The evaluation of process capability for a machining center |
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Authors: | K T Yu S H Sheu K S Chen |
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Affiliation: | (1) Tzuchi College of Technology, 880, Sec. 2, Chen-Kuo Rd., Hualien, 970, Taiwan;(2) Department of Industrial Management, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei, Taiwan, 106, People’s Republic of China;(3) Department of Industrial Engineering and Management, National Chin-Yi Institute of Technology, 35, Lane 215, Sec. 1, Chung San Rd., Taiping, Taichung, Taiwan, 411, People’s Republic of China |
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Abstract: | The machining center methodology is widely applied to production systems within the fast-developing processing industry. The
automated machining center can simultaneously perform certain processes, such as milling, drilling, boring, and reaming, on
the same machine at the same time, and manufactures limited quantities of multiple-type products. These products usually have
numerically important quality characteristics with high accuracy. However, a machining center is unable to measure process
capability on its own. Thus, we reflect the process capability of a machining center by measuring the quality characteristics
of its processing products. In this paper, we propose the three integrated process capability indices (PCIs) C
pmc, C
amc, and C
pmmc to evaluate the integrated process precision, accuracy, and actual capability respectively. Furthermore, we develop a process
capability monitoring figure (PCMF), which not only displays the status of the process precision and accuracy by the color
management method 1], but it also forecasts the integrated process capability of the next productive time (batch) through the analysis of time
series. Using the PCMF, engineers will be assisted with tasks such as monitoring the process quality, deciding the period
of the borer’s replacement, and designing the process parameters. |
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Keywords: | Process capability indices Multi-characteristics Machining center |
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