Application of Variable Sampling Intervals on the Process Capability Index Cpm

• Main Authors: Hsiang-Ta Chiang, 江享達
• Other Authors: Jing-Er Chiu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/23152182302120224567

碩士 === 國立雲林科技大學 === 工業工程與管理研究所碩士班 === 92 === ABSTRACT The control chart is to monitor the status of process and to ensure the quality of product. The process capability Cpm takes into account the target value and process variation as well considering Taguchi loss function. In this research, we study the variable sampling interval control chart and apply it to Cpm. We found out the appropriate sample sizes are five to seven for variable sampling intervals Cpm control chart and short and long sampling intervals would be suggested to be 0.1 and 1.9 respectively. We also found that the variable sampling interval on the Cpm is more efficiency to detect the small shift of process, and it can be applied the situation when we need to monitor the products purchased from other company and to ensure the quality of the products.