| Summary: | 碩士 === 台灣首府大學 === 工業管理學系研究所 === 101 === Abstract
Cast iron milling is a basic and important process. However, the quality of the processing will be significantly affected by the impact of factors such as materials and cutting. Therefore, the best processing conditions and quality plays an important role in the cast iron milling process. In addition, the organized distribution of hardness must be taken into account in material factors. Similarly, the cutting rate, feed rate, cutting depth and cooling also must be taken into account in cutting factors. That is to say, when we engaged in the production of cast iron surface processing, it is a very important topic to improve processing quality, to reduce cost and increase production efficiency simultaneously. Our research explore the object surface milling of cast iron materials (including gray iron and ductile iron) combines the concept of Taguchi parameter design and experiment to discuss the best material factor and cutting conditions.
The results show that all the FC and FCD, two types of cast iron microstructure, are consist of Graphite Phase (G), Ferrite the Iron (α), and Pearlite (P). The hardness level of cast iron will rise by Pearlite’s increasing. According to our Taguchi analysis results of A (spindle speed), B (feed rate), C (depth of cut) and D (cooling / lubrication), we discover these six cast iron with different cutting condition in those interaction. The optimum cutting conditions on six kinds of cast iron is as follows : (1) FC200: A1B2C3D2, (2) FC250: A2B3C3D1, (3) FC300: A2B2C3D2, (4) FCD400: A1B2C1D2, (5) FCD450: A1B2C2D2, (6) FCD500: A1B1C2D1. According to the observation of swarf appearance, SN ratio, surface processing Taguchi analysis and tissue distribution data analysis, we can say that Graphite shape contributes to the difference of these two types of cast iron cutting conditions and machining quality. Moreover, Pearlite and Ferrite content dominate the influence of spindle speed cutting conditions and cooling / lubrication effect. Our research covers the results of cast iron cutting quality factors, optimizing parameters with the dominant mechanism. We strongly expect to provide an reference in the related production process by the results of the above studies.
Key word: Cast iron, Taguchi method, parameter design, milling, orthogonal array.
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