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International Journal of Industrial Engineering, 16(3), 171-181, 2009.

Implementation of Six Sigma in a Manufacturing Process: A Case Study
Adan Valles1, Jaime Sanchez1, Salvador Noriega2, and Berenice Gómez Nuñez1
1

2

Research and Graduate Studies Division
Cd. Juarez Institute of Technology
Cd. Juarez, Chih. México

Department of Industrial and Manufacturing Engineering
Institute of Engineering and Technology
Autonomous University of Cd. Juárez
Cd. Juarez, Chih. México

Corresponding author’s e-mail: {Adan Valles, [e-mail]; Salvador Noriega, [e-mail]}

This paper presents a Six Sigma project conducted at a semiconductor company dedicated to the manufacture of circuit cartridges for inkjet printers. They are tested electrically in the final stage of the process measuring electrical characteristics to accept or reject them. Electrical failures accounted for about 50% of all defects. Therefore, it is crucial to establish the main problems, causes and actions to reduce the level of defects. With the implementation of Six Sigma, it was possible to determine the key factors, identify the optimum levels or tolerances and improvement opportunities. The major factors that were found through a design of experiments 3 factors and 2 levels were: abrasive pressure (90-95 psi), height of the tool
(0.06-0.05) and cycle time (7000-8000 msec.). The improvement was a reduction in the electrical failures of around 50%.
The results showed that with proper application of this methodology, and support for the team and staff of the organization, a positive impact on the quality and other features critical to customer satisfaction can be achieved
Significance:

Six Sigma literature is extensive, although there are many reports on its application, it is extremely important the gathering empirical evidence to build a body of Six Sigma with better explanatory capability. Keywords:

Six Sigma, Repeatability and Reproducibility Gauge

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