Applying Six Sigma Technique to Improve the Capability of Valve Spring Process

• Main Authors: Tong-Long Tsai, 蔡東榮
• Other Authors: Gu-Hong Lin
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/70150605540792185673

碩士 === 國立高雄應用科技大學 === 工業工程與管理系 === 98 === Six sigma, following Total Quality Management, is a brand new management for pursuing excellent quality. It uses strategy, culture change and a wide variety of management and statistical tools, integraed together as a way of implementing project programs as well as objectives. By using this method, the errors can be to the most extent excluded from the work process and the least variations can be reached. As such, both cost and time can be saved which can be perceived as a philosophy. Valve spring is applied to the key componetns of motorcycle clutch, the quality of which, whether good or bad, will influence the safety of driving. This study is to explore the effectiveness of valve spring used in motorcycle clutch, in which DMAIC’s six sigma is introduced in the manufacturing process. Coupled with experimental design, it is expected to gain the key factors influencing manufacturing process capability and reach its optimal combination level. By using the method of statistical test with the significance of 95% confidence, the mean of quality characteristics falling from original 20.6 to 2.43 can be assured. This successfully verifies the process improvement may enhance manufacturing process level, which may save 530 thousand internal cost as well as the reduction of previous operation time of manufacturing process into half. This will effectively increase company’s competitive power.