Abstract :

During manufacturing, quality must be maintained, it has always been considered a very important success factor for companies. Producing high quality products while maintaining minimal costs is the mandate of all manufacturing companies. Therefore our study is based on the study of quality defects of Half Shaft part. A Moroccan automobile manufacturer of mechanical transmission parts is considered as a testing ground, the case study is oriented towards the study of induction hardening process of the Half Shaft part. In order to meet customer requirements in terms of part hardness specifications, a heat treatment is applied which subsequently generates depth hardness defects. A classification method based on the Analytical Hierarchy Process (AHP) is applied in order to classify these defects according to specified criteria chosen by experts. It is a decision-making method in the case where there are several criteria. The defects generated in the induction haredening process are depth hardness defects which differ according to the section of the part. In this context, four depth hardness defects will be considered, and three criteria will be chosen in order to applicate the AHP method. The classification of these defects helps to select the crucial defect to eradicate it and subsequently obtain better quality parts.

Key words :

Quality, Analytical Hierarchy Process (AHP), Hardness defects, Induction Hardening, heat treatment.