Utjecaj orijentacije odljevka u kalupu na pojavu poroznosti skupljanja

master's thesis

• Title (english): Influence of the casting orientation in the mould on the occurrence of shrinkage porosity
• Author: Ivan Zovko
• Mentor: Branko Bauer (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-12-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U teorijskom dijelu rada opisane su tehnologije lijevanja aluminijskih legura. U prvom je dijelu opisana legura AlSi12 i utjecaj legirnih elemenata na svojstva aluminijskih legura. Također, navedene su i eventualne greške u odljevcima koje se mogu pojaviti prilikom lijevanja.
U eksperimentalnom dijelu rada istraživan je utjecaj orijentacije odljevka u kalupu na pojavu poroznosti skupljanja. Za odabrani su odljevak proračunate i konstruirane dvije varijante horizontalnog i dvije varijante vertikalnog uljevnog sustava. Simulacija lijevanja provedena je u programskom paketu ProCAST, a analizom su iste dana konstrukcijska poboljšanja.
Lijevanje odljevaka provedeno je u Laboratoriju za ljevarstvo Fakulteta strojarstva i brodogradnje Sveučilišta u Zagrebu. Odljevci su nakon hlađenja i skrućivanja ispitani radiografskom metodom. Rezultati ispitivanja radiografskom metodom uspoređeni su s rezultatima simulacije. Snimljeni su radiogrami ukazali na pojavu plinske poroznosti i poroznosti skupljanja u svim odljevcima. Najbolja se pokazala varijanta lijevanja s direktnim vertikalnim uljevnim sustavom.

Abstract (english)

In the theoretical part of the thesis, casting technologies for aluminium alloys were described. In the first part, the alloy AlSi12 and the influence of alloying elements on the properties of aluminium alloys were described. In addition, possible defects in castings that may occur during casting were listed.
In the experimental part of the work, the influence of the casting orientation in the mould on the occurrence of shrinkage porosity was investigated. Two variants of the horizontal and two variants of the vertical gating system were calculated and designed for the selected casting. The casting simulation was performed using the ProCAST software package and design improvements were indicated.
Casting was carried out in the Foundry Laboratory of the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb. After cooling and solidification, the castings were examined using radiographic testing. The results of the radiographic test were compared with the simulation results. The recorded radiographs showed the occurrence of gas porosity and shrinkage porosity in all castings. The direct vertical casting method produced the best casting.

• Keywords: lijevanje; aluminij; poroznost; uljevni sustav
• Keywords (english): casting; aluminium; porosity; gating system
• Language: croatian
• URN:NBN: urn:nbn:hr:235:020900
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-12-13 18:28:23