Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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An Experimental Study of In-Mold Coating of Automotive Armrests

자동차 암레스트의 인몰드코팅에 관한 실험적 연구

  • Park, Jong Rak (Dept. of Aeronautical & Mechanical Design Engineering, Korea Nat'l Univ. of Transportation) ;
  • Lee, Ho Sang (Dept. of Aeronautical & Mechanical Design Engineering, Korea Nat'l Univ. of Transportation)
  • 박종락 (한국교통대학교 항공.기계설계학과) ;
  • 이호상 (한국교통대학교 항공.기계설계학과)
  • Received : 2015.01.29
  • Accepted : 2015.05.04
  • Published : 2015.07.01
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Abstract

A mold design for in-mold coating was developed to achieve simultaneous coating and injection molding of an automotive armrest. The developed mold includes one core and two cavities which are composed of a substrate cavity and a coating cavity. The core was attached to a movable plate and two cavities were mounted on a plate sliding in a stationary plate. In a two-step process, the part was first injection molded and subsequently, with the aid of a sliding table, was transferred to a second cavity. The materials used were PC/ABS for substrate and two-component polyurethane for coating. The experiments were conducted by changing the flow rate to investigate mixing characteristics. As the flow rate increased, the mixing improved. Additionally, the bubbles appeared over the substrate surface decreased with an increase of the weight of injected coating material.

자동차 암레스트의 사출성형과 코팅을 동시에 구현하기 위하여 인몰드 코팅 금형을 설계하였다. 개발된 금형은 하나의 코어와 두개의 캐비티를 포함하고 있으며, 캐비티는 기재 캐비티와 코팅 캐비티로 이루어진다. 코어는 가동측 형판에 부착되었으며, 두개의 캐비티는 고정측 형판에서 슬라이딩하는 평판위에 설치되었다. 2 단계 공정으로 이루어지며 가장 먼저 사출성형된 제품은 슬라이딩 평판에 의하여 2 번째 캐비티로 전달되었다. 기재에 적용된 소재는 PC/ABS 이며, 코팅제로는 2 액형 폴리우레탄이 사용되었다. 코팅제의 토출유량을 변경하면서 실험을 수행하였으며, 주제와 경화제의 믹싱특성을 고찰하였다. 토출유량이 증가함에 따라 믹싱이 더욱 향상되었으며, 주입된 코팅제의 중량이 증가할수록 기재 표면에 발생하는 기포가 감소하였다.

Keywords

References

  1. Park, C. H., Ahn, H. J., Choi, D. H. and Pyo, B. G., 2010, "Two-stage Design Optimization of an Automotive Fog Blank Cover for Enhancing Its Injection Molding Quality," Trans. Korean Soc. Mech. Eng. A, Vol. 34, No. 8, pp.1097-1103. https://doi.org/10.3795/KSME-A.2010.34.8.1097
  2. Gruber, M., 2009, "Method for Producing a Coated Composite Component," KraussMaffei Technologies, US Patent, No. 0243148.
  3. Lee, H. S., Kim, D. M. and Yoo, Y.E., 2013, "A Study on the Curing Characteristics of Two-component Polyurethane During in-mold Coating Processes," Proc. KSMTE Conf., p. 103.
  4. Lee, H. S., Kim, D. M. and Park, J. R., 2013," Mold Design for Simultaneous Injection Molding and Surface Coating," Proc. KSTP Conf., pp.42-44.
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Cited by

  1. Experimental study on the processing conditions of in-mold coating for injection-molded plates vol.17, pp.10, 2016, https://doi.org/10.1007/s12541-016-0158-x