Usage of reverse engineering for deformation analysis and corrections of plastic injection molding tool

Diplomska naloga je sestavljena iz uvodnega poglavja, kjer je predstavljen proces brizganja plastike od granulata do končnega izdelka. V tem delu so omenjeni tudi parametri predelave, ki vplivajo na kakovost končnega izdelka, in napake, ki se pojavijo med procesom. V glavnem delu naloge je obravnavan plastičen izdelek, ki je narejen s postopkom injekcijskega brizganja. Po ciklu brizganja nastopi faza hlajenja, kjer pri izdelku prihaja do nezaželenih deformacij, ki negativno vplivajo na kakovost izdelka. Praktičnega dela naloge smo se lotili tako, da smo na začetku deformiran izdelek poskenirali in prenesli v digitalni zapis. Ko smo imeli model v digitalni obliki, smo lahko izvedli analizo in ga primerjali z referenčnim CAD-modelom. Izvedli smo še računalniško simulacijo z uporabo enakih parametrov, kot se uporabljajo pri izdelavi izdelka. Na podlagi primerjanih rezultatov iz obeh analiz smo izbrali bolj primerno, določili kritična mesta in predstavili ugotovitve. Iz dobljenih rezultatov se je na kritičnem mestu izvedla korekcija orodja, in sicer tako, da smo en segment vložka zamenjali z novo izdelanim, ki je imel ustrezne dimenzije.The diploma thesis consists of an introductory chapter, which presents the process of polymer injection molding from feedstock to the final product. This section also mentions the processing parameters that affect the quality of the final product and defects that occur during this process. The main part of the assignment relates to a plastic product made by the injection molding process. After the injection molding cycle, the cooling phase begins, where unwanted deformations occur, which negatively affects the quality of the product. We tackled the practical task by scanning the initially deformed product and transfer it to the digital format. Once we had the model in digital format, we were able to analyze it and compare it to reference CAD-models. We also performed a computer simulation using equivalent parameters used to fabricate the product. Based on the compared results from both analysis, we selected the more appropriate ones, identified critical locations, and presented the findings. From the obtained results, a tool correction was performed at a critical point by segmenting the insert, which was replaced by another insert that had the appropriate dimensions