Graviranje kovin z vlakenskim laserjem s spremenljivo dolžino bliskov

Ortar, Jernej (author), Gregorčič, Peter (mentor), Jezeršek, Matija (comentor)

Lasersko graviranje predstavlja alternativo konvencionalnim metodam graviranja. Proces laserskega graviranja določajo različni parametri obdelave, kombinacijo katerih je potrebno izbrati tako, da z njimi dosežemo željeno končno stanje obdelovanca. V zaključni nalogi smo raziskovali vplive različnih parametrov na velikost odstranjene prostornine in energetsko učinkovitost procesa. Učinkovitost smo vrednotili kot razmerje med odstranjeno prostornino in vneseno energijo na površino. Raziskali smo vplive prekrivanja bliskov, prekrivanja mikrokanalov, dolžine trajanja bliskov in vpliv različnih strategij graviranja. Gravirali smo s šrafiranjem vzorčne površine pod kotom 0° (vzporedno šrafiranje), kotoma 0° in 90° (pravokotno šrafiranje) in koti 0°, 45°, 18°, 71° (»zlati koti«). Vizualno smo ovrednotili površino obdelovancev za vsako od strategij graviranja. Dolžine trajanja bliskov smo spreminjali med 50 ns, 120 ns in 240 ns. Ugotovili smo, da se količina odstranjenega materiala bistveno poveča s povečevanjem prekritosti bliskov ter mikrokanalov. Prav tako je količina odstranjenega materiala znatno večja, če graviramo z daljšimi bliski. Dolžina bliska je prav tako prispevala k učinkovitosti graviranja, najbolj učinkovito je bilo graviranje z bliski dolžine 120 ns. Strategije graviranja imajo manjši vpliv na odstranjen material, hkrati pa določajo obliko mikroreliefa obdelane površine.

• Language: Slovenian
• Keywords: laserska ablacija laserske obdelave lasersko graviranje nanosekundni vlakenski laser laserski inženiring površin nerjavno jeklo
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Publisher: [J. Ortar]
• Year: 2018
• PID: 20.500.12556/RUL-103113
• UDC: 621.9.048.7:669.14.018.8(043.2)
• COBISS.SI-ID: 16282907
• Publication date in RUL: 14.09.2018

Secondary language

• Language: English
• Title: Engraving of metals by a fiber laser with different pulse duration

Abstract

Laser engraving is an alternative to conventional engraving methods. The laser engraving process is determined by different processing parameters, which are to be selected so as to achieve the desired final state of the workpiece. In this thesis we investigated the effects of various parameters on the amount of the removed volume and the energy efficiency of the process. The efficiency was defined as the ratio between the removed volume and the total energy per area. We investigated the effects of overlapping of pulses, overlapping of microchannels, duration of pulses and influence of different engraving strategies. We were engraving by hatching the sample areas at angle of 0° (parallel hatching), angles 0° and 90° (orthagonal hatching) and angles 0°, 45°, 18°, 71° (“magic angles”). We have visually evaluated the surface of the workpieces for each of the engraving strategies. The lengths of the pulse duration were changed between 50 ns, 120 ns and 240 ns. We found that the amount of material removed is substantially increased by increasing the overlap of the pulses and microchannels. Also, the amount of material removed is considerably larger if we engrave with longer ones. The duration of pulse also contributed to the efficiency of the engraving, the most effective was the engraving with the pulse duration of 120 ns. Engraving strategies have less impact on the material removal, but the significantly determine the shape of the microrelief of the processed surface.

• Keywords: laser ablation laser processing laser engraving nanosecond fiber laser laser surface engineering stainless steel