Vpliv procesnih parametrov na lasersko strukturiranje površine Ti-6Al-4V

Koščak, Tilen (author), Klobčar, Damjan (mentor)

V delu je obravnavan vpliv procesnih parametrov laserskega graviranja na material Ti-6Al-4V. Izdelali smo vzorce z Nd-YAG laserskim gravirnim strojem, kjer smo testirali vpliv procesnih parametrov. Lasersko graviranje je potekalo z izdelavo testne mreže točk. Točke smo nato analizirali in zmerili z digitalnim mikroskopom. Ugotovili smo, da najnižja jakost toka, kjer laser še pretali titanovo zlitino Ti-6Al-4V, znaša 35 A, če pa želimo ustvariti lepo viden krater, je potrebna jakost toka vsaj 40 A ali več. Zviševanje toka povečuje premer nastalega kraterja, nima pa preveč očitnega vpliva na globino kraterja. Maksimalna frekvenca, kjer laser še pretali titanovo zlitino Ti-6Al-4V, je okoli 15 kHz, če pa želimo lep okrogel krater, s konstantnim premerom, naj bo frekvenca 10 kHz ali manj. Zniževanje frekvence pod 10 kHz v neki meri povečuje premer nastalega kraterja, bolj pa je očitno povečanje globine kraterja. Pri frekvenci 15 kHz je dolžina pulza tako kratka, da tudi zviševanje jakosti toka praktično nima vpliva na premer ali globino kraterja. Zniževanje frekvence pod 500 Hz ni smiselno, saj s tem zelo povečamo čas izdelave, kraterji pa se od te meje naprej ne povečujejo več. Minimalno število potrebnih pulzov, da naš laser pretali material in naredi krater, je 5 pulzov. Zviševanje števila pulzov nima vpliva na premer kraterja, ima pa velik vpliv na zviševanje globine kraterja.

• Language: Slovenian
• Keywords: lasersko graviranje, parametri laserskega graviranja, titanova zlitina Ti-6Al-4V, Nd-YAG laser, analiza z digitalnim mikroskopom
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [T. Koščak]
• Year: 2021
• Number of pages: XIII, 25 str.
• PID: 20.500.12556/RUL-130360
• UDC: 621.9.048.7:669.295(043.2)
• COBISS.SI-ID: 84370435
• Publication date in RUL: 14.09.2021

KOŠČAK, Tilen, 2021, Vpliv procesnih parametrov na lasersko strukturiranje površine Ti-6Al-4V [online]. Bachelor’s thesis. Ljubljana : T. Koščak. [Accessed 16 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=130360

Secondary language

• Language: English
• Title: Influence of process parameters on laser surface structuring of Ti-6Al-4V

Abstract

This paper discusses the influence of laser etching process parameters on Ti-6Al-4V material. We made samples with an Nd-YAG laser engraving machine, where we tested the influence of process parameters. In the laser engraving process, we created a small grid of dots. The dots were then analyzed and measured using a digital optical microscope. We found that the lowest current, where the laser still melted the surface of titanium alloy Ti-6Al-4V, is 35 A, but if we want to create a clearly visible crater, a current of at least 40 A or more is required. Increasing current increases the diameter of the resulting crater but does not have too obvious an effect on the crater depth. The highest frequency where the laser still melts the surface of titanium alloy Ti-6Al-4V is around 15 kHz, but if we want a round crater with a constant diameter, the frequency should be 10 kHz or less. Decreasing the frequency below 10 kHz increases the diameter of the resulting crater to some extent, but the increase in crater depth is more obvious. At a frequency of 15 kHz, the pulse length is so short that even increasing the current strength has virtually no effect on the diameter or depth of the crater. Reducing the frequency below 500 Hz does not make sense, as this greatly increases the production time, and the craters no longer increase in size from this point onwards. The minimum number of pulses required for our laser to melt the material and make a crater is 5 pulses. Increasing the number of pulses has no effect on the diameter of the crater but has a large effect on increasing the depth of the crater.

• Keywords: laser engraving, parameters of laser engraving, titanium alloy Ti-6Al-4V, Nd-YAG laser, microscope analysis