Optimiranje proizvodnje drogov iz aluminijeve zlitine 6082 visoke kvalitete

Premužić, Tomaž (author), Vončina, Maja (mentor)

Aluminijeva zlitina AA 6082 se uporablja za različne namene v gradbeništvu, strojništvu, avtomobilski industriji ipd. Dolgoletne izkušnje uporabe zlitine AA 6082 v komercialne namene so pokazale, da je ta zlitina odporna na vremenske vplive brez zaščitnih prevlek. V proizvodnem procesu izdelave zlitine na kvaliteto končnega izdelka vpliva veliko faktorjev in sicer: delež založenega primarnega in sekundarnega aluminija v talilno peč, obdelava taline, čiščenje taline v peči, udrobnjevanja taline, čiščenja taline izven peči, procesnih parametrov pri litju in pogojev homogenizacije drogov. Primerjali smo meritve in rezultate preiskav iz dveh šarž aluminijeve zlitine AA 6082 pred in po predelavi livnega sistema. Za karakterizacijo preiskovane aluminijeve zlitine AA 6082 visoke kvalitete in doseganje ustrezne mikrostrukture na drogovih premera 228 mm so bile opravljene naslednje meritve in preiskovalne metode: temperaturne meritve, kemijska analiza, termodinamična simulacija faznih ravnotežij (ThermoCalc), diferenčna vrstična kalorimetrija (DSC), optična mikroskopija in elektronska mikroskopija. Ugotovili smo, da je za doseganje ustrezne mikrostrukture po celotni dolžini droga zlitine AA 6082 potrebno zagotoviti višjo temperaturo taline na začetku litja. Namen magistrskega dela je bil izdelava drogov zlitine AA 6082 dolžine 7000 mm z minimalnim izmetom, oziroma znižanje tehnološkega izmeta, kar pomeni boljšo stroškovno učinkovitost in konkurenčnost na trgu. To lahko dosežemo z dodatnimi izolacijskimi pokrovi, ki imajo na spodnji strani električne grelce.

• Language: Slovenian
• Keywords: zlitina AA 6082, obdelava taline, drogovi, homogenizacija, mikrostruktura
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2017
• PID: 20.500.12556/RUL-92520
• Publication date in RUL: 06.06.2017

Secondary language

• Language: English
• Title: Optimization of billets production from high-quality aluminum alloy 6082

Abstract

The aluminum alloy AA 6082 is used for various purposes in the construction industry, mechanical engineering, automotive industry, etc. Many years of experience in the application of the alloy AA 6082 commercial purposes have shown that this alloy is resistant to weathering without protective coatings. In the production process of manufacturing aluminum alloy AA 6082 on the quality of the final product is influenced by many factors, namely: what is the proportion of stocked primary and secondary aluminum into the melting furnace, what is the treatment of the melt, what is the treatment of the melt in the furnace, modification agent added to the melt, how is the cleaning of the melt outside the furnace, what are the parameters of the casting process and the conditions under which the billets are homogenized. We compared the measurements and the results of investigations of two batches of cast aluminum alloy AA 6082 before and after the remodeling of the casting system. For the characterization of the investigated aluminum alloy AA 6082 of high quality and to achieve appropriate microstructure on billets of 228 mm diameter the following measurements and investigation methods were used: temperature measurement, chemical analysis, thermodynamic simulation of phase equilibria (ThermoCalc), differential scanning calorimetry (DSC) optical microscopy and electron microscopy. We have found that to achieve the appropriate microstructure over the entire length of the rod alloy AA 6082 it is necessary to provide a higher temperature of the melt at the start of the casting. The purpose of the master’s thesis was to casting billets alloy AA 6082 length 7000 mm with minimal ejection, which means better cost efficiency and market competitiveness. This can be achieved by additional insulating covers having the electric heaters at the lower side.

• Keywords: AA 6082, melt processing, billets, homogenization, microstructure