20.500.12556/DKUM-83054 Vpliv parametrov procesa brizganja na zaostale napetosti in nastanek razpok pri več-komponentnih prozornih izdelkih iz pmma diplomsko delo Influence of injection molding process parameters on residual stresses and crack formation in transparent multicomponent pmma products Pokrove za zadnje avtomobilske luči izdelamo z brizganjem plastičnih mas. Kakovost izdelkov nadzorujemo in zagotavljamo s spreminjanjem procesnih parametrov. Velik vpliv na spreminjanje kakovosti izdelkov med uporabo imajo zaostale napetosti, ki se pojavijo med njihovim ohlajanjem. Pomembno je, da visoke zaostale napetosti na izdelkih pravočasno odkrijemo, sicer se lahko zaradi njih, v času uporabe izdelka, na izdelkih pojavijo razpoke. Pri izvedbi eksperimenta nas je zanimalo, kako se s spreminjanjem procesnih parametrov spreminja nastanek razpok na izdelkih. Pokrove smo izpostavili tekočemu etanolu in pregledovali nastale razpoke. Nastanek razpok na pokrovih smo preprečili z brizganjem pri nižjem naknadnem tlaku in krajšem času delovanja naknadnega tlaka. The tail light covers for cars are injection molded from plastic. We control and ensure the product quality by changing the process parameters. Residual stresses that occur during cooling have a great impact on the quality of the products in use. It is important to detect excessive residual stresses on the products in time, otherwise cracks may appear on the product during use. In conducting the experiment, we were interested in how the cracking of the products changes when the process parameters are changed. The taillight covers were exposed to ethanol, and the resulting cracks were studied. Cracking of the covers was prevented by injection molding with a lower holding pressure and a shorter holding pressure time. PMMA plastične mase brizganje plastičnih mas zaostale napetosti nastanek razpok PMMA plastics injection molding residual stresses crack formation true true false [K. Jernejšek] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2022-09-14 16:36:26 2024-03-05 10:20:21 2024-03-26 03:15:24 0000-00-00 00:00:00 2022 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (XI, 48 f., [3] f. pril.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 678.027.74.01(043.2) 190160131 UN_Jernejsek_Katja_2022.pdf UN_Jernejsek_Katja_2022.pdf 1 0E9E35D592822803DDA5279D1555BC79 e65ad7526fa851c643ac13c2c799cdbdee3dad936c66f65afd205184f0de10d9 def56d94-4338-11ed-97f7-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=163710 Fakulteta za strojništvo 0 0 0