Utjecaj tehnologije tlačnog lijevanja na pojavu poroznosti u odljevku

master's thesis

• Title (english): Influence of high pressure die casting technology on shrinkage porosity of the casting
• Author: Ivan Mikulić
• Mentor: Branko Bauer (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-12-07, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U ovom radu opisana je tehnologija tlačnog lijevanja. Nakon toga opisani su parametri procesa kojima se direktno utijeće na proces lijevanja, te svojstva odljevka. Uz to je opisan postupak određivanja parametara. Dalje su opisani kalupi za tlačni lijev, klasifikacija kalupa, njihovi osnovni dijelovi te materijali od kojih se izrađuju. Nakon toga slijedi odlomak o najčešćim legurama aluminija koje se koriste kod procesa tlačnog lijevanja, posebno legura AlSi9Cu3 koja je korištena za izradu odljevka na kojem su se vršila ispitivanja. Nakon legura dan je opis peći za taljenje materijala, točnije plinske koritaste plamene peći za taljenje aluminijskih legura, koja je ujedeno i korištena za dobivanje taline u promatranom procesu koji se opisuje naknadno u eksperimentalnom dijelu. Također je opisana i poroznost kao jedan od najčešćih problema koji se pojavljuju u odljevcima tlačnog lijeva. U eksperimentalnom dijelu, prije simulacije konstruiran je uljevni sustav s sustavom preljeva. Nakon toga slijedi konstruiranje kalupa koji će se koristiti za simulaciju. Slijedi, provedba simulacije u programskom paketu MAGMAsoft za odabrane parametre procesa lijevanja modela poklopca od AlSi9Cu3 legure. Nakon izvršene simulacije, prikazani su i opisani rezultati simulacija. Točnije, dan je opis i prikaz rezultata punjenja kalupne šupljine, zarobljenog zraka u kalupnoj šupljini, zračne poroznosti i poroznosti skupljanja, te ukupne poroznosti u odljevku. Naposljetku je napravljena analiza i usporedba poroznosti iz rezultata dobivenih simulacijom sa stvarnim stanjem poroznosti odljevaka sa snimki rendgena te nakon strojne obrade obrade odljevka.

Abstract (english)

This paper describes the technology of high pressure die casting (HPDC). After that, the process parameters that directly affect on the casting process and the properties of the casting are described. In addition, the procedure for obtaining the parameters is described. Molds for HPDC, the classification of molds, their basic parts and the materials from which they are made are described. This is followed by a section on the most common aluminum alloys used in HPDC process, especially the AlSi9Cu3 alloy that was used to make the casting on which the test were performed. A description is given of the melting furnace, more precisely the gas furnace for melting aluminum alloys, which was used to produce the melt in the observed process, which is described subsequently in the experimental part. Porosity is also described as one of the most common problems that appear in die castings. In the experimental part, before the simulation, an gating system with an overflow system was designed. This is followed by the design of the mould that will be used for the simulation. The following is the implementation of the simulation in the MAGMAsoft software package for the selected parameters of the HPDC process of the AlSi9Cu3 alloy cover model. After the simulation, results are presented and described. More specifically, a description and presentation of the results of filling the mold cavity, trapped air in the mold cavity, air porosity and shrinkage porosity, and total porosity on the casting is given. Finally, an analysis and comparison of porosity was made from the results obtained by simulation with the real state of the porosity of the castings from the X-ray images and after machining of the casting.

• Keywords: tlačni lijev; parametri; kalupi za tlačni lijev; poroznost; simulacija; MAGMAsoft
• Keywords (english): high pressure die casting (HPDC); parameters; molds for HDCP; porosity; simulation; MAGMAsoft
• Language: croatian
• URN:NBN: urn:nbn:hr:235:380490
• 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: Embargoed access; Embargo expiration date: 2028-12-07
• Created on: 2023-12-11 08:54:54