Učinkovitost laserske ablacije pri graviranju z nanosekundnimi laserskimi bliski

zaključna naloga Razvojno raziskovalnega programa I. stopnje Strojništvo

Urh Jurjec (Author), Peter Gregorčič (Mentor), Matija Jezeršek (Co-mentor)

Abstract

Učinkovitost laserske ablacije je pomemben parameter pri graviranju. Ta je v našem primeru definirana kot razmerje med teoretično energijo, ki je potrebna za odstranitev materiala, in energijo, ki smo jo dovedli v obliki svetlobe obdelovalnega laserja. Uporabili smo nanosekundni (12-240 ns) Yb vlakenski vir z valovno dolžino 1060 nm. Obravnavana materiala na preizkusih sta bila v našem primeru nerjavno jeklo in aluminij. Z uporabo različnih kombinacij obdelovalnih parametrov, kot so frekvenca ter časovni potek moči, vršna in povprečna moč laserskih bliskov, smo dobili različne globine ablacije materiala. Iz dobljenih vrednosti smo lahko izračunali spreminjanje učinkovitosti laserske ablacije in izvedli analizo. Tako smo ugotovili, da se učinkovitost spreminja z različnimi pogoji in se posledično osredotočili na optimalne parametre, kjer je bila učinkovitost največja. Učinkovitost smo še dodatno povečali z optimizacijo dodatnih parametrov, kot so: hitrost potovanja laserskega snopa po površini, število prehodov, razmik vzporednih poti potovanja laserskega snopa ter s spremembo strategije graviranja.

Keywords

diplomske naloge;laserska ablacija;nanosekundni laserji;učinkovitost ablacije;aluminij;nerjavna jekla;lasersko graviranje;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[U. Jurjec]
UDC:	621.9.048.7:669.14:669.71(043.2)
COBISS:	16791067
Views:	1107
Downloads:	234
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Laser ablation eficiency during engraving by nanosecond laser pulses
Secondary abstract:	Efficiency of laser ablation is a very important parameter in engraving. In our case it is defined as the ratio between the energy that is theoretically needed for vaporizing a volume of material and the energy of the light radiated by the excitation laser. We used a nanosecond (12-240 ns) Yb fiber laser with a wavelength of 1060 nm. The used materials in our experiment were stainless steel and aluminium. With the use of different parameter combinations like frequency, pulse shape, peak and average power we obtained different material ablation depths. From the acquired data we calculated and analyzed the laser ablation efficiency of the engraving process. We then examined out how the efficiency changes with different conditions and focused on the optimum parameters, that give us the best results. The efficiency we then further increased with optimization of additional parameters, such as scanning speed, number of scans, spacing of scanning lines and scanning strategies.
Secondary keywords:	laser ablation;ablation efficiency;nanosecond lasers;aluminum;stainless steels;laser engraving;
Type (COBISS):	Final paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XV, 43 f.
ID:	11210409