2909 KB0 KB199920262026Chen, FeiHe, JiantaoLi, ChaoLi, TielinPeng, PengSu, LinzhiZhang, XiaohongZhao, Sishuoštevilka:3/4letnik:72str. 94-105ISSN:0039-2480DOI:10.5545/sv-jme.2025.1449COBISSID_HOST:278102275URN:URN:NBN:SI:doc-UMYYBR47en= Association of Mechanical Engineers and Technicians of Slovenia etc.Zveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikalumina ceramicsaluminijev oksidceramic gearskeramični zobnikilaser polishinglasersko poliranjepicosecond pulsed laserpikosekundni pulzni laserrazdelitev površinesurface partitioningPolishing of alumina ceramic gears by picosecond pulsed laser|Alumina ceramic gears exhibit excellent mechanical properties as well as resistance to high temperatures and corrosion, making them suitable for extreme working conditions that traditional metal gears cannot accommodate. However, their inherent high hardness and brittleness present significant challenges in ensuring high-quality surfaces during molding and manufacturing. In this study, alumina ceramic gears were polished using a picosecond pulsed laser. By proposing a novel alternating superimposed scanning strategy, processing errors were effectively reduced, and surface integrity was enhanced. A univariate experimental approach was used to optimize the key laser processing parameters, including laser power, scanning speed, number of scans, and line spacing. The optimal combination of parameters (7 W power, 220 mm/s scanning speed, 4 scans, and 0.005 mm line spacing) was finally determined to obtain a tooth surface with a surface roughness (Sa) of 1.091 µm (±0.025 µm). Comparative analysis showed that the surface roughness was significantly reduced by 41.93 % to 44.53 % compared with the conventional machining (1.922 µm). In addition, the microhardness of the laser-treated tooth surface increased by 6.36 % and showed improved resistance to tooth chipping under localized high-load conditions. The enhanced surface flatness and mechanical properties significantly improve the meshing performance required for mechanical transmission systems. Notably, the laser surface treatment method significantly reduces the processing cost compared with the traditional mechanical polishing process, providing a cost-effective alternative for ceramic gear molding surface treatment process. This paper innovatively applies laser polishing directly to the tooth surfaces of actual ceramic gears featuring complex curved surfaces, thereby providing crucial process support for their practical application in high-precision transmission systemsKeramični zobniki iz aluminijevega oksida izkazujejo odlične mehanske lastnosti ter odpornost proti visokim temperaturam in koroziji, zaradi česar so primerni za ekstremne obratovalne razmere, ki jih tradicionalni kovinski zobniki ne morejo zagotavljati. Njihova visoka trdota in krhkost predstavljata izzive pri doseganju visoke kakovosti površine med oblikovanjem in izdelavo. Ta raziskava zajema preučevanje možnosti izboljšanja površine keramičnih zobnikov z uvedbo poliranja s pomočjo pikosekundnega pulznega laserja. Z uvedbo nove strategije izmeničnega prekrivnega skeniranja so bile učinkovito zmanjšane obdelovalne napake in izboljšana integriteta površine. Za optimizacijo ključnih parametrov laserske obdelave, vključno z močjo laserja, hitrostjo skeniranja, številom prehodov in razmikom linij, je bil uporabljen enofaktorski eksperimentalni pristop. Optimalna kombinacija parametrov (moč 7 W, hitrost skeniranja 220 mm/s, 4 prehodi in razmik linij 0,005 mm) je omogočila doseganje hrapavosti površine (Sa) 1,091 µm (±0,025 µm). Primerjalna analiza je pokazala, da se je hrapavost površine zmanjšala za 41,93 % do 44,53 % v primerjavi s konvencionalno obdelavo (1,922 µm). Poleg tega se je mikrotrdota lasersko obdelane zobne površine povečala za 6,36 % ter pokazala izboljšano odpornost proti krušenju zob pri lokalno visokih obremenitvah. Izboljšana kakovost površine in mehanske lastnosti bistveno izboljšujejo zahteve v mehanskih prenosnih sistemih. Pomembno je tudi, da metoda laserske površinske obdelave znatno zmanjša stroške obdelave v primerjavi s tradicionalnim mehanskim poliranjem. V članku je inovativno prikazana neposredna uporaba laserskega poliranja na površinah zob dejanskih keramičnih zobnikov s kompleksnimi ukrivljenimi površinami, kar zagotavlja pomembno tehnološko podporo za njihovo uporabo v visoko natančnih prenosnih sistemihTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo