Análise de peças refugadas por não conformidades no processo de injeção sob pressão

Abstract

This work was carried out with the objective of reducing the number of wasted pieces due to nonconformities in the process of aluminum injection under pressure, in a foundry industry in the interior of Paraná. The process of aluminum diecasting under pressure allows the creation of parts with different geometries and high production capacity, however, this high productivity can be practically be completely lost if some defects appear in the parts. These defects occur due to several factors, and to determine their cause, it is necessary to investigate the injection process first and only then determine its cause. To fulfill this objective, it was necessary to understand the entire injection process and to know the kind of defects appear in this type of foundry. To assist in the analysis of the wasted parts, some quality tools such as the Pareto Diagram were used to determine which parts should be investigated, and the 5 Whys method helped to discover the root cause of the problem. As a result, there was a significant drop in the number of wasted pieces and greater detailing of the process.