Izdelava prototipa kalupa za brizganje plastičnega nosilca balkonske talne obloge

Ješić, Jovan (author), Pušavec, Franci (mentor), Pepelnjak, Tomaž (comentor)

Diplomsko delo obravnava razvoj plastičnega nosilca balkonske talne obloge in prototipnega postopka za preverjanje njegove izdelovalnosti. Geometrija nosilca je bila razvita v okolju CAD in prilagojena prototipni izdelavi ter morebitnemu poznejšemu injekcijskemu brizganju. Najprej je bil na lastnem triosnem CNC-stroju izdelan togi dvodelni HDF-kalup, pri katerem se je pri ulivanju poliuretana pokazala nezanesljivost razkalupljanja kompleksne mrežaste geometrije. Postopek je bil zato spremenjen: iz PP (polipropilen)-plošče je bil CNC-obdelan pozitivni glavni model, okoli njega pa ročno ulit dvokomponentni silikonski kalup. V ta kalup je bil nato gravitacijsko ulit dvokomponentni poliuretanski sistem NEUKADUR ProtoFlex 190-05. Končni prototip je dosegel mere približno 98,60 × 99,00 × 10,1 mm pri nazivnih merah 100,00 × 100,00 × 10,00 mm. Pri večkratnem praktičnem nestandardiziranem obremenjevanju PU-prototipa z maso približno 75 kg ni bilo vidnih razpok ali loma. Ločeno je bil praktično preverjen tudi sestav dveh CNC-obdelanih PP modelov z lesenima letvicama. Rezultati potrjujejo uporabnost izbranega prototipnega pristopa za preverjanje geometrije in osnovne funkcije pred nadaljnjim razvojem industrijskega brizgalnega orodja

• Language: Slovenian
• Keywords: injekcijsko brizganje, plastični nosilec, prototipni kalup, silikonski kalup, poliuretanski elastomer, CNC-obdelava
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [J. Ješić]
• Year: 2026
• Number of pages: XX, 57 str.
• PID: 20.500.12556/RUL-186582
• UDC: 678.027.74:621.744(043.2)
• COBISS.SI-ID: 289852931
• Publication date in RUL: 03.09.2026

Secondary language

• Language: English
• Title: Development of a prototype injection mold for a plastic balcony decking support

Abstract

The thesis addresses the development of a plastic support for balcony decking and a prototype process for verifying its manufacturability. The support geometry was developed in CAD and adapted to prototype manufacturing and potential later injection molding. A rigid two-part HDF mold was first manufactured on a privately owned three-axis CNC machine. Casting polyurethane into this mold revealed unreliable demolding of the complex ribbed geometry. The process was therefore changed: a positive master pattern was CNC machined from a polypropylene plate, and a two-component silicone mold was manually gravity-cast around the master. A two-component NEUKADUR ProtoFlex 190-05 polyurethane system was then gravity-cast into the silicone mold. The final prototype measured approximately 98.60 × 99.00 × 10.1 mm compared with nominal dimensions of 100.00 × 100.00 × 10.00 mm. Repeated non-standard practical load checks of the PU prototype using a mass of approximately 75 kg produced no visible cracking or fracture. The assembly of two CNC-machined PP models with wooden slats was evaluated separately. The results support the use of the selected prototype route for geometry and basic functional verification before further development of an industrial injection-molding tool.

• Keywords: injection molding, plastic support, prototype mold, silicone mold, polyurethane elastomer, CNC machining