Improving the Process Quality of Investment Casting Industry via Six Sigma－A Case Study of B Company

• Main Authors: Wang-tzu Cho, 卓琬姿
• Other Authors: Chau- Chen Torng
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/666m6z

碩士 === 國立雲林科技大學 === 工業工程與管理系 === 103 === Chinese's manufacturing sector, the most important competition in the market, subject to the same competition, in order to break through price competition, improve product quality and highest priority, therefore, the importance of the quality of attention. Business managers can no longer be past the old norms to judge the quality problem, you should have to face up to the current quality problems, introducing appropriate improvement methods. With the advancement of technology faces major companies, the relative quality of the process followed to enhance, reduce product defect rate has become valued by many businesses. There are good and stable quality control process, product defect rate will therefore reduce, you can really meet customer demand and reduce the company's production costs. In order to get the best quality, enterprises should select the most appropriate quality management system tools to assist businesses stable quality, streamline processes, improve efficiency and reduce the cost of the optimal strategy. And promote Six Sigma, it is to obtain one of the best quality management system tools. By pushing Six Sigma, to achieve enterprise restructuring physique, improve profitability, enhance the quality of the best state. In this study, the case of traditional lost-wax casting industry company B as the main object of study, and to collect the relevant literature, the application of Six Sigma improvement techniques to improve the quality of our products problem cases of sand hole defect rate, in order to improve customer satisfaction, reduce product defect rate and save production costs. The results showed that the use of Six Sigma quality improvement techniques and with the SOP and experimental design, which can effectively reduce product defect rate, 21.38% rate of improvement before adverse reduced to 5.4%, reduced scrap and rework costs by the monthly average of 1.07 million to 430 000, Sigma index increased from 2.3 to 3.1; case if the company continued to apply six Sigma DMAIC approach to improve the overall quality of the process, will enhance the company's competitiveness and cost savings. Keywords: Six Sigma, Investment Casting, defection rate, DOE