Numerično napovedovanje oblike brizganih plastičnih izdelkov po zahtevnem izmetavanju

Krebelj, Kristjan (author), Štok, Boris (mentor), Mole, Nikolaj (comentor)

Razvit je pristop numerične simulacije brizganja plastike, pri katerem je cilj napovedati končno obliko izdelka, ki je odvisna tudi od faze izmetavanja. Modeliranje faz zapolnjevanja, naknadnega tlaka in ohlajanja je izvedeno kot problem računalniške dinamike tekočin. Zaostale napetosti v izdelku so modelirane kot problem mehanike trdnin z uporabo metode končnih elementov. Model vključuje reologijo trdnega polietilena visoke gostote. Simuliran je kontaktni problem izmetavanja in končno ohlajanje na sobno temperaturo.

• Language: Slovenian
• Keywords: brizganje plastike, izmetavanje, zaostale napetosti, skrček, napoved oblike, numerično modeliranje
• Work type: Doctoral dissertation
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2019
• PID: 20.500.12556/RUL-112816
• Publication date in RUL: 14.11.2019

Secondary language

• Language: English
• Title: Numerical prediction of injection molded product's shape after complex ejection

Abstract

A numerical simulation approach for plastics injection molding is developed where the goal is to predict the final shape of a product which is also affected by the ejection stage. The modeling of the filling, packing and cooling stages is conducted in the scope of computational fluid dynamics. The residual stresses in the part are predicted in the scope of solid mechanics using the finite element method. The model includes the rheology of solid high density polyethylene. The ejection contact problem and cooling to room temperature are simulated.

• Keywords: injection molding, ejection, residual stresses, shrinkage, shape prediction, numerical modeling