Process capability indices (PCIs) are powerful means of studying the process
ability for manufacturing a product that meets speci®cations. Several capability
indices including Cp, Cpu, Cpl and Cpk have been widely used in manufacturing
industry to provide common quantitative measures on process potential and
performance. The formulas for these indices are easily understood and can be
straightforwardly applied. However, those process capability indices are inappropriate
for asymmetric tolerances and could not be applied to evaluate multiprocess
products. Based on Cp, Cpu, Cpl and Cpk, this research aims to develop
one process capability analysis chart (PCAC) for precisely measuring an entire
product composed of symmetric tolerances, asymmetric tolerances, larger-thebetter
and smaller-the-better characteristics. The process capability analysis
chart evaluates the capabilities of multi-process products and provides chances
for continuous improvement on the manufacturing process.
關聯:
International Journal of Production Research, 39(17), 4077-4087
