Utjecaj učinka egzotermnog pojila na napajanje prirubnice od aluminijeve legure

master's thesis

• Title (english): Influence of the exothermic riser feeding effect on the feeding of the aluminium alloy flange
• Author: Matea Obrovac
• Mentor: Branko Bauer (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-12-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

Ovaj rad obrađuje osnove tehnologije lijevanja aluminijevih legura s naglaskom na osnovne karakteristike strujanja i skrućivanja rastaljenog metala u kalupnoj šupljini sa svrhom boljeg razumijevanja najčešćih grešaka koje se javljaju u odljevcima. Objašnjeni su dijelovi uljevnog sustava, kao i smjernice za njegovu konstrukciju. Obrađena su i svojstva najčešće korištenih aluminijevih legura u ljevarstvu te postupak lijevanja u pješčani kalup. U eksperimentalnom dijelu rada proveden je proračun uljevnog sustava za lijevanje prirubnice od aluminijeve legure AlSi12 te je napravljen 3D model odljevka i njegovog uljevnog sustava. Cilj je istražiti kakav utjecaj na kvalitetu odljevka ima različit način lijevanja obzirom na orijentaciju odljevka i različito napajanje te kakav je u tom slučaju utjecaj korištenja egzotermnih obloga na pojilima. Koristeći 3D modele za tri različita slučaja lijevanja prirubnice, provedene su simulacije lijevanja u programu ProCAST sa svrhom otkrivanja potencijalnih grešaka i usporedbe različitih pristupa. Nakon dobivenih rezultata simulacije, provedena je njihova analiza, s naglaskom na utjecaj učinka egzotermnih pojila na napajanje odljevka. U konačnici, dan je prijedlog poboljšanja uljevnog sustava i sustava napajanja kako bi se postojeće greške uklonile ili minimizirale.

Abstract (english)

This thesis covers the fundamentals of aluminium alloy casting technology, with a focus on the key characteristics of molten metal flow and solidification within the mould cavity, aiming to enhance the understanding of common defects that occur in castings. The components of the gating system were explained, along with guidelines for its design. The properties of the most commonly used aluminium alloys in casting and the process of sand casting were also described. In the experimental part of the thesis, the calculation of the gating system for casting an aluminium alloy flange made of AlSi12 was described, along with the creation of a 3D model of the casting and its gating system. The aim was to investigate the influence of different casting approaches on the quality of the casting, considering the orientation of the casting and varying feeding systems, as well as the effect of using exothermic sleeves on feeders in such scenarios. Using 3D models for three different approaches to flange casting, simulations were performed in the ProCAST software to identify potential defects and perform a comparative analysis. After obtaining the simulation results, the analysis was conducted with a focus on the impact of exothermic riser feeding effect on the feeding of the flange. Finally, recommendations for improving the gating and feeding systems were provided to eliminate or minimize shrinkage porosity.

• Keywords: lijevanje; uljevni sustav; aluminijeve legure; simulacija lijevanja; egzotermna pojila
• Keywords (english): casting; gating system; aluminium alloys; casting simulation; exothermic risers
• Language: croatian
• URN:NBN: urn:nbn:hr:235:631331
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechanics and Robotics, Autonomous Systems, Mechatronics and Robotics; Course: Production Engineering; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva (sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-12-03 18:19:32