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Inhomogeneity of CoCrW powder products manufactured by SLM technology
Anna Guzanová,Dagmar Draganovská,Gabriela Ižaríková,Janette Brezinová,Viktória Rajťúková,Jozef Živčák,Radovan Hudák,Erik Janoško,Róbert Moro 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
The article deals with selective laser melting process using CoCrW powder. Our aim was to identify the influence of product position on the building platform and the re-use of powder on roughness, hardness, porosity and corrosion properties of materials, made under uniform process parameters. Roughness was tested with a stylus profilometer, corrosion resistance by electrochemical impedance spectroscopy and linear polarization. Porosity was assessed by image analysis on metallographic sections taken in two mutually perpendicular directions. The same metallographic sections were used to measure microhardness. The results confirmed a statistically significant dependence of the surface roughness with the position on the platform as well as with the recycling of the powder used. The corrosion resistance of the materials was excellent. Increased porosity values and lower hardness occurred in the middle of the building platform. The reason for the variation of the properties within the building platform can be seen in the unequal laser input energy in the individual positions of the plate.
A case study of gear wheel material and heat treatment effect on gearbox strength calculation
Silvia Maláková,Anna Guzanová,Dagmar Draganovská,Gabriel Fedorko,Vieroslav Molnár 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.12
The paper is focused on the influence of gearing material and thermal or chemical-thermal processing of wheels on the results of the strength calculation carried out in accordance to the standard, in particular on the safety factor. This effect is examined on a gearbox that was part of the steel coil production line in the integrated steel plant. Due to changes in production, the load on the gears increased. Thus, the result of this work is the selection of new materials for the two-speed gearbox and their heat treatment to meet the safety conditions of the gearing mechanism without changing the geometrical parameters of the gearbox.