Papers by Keyword: Bush Length

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Authors: Lieh Dai Yang, Wei Liang Ku, Han Ming Chow, Der An Wang, Yan Cherng Lin
Abstract: One of the difficulties for Ni-based superalloys application is its manufacturability。Traditional manufacturing process can obtain high strength due to the material characteristic with high strength at high temperature, others like low heat conducting coefficient and process hardening, therefore it could be thought of as a difficult processing material, simultaneously, high temperature drilling could also be resulted in tool wear and broken rapidly, and lead to high process cost。 This study used three Ni-based superalloys such as Mar-M247, Haynes-230 and Inconel-718,applying thermal friction drilling to conduct experiments on the CNC machine using spindle speed and feed rate as process parameters employing Taguchi methods to explore the bush length and internal hole of drilled surface roughness。The results showed that it can generate the longest bush length and best surface roughness for Haynes-230;however Inconel-718 has the largest axial force and worse bush length and surface roughness。
Authors: Wei Liang Ku, Han Ming Chow, Yao Jang Lin, Der An Wang, Lieh Dai Yang
Abstract: The main purpose of this research is to study the optimal machining parameters for a novel process of thermal friction drilling on SUS 304 stainless steel. The experiments were conducted according to an L9 orthogonal array based on Taguchi experimental designs method, and the multiple performance characteristics correlated with surface roughness (SR) and bush length (BL) was investigated by grey relational analysis systematically and comprehensively. Moreover, the significant machining parameters that most intensively affected the multiple performance characteristic and the optimal combination levels of machining parameters associated with the thermal friction drilling on SUS 304 stainless steel were determined through the analysis of variance (ANOVA) and the response graph of grey relational grade. The main machining parameters of the thermal friction drilling such as friction angle, friction contact area ratio, feed rate, and drilling speed were selected to evaluate the effects on SR and BL. The experimental results show that the thermal friction drilling revealed beneficial effects on SR and BL for drilling processes. Moreover, the optimal machining parameters for multiple performance characteristics associated with SR and BL were attained. The developed thermal friction drilling avoids serious tool wears, enhances the surface quality of the machined hole, and prolongs the tool life significantly.
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