Development of µ-PIM standard mold with exchangable insert core in order to manufacture micro pattern

마이크로 패턴 성형을 위한 인서트 코어 적용 µ-PIM 표준금형 개발에 관한 연구

  • Received : 2017.10.27
  • Accepted : 2017.11.24
  • Published : 2017.12.01

Abstract

Increased demand for parts with micro-pattern structure made of metals, ceramics, and composites in various fields such as medical ultrasonic sensors, CT collimators, and ultra-small actuator parts. Micro powder injection molding (PIM) is a technology for manufacturing micro size, high volume, complex, precision, net-shape components from either metal or ceramic powder. In the present study, a standard mold with a variable insert core capable of producing various micro patterns was investigated. An injection molding test was performed on a standard mold using a line type micro-pattern core having an aspect ratio of 2, a slenderness ratio of 70, a pattern size of $200{\mu}m$, and a pattern spacing of $150{\mu}m$. During the filling process, the deformation of the mold with large aspect ratio and slenderness ratio was analyzed by the experiment and the numerical simulation according to the position of the gate. We proposed a mold structure that minimizes mold deformation by gate modification and enables uniform pattern filling behavior.

Keywords

References

  1. Nishiyabu, K., "Some Critical Issues for Injection Molding", IntechOpen, 2012.
  2. Piotter, V., Bauer, W., Benzler, T. and Emde, A., "Injection Molding of Components for Microsystems, Microsystem Technologies", Vol. 7, No. 3, pp. 99-102, 2001. https://doi.org/10.1007/s005420100094
  3. Yoo, Y.-E., et. al., "Injection Molding Tehcnology for Micro/Nano Pattern", Journal of the Korean Society for Precision Engineering, Vol. 22, No. 2, pp. 23-29, 2005.
  4. Heckele, M., Bacher, W. and Muller, K. D., "Hot Embossing - The Molding Technique for Plastic Microstructures", Microsystem Technologies, Vol. 4, No. 3, pp. 122-124, 1998. https://doi.org/10.1007/s005420050112
  5. Chou, S. Y., Krauss, P. R. and Renstorm, P. J., "Imprint of Sub-25nm Vias and Trenches in Polymers", Applied Physics Letters, Vol. 67, No. 21, pp. 3114-3116, 1995. https://doi.org/10.1063/1.114851
  6. Merz, L., et. al., "Powder Injection Molding of Metallic and Ceramic Microparts", Microsystem Technologies, Vol. 10, No. 3, pp. 202-204, 2004. https://doi.org/10.1007/s00542-003-0361-4
  7. Lowe, D. and Hauselt, J., "Microengineering of Metals and Ceramics", Wiley-VCH, 2005.
  8. German, R.M., Bose, A., "Injection molding of metals and ceramics", Metal Powder Industrial Federation, Princeton, NJ, 1997.
  9. Park, S. H., et. al., "Injection molding nicro patterns with high aspect ratio using a polymeric flexible stamper", eXPRESS Polymer Letters, Vol. 5., No. 11, pp. 950-958, 2011. https://doi.org/10.3144/expresspolymlett.2011.93
  10. 이봉기, 김영배, 권태현, "초소형사출성형 공정을 이용한 마이크로 구조 표면의 성형", 한국정밀공학회지, 제26권 9호, pp. 135-142, 2009.