고기능성 FDM 필라멘트를 이용한 자동차 서모스탯 하우징 부품의 치수평가

초록

In this study, the applicability of FDM(Fused Deposition Modeling)-based heat-resistant composites in under-hood environments was evaluated by comparing the dimensional stability of automotive thermostat housings fabricated using PAHT-CF, PPS-CF, PET-CF, and PA12-CF materials. The components were 3D scanned, reverse engineered, and assessed at the part level before and after 4 h of isothermal exposure at 135℃ and 155 . A scan-to-CAD ℃ comparison was performed using global best-fit alignment, and all filaments were predried at 100℃ for 8 h prior to printing. Under the as-printed conditions, PAHT-CF and PPS-CF exhibited low root-mean-squared error values and high tolerance compliance. After thermal exposure, PPS-CF exhibited the smallest dimensional change, followed by PAHT-CF. In contrast, PET-CF and PA12-CF exhibited increased deviation and reduced tolerance compliance. Consequently, PPS-CF and PAHT-CF were identified as promising candidate materials for engine compartment applications, whereas PET-CF and PA12-CF exhibited limited dimensional stability at elevated temperatures. The proposed approach enables the rapid screening of part-level dimensional stability and supports material and process selection.

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