• 제목/요약/키워드: Rib Moldings

검색결과 2건 처리시간 0.013초

섬유강화 플라스틱 복합재료의 압축성형에서 리브 성형품의 휨에 미치는 성형조건의 영향 (Effects of Molding Conditions on the Deflection of Rib Moldings of Fiber-reinforced Plastic Composites in Compression Molding)

  • 김진우;이정훈;이동기
    • 공학기술논문지
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    • 제10권3호
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    • pp.285-290
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    • 2017
  • Molding of body with ribs is the most difficult during flow molding process. The rib area is easy to be deformed at the rear side due to wall thickness variation. In this study, relationships between molding condition and deflection of rib-shaped part is investigated during the compression molding of fiber reinforced plastic composites, and the following results are derived. Polypropylene(PP), Polystyrene(PS), and stampable sheet(SS 40wt%) show the increment of deflection along with releasing temperature. For the correlation between incremental holding pressure load and deflection, stampable sheet exhibits lower deflection along with higher holding pressure, while PS shows significant increase of deflection with higher holding pressure, PP shows completely different characteristic, significant reduction of deflection along with higher holding pressure. Regarding to mold temperature and deflection, deflection amount of SS is the biggest, and PS shows the smallest. In addition, all three kinds shows the highest amount of deflection at 173C. Deflection is reduced when mold closing speed is increased. Amount of deflection in SS is larger and is not highly dependent on molding conditions like holding pressure and cooling parameters, compared with single component material like PP. This can be elucidated by anisotropic and inhomogeneous characteristics of glass fiber during filling process of stampable sheet composite.

무도장 적용 사출금형의 리브 Sink에 관한 연구 (A Study on rib sink-marks of injection mold for unpainted parts)

  • 노영수;임재규;류호연;이희진;황시현
    • Design & Manufacturing
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    • 제10권1호
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    • pp.7-11
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    • 2016
  • Sinks occurring in the rib portion of the testing product for the unpainteds are fatal defects at surface quality. In this study, we carried out moldflow analyses for several factors that affect the sinks. The result tells us large important effective factors on sinks by analyzing sink marks estimate. We expect practical use as reference for performing analysis or manufacturing products with rib designs and injection moldings which minimize sink-marks surrounded ribs.