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Expanding the applicability of material jetting–printed photopolymer prototype injection moulds by gamma irradiation post-treatment

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Názov: Expanding the applicability of material jetting–printed photopolymer prototype injection moulds by gamma irradiation post-treatment
Autori: Krizsma, Szabolcs, Mészáros, László, Kovács, Norbert Krisztián, Suplicz, András
Zdroj: Journal of Manufacturing Processes. 134:135-145
Informácie o vydavateľovi: Elsevier BV, 2025.
Rok vydania: 2025
Predmety: TJ Mechanical engineering and machinery / gépészmérnöki tudományok
Popis: Additive manufacturing (AM) revolutionized modern production and tooling, as it can help speed up the development process. This is also true for injection moulding. For instance, polymeric low-volume injection moulds are easy to produce by material jetting (MJ) technologies like PolyJet™. The downside of these MJ printed moulds is their relatively low glass transition temperature, which can result in unacceptably low stiffness and increased creep compliance in the operational temperature range. Different post-curing techniques like high-energy irradiation can enhance the degree of cross-linking in MJ-printed photopolymer parts. We applied MJ (PolyJet™ technology) to produce specimens for mechanical and morphological characterizations and low-volume injection moulds. After printing, we subjected the specimens and the inserts to high-energy gamma irradiation with doses of 50 kGy, 100 kGy, 150 kGy and 200 kGy. Dynamic mechanical analysis (DMA) showed the effects of irradiation on material properties: the glass transition temperature of the photopolymer rose by almost 10 °C from 70.8 °C of the untreated insert to 81.6 °C of the specimen irradiated with 200 kGy. The creep time temperature superposition (TTS) tests proved that the increasing irradiation doses significantly reduced creep compliance, which resulted in considerably lower mould insert deformations. Creep compliance measured at 35 °C fell from 1920 μm2/N of the untreated specimen to 518 μm2/N of the specimen irradiated with 200 kGy. After the material tests, we applied an elaborated comprehensive state monitoring system (operational strain, cavity pressure and temperature measurements) to highlight the fundamental effect that the irradiation has on the operational behaviour of the MJ-printed mould inserts. Injection moulding tests showed that the increasing irradiation doses resulted in significantly decreased operational deformations. Maximal operational strain of the mould inserts fell from 1 % measured on the untreated (0 kGy) insert to 0.5 % measured ...
Druh dokumentu: Article
Popis súboru: text
Jazyk: English
ISSN: 1526-6125
DOI: 10.1016/j.jmapro.2024.12.037
Rights: CC BY
Prístupové číslo: edsair.doi.dedup.....6f003fcdc63f7a37781e341d0c47d1fc
Databáza: OpenAIRE
Popis
Abstrakt:Additive manufacturing (AM) revolutionized modern production and tooling, as it can help speed up the development process. This is also true for injection moulding. For instance, polymeric low-volume injection moulds are easy to produce by material jetting (MJ) technologies like PolyJet™. The downside of these MJ printed moulds is their relatively low glass transition temperature, which can result in unacceptably low stiffness and increased creep compliance in the operational temperature range. Different post-curing techniques like high-energy irradiation can enhance the degree of cross-linking in MJ-printed photopolymer parts. We applied MJ (PolyJet™ technology) to produce specimens for mechanical and morphological characterizations and low-volume injection moulds. After printing, we subjected the specimens and the inserts to high-energy gamma irradiation with doses of 50 kGy, 100 kGy, 150 kGy and 200 kGy. Dynamic mechanical analysis (DMA) showed the effects of irradiation on material properties: the glass transition temperature of the photopolymer rose by almost 10 °C from 70.8 °C of the untreated insert to 81.6 °C of the specimen irradiated with 200 kGy. The creep time temperature superposition (TTS) tests proved that the increasing irradiation doses significantly reduced creep compliance, which resulted in considerably lower mould insert deformations. Creep compliance measured at 35 °C fell from 1920 μm2/N of the untreated specimen to 518 μm2/N of the specimen irradiated with 200 kGy. After the material tests, we applied an elaborated comprehensive state monitoring system (operational strain, cavity pressure and temperature measurements) to highlight the fundamental effect that the irradiation has on the operational behaviour of the MJ-printed mould inserts. Injection moulding tests showed that the increasing irradiation doses resulted in significantly decreased operational deformations. Maximal operational strain of the mould inserts fell from 1 % measured on the untreated (0 kGy) insert to 0.5 % measured ...
ISSN:15266125
DOI:10.1016/j.jmapro.2024.12.037