In multiple operation stamping processes, a press tonnage signal measured by press tonnage sensors installed on press linkages/uprights, is the summation of die forces at all stations. Different from the current practice of using a whole cycle of press tonnage signals to monitor the compound condition of all stations, this paper proposes a new method to use the partitioned monitoring segments of press tonnage signals to monitor individual station conditions. For this purpose, a generic signal segmentation principle is proposed, and the Hotelling control charts are developed with consideration of the interactions among stations. A real case study of a doorknob stamping process is provided to demonstrate analysis procedures and effectiveness of the developed methodology.
Individual Station Monitoring Using Press Tonnage Sensors for Multiple Operation Stamping Processes
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received June 2003. Associate Editor: S. Jack Hu.
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Jin, J. (March 18, 2004). "Individual Station Monitoring Using Press Tonnage Sensors for Multiple Operation Stamping Processes ." ASME. J. Manuf. Sci. Eng. February 2004; 126(1): 83–90. doi: https://doi.org/10.1115/1.1643749
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