Measurement Process Capability – Trends and （测量过程能力u2014u2014趋势和）.pdfVIP

MEASUREMENT SCIENCE REVIEW, Volume 1, Number 1, 2001 Measurement Process Capability – Trends and Approaches Eva Kureková Abstract A measurement control system ensures that measuring equipment and measurement pro- cesses are fit for their intended use and its important in achieving product quality objec- tives. The following paper introduces theoretical foundations for determination of the mea- suring process capability. Defines three capability indexes in short and recommended use of the Cpm index. Keywords statistical process control, measurement process control, capability index, Taguchi function 1 Introduction Several years can be observed attempts to stan- bility. Both such efforts are determined by the tech- dardise evaluation of the processes (whether pro- nological development of the measuring instru- duction or measurement) capability. Such attempts ments. Due to the technical innovations (incorpo- have not been successful yet. Many factors must rating electronics enabling predictive diagnostics, be taken into account – processes heterogeneous- autocalibration, automatic correction of the out- ness, changing requirements, wide variety of used put signal according to the status of the measuring technological means. Therefore big production en- instrument) variability of the measurement process terprises (General Motors, Volkswagen, Siemens, is decreasing and the effort for its centering impro- Bosch, etc.) have established their shop methodol- ve capability of the measuring instruments (see Fig. ogies for the evaluation of the processes capabili- 1). Economical savings represent the direct impact ty. Capability of measurement processes is searched – po