Primjena aditivne proizvodnje za izradu rešetkastih pramodela za klasične postupke lijevanja metala

master's thesis

• Title (english): Application of additive manufacturing in production of lattice patterns for classical metal casting
• Author: Roman Fraj-Sladoljev
• Mentor: Ana Pilipović (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

Ovim diplomskim radom potvrdila se mogućnost primjene aditivne tehnologije, odnosno postupka taložnog očvršćivanja (FDM) za izradu odljevaka složenih ćelijastih struktura. Analizirani su parametri i izvedivost svakog koraka procesa, od modeliranja pramodela do završnog lijevanja metala u izrađeni kalup. Struktura pramodela modelirana je u softveru nTopology, dodatni elementi u softveru Solidworks te optimiranje modela za izradu postupkom FDM u programu za pripremu Orcaslicer. Ovakvim pristupom omogućila se kontrola svakog koraka izrade pramodela te njegovo optimiranje. Povoljna svojstva materijala Polycast, uz optimiranje postupka osigurali su izradu složenih geometrija uz minimalnu potrebu za potpornim strukturama. Eksperimentalno su testirana tri pristupa kalupljenju: gipsani kalup te keramičke školjke na bazi natrijevog silikata i koloidne silike. Gipsani kalup, iako ekonomičan i prikladan za lijevanje legura s nižim talištem kao što je cinkova legura ZAMAK 410, nije se pokazao pogodnim. Veća postojanost pri visokim temperaturama keramičkih školjki omogućila je uspješnu provedbu postupka žarenja, izgaranja pramodela te lijevanja.

Abstract (english)

This thesis confirmed the potential application of additive manufacturing, specifically the Fused Deposition Modeling (FDM) process, for the production of metal castings with complex cellular structures. The parameters and feasibility of each step in the process were analyzed, from modeling the pattern to the final metal casting in the produced mold. The structure of the pattern was modeled in the nTopology software, additional elements were designed in SolidWorks, and the model was optimized for FDM production in the preparation program Orcaslicer. This approach enabled control over every step of the pattern production and it's optimization. The favorable properties of the Polycast material, combined with process optimization, ensured the creation of complex geometries with minimal need for support structures. Three approaches to molding were experimentally tested: plaster molds and ceramic shells based on sodium silicate and colloidal silica. While the plaster mold proved economical and suitable for casting low-melting-point alloys such as the zinc alloy ZAMAK 410, it was found to be unsuitable for this application. The higher temperature resistance of ceramic shells allowed for the successful execution of the burnout process, sintering of the ceramic shell and casting.

• Keywords: ćelijasta struktura; keramička školjka; Polycast; taložno očvršćivanje; točni lijev; cinkova legura
• Keywords (english): lattice structure; ceramic shell; Polycast; fused deposition modeling; investment casting; zinc alloy
• Language: croatian
• URN:NBN: urn:nbn:hr:235:571727
• 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: 2025-02-02 22:09:01