Abstract
In this thesis, a workflow to improve the polishing process of hard disks with the Taguchi methods is proposed. First, the essential test factors that specifically influence the polishing process are selected by the engineers’ discretion. Next, the effects of the control factors and the noise factors of the process on the product’s quality are analyzed. Finally, after implementing the Taguchi methods to improve polishing process, we assume to reduce defective products and increase product yields. According to the orthogonal array, all the control factors are placed in the array representing an experiment that is suitable. The factors that significantly affect the product quality are distinguished and the optimal polishing parameter is composed via measuring and analyzing the results of the experiments of real operation. This research demonstrates that by choosing the proper levels of optimal parameter of polishing, the yields of hard disks can be raised. The results of this research show that applying the Taguchi methods in real factory processes reduces costs effectively.