The investigation on the fracture of silicon steel in the reheating furnace

• Main Authors: Chia-hsuan Cheng, 程佳炫
• Other Authors: Yu-Hsi Huang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/39514656388757173607

碩士 === 國立臺灣科技大學 === 機械工程系 === 102 === Heating processes are commonly operated during manufacturing ultra-thin electromagnetic steel sheet. To increase the production of ultra-thin electromagnetic steel sheet, the heating rates need to increase. However, the improper increases in heating rates may induce fracture on ultra-thin electromagnetic steel sheet. Therefore, the proper heating rates are the important factors of manufacturing ultra-thin electromagnetic steel sheet. The effects of heating processes on the fracture mechanism of ultra-thin electromagnetic steel sheet will be numerically studied in this research. The strain energy density criterion will be used to predict the fracture mechanism in the study. To predict fracture of ultra-thin electromagnetic steel in heating , the critical strain energy density is applied to determine the optimal heating rates. According to the investigation of the optimal heating rates from numerical study, an experimental setup will be designed and developed by means of the similarity theory. Hence, a heating furnace system will be built to simulate the heat process of ultra-thin electromagnetic steel sheet. The effect of various heating rates on the fracture of ultra-thin electromagnetic steel sheet will be verified by experimental method. Through this research, in addition to be informed whether ultra-thin electromagnetic steel sheet by shortening the heating time to improve productivity, reduce energy costs, the theoretical model also applies to other kinds of steel for manufacturing various types of steel available and effective information. However, this study forecasting model destruction mechanism but ideal for ultra-thin electromagnetic steel sheet surface temperature under the assumption that the establishment of optimum temperature control technology, but the furnace device which is reachable target temperature is subject to a number of heat transfer parameters impact. Therefore, the reliable heating processes of the heating furnaces will improve the production of electromagnetic steel sheet and achieve energy saving requirements.