High chrome white cast iron is particularly preferred in the production of machine parts requiring high wear resistance. Although the amount of chrome in these materials provides high wear and corrosion resistances, i...High chrome white cast iron is particularly preferred in the production of machine parts requiring high wear resistance. Although the amount of chrome in these materials provides high wear and corrosion resistances, it makes their machinability difficult. This study presents an application of the grey relational analysis based on the Taguchi method in order to optimize chrome ratio, cutting speed, feed rate, and cutting depth for the resultant cutting force (Fr) and surface roughness (Ra) when hard turning high chrome cast iron with a cubic boron nitride (CBN) insert. The effect levels of machining parameters on Fr and Ra were examined by an analysis of variance (ANOVA). A grey relational grade (GRG) was calculated to simultaneously minimize Fr and Ra. The ANOVA results based on GRG indicated that the feed rate, followed by the cutting depth, was the main parameter and contributed to respo ses. Optimal levels of parameters were found when the chrome ratio, cutting speed, feed rate, and cutting depth were 12%, 100m/min, 0.05mm/r, and 0.1mm, respectively, based on the multiresponse optimization results obtained by considering the maximum signal to noise (SIN) ratio of GRG. Confirmation results were verified by calculating the confidence level within the interval width.展开更多
随着纳米科技的不断发展,核心功能器件的纳米制造作为相关设计与应用研究的桥梁和基础,其研究价值的重要性日益凸显。聚焦离子束(Focused ion beam,FIB)加工是面向纳米尺度制造的一项重要技术。在概述FIB工作原理的同时,介绍FIB纳米加...随着纳米科技的不断发展,核心功能器件的纳米制造作为相关设计与应用研究的桥梁和基础,其研究价值的重要性日益凸显。聚焦离子束(Focused ion beam,FIB)加工是面向纳米尺度制造的一项重要技术。在概述FIB工作原理的同时,介绍FIB纳米加工方法与关键工艺的发展状况,就溅射产额、再沉积和FIB纳米直写方法等展开讨论。并介绍FIB纳米加工技术在纳米功能器件制造和基础研究等领域的典型应用。对其未来的发展从装备和机理研究的角度进行了展望。展开更多
文摘High chrome white cast iron is particularly preferred in the production of machine parts requiring high wear resistance. Although the amount of chrome in these materials provides high wear and corrosion resistances, it makes their machinability difficult. This study presents an application of the grey relational analysis based on the Taguchi method in order to optimize chrome ratio, cutting speed, feed rate, and cutting depth for the resultant cutting force (Fr) and surface roughness (Ra) when hard turning high chrome cast iron with a cubic boron nitride (CBN) insert. The effect levels of machining parameters on Fr and Ra were examined by an analysis of variance (ANOVA). A grey relational grade (GRG) was calculated to simultaneously minimize Fr and Ra. The ANOVA results based on GRG indicated that the feed rate, followed by the cutting depth, was the main parameter and contributed to respo ses. Optimal levels of parameters were found when the chrome ratio, cutting speed, feed rate, and cutting depth were 12%, 100m/min, 0.05mm/r, and 0.1mm, respectively, based on the multiresponse optimization results obtained by considering the maximum signal to noise (SIN) ratio of GRG. Confirmation results were verified by calculating the confidence level within the interval width.
文摘随着纳米科技的不断发展,核心功能器件的纳米制造作为相关设计与应用研究的桥梁和基础,其研究价值的重要性日益凸显。聚焦离子束(Focused ion beam,FIB)加工是面向纳米尺度制造的一项重要技术。在概述FIB工作原理的同时,介绍FIB纳米加工方法与关键工艺的发展状况,就溅射产额、再沉积和FIB纳米直写方法等展开讨论。并介绍FIB纳米加工技术在纳米功能器件制造和基础研究等领域的典型应用。对其未来的发展从装备和机理研究的角度进行了展望。
