Process improvement for fused biconic taper coupler manufacturing by using six sigma

Abstract

This thesis studied the Fused Biconic Taper Coupler manufacture process. The objective of this studied was to improve process of Fused Biconic Taper Coupler with expected results, 1: Reduce scrap and scrap cost per unit 2. Reduce cycle time. The study used DMAIC which is one of the improvement models in the Six Sigma methodology to find out the root cause. From the study, Draw process is the root cause that makes scrap cost per unit increase. Following DMAIC model, many implement ways were applied to the current process but the result has still shown the high scrap cost and some implementation may cause the new problem. So, DMADV was chosen to be a model for new process design. To serve with the requirement of both manufacturing team and customer, the Kano model was used to reference for an exciting quality design. After feeding machine was designed, both technical criteria and the efficiency of the machine were verified by using statistical analysis before implement in the production line. Along this study, Brainstorm and meeting environment also are the other important factor that can make the clarify direction and good project management. In conclusion, result of this study achieves to reduce scrap of fiber in draw process reach to 94%, reduce average cycle time of draw process about 1-2 second, prevent 100% of scrap cost per unit which occur from the price of material changing, and improve inventory information management.