20.500.12556/RUL-179281 Experimental investigation on laser machining of microfluidic channels in micro mold inserts Laser micromachining is an effective technique for fabricating intricate microfeatures with high precision and minimal thermal deformation. In this study, micropillars were fabricated on P20 steel injection mould inserts for microfluidic channel applications using a CO▫$_2$▫ laser machining system. The primary objective of this work is to optimize laser machining parameters to achieve high dimensional accuracy and stable material removal during micropillar fabrication. Laser speed, laser power, and pulse frequency were selected as key input parameters influencing the geometrical accuracy and performance of the microstructures. An optimal combination of laser speed 525 mm s▫$^{-1}$▫, power 32 W, and frequency 23 kHz was identified, resulting in highly repeatable micropillar geometry. The fabricated micropillars exhibited low dimensional variation, with length and width variations limited to 0.5% and 1.9%, respectively, while the material removal rate showed a variation of 3.0%, indicating consistent machining performance. Overall, the results demonstrate that appropriate optimization of laser parameters enables precise and repeatable fabrication of micropillars on P20 mold inserts, highlighting the suitability of laser micromachining for producing high-quality micro mold inserts for injection- molded microfluidic applications. Lasersko graviranje je učinkovita tehnologija izdelave kompleksnih mikrostruktur z visoko natančnostjo in minimalnimi toplotnimi vplivi. V raziskavi smo na orodnih iz jekla P20 na orodnih vložkih za brizganje plastike izdelali mikrostebričke v mikrofluidniih kanalih z uporabo CO▫$_2$▫ laserskega sistema. Glavni cilj je bil optimirati parametre laserske obdelave za doseganje visoke dimenzijske natančnosti in stabilnega odvzema materiala. Kot ključne vhodne parametre smo izbrali hitrost laserskega pomika, lasersko moč in frekvenco pulzov. Določena je bila optimalna kombinacija: hitrost 525 mm s▫$^{-1}$▫, moč 32 W in frekvenca 23 kHz, ki zagotovlja natančno in ponovljivo izdelano geometrijo mikrostebričkov. Izdelani mikrostebrički izkazujejo nizko dimenzijsko variabilnost (odstopanja dolžine do 0,5 % in širine do 1,9 %), variacija hitrosti odnašanja materiala pa znaša 3,0 %. Rezultati potrjujejo, da ustrezna optimizacija vhodnih parametrov omogoča natančno in ponovljivo izdelavo mikrostebričkov na vložkih iz P20, ter tako dokazujemo primernost laserskega gravoranja za izdelavo kakovostnih orodnih vložkov. micropillars laser micromachining experimental design optimization mould insert mikrostebrički lasersko graviranje načrtovanje eksperimentov optimizacija orodni vložek true false true Angleški jezik Slovenski jezik Članek v reviji 2026-02-10 08:36:13 2026-02-10 08:36:21 2026-02-12 03:39:18 0000-00-00 00:00:00 2026 0 0 10 str. no. 3, art. 035504 Vol. 8 2026 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 535:655.225.2 2631-8695 10.1088/2631-8695/ae39b0 267559171 RAZ_Anthuvan_Naveen_2026.pdf RAZ_Anthuvan_Naveen_2026.pdf 1 1715A869E60A1A905166B1251D803DF6 fb67b91f21201b491c73fca7a82f8a65498e3780f9721d756f2095d1bbcf29e3 a160e1a4-0653-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=227640 https://iopscience.iop.org/article/10.1088/2631-8695/ae39b0 1 0f21cb7d-0653-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=227639 Fakulteta za strojništvo 0 0 0