Analiza obrabe obrezilnih orodij za tlačno lite izdelke iz aluminija

Pocek, Vid (author), Pepelnjak, Tomaž (mentor), Čekada, Miha (comentor)

V magistrski nalogi je predstavljen primerjalni preizkus obrabe rezilnega segmenta orodja za obrez tlačnih ulitkov iz aluminijevih zlitin. Napravili smo primerjalni preizkus obrabe segmenta s trdo prevleko in obrabe segmenta brez nje. Naloga obravnava serijski strojni obrez ulitkov na hidravlični stiskalnici z rezilnim segmentom brez prevleke ter z rezilnim segmentom s prevleko, mikroskopsko analizo rezilnega roba in merjenje profila površine segmenta s profilometrom. Meritve in analize segmentov smo izvedli pred začetkom preizkusa, po 50.000 in po 75.000 proizvodnih ciklih. Več vmesnih analiz nam realni proizvodni proces ni dopuščal. Na podlagi izvedenih analiz in meritev smo naredili primerjavo obrabe obeh segmentov. Ugotovili smo, da pri uporabi trde prevleke v procesu ni težav. Dokazali smo, da se rezilni segment brez prevleke obrablja v večji meri kot segment s prevleko. Z meritvami smo ugotovili, da je trda prevleka preprečila tvorjenje sprimkov na rezilnem segmentu ter da se je po 50.000 proizvodnih ciklih prevleka na nekaterih mestih zaradi obrabe odluščila od osnovnega materiala, ostanki srha na rezilnem robu pa lahko bistveno vplivajo na obstojnost prevleke. Obraba segmenta s prevleko je bila tudi po 75.000 proizvodnih ciklih manjša od obrabe segmenta brez prevleke po 50.000 proizvodnih ciklih.

• Language: Slovenian
• Keywords: aluminijeve zlitine, tlačni livarski stroji, tlačno litje, ulitki, obrezilna orodja, strojni obrez, obraba orodij, trde prevleke, trda prevleka aCN
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Publisher: [V. Pocek]
• Year: 2017
• PID: 20.500.12556/RUL-98466
• UDC: 620.1:621.74:669.71(043.2)
• COBISS.SI-ID: 15833883
• Publication date in RUL: 03.12.2017

POCEK, Vid, 2017, Analiza obrabe obrezilnih orodij za tlačno lite izdelke iz aluminija [online]. Master’s thesis. V. Pocek. [Accessed 21 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=98466

Secondary language

• Language: English
• Title: Wear Analysis of Aluminium Die Cast Trimming Tools

Abstract

The thesis deals with a comparison test of aluminium alloys die cast trimming tools wear. The wear of the trimming segments with and without hard coating was examined. The serial trimming process using a hydraulic press with the segment without the coating and the segment with the coating, as well as microscopic and profile measurements are presented. Both segments were analysed before the test, after 50.000, and after 75.000 production cycles; the real production process made additional analyses impossible. After measurements and analysis, the wear comparison of both segments was examined. It was concluded that the use of hard coating did not cause any problems in the trimming process. It was concluded that the wear of the segment without coating was much more extensive than the wear of the segment with the coating. The measurements proved that the hard coating prevented the formation of build-up edges on the segment surface, and that after 50.000 production cycles the hard coating started to peel off from the basic material of the segment, and that the remaining burrs on the cutting edge could have a major influence on durability of coating. It was established that the wear of the segment with the coating even after 75.000 production cycles was smaller than the wear of the segment without the coating after 50.000 production cycles.

• Keywords: aluminium alloys, high pressure die casting, castings, trimming tools, trimming process, tool wear, hard coatings, aCN hard coating