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Evaluation of Hard Coating Performance in Drilling Compacted Graphite Iron (CGI)

机译:钻孔压实石墨铁(CGI)的硬质涂层性能评估

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摘要

The aim of this investigation was to compare the performance of the following commercial coatings system, TiAlN/TiN, AlCrN, and TiSiN/AlCrN, deposited in cemented carbide tools in drilling compact graphite iron (CGI). The drilling tests were conducted adopting two cutting speeds: 80 or 150 m/min. For each test condition, the tool flank wear, the machining feed force, and the circularity and the roughness of the resulting drilled hole were determined. At the cutting speed of 80 m/min, the results revealed that the tool life, in terms of flank wear, was improved for the Cr-based coatings, while the multilayered coatings presented a better performance at the cutting speed of 150 m/min. It was also found that feed force is substantially increased when drilling at a cutting speed of 150 m/min. The holes drilled with the TiSiN/AlCrN at a cutting speed of 150 m/min showed the best circularity. The drill roughness is directly influenced by the coating system wear and iron adhesion. Consequently, it was found that the lowest holes' roughness was obtained with TiSiN/AlCrN at 80 m/min.
机译:这项研究的目的是比较以下商用涂层系统的性能,这些系统沉积在钻探紧凑型石墨铁(CGI)的硬质合金刀具中的TiAlN / TiN,AlCrN和TiSiN / AlCrN。钻孔测试采用两种切削速度:80或150 m / min。对于每种测试条件,都确定了刀具侧面磨损,加工进给力以及所得钻孔的圆度和粗糙度。结果表明,在切削速度为80 m / min时,基于Cr的涂层的刀刃寿命得以改善,而在切削速度为150 m / min时,多层涂层表现出更好的性能。 。还发现以150m / min的切削速度钻孔时进给力显着增加。用TiSiN / AlCrN以150 m / min的切削速度钻出的孔显示出最佳的圆度。钻头的粗糙度直接受涂层系统磨损和铁附着力的影响。因此,发现用TiSiN / AlCrN以80m / min获得最低的孔粗糙度。

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