Research of tribological mechanisms influence on lifetime of mould for high pressure die casting

U ovom radu opisan je postupak visokotlačnog lijevanja aluminijskih legura. Razjašnjene su popratne tehnologije te utjecajni parametri na trošenje površine kalupa. Trošenje kalupa raščlanjeno je na osnovne tribološke mehanizme trošenja. Mehanizmi trošenja su analizirani pojedinačno te je istraženo njihovo međudjelovanje. Analizirana je većina ranijih istraživanja na ovom području. Na temelju dosadašnjih saznanja i parametara procesa visokotlačnog lijevanja aluminijskih legura dizajniran je i izrađen prototip laboratorijskog uređaja za simulaciju trošenja kalupa za visokotlačno lijevanje. Određen je utjecaj najvažnijih parametara na ukupno trošenje kalupa. U ovom radu prikazan je utjecaj toplinske obrade, površinske zaštite, temperature predgrijavanja kalupa i brzine strujanja taline. Uz to, analizirane su metode popravka mogućih oštećenja. Ovaj rad izrađen je u sklopu projekta pod nazivom „ Optimiranje i modeliranje termalnih procesa materijala “ (oznaka projekta 5371) Hrvatske zaklade za znanost.This paper describes the process of high pressure casting of aluminium alloys. Supporting technologies and influential parameters on the wear of the mould surface have been clarified. The mould wear was separated into basic tribological mechanisms of wear and they were also individually analysed. Their interaction was also explored. Most of the previous researches in this area have been analysed. Based on the current knowledge and parameters of the process of high-pressure casting of aluminium alloys, a prototype of a surface wear simulation laboratory device has been designed and developed. The effect of the main influential parameters on total wear of the mould surface was determined. This thesis describes the effect of: heat treatment, surface protection, mould preheating temperature and molten metal velocity. In addition to this study, most common methods of damage repair have been analysed. This work has been fully supported by Croatian Science Foundation under the project “Optimisation and modelling of thermal processes of materials“ (project 5371)