Six Sigma for improving aesthetic defects in aluminum profiles facility

Abstract

PurposeThis paper aims to develop a quality plan to detect aesthetic defects in extruded aluminum profiles before the fabrication stage based on the Six Sigma improvement methodology in an aluminum facility. These defects are hard to be detected at the fabrication stage. It is also hard to be fixed in the site.Design/methodology/approachThe research methodology utilized the DMAIC framework (define, measure, analyze, improve and control). The methodology relies on statistical analysis (histogram, control charts and Pareto) and field work (observations, focus groups and interviews).FindingsThe process shows significant improvement in aesthetic defect reduction that aids in reaching a Four Sigma quality level.Practical implicationsAluminum fabrication is known to be vulnerable for many types of defects such as scratches and debris on work surface. In addition, post-fabrication defects may also occur due to improper coating caused by chemical imbalance, blocked filters or blocked sprays.Originality/valueThe main contribution of this research is to demonstrate the use of DMAIC framework to reduce the aluminum aesthetic defects that reach the end customer. The Six Sigma methodology is a well-known quality improvement framework that relies heavily on quantitative data. More precisely, it is widely used to control defects in quantities such as weights, heights, etc. In this research, it has been used to control qualitative data (aesthetic). This will enable objective decisions for facility management rather than subjective.