Abstract
One of the first metrics of production quality is the FTQ (First Time Quality) index, which has gained new attention with process control methods driven by Industry 4.0. A manufacturing line with an FTQ below 100% causes the discarding of produced units or rework time, implying higher production costs and negative impacts on quality goals. To guide quality actions, mainly in processes with several incident factors, there is a need for a lower granularity target that allows the definition of correction actions still during production. This paper presents a study on quality indicators that can better represent the performance regarding the occurrence of defective units in the final test process of the equipment assembled by Ingeteam Brasil. The methodological guideline is to assess the effectiveness of using some quality indicators for short- (weekly) and medium-term (monthly) monitoring of the performance of the mentioned process, aiming to identify correlations between them and support faster decisions to reach the desired quality targets. In this sense, a short-term upper control limit is derived for each product based on its behavior during the test process to identify units and failure causes that may compromise the FTQ goal and should be analyzed. To this end a software quality test tool was developed, the Quality Test System (QTS), which records important information about the test process such as required test stations, operators, product serial number, test steps, detected failures, etc. QTS is integrated with the shop floor system integrating production and testing.
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The authors thank the Ministry of Science, Technology, and Innovation for the financial support to this R&D project through the PPB (Basic Productive Process).
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Homem, M.O., Bettanin, F.R., de Souza, J.M., de Holanda, G.M., Cristófani, F. (2023). Fault Management in Manufacturing Process: Quality Indicators for Short- and Medium-Term Monitoring and Their Interrelationship. In: Iano, Y., Saotome, O., Kemper Vásquez, G.L., de Moraes Gomes Rosa, M.T., Arthur, R., Gomes de Oliveira, G. (eds) Proceedings of the 8th Brazilian Technology Symposium (BTSym’22). BTSym 2022. Smart Innovation, Systems and Technologies, vol 353. Springer, Cham. https://doi.org/10.1007/978-3-031-31007-2_9
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