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The effect of the focal length position of the focusing lens on the discoloration roughness of plywood under different CO2 laser engraving modes
Názov The effect of the focal length position of the focusing lens on the discoloration roughness of plywood under different CO2 laser engraving modes Aut.údaje Zhivko Gochev, Pavlin Vitchev Autor Gochev Zhivko Spoluautori Vitchev Pavlin Zdroj.dok. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. Vol. 66, no. 2 (2024), s. 75-87. - Zvolen : Technická univerzita vo Zvolene, 2024 Jazyk dok. angličtina Krajina Slovenská republika Systematika 621.9.048.7:762.1.02 674.031.21 630*832.282 539.211 Heslá CO2 lasery - carbon dioxide lasers * gravírovanie laserom - laser engraving * brezové drevo - birch wood * preglejky - plywoods * drsnosť obrobenej plochy - roughness of worked surface * drsnosť povrchu - surface roughness Anotácia The results of a surface roughness study obtained by CO2 laser engraving of birch plywood specimens are presented in the paper. A ZnSe lens with focal length F = 50.8 mm; focal position ∆F = -4, -6, and -8 mm above the material surface; laser beam power P = 4.0, 5.6, and 7.2 W; laser beam scanning speed vf = 250, 260, and 270 mm/s was used for the research. The roughness of the treated surfaces was measured with an electronic profilometer, model Surftest SJ-210 (Mitutoyo – Japan). The experimental results were evaluated via the parameters Ra, Rq, and Rz and analyzed using specialized software Q-StatLab, ANOVA analysis, and interaction diagrams of all parameters, and relevant conclusions and recommendations were made. The analyses indicate that the surfaces of birch plywood treated with a CO2 laser exhibit higher roughness than untreated ones, with a deviation of 2 to 4 times greater for the Ra parameter and 2.2 to 3.9 times greater for the Rz parameter. The primary reason for the difference in surface roughness of CO2 laser-treated materials at different focusing positions on the surface is the varying laser beam power density. A higher beam power density leads to more significant absorbed heat, resulting in increased surface roughen. URL https://df.tuzvo.sk/sites/default/files/07-02-24_0.pdf Kategória publikačnej činnosti ADN Báza dát xcla - ČLÁNKY Druh dok. RBX - rozpis článkov z periodík Odkazy PERIODIKÁ-Súborný záznam periodika Čísla 2024: 2 
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