사출성형에서 공정 중 금형의 진동 크기 변화를 활용한 냉각시간 모니터링에 대한 연구
A study on the monitoring of cooling time using the change in the magnitude of mold vibration in injection molding
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In this study, during the injection molding process, a device was manufactured and evaluated that calculates a cooling time by measuring a vibration signal generated from a mold using an acceleration. The last two parts, one of which has a large magnitude change in the measured vibration signal of a mold, were divided into a cooling start section (paking end section) and a mold opening section, and the time difference at the relevant points was calculated as the cooling time. The cooling time was monitored on a 5-inch light guide plate mold by applying the method. The manufactured device was attached to a fixed base of mold to measure the cooling time, and data was obtained remotely using Bluetooth technology. Then, the measured cooling time was compared with the cooling time set in the injection molding machine to evaluate the accuracy. As a result of the experiment, the cooling times measured by the devices were 15.675±0.024 sec, 20.637±0.014 sec and 25.623±0.079 sec of each conditions. Also, the measurement results were shown with errors of 0.655±0.044 sec, 0.637±0.014 sec, and 0.662±0.013 sec, respectively.
Abstract
In this study, during the injection molding process, a device was manufactured and evaluated that calculates a cooling time by measuring a vibration signal generated from a mold using an acceleration. The last two parts, one of which has a large magnitude change in the measured vibration signal of a mold, were divided into a cooling start section (paking end section) and a mold opening section, and the time difference at the relevant points was calculated as the cooling time. The cooling time was monitored on a 5-inch light guide plate mold by applying the method. The manufactured device was attached to a fixed base of mold to measure the cooling time, and data was obtained remotely using Bluetooth technology. Then, the measured cooling time was compared with the cooling time set in the injection molding machine to evaluate the accuracy. As a result of the experiment, the cooling times measured by the devices were 15.675±0.024 sec, 20.637±0.014 sec and 25.623±0.079 sec of each conditions. Also, the measurement results were shown with errors of 0.655±0.044 sec, 0.637±0.014 sec, and 0.662±0.013 sec, respectively.
참고문헌 (6)
- Hassan, H, "An experimental work on the effect of injection molding parameters on the cavity pressure and product weight", Int. J. Adv. Manuf. Technol, 67, pp.675~686 (2013)
- 노건철, "사출 성형 시 수지온도와 웰드품질과의 관계", Design & Manufacturing, 9(1), pp.27~30 (2015), 한국금형공학회
- Mun, Y. B., "Effects of holding pressure affecting cooling time in injection molding", IJ. D&M Eng., 2(1), pp.39~43 (2008)
- Hwang, S. H, "A study on the cooling analysis of plastic products with high aspect ratio", J. D&M Eng., 2(2), pp.6~9 (2008)
- Chen, J. Y., "Online quality monitoring of molten resin in injection molding", Int. J. Heat Mass Transfer, 122, pp.681~693 (2018)
- 이준한, "사출성형공정에서 금형에 전달되는 진동 신호 측정을 이용한 성형 단계별 공정시간과 공정특성의 모니터링에 대한 연구", Design & Manufacturing, 14(3), pp.8~16 (2020), 한국금형공학회[DOI]