Track: Quality Control and Management

Abstract

Quality becomes one of the most important factors for sustaining company competitiveness in this intense industry competition. To control the quality of the ongoing production process, the common method used is Statistical Process Control (SPC), which is basically part of Statistical Quality Control (SQC). The primary tool used in SPC is control chart. Many companies conduct quality control by performing inspections of product defect with more than one defect attributes, or multi-attribute. Such conditions require the use of multi-attribute control chart. However, unlike the research developments in the field of multivariate control charts, little research has been done in the field of multi-attribute control charts. This research proposed a framework of statistical process control for some simultaneously correlated defect characteristics on bronze pipe fittings production process using multivariate np chart (MNP chart). The MNP chart consists of Phase I as the formulation of the initial control limits using the preliminary sample and Phase II as a reference for future statistical process control. The result of Phase I and II of the multi-attribute control chart application indicates that there were out-of-control processes, to then be identified and analyzed the main contributor of the cause.