Date of Publication :24th March 2023

Abstract: Since good quality is a sign that shows the low amount of waste, the term "quality" has become significantly important in manufacturing field. However, it will be difficult to maintain high quality production due to the complexity of machining processes nowadays. Injection molding is one of the processes that is known for multiple control factors, by using traditional method to conduct an experiment is costly and time-consuming. The application of the Taguchi method can reduce the number of trials while considering multiple factors at once. In this research, a framework of quality development was proposed for improving the injection molding process. By going over the framework, four main control factors were identified, which are melt temperature, cooling time, holding pressure and injection speed. The optimal parameter setting has been found at 435 °F, 8 seconds, 1800 psi and 1.2 inch squared per second respectively. On top of that, when comparing the settings of baseline and optimal, it can be concluded that the Cp stay at the same level, but the Cpk of optimal setting is increased from 0.279 to 1.209, which successfully makes defect rate dropped nearly 80% compared to the baseline setting.

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