정밀 의료기기 부품 생산을 위한 사출금형의 가스벤트 제어에 관한 연구
A study on gas vent control of injection mold for the production of precision medical device parts
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초록
Typical characteristics of medical device parts are that they can not be reused and there are many disposable products. Therefore, there is a need for an injection molding machine having excellent repeatability of molding conditions and a precision injection mold for mass production. Recently, the performance of an injection machine has made a remarkable evolution compared to the past. However, defects such as short-shot, flash, weld line, gas burning, warpage, and deformation, which are typical defects, still do not disappear at all. This is due to the lack of gas ventilation from the product cavities, even if the gas is smoothly vented from the sprue and runner of the mold. For this reason, the internal pressure of the cavity rises and is directly connected to the quality defects. In this study, an active gas vent system was designed to prevent defects due to trapped gas in the cavity. Since it can be easily adjustable in response to the molding conditions and the mold temperature changes, it is expected to improve productivity due to the reduction of the defective ratio.
Abstract
Typical characteristics of medical device parts are that they can not be reused and there are many disposable products. Therefore, there is a need for an injection molding machine having excellent repeatability of molding conditions and a precision injection mold for mass production. Recently, the performance of an injection machine has made a remarkable evolution compared to the past. However, defects such as short-shot, flash, weld line, gas burning, warpage, and deformation, which are typical defects, still do not disappear at all. This is due to the lack of gas ventilation from the product cavities, even if the gas is smoothly vented from the sprue and runner of the mold. For this reason, the internal pressure of the cavity rises and is directly connected to the quality defects. In this study, an active gas vent system was designed to prevent defects due to trapped gas in the cavity. Since it can be easily adjustable in response to the molding conditions and the mold temperature changes, it is expected to improve productivity due to the reduction of the defective ratio.
참고문헌 (6)
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- Finite Element Analysis for Flow Marks in Injection Molding, "S. M. Ki", KSAE, 61~65 (2013)
- Korea Plastics Technology Information Center, "The Series of Book for Entrance to a Plastics Industry" (2002)
- Development of the monitoring methods of the venting hole clogging in injection mold, "B. J. Kim", The Korean Society of Manufacturing Technology Engineers, ~ (2019)
- D. G. Shin, "A Study on the monitoring technique for the venting defect in injection molding", Master, pp.2017