| Summary: | 碩士 === 國立高雄科技大學 === 模具工程系 === 107 === The study investigates the causes of the different casting and hot rolling conditions on different edge crack to slab casting of C2680 copper alloy. Different manufacturing process factors might cause C2680 copper alloy to have crack on the two sides of copper coil when it is calendaring. Therefore, the current study focuses on decreasing hot rolling edge crack with orthogonal arrays designed by Taguchi method (L934) and with four control factors brainstormed by the researcher. A: casting speed, B: the amount of cooling water, C: the heating temperature before hot rolling, D: the frequency of hot rolling. Then, the researcher set up the standards to do a crossover trial. Nine research analysis; each group being tested for three times; ninety final products for each test. The control factors of S/N ratio were calculated from by analyzing the research results with the smaller is better of S/N ratio. From such result, the researcher explored the level of influence of the control factor on and the most efficient group condition from the control factors on C2680 copper alloy hot rolling edge crack. Last, the researcher used ANOVA analysis to examine the F-test & Q-test and reliability of research results. The results show that the most efficient group condition from the control factors is “casting speed is 120 mm/min ; the amount of cooling water is 170 m3/hr ; the heating temperature before hot rolling is 850℃ ; the frequency of hot rolling is 21 times. The degree of influence & contribution of the control factor on the cracking of the hot rolling forming in decreasing order are the frequency of hot rolling > casting speed > the amount of cooling water > the heating temperature before hot rolling.
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