Capability Evaluation for an Total Producing Process

Process capability indices (PCIs) are powerful means of studying the process ability for manufacturing a product that meets specifications. However, available methods of Process Capability index evaluation are only for machining process. There are no methods for comprehensive evaluation of total producing process capability. In this paper, a comprehensive evaluation model of entire producing process capability is proposed by extending classic process capability index to purchasing, assembling and delivery inspection processes. Evaluation for Capability of critical unit of each producing process is given firstly. The total producing process capability index is got by summing the capability index of each stage using analytic hierarchy process to determine the weight. Finally, an application example is analyzed to show that the entire producing capability can be evaluated objectively. The presented method evaluates the capabilities of total producing process and provides chances for continuous improvement on the total producing process.