Use six sigma to find and optimize the production parameters for needle positions transition of an embroidery machine.
| Autor: | Ming-Ta Lee, 李明達 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In domestic sewing machine industry, general mechanical models are facing severe price war due to their similar specifications and lower production technology to make. As a result, it's critical for domestic sewing industry manufacturers to develop a series of further value-added commercial embroidery machines to the market. However, this high end model will require a more precise machining techniques to reach a stablized product quality and earn the trust from the consumers. This study is providing a method of analyzing the production processes of the needle position change unit, which is a key quality factor of a single-head with multi-needles embroidery machine, and giving a solution of how to improve the production quality. This study is taking DMAIC approach of Six Sigma analyze key factors and levels and is combined with Taguchi methods of 3 levels, 4 factors to find best prouction ability and compare it with Response surface methodology result. The empirical research data is based upon a domestic sewing machine manufacturer's CNC machining processes on the needle position change unit to find an optimized model for an uniform machining results of the distance between holes on the plate. In the meanwhile, the study is interacting DMAIC approach with TRIZ 39 engineering parameters to find significant factors so as to conduct a further in-depth interviewing with professionals and assessment on key quality factors. After analyses, the Taguchi method will improve the production ability from Cpk 0.61 to 1.38 but the Response surface method will increase the production abiltiy from 0.61 to 1.43. As a result,Response surface method will be superior to the Taguchi method in improving the machining quality of the needle position change unit. For the feed rate of the cutting tool, both methods can increase the speed from 100mm/min to 300mm/min and enhance the machining stablity on the cold rolling iron bar and increase the quality. This study findings can contribute to other similar industries to improve their machining qualities. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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