CAPABILITY PROCESS ASSESSMENT IN SIX SIGMA APPROACH

Authors

  • Andrzej Czarski Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Cracow, Poland

DOI:

https://doi.org/10.7494/mafe.2007.33.2.105

Keywords:

quality management, statistical methods, Six Sigma, heat treatment

Abstract

Statistical techniques occupy a particular place in the organizational culture Six Sigma that is used in many renowned organizations (Motorola, General Electric, Bombardier, Nokia, Sony, BMW, Philips etc.) in order to achieve in the shortest possible time the highest quality level. In the Six Sigma approach the assessment of a process potential is made relating to client's expectations using long-term and short-term process capability - correspondingly Cp, Cpk and Pp, Ppk. The basis of such an assessment of process capability is partition of the total process variability into two components: the component independent on time (the same material, operator, tools and process setting) and the component dependent on time (caused by e.g. changes of raw material, process setting etc.). Such a partition of the variability is necessary, it enables the better understanding of the process and in consequence - its improvement. The aim of research has been the assessment of short-term and long-term capability of the process of drop forgings heat treatment regarding the hardness. The estimation of capability indices Cp, Cpk and Pp, Ppk as well as the detailed interpretation of the results have been carried out.

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References

Breyfogle F. W.: III, Implementing Six Sigma. Smarter Solutions Using Statistical Methods, Second Edition, John Wiley&Sons, Inc., 2003

Pandę P.S., Neuman R.P., Cavanagh R.R.: Six Sigma. How GE, Motorola and Other Top Companies are Honning Their Performance, KE Liber S.C., 2000 (in Polish)

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Rath&Strong's Six Sigma leadership handbook, Edited by Thomas Bertels, John Wiley&Sons, Inc., 2003

Six Sigma. International Conference, Wrocław Centre for Technology Transfer, Wrocław University of Technology, January 2004 (in Polish)

Montgomery D.C.: Introduction to Statistical Quality Control, Third Edition, John Wiley&Sons, Inc., 1997

Kotz S., Lovelace C.R.: Proces Capability Indices in Theory and Practice, Arnold, 1998

Joglekar AM.: Statistical Methods for Six Sigma. In R&D and Manufacturing, John Wiley&Sons, Inc., 2003

Glossary and Tables for Statistical Quality Control, Third Edition, ASQ Statistics Division, ASQ Quality Press, 1996

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Published

2007-12-31

How to Cite

Czarski, A. (2007). CAPABILITY PROCESS ASSESSMENT IN SIX SIGMA APPROACH. Metallurgy and Foundry Engineering, 33(2), 105. https://doi.org/10.7494/mafe.2007.33.2.105

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