Software Design for Quality-oriented Statistical Tolerance and SPC

The software has been designed specially for concurrent application of the statistical tolerance (ST) and the statistical process control (SPC). The software system includes the two function modules for data, i.e. the data acquisition module with data collection and input, and data processing module with data storage and management, statistical analysis and control charts drawing. The system provides a set of functional modules for realizing three tasks: ST and SPC design, drawing control charts and verifying for assuring the designated process quality indices (PQIs) that representing required process quality. Some considerations for the software design are discussed and the mathematical modeling for ST and PQIs are given. The main steps for ST and PQI verification with the controlled process data are also introduced. The software of quality-oriented ST and SPC has been tested for its computing accuracy and precise. It provides an efficiency tool for ST and SPC parameter design and a convenient communication platform for product designers, manufacture engineers and quality engineers.