Abstract
The high customer requirements for appropriate product quality pose a challenge for manufacturers and suppliers and also cause them many problems related to ensuring a sufficiently high product quality throughout the entire production cycle. For the above reasons, it is so important to assess the capability of monitored processes, and shaping, analyzing and controlling the capability of processes is an important aspect of managing an organization that uses a process approach to management. The use of an appropriate method to analyze the course of production processes is a necessity imposed by quality standards, e.g., ISO 9001: 2015. That is why it is so important to propose a quick and low-cost method of assessing production processes. For this purpose, a method of assessing the capability of the manufacturing process using bootstrap analysis was used. The article presents the analysis of inherent properties of the production process based on the results of measurements of the characteristic features of the process or the characteristics of the manufactured products (process variables) for the shafts with grooves. The main goals of the work are to develop a procedure for determining process capability based on the bootstrap method, including criteria for the classification of production process capability; to develop the criterion values for confidence intervals of production process capability; as well as to demonstrate the practical application of bootstrap analysis in manufacturing. Moreover, comparative analyses of process capabilities using bootstrap and classic methods were carried out. They confirm both the narrowing of the confidence interval when using the bootstrap method and the possibility of determining a better estimator of the lower limit of this range compared to the results obtained using the classic method. The tests carried out for the unit production of shafts with grooves showed that the analysis of the process capability for measuring tests n = 10 is possible. Finally, new criterion values for the assessment of process capability for the bootstrap method were proposed. The model for assessing the capability of production processes presented in the paper was implemented in low-volume production in the defense industry.
Highlights
In the modern globalized market, and in connection with the growing requirements of customers, one of the key problems and at the same time challenges of suppliers is the quality assurance of manufactured products throughout the entire production cycle
One of the aspects of product quality assurance is the quality of production processes and in particular their capability
Process capability is an important factor in the cooperation between the supplier and the customer [1]
Summary
In the modern globalized market, and in connection with the growing requirements of customers, one of the key problems and at the same time challenges of suppliers is the quality assurance of manufactured products throughout the entire production cycle. Sci. 2019, 9, 5360 industry among others, in addition to product specifications and acceptable manufacturing defects, impose on their suppliers the required process capability, as the lack of process capability control can generate losses. To meet these requirements, the supplier should monitor and measure the course of manufacturing processes so as to be able to correct and improve the quality of the product based on reliable information. That is why the problem of assessing the capability of monitored processes becomes so important, and shaping, analyzing and controlling the capability of processes is an important aspect of organization management, especially when it uses a process approach to management
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