比采用单变量工序能力指数评价产品更为可取和全面.

The Evaluation of Process Capability with Multivariate

First,the paper discusses the necessity of using multivariate process capability indices to evaluate process level.Then three different definitions of multivariate process capability index are presented,such as based on direct zone,modified tolerance zone and modified process zone.At last,an application example is provided to indicate this point that multivariate process capability indices are more applicable and comprehensive than univariate process capability indices.