Study on the Oxide Scale Composition of Hot-rolled Coils by using Taguchi Method

• Main Authors: Chen-Tsung Hung, 洪成宗
• Other Authors: Ying-Fang Huang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/rd37ua

碩士 === 國立高雄應用科技大學 === 工業工程與管理系碩士在職專班 === 102 === Hot-rolled coils have enough strength, good thoughness, easy processing and nice welding performace, which can easily to connect with other frame of metal. Therefore they are widely used in cars and constructions. But the hot-rolled coils without package normally so they are easily rusted in the transportation and storage. The rust will erode base material of coils and influences the application and let the customers’ cost get higer for removing it. In the different equipment, environmental and operation conditions that the oxide scale composition is different, too. The oxide scale composition could cause the different application of products in after process. Therefore, how to make a control model about the oxide scale composition to improve the surface and corrosion resistance of hot-rolled coils is very important. Taguchi method has many advantages including: high repeatability, large flexibility, fewer experiments, parameter design easy and analysis simply, which is largely applied in manufacturing industry. In this case, we used Taguchi method according on references and dicussed with engineers to found 5 control factors which one with 2 levels, L8(27) orthogonal arrays. Finally we found 2 control factors cound effect the oxide scale composition of hot-rolled coils. The S/N ratio of Fe3O4 raised 2.12 dB and quality characteristics raised 14.82%. In this research by the Taguchi method we found the control factors of oxide scale composition. We can use the different process conditions to get the composition what we need and improve the subitable of products. Following the application of products tunes the process conditions. In the future, we can develop pickle-free steel and pickle-less steel.