A study on the mold opening stroke according to the control method of the injection molding machine

사출성형기의 속도제어 방식에 따른 형개거리에 관한 연구

  • Jung, Hyun-Suk (Department of Semiconductor Quality Measurement Division, Semiconductor Convergence Campus of Korea Polytechnic colleges) ;
  • Lee, Chun-Kyu (Department of Metal Mold Design Engineering, Kongju National University)
  • 정현석 (한국폴리텍대학 반도체융합캠퍼스 반도체품질측정과) ;
  • 이춘규 (공주대학교 금형설계공학과)
  • Received : 2021.09.13
  • Accepted : 2021.09.30
  • Published : 2021.09.30

Abstract

The increase in automation facilities in the injection molding industry is a very important process control item. The most important item when constructing an unmanned machine using a take-out robot is the "mold opening stroke" of the mold. The injection molding machine control method is divided into hydraulic type and electric type, and there have been few studies on the mold opening distance according to the control method. In this study, the correlation was confirmed by increasing the injection speed to 20, 50, 80, and 100% for the three types of hydraulic control method, open loop and close loop, and electric control method. Through the experiment, the following results were obtained. (1) It can be seen that the reproducibility is excellent with the electric, close loop, and open loop control methods. (2) When the injection speed is set to 50%, the mold opening distance is 263.10~263.27 mm, which is the most reproducible. (3) As a result of ANOVA, both injection speed and mold opening distance showed a significant difference in the hydraulic control method (p<0.05), but it was verified through experiments that there was no significant difference in the electric control method. Based on these results, when electric control is selected rather than hydraulic control, the reproducibility of the mold opening distance is excellent, so it is thought that the taking-out robot can take the object out of the mold more safely.

Keywords

References

  1. Kim, S. K. "Status and innovation plan of manufacturing technology in plastics engineering focusing on thermoplastics, composites and molds", Journal of the Korea Society of Die & Mold Engineering, Vol.15 No.2, pp. 1-10, 2021.
  2. Jung, H. S, and Yoo, J. H, "Mold Opening Stroke according to Injection Speed", ICMTE, p. 254, 2011.
  3. Jung, H. S, and Yoo, J. H, "An Experimental Study on the Measurement Performance of Injection molding machine", Journalof the KSMTE, pp. 134-135, 2011.
  4. Jung, H. S, and Yoo, J. H, "Tie bar Elongation Test of Toggle type Injection Molding Machine", Journalof the KSMTE., Vol.21, No.4 pp. 672-676, 2013.
  5. B. K. Choi, and D. G. Lee, "A Study on the Process Capability Analysis of MIM Product", Journal of the Korea Society of Machine Tool Engineers, Vol. 19, No. 1, pp. 57-64, 2010.
  6. Hong, C. M. and Jung, H. S., "Melting Plastic Mixing and Product Density Based on Screw Shape", Journal of Korean Society of Manufacturing Technology Engineers, Vol. 28, pp. 100-105, 2019. https://doi.org/10.7735/ksmte.2019.28.2.100
  7. Shine, K. H. and Kim, M. A., "Development of high performance and efficiency plastic axial fan by proximity cooling mold to minimize warpage", Korea Society of Die & Mold Engineering, Vol. 13, No.1, pp. 61-67, 2019.