magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Žiga Tomažič (Author), Joško Valentinčič (Mentor), Andrej Lebar (Co-mentor)

Abstract

Proizvodne procese stalno razvijamo in optimiziramo za doseganje boljših rezultatov v smislu kvalitete izdelkov in časa izdelave ter posledično stroškov in cene proizvoda. S tem ostajamo konkurenčni na trgu. Klasične obdelovalne postopke so raziskovalci že v preteklosti poizkušali izboljšati s postopkom kriogenega ohlajanja obdelovanca, v tem delu pa smo želeli na enak način izboljšati proces obdelave z abrazivnim vodnim curkom (AVC). Vpliv temperature smo ugotavljali za obdelavo aluminijeve zlitine AlMg4,5Mn0,7 in nerjavnega jekla X5CrNi18-10. Med rezanjem smo merili temperaturo vzorcev na različnih mestih obdelovanca vzdolž obdelovalne cone. Primerjali smo učinkovitost odnašanja materiala pri podhlajenih vzorcih in vzorcih na sobni temperaturi; izdelali smo gravuro na površini vzorca in primerjali količino erodiranega materiala, ki smo jo izračunali kot razliko v masi vzorca pred in po graviranju. Nadalje smo se osredotočili na doseženo hrapavost površine reza podhlajenih in nepodhlajenih vzorcev. Hrapavost smo merili s pomočjo digitalnega mikroskopa. Statistično smo potrdili pozitiven vpliv kriogenih temperatur na učinkovitost obdelave aluminijeve zlitine, pozitivnega vpliva na učinkovitost obdelave nerjavnega jekla in na kakovost površine za oba materiala pa nismo potrdili.

Keywords

magistrske naloge;abrazivni vodni curek;rezanje;graviranje;kriogena obdelava;tekoči dušik;učinkovitost procesa;hrapavost površine;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [Ž. Tomažič]
UDC: 621.9.04:536.483(043.2)
COBISS: 186018563 Link will open in a new window
Views: 176
Downloads: 20
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Other data

Secondary language: English
Secondary title: Influence of cryogenic cooling on the process of abrasive water jet cutting
Secondary abstract: We are continuously developing and optimising production processes to achieve better results in terms of product quality, production time, and consequently, product cost and price. By taking this into consideration, we strive to uphold our competitive capabilities in the market. In the past, researchers have tried to improve conventional machining processes by employing cryogenic cooling of the workpiece, but we wanted to use the same method to improve the process of machining with an abrasive water jet (AWJ). We determined the effect of the temperature on the machining of aluminium alloy AlMg4,5Mn0,7 and stainless steel X5CrNi18-10. While machining, we measured the temperature of the workpieces at various points along the machining zone. We compared the erosion efficiency of the samples that were undercooled as well as those that were at room temperature. We engraved the surface of every workpiece and compared the amount of the eroded material, which was calculated as the difference in the mass of the workpiece before and after it was engraved. We then focused on the surface roughness of the samples that were undercooled and those that were not. The roughness was measured by using a digital microscope. We statistically confirmed the positive effect of cryogenic cooling on the effectiveness of the machining of the aluminium alloy. However, we did not prove a positive effect on either the efficacy of machining of stainless steel or the quality of the surface of both materials.
Secondary keywords: master thesis;abrasive water jet;cutting;engraving;cryogenic machinig;liquid nitrogen;proccess efficiency;surface roughness;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXII, 58 str.
ID: 21950137
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