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Surface texture formation in precision machining of direct laser deposited tungsten carbide

Advances in Manufacturing 2017年第3期5卷 251-260页

作者： Szymon Wojciechowski Zbigniew Nowakowski Radomir Majchrowski grzegorz krolczyk Faculty of Mechanical Engineering Poznan University of Technology Piotrowo 3 Poznan 60-965 Poznan Poland Opole University of Technology Proszkowska 7645-758 Opole Poland

This paper focuses on an analysis of the surface texture formed during precision machining of tungsten carbide. The work material was fabricated using direct laser deposition （DLD） technology. The experiment included precision milling of tungsten carbide samples with a monolithic torus cubic boron nitride tool and grinding with diamond and alumina cup wheels. An optical surface profiler was applied to the measurements of surface textures and roughness profiles. In addition, the micro-geometry of the milling cutter was measured with the appli- cation of an optical device. The surface roughness height was also estimated with the application of a model, which included kinematic-geometric parameters and minimum uncut chip thickness. The research revealed the occurrence of micro-grooves on the machined surface. The surface roughness height calculated on the basis of the traditional kinematic-geometric model was incompatible with the measurements. However, better agreement between the theoretical and experimental values was observed for the minimum uncut chip thickness model.

关键词： Surface texture - Precision machining ·Tungsten carbide · Direct laser deposition (DLD)

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Assessment of internal defects of hardfacing coatings in regeneration of machine parts

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Journal of Central South University 2018年第5期25卷 1144-1153页

作者： Jerzy JOZWIK Krzysztof DZIEDZIC Ireneusz USYDUS Dawid OSTROWSKI grzegorz M krolczyk Faculty of Mechanical Engineering Lublin University of Technology Electrical Engineering and Computer Science Faculty Lublin University of Technology Institute of Technical Sciences and Aviation State School of Higher Education Faculty of Mechanical Engineering Opole University of Technology

This paper presents the use of computed tomography for the evaluation of hardfacing. The method used in this research is hardfacing by tungsten inert gas using alloy wires of wear resistant layers. This paper discusses the latest materials used for hardfacing and their application. It characterizes the defects of obtained hardfacing and impact of the type of wire on the concentration of defects. It further, the basic mechanical properties of coatings were determined. The results are subjected to qualitative and quantitative analysis. The smallest average percentage of defects in relation to the overall surface is observed for the hardfacing EL-600 HB, which amounts to 1.5%. The highest average percentage of defects in relation to the overall surface is observed for the hardfacing EL-500 HB, which amounts to 7.2%. The chemical composition of hardfacing has been presented.

关键词： hardfacing coating tomography welding defects

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