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1.
Konstruiranje in izdelava ščipalnih klešč za les
Peter Fajs, 2016, diplomsko delo

Opis: Pri obstoječi konstrukciji ščipalnih klešč za podiranje hlodovine do premera 18 cm smo se srečevali s problemom odstopanja rezila in krakov klešč od vodoravnega položaja. Posledično je bila povečana možnost poškodb klešč zaradi vstopa tujkov v rezalno območje. S spremembo obstoječe konstrukcije in izboljšanjem težišča smo problem odpravili. V diplomskem delu sta opisani obstoječa in posodobljena konstrukcija ter njune medsebojne spremembe. Izveden je trdnostni preračun najbolj obremenjenih elementov in opisan postopek priprave programa za laserski in plazemski razrez pločevine. Rezultati potrjujejo ustreznost nove konstrukcije in nosilnih elementov ščipalnih klešč za les.
Ključne besede: konstruiranje, ščipalne klešče za les, razrez pločevine, metoda končnih elementov
Objavljeno: 19.09.2016; Ogledov: 553; Prenosov: 82
.pdf Celotno besedilo (3,09 MB)

2.
INJECTION MOULDING PROCESS OPTIMIZATION OF CITRUS FIBER BIOCOMPOSITES BY SIMULATIONS AND TAGUCHI EXPERIMENTAL DESIGN
Peter Fajs, 2019, magistrsko delo

Opis: The objective of the master thesis is to determine the filling properties of injection moulding process for newly created material, and to understand how the variation of processing parameters affects the flow possibilities. In thesis two materials were analysed, i.e. neat PLA material, which was used as a benchmark material and newly created composite CitrusPLA that is based on biodegradable PLA matrix and reinforced with citrus fibres. To fulfil the aim, the virtual and experimental design of experiment with the Taguchi methodology was conducted with use of spiral flow test, where the flow length of material through mould cavity was observed. The experimental results were the basis for the accuracy validation of numerical results and also to determine the optimum process parameters for injection moulding products with best flow conditions through statistical evaluation. It has been concluded that the newly created composite has lower viscosity compared to benchmark virgin PLA which results in better flow conditions in spiral flow test analysis. Both materials have the same optimal conditions in terms of flow conditions. The contribution of mould temperature is in both cases negligible. However, other two variated parameters i.e. melt temperature and injection speed have higher influence on filling characteristics for both materials.
Ključne besede: injection moulding optimization, material characterization, Moldflow, injection moulding simulations, Taguchi DOE, bio-composites, citrus waste fibres, PLA
Objavljeno: 07.06.2019; Ogledov: 133; Prenosov: 0

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