Defect Reduction by DMAIC Method: A Case Study of a Jewelry Manufacturer

  • Luederat Chartmongkoljaroen
  • Radha Sirianukul
  • Piyawan Puttibarncharoensri
  • Wasana Marksin
Keywords: Lean Six Sigma, DMAIC Methodology, Defect rate, Cause and Effect Diagram, ลีนซิกส์ซิกมา, ระเบียบวิธี DMAIC, อัตราของเสีย, แผนผังก้างปลา

Abstract

This research is a case study of a jewelry manufacturer with the purposes to solve a problem of the defect rate of resins in the modeling department. DMAIC methodology (Define, Measure, Analyze, Improve, and Control) was applied in the research to analyze and identify root causes of the defective resins, improve modeling processes, and reduce a defect rate of resins. Data were collected by using the data collection forms, observations, interviews, and historical data. As a result, there are eight root causes of the defects divided into four categories of the causes and effects diagram. The research was scoped down to focus on only two categories, which are methods and manpower. Researcher proposed five solutions to solve the problem of defects as well as few control strategies to measure and maintain the improvements. Company has gained many benefits from this research. The results clearly indicate that the defect rate of resins decreased significantly.

Author Biographies

Luederat Chartmongkoljaroen

Ms. Luederat Chartmongkoljaroen is a MSc. Supply Chain Management student, Martin de Tours School of Management and Economics, Assumption University.

Radha Sirianukul

Dr. Radha Sirianukul is a chairperson of International Business Management Department, Martin de Tours School of Management and Economics, Assumption University.

Wasana Marksin

Ms. Wasana Marksin is a lecturer in Industrial Management and Logistics, Martin de Tours School of Management and Economics, Assumption University.

Published
2020-06-01